PIC16LF1509 [MICROCHIP]
20-Pin Flash, 8-Bit Microcontrollers with XLP Technology;![PIC16LF1509](http://pdffile.icpdf.com/pdf2/p00336/img/icpdf/PIC16LF1507_2067272_icpdf.jpg)
型号: | PIC16LF1509 |
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描述: | 20-Pin Flash, 8-Bit Microcontrollers with XLP Technology 微控制器 |
文件: | 总422页 (文件大小:7157K) |
中文: | 中文翻译 | 下载: | 下载PDF数据表文档文件 |
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PIC16(L)F1508/9
20-Pin Flash, 8-Bit Microcontrollers with XLP Technology
High-Performance RISC CPU:
• C Compiler Optimized Architecture
• Only 49 Instructions
• Up to 8 Kwords Linear Program Memory
Addressing
• Up to 512 bytes Linear Data Memory Addressing
• Operating Speed:
Extreme Low-Power Management
with XLP (PIC16LF1508/9):
• Standby Current:
- 20 nA @ 1.8V, typical
• Watchdog Timer Current:
- 260 nA @ 1.8V, typical
• Operating Current:
- 30 A/MHz @ 1.8V, typical
• Secondary Oscillator Current:
- 700 nA @ 32 kHz, 1.8V, typical
- DC – 20 MHz clock input
- DC – 200 ns instruction cycle
• Interrupt Capability with Automatic Context
Saving
• 16-Level Deep Hardware Stack with Optional
Overflow/Underflow Reset
Peripheral Features:
• Direct, Indirect and Relative Addressing modes:
- Two full 16-bit File Select Registers (FSRs)
- FSRs can read program and data memory
•
Analog-to-Digital Converter (ADC):
- 10-bit resolution
- 12 external channels
- 3 internal channels:
- Fixed Voltage Reference
Flexible Oscillator Structure:
• 16 MHz Internal Oscillator Block:
- Factory calibrated to ±1%, typical
- Software selectable frequency range from
16 MHz to 31 kHz
- Digital-to-Analog Converter (DAC)
- Temperature Indicator channel
- Auto acquisition capability
- Conversion available during Sleep
• 31 kHz Low-Power Internal Oscillator
• Three External Clock modes up to 20 MHz
• 5-Bit Digital-to-Analog Converter (DAC):
- Output available externally
- Positive reference selection
Special Microcontroller Features:
- Internal connections to comparators and
ADC
• Operating Voltage Range:
- 1.8V to 3.6V (PIC16LF1508/9)
- 2.3V to 5.5V (PIC16F1508/9)
• Self-Programmable under Software Control
• Power-On Reset (POR)
• 2 Comparators:
- Rail-to-rail inputs
- Power mode control
- Software controllable hysteresis
• Voltage Reference module:
- Fixed Voltage Reference (FVR) with 1.024V,
2.048V and 4.096V output levels
- 1 rail-to-rail resistive 5-bit DAC with positive
reference selection
• 18 I/O Pins (1 Input-only Pin):
- High current sink/source 25 mA/25 mA
- Individually programmable weak pull-ups
- Individually programmable
• Power-up Timer (PWRT)
• Programmable Low-Power Brown-Out Reset
(LPBOR)
• Extended Watchdog Timer (WDT):
- Programmable period from 1 ms to 256s
• Programmable Code Protection
• In-Circuit Serial Programming™ (ICSP™) via Two
Pins
• Enhanced Low-Voltage Programming (LVP)
• In-Circuit Debug (ICD) via Two Pins
• Power-Saving Sleep mode:
Interrupt-On-Change (IOC) pins
• Timer0: 8-Bit Timer/Counter with 8-Bit
Programmable Prescaler
- Low-Power Sleep mode
- Low-Power BOR (LPBOR)
• Enhanced Timer1:
- 16-bit timer/counter with prescaler
- External Gate Input mode
• Timer2: 8-Bit Timer/Counter with 8-Bit Period
Register, Prescaler and Postscaler
• Four 10-bit PWM modules
• Integrated Temperature Indicator
• 128 Bytes High-Endurance Flash
- 100,000 write Flash endurance (minimum)
2011-2013 Microchip Technology Inc.
DS40001609B-page 1
PIC16(L)F1508/9
• Numerically Controlled Oscillator (NCO):
- 20-bit accumulator
- 16-bit increment
- True linear frequency control
- High-speed clock input
Peripheral Features (Continued):
• Master Synchronous Serial Port (MSSP) with SPI
and I2C™ with:
- 7-bit address masking
- SMBus/PMBus™ compatibility
• Enhanced Universal Synchronous Asynchronous
Receiver Transmitter (EUSART)
- RS-232, RS-485 and LIN compatible
- Auto-Baud Detect
- Selectable Output modes
- Fixed Duty Cycle (FDC) mode
- Pulse Frequency (PF) mode
• Complementary Waveform Generator (CWG):
- 8 selectable signal sources
- Selectable falling and rising edge dead-band
control
- Polarity control
- 4 auto-shutdown sources
- Multiple input sources: PWM, CLC, NCO
- Auto-wake-up on Start
• 4 Configurable Logic Cell (CLC) modules:
- 16 selectable input source signals
- Four inputs per module
- Software control of combinational/sequential
logic/state/clock functions
- AND/OR/XOR/D Flop/D Latch/SR/JK
- Inputs from external and internal sources
- Output available to pins and peripherals
- Operation while in Sleep
PIC12(L)F1501/PIC16(L)F150X FAMILY TYPES
Device
PIC12(L)F1501 (1) 1024 64
6
4
8
1
2
1
1
2/1
2/1
2/1
2/1
2/1
4
4
4
4
4
—
—
—
1
—
1
1
1
1
1
1
2
2
2
4
4
1
1
1
1
1
H
H
—
—
—
Y
PIC16(L)F1503 (2) 2048 128 12
PIC16(L)F1507 (3) 2048 128 18 12
PIC16(L)F1508 (4) 4096 256 18 12
PIC16(L)F1509 (4) 8192 512 18 12
—
2
—
1
—
1
H
I/H
I/H
2
1
1
1
Y
Note 1: Debugging Methods: (I) – Integrated on Chip; (H) – using Debug Header; E – using Emulation Header.
2: One pin is input-only.
Data Sheet Index: (Unshaded devices are described in this document.)
1: DS41615
2: DS41607
3: DS41586
4: DS40001609
PIC12(L)F1501 Data Sheet, 8-Pin Flash, 8-bit Microcontrollers.
PIC16(L)F1503 Data Sheet, 14-Pin Flash, 8-bit Microcontrollers.
PIC16(L)F1507 Data Sheet, 20-Pin Flash, 8-bit Microcontrollers.
PIC16(L)F1508/9 Data Sheet, 20-Pin Flash, 8-bit Microcontrollers.
Note:
For other small form-factor package availability and marking information, please visit
http://www.microchip.com/packaging or contact your local sales office.
DS40001609B-page 2
2011-2013 Microchip Technology Inc.
PIC16(L)F1508/9
PIN DIAGRAMS
Pin Diagram – 20-Pin PDIP, SOIC, SSOP
VDD
1
VSS
20
19
18
RA0/ICSPDAT
RA1/ICSPCLK
RA5
2
3
4
RA4
MCLR/VPP/RA3
RC5
17 RA2
16
15
14
13
12
RC0
RC1
RC2
5
6
RC4
RC3
7
RC6
8
RB4
RB5
RC7
RB7
9
10
11 RB6
Note: See Table 1 for location of all peripheral functions.
Pin Diagram – 20-Pin QFN
20 19 18
17 16
RA1/ICSPCLK
RA2
15
14
13
12
11
MCLR/VPP/RA3
1
2
3
4
5
RC5
RC4
RC3
PIC16F1508/9
PIC16LF1508/9
RC0
RC1
RC2
RC6
9
10
7
8
6
Note 1: See Table 1 for location of all peripheral functions.
2: It is recommended that the exposed bottom pad be connected to VSS.
2011-2013 Microchip Technology Inc.
DS40001609B-page 3
PIC16(L)F1508/9
PIN ALLOCATION TABLE
TABLE 1:
20-PIN ALLOCATION TABLE (PIC16(L)F1508/9)
RA0
RA1
19 16
AN0 DAC1OUT1 C1IN+
—
—
—
—
—
—
—
—
—
—
—
—
IOC
IOC
Y
Y
ICSPDAT
ICDDAT
—
—
18 15
17 14
AN1
VREF+
C1IN0-
C2IN0-
CLC4IN1
ICSPCLK
ICDCLK
—
RA2
RA3
RA4
RA5
AN2 DAC1OUT2 C1OUT
T0CKI
T1G(1)
CWG1FLT
—
—
CLC1
CLC1IN0
—
PWM3
—
INT/
IOC
Y
Y
Y
Y
—
4
3
2
1
—
AN3
—
—
—
—
—
—
—
—
—
—
SS(1)
—
—
—
—
IOC
IOC
IOC
MCLR
VPP
20
19
SOSCO
T1G
—
—
CLKOUT
OSC2
SOSCI
T1CKI
—
NCO1CLK
—
—
CLKIN
OSC1
RB4
RB5
RB6
RB7
13 10 AN10
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
RX/DT
—
SDA/SDI
—
—
—
—
—
—
—
—
CLC3IN0
CLC4IN0
—
—
—
IOC
IOC
IOC
IOC
—
Y
Y
—
—
—
—
—
—
12
11
10
9
8
7
AN11
—
—
—
SCL/SCK
—
—
Y
—
—
TX/CK
—
—
—
—
—
CLC3
CLC2
—
—
Y
RC0 16 13
RC1 15 12
AN4
AN5
C2IN+
—
—
—
—
C1IN1-
C2IN1-
—
NCO1
PWM4
—
RC2 14 11
AN6
AN7
—
—
—
—
C1IN2-
C2IN2-
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
RC3
RC4
7
6
4
3
C1IN3-
C2IN3-
CLC2IN0 PWM2
C2OUT
CWG1B
CLC4
CLC2IN1
CLC1(1) PWM1
—
RC5
RC6
RC7
VDD
VSS
5
8
9
1
2
5
—
AN8
AN9
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
SS
SDO
—
CWG1A
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
NCO1(1) CLC3IN1
—
—
—
—
6
—
—
—
CLC1IN1
—
18
—
—
VDD
VSS
20 17
—
—
Note 1: Alternate pin function selected with the APFCON (Register 11-1) register.
DS40001609B-page 4
2011-2013 Microchip Technology Inc.
PIC16(L)F1508/9
TABLE OF CONTENTS
1.0 Device Overview .......................................................................................................................................................................... 7
2.0 Enhanced Mid-Range CPU........................................................................................................................................................ 13
3.0 Memory Organization................................................................................................................................................................. 15
4.0 Device Configuration.................................................................................................................................................................. 41
5.0 Oscillator Module (With Fail-Safe Clock Monitor)....................................................................................................................... 47
6.0 Resets ........................................................................................................................................................................................ 63
7.0 Interrupts .................................................................................................................................................................................... 71
8.0 Power-Down Mode (Sleep) ........................................................................................................................................................ 85
9.0 Watchdog Timer (WDT) ............................................................................................................................................................. 89
10.0 Flash Program Memory Control ................................................................................................................................................. 93
11.0 I/O Ports ................................................................................................................................................................................... 109
12.0 Interrupt-On-Change ................................................................................................................................................................ 123
13.0 Fixed Voltage Reference (FVR) ............................................................................................................................................... 129
14.0 Temperature Indicator Module ................................................................................................................................................. 131
15.0 Analog-to-Digital Converter (ADC) Module .............................................................................................................................. 133
16.0 5-Bit Digital-to-Analog Converter (DAC) Module...................................................................................................................... 147
17.0 Comparator Module.................................................................................................................................................................. 151
18.0 Timer0 Module ......................................................................................................................................................................... 159
19.0 Timer1 Module with Gate Control............................................................................................................................................. 163
20.0 Timer2 Module ......................................................................................................................................................................... 175
21.0 Master Synchronous Serial Port (MSSP) Module .................................................................................................................... 179
22.0 Enhanced Universal Synchronous Asynchronous Receiver Transmitter (EUSART)............................................................... 235
23.0 Pulse Width Modulation (PWM) Module................................................................................................................................... 263
24.0 Configurable Logic Cell (CLC).................................................................................................................................................. 269
25.0 Numerically Controlled Oscillator (NCO) Module..................................................................................................................... 285
26.0 Complementary Waveform Generator (CWG) Module ............................................................................................................ 295
27.0 In-Circuit Serial Programming™ (ICSP™) ............................................................................................................................... 307
28.0 Instruction Set Summary.......................................................................................................................................................... 309
29.0 Electrical Specifications............................................................................................................................................................ 323
30.0 DC and AC Characteristics Graphs and Charts....................................................................................................................... 353
31.0 Development Support............................................................................................................................................................... 395
32.0 Packaging Information.............................................................................................................................................................. 399
Appendix A: Data Sheet Revision History.......................................................................................................................................... 409
Index .................................................................................................................................................................................................. 411
The Microchip Web Site..................................................................................................................................................................... 417
Customer Change Notification Service .............................................................................................................................................. 417
Customer Support.............................................................................................................................................................................. 418
Reader Response.............................................................................................................................................................................. 418
Product Identification System ............................................................................................................................................................ 419
2011-2013 Microchip Technology Inc.
DS40001609B-page 5
PIC16(L)F1508/9
TO OUR VALUED CUSTOMERS
It is our intention to provide our valued customers with the best documentation possible to ensure successful use of your Microchip
products. To this end, we will continue to improve our publications to better suit your needs. Our publications will be refined and
enhanced as new volumes and updates are introduced.
If you have any questions or comments regarding this publication, please contact the Marketing Communications Department via
E-mail at docerrors@microchip.com or fax the Reader Response Form in the back of this data sheet to (480) 792-4150. We
welcome your feedback.
Most Current Data Sheet
To obtain the most up-to-date version of this data sheet, please register at our Worldwide Web site at:
http://www.microchip.com
You can determine the version of a data sheet by examining its literature number found on the bottom outside corner of any page.
The last character of the literature number is the version number, (e.g., DS30000A is version A of document DS30000).
Errata
An errata sheet, describing minor operational differences from the data sheet and recommended workarounds, may exist for current
devices. As device/documentation issues become known to us, we will publish an errata sheet. The errata will specify the revision
of silicon and revision of document to which it applies.
To determine if an errata sheet exists for a particular device, please check with one of the following:
•
•
Microchip’s Worldwide Web site; http://www.microchip.com
Your local Microchip sales office (see last page)
When contacting a sales office, please specify which device, revision of silicon and data sheet (include literature number) you are
using.
Customer Notification System
Register on our web site at www.microchip.com to receive the most current information on all of our products.
DS40001609B-page 6
2011-2013 Microchip Technology Inc.
PIC16(L)F1508/9
1.0
DEVICE OVERVIEW
The PIC16(L)F1508/9 are described within this data
sheet. Figure 1-1 shows a block diagram of the
PIC16(L)F1508/9 devices. Tables 1-2 shows the pinout
descriptions.
Reference Table 1-1 for peripherals available per
device.
TABLE 1-1:
Peripheral
DEVICE PERIPHERAL SUMMARY
Analog-to-Digital Converter (ADC)
●
●
●
●
●
●
●
●
●
●
Complementary Wave Generator
(CWG)
Digital-to-Analog Converter (DAC)
●
●
●
●
●
●
Enhanced Universal
Synchronous/Asynchronous
Receiver/Transmitter (EUSART)
Fixed Voltage Reference (FVR)
●
●
●
●
●
●
●
●
●
●
●
●
●
●
●
Numerically Controlled Oscillator (NCO)
Temperature Indicator
Comparators
C1
●
●
●
●
●
●
●
C2
Configurable Logic Cell (CLC)
CLC1
●
●
●
●
●
●
●
●
●
●
●
●
●
●
CLC2
CLC3
CLC4
Master Synchronous Serial Ports
MSSP1
●
●
●
PWM Modules
PWM1
●
●
●
●
●
●
●
●
●
●
●
●
●
●
●
●
●
●
●
●
PWM2
PWM3
PWM4
Timers
Timer0
●
●
●
●
●
●
●
●
●
●
●
●
●
●
●
Timer1
Timer2
2011-2013 Microchip Technology Inc.
DS40001609B-page 7
PIC16(L)F1508/9
FIGURE 1-1:
PIC16(L)F1508/9 BLOCK DIAGRAM
Program
Flash Memory
RAM
Timing
Generation
OSC2/CLKOUT
PORTA
PORTB
CPU
OSC1/CLKIN
INTRC
Oscillator
(Figure 2-1)
MCLR
PORTC
NCO1
Timer0
PWM2
Timer1
PWM3
Timer2
PWM4
CLC1
CLC2
CLC3
CLC4
C1
C2
CWG1
Temp.
Indicator
ADC
10-Bit
MSSP1
FVR
EUSART
DAC
PWM1
Note 1:
2:
See applicable chapters for more information on peripherals.
See Table 1-1 for peripherals available on specific devices.
DS40001609B-page 8
2011-2013 Microchip Technology Inc.
PIC16(L)F1508/9
TABLE 1-2:
PIC16(L)F1508/9 PINOUT DESCRIPTION
Input Output
Function
Name
Description
Type
Type
RA0/AN0/C1IN+/DAC1OUT1/
ICSPDAT/ICDDAT
RA0
AN0
TTL
AN
AN
—
CMOS General purpose I/O.
—
—
ADC Channel input.
C1IN+
DAC1OUT1
ICSPDAT
ICDDAT
RA1
Comparator positive input.
Digital-to-Analog Converter output.
AN
ST
CMOS ICSP™ Data I/O.
ST
CMOS In-Circuit Debug data.
CMOS General purpose I/O.
RA1/AN1/CLC4IN1/VREF+/
C1IN0-/C2IN0-/ICSPCLK/
ICDCLK
TTL
AN
ST
AN1
—
—
—
—
—
—
—
ADC Channel input.
CLC4IN1
VREF+
C1IN0-
C2IN0-
ICSPCLK
ICDCLK
RA2
Configurable Logic Cell source input.
ADC Positive Voltage Reference input.
Comparator negative input.
Comparator negative input.
ICSP Programming Clock.
In-Circuit Debug Clock.
AN
AN
AN
ST
ST
RA2/AN2/C1OUT/DAC1OUT2/
T0CKI/INT/PWM3/CLC1/
CWG1FLT
ST
CMOS General purpose I/O.
ADC Channel input.
CMOS Comparator output.
AN2
AN
—
—
C1OUT
DAC1OUT2
T0CKI
INT
—
AN
—
Digital-to-Analog Converter output.
ST
Timer0 clock input.
External interrupt.
ST
—
PWM3
CLC1
—
CMOS PWM output.
—
CMOS Configurable Logic Cell source output.
CWG1FLT
RA3
ST
—
—
—
—
—
—
—
Complementary Waveform Generator Fault input.
General purpose input with IOC and WPU.
Configurable Logic Cell source input.
Programming voltage.
(1)
(1)
RA3/CLC1IN0/VPP/T1G /SS
MCLR
/
TTL
ST
CLC1IN0
VPP
HV
ST
T1G
Timer1 Gate input.
SS
ST
Slave Select input.
MCLR
RA4
ST
Master Clear with internal pull-up.
RA4/AN3/SOSCO/
CLKOUT/T1G
TTL
AN
XTAL
—
CMOS General purpose I/O.
ADC Channel input.
AN3
—
SOSCO
CLKOUT
T1G
XTAL Secondary Oscillator Connection.
CMOS FOSC/4 output.
ST
—
Timer1 Gate input.
RA5/CLKIN/T1CKI/NCO1CLK/
SOSCI
RA5
TTL
CMOS
ST
CMOS General purpose I/O.
CLKIN
T1CKI
NCO1CLK
SOSCI
—
—
—
External clock input (EC mode).
Timer1 clock input.
ST
Numerically Controlled Oscillator Clock source input.
XTAL
XTAL Secondary Oscillator Connection.
Legend: AN = Analog input or output CMOS= CMOS compatible input or output
OD = Open Drain
2
2
TTL = TTL compatible input ST
HV = High Voltage
= Schmitt Trigger input with CMOS levels I C™ = Schmitt Trigger input with I C
levels
XTAL = Crystal
Note 1: Alternate pin function selected with the APFCON (Register 11-1) register.
2011-2013 Microchip Technology Inc.
DS40001609B-page 9
PIC16(L)F1508/9
TABLE 1-2:
PIC16(L)F1508/9 PINOUT DESCRIPTION (CONTINUED)
Input Output
Name
Function
Description
Type
Type
RB4/AN10/CLC3IN0/SDA/SDI
RB4
AN10
CLC3IN0
SDA
TTL
AN
ST
CMOS General purpose I/O.
—
—
ADC Channel input.
Configurable Logic Cell source input.
2
2
I C
OD
—
I C data input/output.
SDI
CMOS
TTL
AN
SPI data input.
RB5/AN11/CLC4IN0/RX/DT
RB5
CMOS General purpose I/O.
AN11
CLC4IN0
RX
—
—
—
ADC Channel input.
ST
Configurable Logic Cell source input.
USART asynchronous input.
ST
DT
ST
CMOS USART synchronous data.
RB6/SCL/SCK
RB6
TTL
CMOS General purpose I/O.
2
2
SCL
I C
OD
I C™ clock.
SCK
ST
TTL
—
CMOS SPI clock.
RB7/CLC3/TX/CK
RB7
CMOS General purpose I/O.
CLC3
TX
CMOS Configurable Logic Cell source output.
CMOS USART asynchronous transmit.
CMOS USART synchronous clock.
CMOS General purpose I/O.
—
CK
ST
TTL
AN
—
RC0/AN4/CLC2/C2IN+
RC0
AN4
—
ADC Channel input.
CMOS Configurable Logic Cell source output.
Comparator positive input.
CMOS General purpose I/O.
CLC2
C2IN+
RC1
AN
TTL
AN
AN
AN
—
—
RC1/AN5/C1IN1-/C2IN1-/PWM4/
NCO1
AN5
—
—
—
ADC Channel input.
C1IN1-
C2IN1-
PWM4
NCO1
RC2
Comparator negative input.
Comparator negative input.
CMOS PWM output.
—
CMOS Numerically Controlled Oscillator is source output.
CMOS General purpose I/O.
RC2/AN6/C1IN2-/C2IN2-
TTL
AN
AN
AN
TTL
AN
AN
AN
—
AN6
—
—
—
ADC Channel input.
C1IN2-
C2IN2-
RC3
Comparator negative input.
Comparator negative input.
RC3/AN7/C1IN3-/C2IN3-/PWM2/
CLC2IN0
CMOS General purpose I/O.
AN7
—
—
—
ADC Channel input.
C1IN3-
C2IN3-
PWM2
CLC2IN0
RC4
Comparator negative input.
Comparator negative input.
CMOS PWM output.
ST
TTL
—
—
Configurable Logic Cell source input.
RC4/C2OUT/CLC2IN1/CLC4/
CWG1B
CMOS General purpose I/O.
CMOS Comparator output.
C2OUT
CLC2IN1
CLC4
CWG1B
ST
—
—
Configurable Logic Cell source input.
CMOS Configurable Logic Cell source output.
CMOS CWG complementary output.
—
Legend: AN = Analog input or output CMOS= CMOS compatible input or output
OD = Open Drain
2
2
TTL = TTL compatible input ST
HV = High Voltage
= Schmitt Trigger input with CMOS levels I C™ = Schmitt Trigger input with I C
levels
XTAL = Crystal
Note 1: Alternate pin function selected with the APFCON (Register 11-1) register.
DS40001609B-page 10
2011-2013 Microchip Technology Inc.
PIC16(L)F1508/9
TABLE 1-2:
PIC16(L)F1508/9 PINOUT DESCRIPTION (CONTINUED)
Input Output
Name
Function
Description
Type
Type
(1)
RC5/PWM1/CLC1
CWG1A
/
RC5
PWM1
CLC1
CWG1A
RC6
TTL
—
CMOS General purpose I/O.
CMOS PWM output.
—
CMOS Configurable Logic Cell source output.
CMOS CWG primary output.
—
(1)
RC6/AN8/NCO1 /CLC3IN1/
SS
TTL
AN
CMOS General purpose I/O.
AN8
—
ADC Channel input.
NCO1
CLC3IN1
SS
—
CMOS Numerically Controlled Oscillator source output.
ST
—
—
Configurable Logic Cell source input.
Slave Select input.
ST
RC7/AN9/CLC1IN1/SDO
RC7
TTL
AN
CMOS General purpose I/O.
AN9
—
—
ADC Channel input.
CLC1IN1
SDO
ST
Configurable Logic Cell source input.
—
CMOS SPI data output.
VDD
VSS
VDD
Power
Power
—
—
Positive supply.
VSS
Ground reference.
Legend: AN = Analog input or output CMOS= CMOS compatible input or output
OD = Open Drain
2
2
TTL = TTL compatible input ST
HV = High Voltage
= Schmitt Trigger input with CMOS levels I C™ = Schmitt Trigger input with I C
levels
XTAL = Crystal
Note 1: Alternate pin function selected with the APFCON (Register 11-1) register.
2011-2013 Microchip Technology Inc.
DS40001609B-page 11
PIC16(L)F1508/9
NOTES:
DS40001609B-page 12
2011-2013 Microchip Technology Inc.
PIC16(L)F1508/9
• Automatic Interrupt Context Saving
2.0
ENHANCED MID-RANGE CPU
• 16-level Stack with Overflow and Underflow
• File Select Registers
This family of devices contain an enhanced mid-range
8-bit CPU core. The CPU has 49 instructions. Interrupt
capability includes automatic context saving. The
hardware stack is 16 levels deep and has Overflow and
Underflow Reset capability. Direct, Indirect, and
Relative addressing modes are available. Two File
Select Registers (FSRs) provide the ability to read
program and data memory.
• Instruction Set
FIGURE 2-1:
CORE BLOCK DIAGRAM
15
Configuration
15
8
Data Bus
Program Counter
Flash
Program
Memory
16-LevelStack
(15-bit)
RAM
Program
Bus
14
RAM Addr
Program Memory
Read (PMR)
12
Addr MUX
InstructionReg
Indirect
Addr
7
Direct Addr
12
12
5
BSR Reg
15
FSR0 Reg
FSR1 Reg
15
STATUSReg
8
3
MUX
Power-up
Timer
Instruction
Decodeand
Control
ALU
Power-on
Reset
CLKIN
CLKOUT
8
Watchdog
Timer
Timing
Generation
W Reg
Brown-out
Reset
Internal
Oscillator
Block
VDD
VSS
2011-2013 Microchip Technology Inc.
DS40001609B-page 13
PIC16(L)F1508/9
2.1
Automatic Interrupt Context
Saving
During interrupts, certain registers are automatically
saved in shadow registers and restored when returning
from the interrupt. This saves stack space and user
code. See Section 7.5 “Automatic Context Saving”,
for more information.
2.2
16-Level Stack with Overflow and
Underflow
These devices have a hardware stack memory 15 bits
wide and 16 words deep. A Stack Overflow or Under-
flow will set the appropriate bit (STKOVF or STKUNF)
in the PCON register, and if enabled, will cause a soft-
ware Reset. See section Section 3.4 “Stack” for more
details.
2.3
File Select Registers
There are two 16-bit File Select Registers (FSR). FSRs
can access all file registers and program memory,
which allows one Data Pointer for all memory. When an
FSR points to program memory, there is one additional
instruction cycle in instructions using INDF to allow the
data to be fetched. General purpose memory can now
also be addressed linearly, providing the ability to
access contiguous data larger than 80 bytes. There are
also new instructions to support the FSRs. See
Section 3.5 “Indirect Addressing” for more details.
2.4
Instruction Set
There are 49 instructions for the enhanced mid-range
CPU to support the features of the CPU. See
Section 28.0 “Instruction Set Summary” for more
details.
DS40001609B-page 14
2011-2013 Microchip Technology Inc.
PIC16(L)F1508/9
The following features are associated with access and
control of program memory and data memory:
3.0
MEMORY ORGANIZATION
These devices contain the following types of memory:
• PCL and PCLATH
• Stack
• Program Memory
- Configuration Words
- Device ID
• Indirect Addressing
- User ID
3.1
Program Memory Organization
- Flash Program Memory
• Data Memory
The enhanced mid-range core has a 15-bit program
counter capable of addressing a 32K x 14 program
memory space. Table 3-1 shows the memory sizes
- Core Registers
- Special Function Registers
- General Purpose RAM
- Common RAM
implemented. Accessing
a location above these
boundaries will cause a wrap-around within the
implemented memory space. The Reset vector is at
0000h and the interrupt vector is at 0004h (See
Figure 3-1).
TABLE 3-1:
Device
DEVICE SIZES AND ADDRESSES
Program Memory
Space (Words)
Last Program Memory
Address
High-Endurance Flash
Memory Address Range (1)
PIC16F1508
PIC16LF1508
4,096
8,192
0FFFh
1FFFh
0F80h-0FFFh
1F80h-1FFFh
PIC16F1509
PIC16LF1509
Note 1: High-endurance Flash applies to low byte of each address in the range.
2011-2013 Microchip Technology Inc.
DS40001609B-page 15
PIC16(L)F1508/9
FIGURE 3-1:
PROGRAM MEMORY MAP
AND STACK FOR
PIC16(L)F1508
FIGURE 3-2:
PROGRAM MEMORY MAP
AND STACK FOR
PIC16(L)F1509
PC<14:0>
15
PC<14:0>
CALL, CALLW
RETURN, RETLW
Interrupt, RETFIE
CALL, CALLW
RETURN, RETLW
Interrupt, RETFIE
15
Stack Level 0
Stack Level 1
Stack Level 0
Stack Level 1
Stack Level 15
Reset Vector
Stack Level 15
Reset Vector
0000h
0000h
Interrupt Vector
Page 0
0004h
0005h
Interrupt Vector
Page 0
0004h
0005h
On-chip
Program
Memory
07FFh
0800h
07FFh
0800h
Page 1
Page 1
Page 2
On-chip
Program
Memory
0FFFh
1000h
0FFFh
1000h
Rollover to Page 0
17FFh
1800h
Page 3
1FFFh
2000h
Rollover to Page 0
Rollover to Page 3
Rollover to Page 1
7FFFh
7FFFh
DS40001609B-page 16
2011-2013 Microchip Technology Inc.
PIC16(L)F1508/9
3.1.1
READING PROGRAM MEMORY AS
DATA
3.1.1.2
Indirect Read with FSR
The program memory can be accessed as data by set-
ting bit 7 of the FSRxH register and reading the match-
ing INDFx register. The MOVIWinstruction will place the
lower eight bits of the addressed word in the W register.
Writes to the program memory cannot be performed via
the INDF registers. Instructions that access the pro-
gram memory via the FSR require one extra instruction
cycle to complete. Example 3-2 demonstrates access-
ing the program memory via an FSR.
There are two methods of accessing constants in pro-
gram memory. The first method is to use tables of
RETLW instructions. The second method is to set an
FSR to point to the program memory.
3.1.1.1
RETLWInstruction
The RETLWinstruction can be used to provide access
to tables of constants. The recommended way to cre-
ate such a table is shown in Example 3-1.
The HIGHoperator will set bit<7> if a label points to a
location in program memory.
EXAMPLE 3-1:
constants
BRW
RETLWINSTRUCTION
EXAMPLE 3-2:
ACCESSING PROGRAM
MEMORY VIA FSR
;Add Index in W to
;program counter to
;select data
;Index0 data
;Index1 data
constants
RETLW DATA0
RETLW DATA1
RETLW DATA2
RETLW DATA3
my_function
;Index0 data
;Index1 data
RETLW DATA0
RETLW DATA1
RETLW DATA2
RETLW DATA3
;… LOTS OF CODE…
MOVLW
MOVWF
MOVLW
MOVWF
MOVIW
LOW constants
FSR1L
HIGH constants
FSR1H
0[FSR1]
my_function
;… LOTS OF CODE…
MOVLW DATA_INDEX
call constants
;… THE CONSTANT IS IN W
;THE PROGRAM MEMORY IS IN W
The BRWinstruction makes this type of table very sim-
ple to implement. If your code must remain portable
with previous generations of microcontrollers, then the
BRWinstruction is not available so the older table read
method must be used.
2011-2013 Microchip Technology Inc.
DS40001609B-page 17
PIC16(L)F1508/9
3.2.1
CORE REGISTERS
3.2
Data Memory Organization
The core registers contain the registers that directly
affect the basic operation. The core registers occupy
the first 12 addresses of every data memory bank
(addresses x00h/x08h through x0Bh/x8Bh). These
registers are listed below in Table 3-2. For detailed
information, see Table 3-8.
The data memory is partitioned in 32 memory banks
with 128 bytes in a bank. Each bank consists of
(Figure 3-3):
• 12 core registers
• 20 Special Function Registers (SFR)
• Up to 80 bytes of General Purpose RAM (GPR)
• 16 bytes of common RAM
TABLE 3-2:
CORE REGISTERS
The active bank is selected by writing the bank number
into the Bank Select Register (BSR). Unimplemented
memory will read as ‘0’. All data memory can be
accessed either directly (via instructions that use the
file registers) or indirectly via the two File Select
Registers (FSR). See Section 3.5 “Indirect
Addressing” for more information.
Addresses
BANKx
x00h or x80h
x01h or x81h
x02h or x82h
x03h or x83h
x04h or x84h
x05h or x85h
x06h or x86h
x07h or x87h
x08h or x88h
x09h or x89h
INDF0
INDF1
PCL
STATUS
FSR0L
FSR0H
FSR1L
FSR1H
BSR
Data memory uses a 12-bit address. The upper seven
bits of the address define the Bank address and the
lower five bits select the registers/RAM in that bank.
WREG
PCLATH
INTCON
x0Ah or x8Ah
x0Bh or x8Bh
DS40001609B-page 18
2011-2013 Microchip Technology Inc.
PIC16(L)F1508/9
For example, CLRF STATUSwill clear the upper three
bits and set the Z bit. This leaves the STATUS register
as ‘000u u1uu’ (where u= unchanged).
3.2.1.1
STATUS Register
The STATUS register, shown in Register 3-1, contains:
• the arithmetic status of the ALU
• the Reset status
It is recommended, therefore, that only BCF, BSF,
SWAPF and MOVWF instructions are used to alter the
STATUS register, because these instructions do not
affect any Status bits. For other instructions not
affecting any Status bits (Refer to Section 28.0
“Instruction Set Summary”).
The STATUS register can be the destination for any
instruction, like any other register. If the STATUS
register is the destination for an instruction that affects
the Z, DC or C bits, then the write to these three bits is
disabled. These bits are set or cleared according to the
device logic. Furthermore, the TO and PD bits are not
writable. Therefore, the result of an instruction with the
STATUS register as destination may be different than
intended.
Note 1: The C and DC bits operate as Borrow
and Digit Borrow out bits, respectively, in
subtraction.
REGISTER 3-1:
STATUS: STATUS REGISTER
U-0
—
U-0
—
U-0
—
R-1/q
TO
R-1/q
PD
R/W-0/u
Z
R/W-0/u
DC(1)
R/W-0/u
C(1)
bit 7
bit 0
Legend:
R = Readable bit
u = Bit is unchanged
‘1’ = Bit is set
W = Writable bit
x = Bit is unknown
‘0’ = Bit is cleared
U = Unimplemented bit, read as ‘0’
-n/n = Value at POR and BOR/Value at all other Resets
q = Value depends on condition
bit 7-5
bit 4
Unimplemented: Read as ‘0’
TO: Time-Out bit
1= After power-up, CLRWDTinstruction or SLEEPinstruction
0= A WDT time-out occurred
bit 3
bit 2
bit 1
bit 0
PD: Power-Down bit
1= After power-up or by the CLRWDTinstruction
0= By execution of the SLEEPinstruction
Z: Zero bit
1= The result of an arithmetic or logic operation is zero
0= The result of an arithmetic or logic operation is not zero
DC: Digit Carry/Digit Borrow bit (ADDWF, ADDLW, SUBLW, SUBWFinstructions)(1)
1= A carry-out from the 4th low-order bit of the result occurred
0= No carry-out from the 4th low-order bit of the result
C: Carry/Borrow bit(1) (ADDWF, ADDLW, SUBLW, SUBWF instructions)(1)
1= A carry-out from the Most Significant bit of the result occurred
0= No carry-out from the Most Significant bit of the result occurred
Note 1: For Borrow, the polarity is reversed. A subtraction is executed by adding the two’s complement of the
second operand. For rotate (RRF, RLF) instructions, this bit is loaded with either the high-order or low-order
bit of the source register.
2011-2013 Microchip Technology Inc.
DS40001609B-page 19
PIC16(L)F1508/9
3.2.2
SPECIAL FUNCTION REGISTER
FIGURE 3-3:
BANKED MEMORY
PARTITIONING
The Special Function Registers are registers used by
the application to control the desired operation of
peripheral functions in the device. The Special Function
Registers occupy the 20 bytes after the core registers of
every data memory bank (addresses x0Ch/x8Ch
through x1Fh/x9Fh). The registers associated with the
operation of the peripherals are described in the appro-
priate peripheral chapter of this data sheet.
Memory Region
7-bit Bank Offset
00h
Core Registers
(12 bytes)
0Bh
0Ch
3.2.3
GENERAL PURPOSE RAM
Special Function Registers
(20 bytes maximum)
There are up to 80 bytes of GPR in each data memory
bank. The Special Function Registers occupy the 20
bytes after the core registers of every data memory
bank (addresses x0Ch/x8Ch through x1Fh/x9Fh).
1Fh
20h
3.2.3.1
Linear Access to GPR
The general purpose RAM can be accessed in a
non-banked method via the FSRs. This can simplify
access to large memory structures. See Section 3.5.2
“Linear Data Memory” for more information.
General Purpose RAM
(80 bytes maximum)
3.2.4
COMMON RAM
There are 16 bytes of common RAM accessible from all
banks.
6Fh
70h
Common RAM
(16 bytes)
7Fh
3.2.5
DEVICE MEMORY MAPS
The memory maps for PIC16(L)F1508/9 are as shown
in Table 3-5 and Table 3-6.
DS40001609B-page 20
2011-2013 Microchip Technology Inc.
TABLE 3-3:
PIC16(L)F1508 MEMORY MAP, BANK 1-7
BANK 0
BANK 1
BANK 2
BANK 3
BANK 4
BANK 5
BANK 6
BANK 7
000h
080h
100h
180h
200h
280h
300h
380h
Core Registers
(Table 3-2)
Core Registers
(Table 3-2)
Core Registers
(Table 3-2)
Core Registers
(Table 3-2)
Core Registers
(Table 3-2)
Core Registers
(Table 3-2)
Core Registers
(Table 3-2)
Core Registers
(Table 3-2)
00Bh
00Ch
00Dh
00Eh
00Fh
010h
08Bh
08Ch
08Dh
08Eh
08Fh
090h
10Bh
10Ch
10Dh
10Eh
10Fh
110h
18Bh
18Ch
18Dh
18Eh
18Fh
190h
20Bh
20Ch
20Dh
20Eh
20Fh
210h
28Bh
28Ch
28Dh
28Eh
28Fh
290h
30Bh
30Ch
30Dh
30Eh
30Fh
310h
38Bh
38Ch
38Dh
38Eh
38Fh
390h
PORTA
PORTB
PORTC
—
TRISA
TRISB
TRISC
—
LATA
LATB
LATC
—
ANSELA
ANSELB
ANSELC
—
WPUA
WPUB
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
SSP1BUF
011h
012h
013h
014h
015h
016h
017h
018h
019h
01Ah
01Bh
01Ch
01Dh
01Eh
01Fh
020h
PIR1
PIR2
091h
092h
093h
094h
PIE1
PIE2
PIE3
—
111h
112h
113h
114h
CM1CON0
CM1CON1
CM2CON0
CM2CON1
CMOUT
191h
192h
193h
194h
195h
196h
197h
198h
199h
19Ah
19Bh
19Ch
PMADRL
PMADRH
PMDATL
PMDATH
PMCON1
PMCON2
VREGCON
—
211h
212h
213h
214h
215h
216h
217h
218h
219h
21Ah
21Bh
21Ch
291h
292h
293h
294h
295h
296h
297h
298h
299h
29Ah
29Bh
29Ch
311h
312h
313h
314h
315h
316h
317h
318h
319h
31Ah
31Bh
31Ch
391h
392h
393h
394h
395h
396h
397h
398h
399h
39Ah
39Bh
39Ch
IOCAP
IOCAN
IOCAF
—
—
—
—
—
—
—
—
—
—
—
—
—
—
SSP1ADD
SSP1MSK
PIR3
SSP1STAT
—
IOCBP
IOCBN
IOCBF
—
SSP1CON1
TMR0
TMR1L
TMR1H
T1CON
T1GCON
TMR2
PR2
095h OPTION_REG 115h
096h
097h
098h
099h
09Ah
09Bh
09Ch
09Dh
09Eh
PCON
WDTCON
—
116h
117h
118h
119h
11Ah
11Bh
11Ch
11Dh
11Eh
BORCON
FVRCON
SSP1CON2
SSP1CON3
—
—
—
—
—
—
—
—
—
DAC1CON0
OSCCON
OSCSTAT
ADRESL
ADRESH
ADCON0
ADCON1
ADCON2
—
RCREG
TXREG
DAC1CON1
—
—
—
—
—
SPBRG
T2CON
—
SPBRGH
RCSTA
—
—
—
—
APFCON
—
19Dh
19Eh
21Dh
21Eh
29Dh
29Eh
31Dh
31Eh
39Dh
39Eh
—
TXSTA
—
BAUDCON
09Fh
0A0h
11Fh
120h
—
19Fh
1A0h
21Fh
220h
29Fh
2A0h
31Fh
320h
39Fh
3A0h
General
Purpose
Register
80 Bytes
General
Purpose
Register
80 Bytes
General
Purpose
Register
80 Bytes
Unimplemented
Read as ‘0’
Unimplemented
Read as ‘0’
Unimplemented
Read as ‘0’
Unimplemented
Read as ‘0’
Unimplemented
Read as ‘0’
36Fh
370h
3EFh
3F0h
0EFh
0F0h
16Fh
170h
1EFh
1F0h
26Fh
270h
2EFh
2F0h
06Fh
070h
Common RAM
(Accesses
Common RAM
(Accesses
Common RAM
(Accesses
Common RAM
(Accesses
Common RAM
(Accesses
Common RAM
(Accesses
Common RAM
(Accesses
Common RAM
70h – 7Fh)
70h – 7Fh)
70h – 7Fh)
70h – 7Fh)
70h – 7Fh)
70h – 7Fh)
70h – 7Fh)
07Fh
0FFh
17Fh
1FFh
27Fh
2FFh
37Fh
3FFh
Legend:
= Unimplemented data memory locations, read as ‘0’.
TABLE 3-4:
PIC16(L)F1509 MEMORY MAP, BANK 1-7
BANK 0
BANK 1
BANK 2
BANK 3
BANK 4
BANK 5
BANK 6
BANK 7
000h
080h
100h
180h
200h
280h
300h
380h
Core Registers
(Table 3-2)
Core Registers
(Table 3-2)
Core Registers
(Table 3-2)
Core Registers
(Table 3-2)
Core Registers
(Table 3-2)
Core Registers
(Table 3-2)
Core Registers
(Table 3-2)
Core Registers
(Table 3-2)
00Bh
00Ch
00Dh
00Eh
00Fh
010h
08Bh
08Ch
08Dh
08Eh
08Fh
090h
10Bh
10Ch
10Dh
10Eh
10Fh
110h
18Bh
18Ch
18Dh
18Eh
18Fh
190h
20Bh
20Ch
20Dh
20Eh
20Fh
210h
28Bh
28Ch
28Dh
28Eh
28Fh
290h
30Bh
30Ch
30Dh
30Eh
30Fh
310h
38Bh
38Ch
38Dh
38Eh
38Fh
390h
PORTA
PORTB
PORTC
—
TRISA
TRISB
TRISC
—
LATA
LATB
LATC
—
ANSELA
ANSELB
ANSELC
—
WPUA
WPUB
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
SSP1BUF
011h
012h
013h
014h
015h
016h
017h
018h
019h
01Ah
01Bh
01Ch
01Dh
01Eh
01Fh
PIR1
PIR2
091h
092h
093h
094h
PIE1
PIE2
PIE3
—
111h
112h
113h
114h
CM1CON0
CM1CON1
CM2CON0
CM2CON1
CMOUT
191h
192h
193h
194h
195h
196h
197h
198h
199h
19Ah
19Bh
19Ch
PMADRL
PMADRH
PMDATL
PMDATH
PMCON1
PMCON2
VREGCON
—
211h
212h
213h
214h
215h
216h
217h
218h
219h
21Ah
21Bh
21Ch
291h
292h
293h
294h
295h
296h
297h
298h
299h
29Ah
29Bh
29Ch
311h
312h
313h
314h
315h
316h
317h
318h
319h
31Ah
31Bh
31Ch
391h
392h
393h
394h
395h
396h
397h
398h
399h
39Ah
39Bh
39Ch
IOCAP
IOCAN
IOCAF
—
—
—
—
—
—
—
—
—
—
—
—
—
—
SSP1ADD
SSP1MSK
PIR3
SSP1STAT
—
IOCBP
IOCBN
IOCBF
—
SSP1CON1
TMR0
TMR1L
TMR1H
T1CON
T1GCON
TMR2
PR2
095h OPTION_REG 115h
096h
097h
098h
099h
09Ah
09Bh
09Ch
09Dh
09Eh
09Fh
PCON
WDTCON
—
116h
117h
118h
119h
11Ah
11Bh
11Ch
11Dh
11Eh
11Fh
BORCON
FVRCON
SSP1CON2
SSP1CON3
—
—
—
—
—
—
—
—
—
DAC1CON0
OSCCON
OSCSTAT
ADRESL
ADRESH
ADCON0
ADCON1
ADCON2
—
RCREG
TXREG
DAC1CON1
—
—
—
—
—
SPBRG
T2CON
—
SPBRGH
RCSTA
—
—
—
—
APFCON
—
19Dh
19Eh
19Fh
21Dh
21Eh
21Fh
29Dh
29Eh
29Fh
31Dh
31Eh
31Fh
39Dh
39Eh
39Fh
—
TXSTA
—
BAUDCON
—
320h General Purpose
Register
0A0h
120h
1A0h
220h
2A0h
16Bytes
3A0h
020h
General
Purpose
Register
80 Bytes
General
Purpose
Register
80 Bytes
General
Purpose
Register
80 Bytes
General
Purpose
Register
80 Bytes
General
Purpose
Register
80 Bytes
General
Purpose
Register
80 Bytes
Unimplemented
Read as ‘0’
Unimplemented
Read as ‘0’
36Fh
370h
3EFh
3F0h
0EFh
0F0h
16Fh
170h
1EFh
1F0h
26Fh
270h
2EFh
2F0h
06Fh
070h
Accesses
70h – 7Fh
Accesses
70h – 7Fh
Accesses
70h – 7Fh
Accesses
70h – 7Fh
Accesses
70h – 7Fh
Accesses
70h – 7Fh
Accesses
70h – 7Fh
Common RAM
07Fh
0FFh
17Fh
1FFh
27Fh
2FFh
37Fh
3FFh
Legend:
= Unimplemented data memory locations, read as ‘0’.
TABLE 3-5:
PIC16(L)F1508/9 MEMORY MAP, BANK 8-23
BANK 8
BANK 9
BANK 10
BANK 11
BANK 12
BANK 13
BANK 14
BANK 15
400h
480h
500h
580h
600h
680h
700h
780h
Core Registers
(Table 3-2)
Core Registers
(Table 3-2)
Core Registers
(Table 3-2)
Core Registers
(Table 3-2)
Core Registers
(Table 3-2)
Core Registers
(Table 3-2)
Core Registers
(Table 3-2)
Core Registers
(Table 3-2)
40Bh
40Ch
40Dh
40Eh
40Fh
410h
411h
412h
413h
414h
415h
416h
417h
418h
419h
41Ah
41Bh
41Ch
41Dh
41Eh
48Bh
48Ch
48Dh
48Eh
48Fh
490h
491h
492h
493h
494h
495h
496h
497h
498h
499h
49Ah
49Bh
49Ch
49Dh
49Eh
50Bh
50Ch
50Dh
50Eh
50Fh
510h
511h
512h
513h
514h
515h
516h
517h
518h
519h
51Ah
51Bh
51Ch
51Dh
51Eh
58Bh
58Ch
58Dh
58Eh
58Fh
590h
591h
592h
593h
594h
595h
596h
597h
598h
599h
59Ah
59Bh
59Ch
59Dh
59Eh
60Bh
60Ch
60Dh
60Eh
60Fh
610h
611h
612h
613h
614h
615h
616h
617h
618h
619h
61Ah
61Bh
61Ch
61Dh
61Eh
68Bh
68Ch
68Dh
68Eh
68Fh
690h
691h
692h
693h
694h
695h
696h
697h
698h
699h
69Ah
69Bh
69Ch
69Dh
69Eh
70Bh
70Ch
70Dh
70Eh
70Fh
710h
711h
712h
713h
714h
715h
716h
717h
718h
719h
71Ah
71Bh
71Ch
71Dh
71Eh
78Bh
78Ch
78Dh
78Eh
78Fh
790h
791h
792h
793h
794h
795h
796h
797h
798h
799h
79Ah
79Bh
79Ch
79Dh
79Eh
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
PWM1DCL
PWM1DCH
PWM1CON
PWM2DCL
PWM2DCH
PWM2CON
PWM3DCL
PWM3DCH
PWM3CON
PWM4DCL
PWM4DCH
PWM4CON
—
CWG1DBR
CWG1DBF
CWG1CON0
CWG1CON1
—
—
—
CWG1CON2
—
—
—
—
—
—
—
—
—
—
NCO1ACCL
NCO1ACCH
NCO1ACCU
NCO1INCL
NCO1INCH
—
NCO1CON
NCO1CLK
—
—
41Fh
420h
49Fh
4A0h
51Fh
520h
59Fh
5A0h
61Fh
620h
69Fh
6A0h
71Fh
720h
79Fh
7A0h
Unimplemented
Unimplemented
Unimplemented
Unimplemented
Unimplemented
Unimplemented
Unimplemented
Unimplemented
Read as ‘0’
Read as ‘0’
Read as ‘0’
Read as ‘0’
Read as ‘0’
Read as ‘0’
Read as ‘0’
Read as ‘0’
46Fh
470h
4EFh
4F0h
56Fh
570h
5EFh
5F0h
66Fh
670h
6EFh
6F0h
76Fh
770h
7EFh
7F0h
Accesses
70h – 7Fh
Accesses
70h – 7Fh
Accesses
70h – 7Fh
Accesses
70h – 7Fh
Accesses
70h – 7Fh
Accesses
70h – 7Fh
Accesses
70h – 7Fh
Accesses
70h – 7Fh
47Fh
800h
4FFh
880h
57Fh
900h
5FFh
980h
67Fh
A00h
6FFh
A80h
77Fh
B00h
7FFh
B80h
BANK 16
BANK 17
BANK 18
BANK 19
BANK 20
BANK 21
BANK 22
BANK 23
Core Registers
(Table 3-2 )
Core Registers
(Table 3-2)
Core Registers
(Table 3-2)
Core Registers
(Table 3-2)
Core Registers
(Table 3-2)
Core Registers
(Table 3-2)
Core Registers
(Table 3-2)
Core Registers
(Table 3-2)
80Bh
80Ch
88Bh
88Ch
90Bh
90Ch
98Bh
98Ch
A0Bh
A0Ch
A8Bh
A8Ch
B0Bh
B0Ch
B8Bh
B8Ch
Unimplemented
Unimplemented
Unimplemented
Unimplemented
Unimplemented
Unimplemented
Unimplemented
Unimplemented
Read as ‘0’
Read as ‘0’
Read as ‘0’
Read as ‘0’
Read as ‘0’
Read as ‘0’
Read as ‘0’
Read as ‘0’
9EFh
9F0h
AEFh
AF0h
BEFh
BF0h
86Fh
870h
8EFh
8F0h
96Fh
970h
A6Fh
A70h
B6Fh
B70h
Accesses
70h – 7Fh
Accesses
70h – 7Fh
Accesses
70h – 7Fh
Accesses
70h – 7Fh
Accesses
70h – 7Fh
Accesses
70h – 7Fh
Accesses
70h – 7Fh
Accesses
70h – 7Fh
87Fh
8FFh
97Fh
9FFh
A7Fh
AFFh
B7Fh
BFFh
Legend:
= Unimplemented data memory locations, read as ‘0’.
TABLE 3-6:
PIC16(L)F1508/9 MEMORY MAP, BANK 24-31
BANK 24
BANK 25
BANK 26
BANK 27
BANK 28
BANK 29
BANK 30
BANK 31
C00h
C80h
D00h
D80h
E00h
E80h
F00h
F80h
Core Registers
(Table 3-2)
Core Registers
(Table 3-2)
Core Registers
(Table 3-2)
Core Registers
(Table 3-2)
Core Registers
(Table 3-2)
Core Registers
(Table 3-2)
Core Registers
(Table 3-2)
Core Registers
(Table 3-2)
C0Bh
C0Ch
C0Dh
C0Eh
C0Fh
C10h
C11h
C12h
C13h
C14h
C15h
C16h
C17h
C18h
C19h
C1Ah
C1Bh
C1Ch
C1Dh
C1Eh
C8Bh
C8Ch
C8Dh
C8Eh
C8Fh
C90h
C91h
C92h
C93h
C94h
C95h
C96h
C97h
C98h
C99h
C9Ah
C9Bh
C9Ch
C9Dh
C9Eh
D0Bh
D0Ch
D0Dh
D0Eh
D0Fh
D10h
D11h
D12h
D13h
D14h
D15h
D16h
D17h
D18h
D19h
D1Ah
D1Bh
D1Ch
D1Dh
D1Eh
D8Bh
D8Ch
D8Dh
D8Eh
D8Fh
D90h
D91h
D92h
D93h
D94h
D95h
D96h
D97h
D98h
D99h
D9Ah
D9Bh
D9Ch
D9Dh
D9Eh
E0Bh
E0Ch
E0Dh
E0Eh
E0Fh
E10h
E11h
E12h
E13h
E14h
E15h
E16h
E17h
E18h
E19h
E1Ah
E1Bh
E1Ch
E1Dh
E1Eh
E8Bh
E8Ch
E8Dh
E8Eh
E8Fh
E90h
E91h
E92h
E93h
E94h
E95h
E96h
E97h
E98h
E99h
E9Ah
E9Bh
E9Ch
E9Dh
E9Eh
F0Bh
F0Ch
F0Dh
F0Eh
F0Fh
F10h
F11h
F12h
F13h
F14h
F15h
F16h
F17h
F18h
F19h
F1Ah
F1Bh
F1Ch
F1Dh
F1Eh
F8Bh
F8Ch
F8Dh
F8Eh
F8Fh
F90h
F91h
F92h
F93h
F94h
F95h
F96h
F97h
F98h
F99h
F9Ah
F9Bh
F9Ch
F9Dh
F9Eh
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
See Table 3-7 for
register mapping
details
See Table 3-7 for
register mapping
details
C1Fh
C20h
C9Fh
CA0h
D1Fh
D20h
D9Fh
DA0h
E1Fh
E20h
E9Fh
EA0h
F1Fh
F20h
F9Fh
FA0h
Unimplemented
Unimplemented
Unimplemented
Unimplemented
Unimplemented
Unimplemented
Read as ‘0’
Read as ‘0’
Read as ‘0’
Read as ‘0’
Read as ‘0’
Read as ‘0’
C6Fh
C70h
CEFh
CF0h
D6Fh
D70h
DEFh
DF0h
E6Fh
E70h
EEFh
EF0h
F6Fh
F70h
FEFh
FF0h
Accesses
70h – 7Fh
Accesses
70h – 7Fh
Accesses
70h – 7Fh
Accesses
70h – 7Fh
Accesses
70h – 7Fh
Accesses
70h – 7Fh
Accesses
70h – 7Fh
Accesses
70h – 7Fh
CFFh
D7Fh
DFFh
E7Fh
EFFh
F7Fh
FFFh
CFFh
Legend:
= Unimplemented data memory locations, read as ‘0’.
PIC16(L)F1508/9
TABLE 3-7:
PIC16(L)F1508/9 MEMORY MAP, BANK 30-31
Bank 30
Bank 31
—
F0Ch
F8Ch
—
F0Dh
F0Eh
F0Fh
F10h
F11h
F12h
F13h
F14h
F15h
F16h
F17h
F18h
F19h
F1Ah
F1Bh
F1Ch
F1Dh
F1Eh
F1Fh
F20h
F21h
F22h
F23h
F24h
F25h
F26h
F27h
F28h
F29h
F2Ah
F2Bh
F2Ch
F2Dh
F2Eh
F2Fh
F30h
—
Unimplemented
Read as ‘0’
CLCDATA
CLC1CON
CLC1POL
CLC1SEL0
CLC1SEL1
CLC1GLS0
CLC1GLS1
CLC1GLS2
CLC1GLS3
CLC2CON
CLC2POL
CLC2SEL0
CLC2SEL1
CLC2GLS0
CLC2GLS1
CLC2GLS2
CLC2GLS3
CLC3CON
CLC3POL
CLC3SEL0
CLC3SEL1
CLC3GLS0
CLC3GLS1
CLC3GLS2
CLC3GLS3
CLC4CON
CLC4POL
CLC4SEL0
CLC4SEL1
CLC4GLS0
CLC4GLS1
CLC4GLS2
CLC4GLS3
FE3h
FE4h
FE5h
FE6h
FE7h
FE8h
FE9h
FEAh
FEBh
FECh
FEDh
FEEh
FEFh
STATUS_SHAD
WREG_SHAD
BSR_SHAD
PCLATH_SHAD
FSR0L_SHAD
FSR0H_SHAD
FSR1L_SHAD
FSR1H_SHAD
—
STKPTR
TOSL
TOSH
Unimplemented
Read as ‘0’
F6Fh
Legend:
= Unimplemented data memory locations, read as ‘0’.
2011-2013 Microchip Technology Inc.
DS40001609B-page 25
PIC16(L)F1508/9
3.2.6
CORE FUNCTION REGISTERS
SUMMARY
The Core Function registers listed in Table 3-8 can be
addressed from any Bank.
TABLE 3-8:
CORE FUNCTION REGISTERS SUMMARY
Value on
POR, BOR other Resets
Value on all
Addr
Name
Bit 7
Bit 6
Bit 5
Bit 4
Bit 3
Bit 2
Bit 1
Bit 0
Bank 0-31
x00h or
x80h
Addressing this location uses contents of FSR0H/FSR0L to address data memory
(not a physical register)
INDF0
xxxx xxxx uuuu uuuu
xxxx xxxx uuuu uuuu
0000 0000 0000 0000
---1 1000 ---q quuu
0000 0000 uuuu uuuu
0000 0000 0000 0000
0000 0000 uuuu uuuu
0000 0000 0000 0000
---0 0000 ---0 0000
0000 0000 uuuu uuuu
-000 0000 -000 0000
0000 0000 0000 0000
x01h or
x81h
Addressing this location uses contents of FSR1H/FSR1L to address data memory
(not a physical register)
INDF1
PCL
x02h or
x82h
Program Counter (PC) Least Significant Byte
x03h or
x83h
STATUS
FSR0L
FSR0H
FSR1L
FSR1H
BSR
—
—
—
TO
PD
Z
DC
C
x04h or
x84h
Indirect Data Memory Address 0 Low Pointer
Indirect Data Memory Address 0 High Pointer
Indirect Data Memory Address 1 Low Pointer
Indirect Data Memory Address 1 High Pointer
x05h or
x85h
x06h or
x86h
x07h or
x87h
x08h or
x88h
—
—
—
BSR<4:0>
x09h or
x89h
WREG
PCLATH
INTCON
Working Register
x0Ahor
x8Ah
—
Write Buffer for the upper 7 bits of the Program Counter
PEIE TMR0IE INTE IOCIE TMR0IF
x0Bhor
x8Bh
GIE
INTF
IOCIF
Legend:
x= unknown, u= unchanged, q= value depends on condition, - = unimplemented, read as ‘0’, r= reserved.
Shaded locations are unimplemented, read as ‘0’.
DS40001609B-page 26
2011-2013 Microchip Technology Inc.
PIC16(L)F1508/9
TABLE 3-9:
SPECIAL FUNCTION REGISTER SUMMARY
Value on all
other
Resets
Value on
POR, BOR
Address
Name
Bit 7
Bit 6
Bit 5
Bit 4
Bit 3
Bit 2
Bit 1
Bit 0
Bank 0
00Ch
00Dh
00Eh
00Fh
010h
011h
PORTA
PORTB
PORTC
—
—
—
RA5
RB5
RC5
RA4
RB4
RC4
RA3
—
RA2
—
RA1
—
RA0
—
--xx xxxx --xx xxxx
xxxx ---- xxxx ----
xxxx xxxx xxxx xxxx
RB7
RB6
RC6
RC7
RC3
RC2
RC1
RC0
Unimplemented
Unimplemented
TMR1GIF
OSFIF
—
—
—
—
—
PIR1
ADIF
C2IF
—
RCIF
C1IF
—
TXIF
—
SSP1IF
BCL1IF
CLC4IF
—
TMR2IF
—
TMR1IF
—
0000 0-00 0000 0-00
000- -0-- 000- -0--
---- 0000 ---- 0000
012h
013h
014h
015h
016h
017h
018h
019h
PIR2
NCO1IF
CLC3IF
PIR3
—
—
CLC2IF
CLC1IF
—
Unimplemented
—
—
TMR0
TMR1L
TMR1H
T1CON
T1GCON
Holding Register for the 8-bit Timer0 Count
xxxx xxxx uuuu uuuu
xxxx xxxx uuuu uuuu
xxxx xxxx uuuu uuuu
0000 00-0 uuuu uu-u
0000 0x00 uuuu uxuu
Holding Register for the Least Significant Byte of the 16-bit TMR1 Count
Holding Register for the Most Significant Byte of the 16-bit TMR1 Count
TMR1CS<1:0>
TMR1GE T1GPOL
T1CKPS<1:0>
T1GTM T1GSPM
T1OSCEN T1SYNC
—
TMR1ON
T1GGO/
DONE
T1GVAL
T1GSS<1:0>
01Ah
01Bh
01Ch
01Dh
01Eh
01Fh
Bank 1
08Ch
08Dh
08Eh
08Fh
090h
091h
092h
093h
094h
095h
096h
097h
098h
099h
09Ah
09Bh
09Ch
09Dh
09Eh
09Fh
TMR2
PR2
T2CON
—
Timer2 Module Register
Timer2 Period Register
—
0000 0000 0000 0000
1111 1111 1111 1111
-000 0000 -000 0000
T2OUTPS<3:0>
TMR2ON
T2CKPS<1:0>
Unimplemented
Unimplemented
Unimplemented
—
—
—
—
—
—
—
—
(2)
TRISA
TRISB
TRISC
—
—
—
TRISA5
TRISA4
TRISB4
TRISC4
—
TRISA2
—
TRISA1
TRISA0
—
--11 1111 --11 1111
1111 ---- 1111 ----
1111 1111 1111 1111
TRISB7
TRISC7
TRISB6
TRISC6
TRISB5
TRISC5
—
—
TRISC3
TRISC2
TRISC1
TRISC0
Unimplemented
Unimplemented
TMR1GIE
—
—
—
—
—
PIE1
ADIE
C2IE
—
RCIE
C1IE
—
TXIE
—
SSP1IE
BCL1IE
CLC4IE
—
TMR2IE
—
TMR1IE
—
0000 0-00 0000 0-00
000- 00-- 000- 00--
---- 0000 ---- 0000
PIE2
OSFIE
NCO1IE
CLC3IE
PIE3
—
—
CLC2IE
CLC1IE
—
Unimplemented
—
—
OPTION_REG
PCON
WDTCON
—
WPUEN
STKOVF
—
INTEDG
STKUNF
—
TMR0CS
—
TMR0SE
RWDT
PSA
PS<2:0>
POR
1111 1111 1111 1111
00-1 11qq qq-q qquu
--01 0110 --01 0110
RMCLR
RI
BOR
WDTPS<4:0>
SWDTEN
Unimplemented
—
—
—
OSCCON
OSCSTAT
ADRESL
ADRESH
ADCON0
ADCON1
ADCON2
IRCF<3:0>
—
—
SCS<1:0>
-011 1-00 -011 1-00
0-q0 --00 q-qq --qq
xxxx xxxx uuuu uuuu
xxxx xxxx uuuu uuuu
-000 0000 -000 0000
0000 --00 0000 --00
0000 ---- 0000 ----
SOSCR
—
OSTS
HFIOFR
—
LFIOFR
HFIOFS
ADC Result Register Low
ADC Result Register High
—
CHS<4:0>
GO/DONE
ADON
—
ADFM
ADCS<2:0>
TRIGSEL<3:0>
—
—
—
—
ADPREF<1:0>
—
Legend:
Note 1:
2:
x= unknown, u= unchanged, q= value depends on condition, - = unimplemented, r= reserved. Shaded locations are unimplemented, read as ‘0’.
PIC16F1508/9 only.
Unimplemented, read as ‘1’.
2011-2013 Microchip Technology Inc.
DS40001609B-page 27
PIC16(L)F1508/9
TABLE 3-9:
SPECIAL FUNCTION REGISTER SUMMARY (CONTINUED)
Value on all
other
Resets
Value on
POR, BOR
Address
Name
Bit 7
Bit 6
Bit 5
Bit 4
Bit 3
Bit 2
Bit 1
Bit 0
Bank 2
10Ch
10Dh
10Eh
10Fh
110h
111h
LATA
—
—
LATA5
LATB5
LATC5
LATA4
LATB4
LATC4
—
—
LATA2
—
LATA1
—
LATA0
—
--xx -xxx --uu -uuu
xxxx ---- uuuu ----
xxxx xxxx uuuu uuuu
LATB
LATB7
LATC7
LATB6
LATC6
LATC
LATC3
LATC2
LATC1
LATC0
—
Unimplemented
Unimplemented
—
—
—
—
—
CM1CON0
CM1CON1
CM2CON0
CM2CON1
CMOUT
BORCON
FVRCON
DAC1CON0
DAC1CON1
C1ON
C1INTP
C2ON
C2INTP
—
C1OUT
C1OE
C1POL
C2POL
—
—
—
—
—
—
C1SP
C2SP
C1HYS
C1NCH<2:0>
C2HYS
C1SYNC
C2SYNC
0000 -100 0000 -100
0000 -000 0000 -000
0000 -100 0000 -100
0000 -000 0000 -000
---- --00 ---- --00
10-- ---q uu-- ---u
0q00 0000 0q00 0000
0-00 -0-- 0-00 -0--
---0 0000 ---0 0000
112h
113h
114h
115h
116h
117h
118h
119h
C1INTN
C2OUT
C2INTN
—
C1PCH<1:0>
C2OE
C2PCH<1:0>
C2NCH<2:0>
MC2OUT
—
—
—
—
—
—
—
MC1OUT
BORRDY
SBOREN
FVREN
DACEN
—
BORFS
FVRRDY
—
TSEN
DACOE1
—
TSRNG
DACOE2
CDAFVR<1:0>
ADFVR<1:0>
—
DACPSS
—
—
—
DACR<4:0>
11Ah
to
—
Unimplemented
—
—
11Ch
11Dh
11Eh
11Fh
Bank 3
18Ch
18Dh
18Eh
18Fh
190h
191h
192h
193h
194h
195h
196h
197h
198h
199h
19Ah
19Bh
19Ch
19Dh
19Eh
19Fh
APFCON
—
—
—
SSSEL
T1GSEL
—
CLC1SEL
NCO1SEL
---0 0-00 ---0 0-00
—
—
Unimplemented
Unimplemented
—
—
—
—
ANSELA
ANSELB
ANSELC
—
—
—
—
—
—
ANSB5
—
ANSA4
ANSB4
—
—
—
ANSA2
—
ANSA1
—
ANSA0
—
---1 -111 ---1 -111
--11 ---- --11 ----
11-- 1111 11-- 1111
ANSC7
ANSC6
ANSC3
ANSC2
ANSC1
ANSC0
Unimplemented
Unimplemented
—
—
—
—
—
PMADRL
PMADRH
PMDATL
PMDATH
PMCON1
PMCON2
VREGCON(1)
—
Flash Program Memory Address Register Low Byte
0000 0000 0000 0000
1000 0000 1000 0000
xxxx xxxx uuuu uuuu
--xx xxxx --uu uuuu
1000 x000 1000 q000
0000 0000 0000 0000
---- --01 ---- --01
(2)
—
Flash Program Memory Address Register High Byte
Flash Program Memory Read Data Register Low Byte
—
—
Flash Program Memory Read Data Register High Byte
(2)
—
CFGS
LWLO
FREE
WRERR
WREN
WR
RD
Flash Program Memory Control Register 2
—
—
—
—
—
—
VREGPM
Reserved
Unimplemented
—
—
RCREG
TXREG
SPBRGL
SPBRGH
RCSTA
TXSTA
USART Receive Data Register
0000 0000 0000 0000
0000 0000 0000 0000
0000 0000 0000 0000
0000 0000 0000 0000
0000 000x 0000 000x
0000 0010 0000 0010
01-0 0-00 01-0 0-00
USART Transmit Data Register
Baud Rate Generator Data Register Low
Baud Rate Generator Data Register High
SPEN
CSRC
RX9
TX9
SREN
TXEN
—
CREN
SYNC
SCKP
ADDEN
SENDB
BRG16
FERR
BRGH
—
OERR
TRMT
WUE
RX9D
TX9D
BAUDCON
ABDOVF
RCIDL
ABDEN
Legend:
Note 1:
2:
x= unknown, u= unchanged, q= value depends on condition, - = unimplemented, r= reserved. Shaded locations are unimplemented, read as ‘0’.
PIC16F1508/9 only.
Unimplemented, read as ‘1’.
DS40001609B-page 28
2011-2013 Microchip Technology Inc.
PIC16(L)F1508/9
TABLE 3-9:
SPECIAL FUNCTION REGISTER SUMMARY (CONTINUED)
Value on all
other
Resets
Value on
POR, BOR
Address
Name
Bit 7
Bit 6
Bit 5
Bit 4
Bit 3
Bit 2
Bit 1
Bit 0
Bank 4
20Ch
WPUA
WPUB
—
—
WPUA5
WPUB5
WPUA4
WPUB4
WPUA3
—
WPUA2
—
WPUA1
—
WPUA0
—
--11 1111 --11 1111
1111 ---- 1111 ----
20Dh
WPUB7
WPUB6
20Eh
to
—
Unimplemented
—
—
210h
211h
212h
213h
214h
215h
216h
217h
SSP1BUF
SSP1ADD
SSP1MSK
SSP1STAT
SSP1CON1
SSP1CON2
SSP1CON3
Synchronous Serial Port Receive Buffer/Transmit Register
xxxx xxxx uuuu uuuu
0000 0000 0000 0000
1111 1111 1111 1111
0000 0000 0000 0000
0000 0000 0000 0000
0000 0000 0000 0000
0000 0000 0000 0000
ADD<7:0>
MSK<7:0>
SMP
WCOL
GCEN
ACKTIM
CKE
SSPOV
ACKSTAT
PCIE
D/A
P
S
R/W
UA
BF
SSPEN
ACKDT
SCIE
CKP
SSPM<3:0>
ACKEN
BOEN
RCEN
PEN
RSEN
AHEN
SEN
SDAHT
SBCDE
DHEN
218h
to
21Fh
—
—
—
—
Unimplemented
Unimplemented
Unimplemented
Unimplemented
—
—
—
—
—
—
—
—
Bank 5
28Ch
to
29Fh
Bank 6
30Ch
to
31Fh
Bank 7
38Ch
to
390h
391h
392h
393h
394h
395h
396h
IOCAP
IOCAN
IOCAF
IOCBP
IOCBN
IOCBF
—
—
—
—
—
—
IOCAP5
IOCAN5
IOCAF5
IOCBP5
IOCBN5
IOCBF5
IOCAP4
IOCAN4
IOCAF4
IOCBP4
IOCBN4
IOCBF4
IOCAP3
IOCAN3
IOCAF3
—
IOCAP2
IOCAN2
IOCAF2
—
IOCAP1
IOCAN1
IOCAF1
—
IOCAP0
IOCAN0
IOCAF0
—
--00 0000 --00 0000
--00 0000 --00 0000
--00 0000 --00 0000
0000 ---- 0000 ----
0000 ---- 0000 ----
0000 ---- 0000 ----
IOCBP7
IOCBN7
IOCBF7
IOCBP6
IOCBN6
IOCBF6
—
—
—
—
—
—
—
—
397h
to
39Fh
—
—
—
Unimplemented
Unimplemented
Unimplemented
—
—
—
—
—
—
Bank 8
40Ch
to
41Fh
Bank 9
48Ch
to
497h
498h
499h
49Ah
49Bh
49Ch
49Dh
49Eh
49Fh
NCO1ACCL
NCO1ACCH
NCO1ACCU
NCO1INCL
NCO1INCH
—
NCO1ACC<7:0>
NCO1ACC<15:8>
NCO1ACC<19:16>
NCO1INC<7:0>
0000 0000 0000 0000
0000 0000 0000 0000
0000 0000 0000 0000
0000 0000 0000 0000
0000 0000 0000 0000
NCO1INC<15:8>
Unimplemented
—
—
NCO1CON
NCO1CLK
N1EN
N1OE
N1PWS<2:0>
N1OUT
N1POL
—
—
—
—
—
N1PFM
0000 ---0 0000 ---0
0000 --00 0000 --00
—
N1CKS<1:0>
Legend:
Note 1:
2:
x= unknown, u= unchanged, q= value depends on condition, - = unimplemented, r= reserved. Shaded locations are unimplemented, read as ‘0’.
PIC16F1508/9 only.
Unimplemented, read as ‘1’.
2011-2013 Microchip Technology Inc.
DS40001609B-page 29
PIC16(L)F1508/9
TABLE 3-9:
SPECIAL FUNCTION REGISTER SUMMARY (CONTINUED)
Value on all
other
Resets
Value on
POR, BOR
Address
Name
Bit 7
Bit 6
Bit 5
Bit 4
Bit 3
Bit 2
Bit 1
Bit 0
Bank 10
50Ch
to
51Fh
—
Unimplemented
Unimplemented
Unimplemented
—
—
—
—
—
—
Bank 11
58Ch
to
59Fh
—
Bank 12
60Ch
to
—
610h
611h
PWM1DCL
PWM1DCH
PWM1DCL<7:6>
—
—
—
—
—
—
00-- ---- 00-- ----
xxxx xxxx uuuu uuuu
0000 ---- 0000 ----
00-- ---- 00-- ----
xxxx xxxx uuuu uuuu
0000 ---- 0000 ----
00-- ---- 00-- ----
xxxx xxxx uuuu uuuu
0000 ---- 0000 ----
00-- ---- 00-- ----
xxxx xxxx uuuu uuuu
0000 ---- 0000 ----
612h
613h
614h
615h
616h
617h
618h
619h
61Ah
61Bh
61Ch
PWM1DCH<7:0>
PWM1CON0 PWM1EN PWM1OE PWM1OUT PWM1POL
—
—
—
—
—
—
—
—
PWM2DCL
PWM2DCH
PWM2DCL<7:6>
—
—
PWM2DCH<7:0>
PWM2CON0 PWM2EN PWM2OE PWM2OUT PWM2POL
—
—
—
—
—
—
—
—
PWM3DCL
PWM3DCH
PWM3DCL<7:6>
—
—
PWM3DCH<7:0>
PWM3CON0 PWM3EN PWM3OE PWM3OUT PWM3POL
—
—
—
—
—
—
—
—
PWM4DCL
PWM4DCH
PWM4DCL<7:6>
—
—
PWM4DCH<7:0>
PWM4CON0 PWM4EN PWM4OE PWM4OUT PWM4POL
—
—
—
—
61Dh
to
—
Unimplemented
—
—
61Fh
Bank 13
68Ch
to
—
Unimplemented
—
—
690h
691h
CWG1DBR
CWG1DBF
CWG1CON0
CWG1CON1
CWG1CON2
—
—
—
—
CWG1DBR<5:0>
CWG1DBF<5:0>
--00 0000 --00 0000
--xx xxxx --xx xxxx
0000 0--0 0000 0--0
0000 -000 0000 -000
692h
693h
694h
695h
G1EN
G1ASDLB<1:0>
G1ASE G1ARSEN
G1OEB
G1OEA
G1POLB
—
G1POLA
—
—
G1CS0
G1ASDLA<1:0>
—
G1IS<2:0>
—
G1ASDC2 G1ASDC1 G1ASDSFLT G1ASDSCLC2 00-- --00 00-- --00
696h
to
—
Unimplemented
—
—
69Fh
Legend:
Note 1:
2:
x= unknown, u= unchanged, q= value depends on condition, - = unimplemented, r= reserved. Shaded locations are unimplemented, read as ‘0’.
PIC16F1508/9 only.
Unimplemented, read as ‘1’.
DS40001609B-page 30
2011-2013 Microchip Technology Inc.
PIC16(L)F1508/9
TABLE 3-9:
SPECIAL FUNCTION REGISTER SUMMARY (CONTINUED)
Value on all
other
Resets
Value on
POR, BOR
Address
Name
Bit 7
Bit 6
Bit 5
Bit 4
Bit 3
Bit 2
Bit 1
Bit 0
Banks 14-29
x0Ch/
x8Ch
—
x1Fh/
x9Fh
—
Unimplemented
—
—
—
Bank 30
F0Ch
to
F0Eh
—
Unimplemented
—
—
F0Fh
CLCDATA
CLC1CON
CLC1POL
CLC1SEL0
CLC1SEL1
CLC1GLS0
CLC1GLS1
CLC1GLS2
CLC1GLS3
CLC2CON
CLC2POL
CLC2SEL0
CLC2SEL1
CLC2GLS0
CLC2GLS1
CLC2GLS2
CLC2GLS3
CLC3CON
CLC3POL
CLC3SEL0
CLC3SEL1
CLC3GLS0
CLC3GLS1
CLC3GLS2
CLC3GLS3
CLC4CON
CLC4POL
CLC4SEL0
CLC4SEL1
CLC4GLS0
CLC4GLS1
CLC4GLS2
CLC4GLS3
—
—
—
LC1INTP
—
MLC4OUT MLC3OUT MLC2OUT
MLC1OUT ---- 0000 ---- 0000
F10h
F11h
F12h
F13h
F14h
F15h
F16h
F17h
F18h
F19h
F1Ah
F1Bh
F1Ch
F1Dh
F1Eh
F1Fh
F20h
F21h
F22h
F23h
F24h
F25h
F26h
F27h
F28h
F29h
F2Ah
F2Bh
F2Ch
F2Dh
F2Eh
F2Fh
LC1EN
LC1POL
—
LC1OE
—
LC1OUT
—
LC1INTN LC1MODE<2:0>
0000 0000 0000 0000
LC1G4POL LC1G3POL LC1G2POL LC1G1POL 0--- xxxx 0--- uuuu
LC1D2S<2:0>
LC1D4S<2:0>
—
—
LC1D1S<2:0>
LC1D3S<2:0>
-xxx -xxx -uuu -uuu
-xxx -xxx -uuu -uuu
—
LC1G1D4T LC1G1D4N LC1G1D3T LC1G1D3N LC1G1D2T LC1G1D2N LC1G1D1T
LC1G2D4T LC1G2D4N LC1G2D3T LC1G2D3N LC1G2D2T LC1G2D2N LC1G2D1T
LC1G3D4T LC1G3D4N LC1G3D3T LC1G3D3N LC1G3D2T LC1G3D2N LC1G3D1T
LC1G4D4T LC1G4D4N LC1G4D3T LC1G4D3N LC1G4D2T LC1G4D2N LC1G4D1T
LC1G1D1N xxxx xxxx uuuu uuuu
LC1G2D1N xxxx xxxx uuuu uuuu
LC1G3D1N xxxx xxxx uuuu uuuu
LC1G4D1N xxxx xxxx uuuu uuuu
LC2MODE<2:0> 0000 0000 0000 0000
LC2EN
LC2POL
—
LC2OE
—
LC2OUT
—
LC2INTP
—
LC2INTN
LC2G4POL LC2G3POL LC2G2POL LC2G1POL 0--- xxxx 0--- uuuu
LC2D2S<2:0>
LC2D4S<2:0>
—
—
LC2D1S<2:0>
LC2D3S<2:0>
-xxx -xxx -uuu -uuu
-xxx -xxx -uuu -uuu
—
LC2G1D4T LC2G1D4N LC2G1D3T LC2G1D3N LC2G1D2T LC2G1D2N LC2G1D1T
LC2G2D4T LC2G2D4N LC2G2D3T LC2G2D3N LC2G2D2T LC2G2D2N LC2G2D1T
LC2G3D4T LC2G3D4N LC2G3D3T LC2G3D3N LC2G3D2T LC2G3D2N LC2G3D1T
LC2G4D4T LC2G4D4N LC2G4D3T LC2G4D3N LC2G4D2T LC2G4D2N LC2G4D1T
LC2G1D1N xxxx xxxx uuuu uuuu
LC2G2D1N xxxx xxxx uuuu uuuu
LC2G3D1N xxxx xxxx uuuu uuuu
LC2G4D1N xxxx xxxx uuuu uuuu
LC3MODE<2:0> 0000 0000 0000 0000
LC3EN
LC3POL
—
LC3OE
—
LC3OUT
—
LC3INTP
—
LC3INTN
LC3G4POL LC3G3POL LC3G2POL LC3G1POL 0--- xxxx 0--- uuuu
LC3D2S<2:0>
LC3D4S<2:0>
—
—
LC3D1S<2:0>
LC3D3S<2:0>
-xxx -xxx -uuu -uuu
-xxx -xxx -uuu -uuu
—
LC3G1D4T LC3G1D4N LC3G1D3T LC3G1D3N LC3G1D2T LC3G1D2N LC3G1D1T
LC3G2D4T LC3G2D4N LC3G2D3T LC3G2D3N LC3G2D2T LC3G2D2N LC3G2D1T
LC3G3D4T LC3G3D4N LC3G3D3T LC3G3D3N LC3G3D2T LC3G3D2N LC3G3D1T
LC3G4D4T LC3G4D4N LC3G4D3T LC3G4D3N LC3G4D2T LC3G4D2N LC3G4D1T
LC3G1D1N xxxx xxxx uuuu uuuu
LC3G2D1N xxxx xxxx uuuu uuuu
LC3G3D1N xxxx xxxx uuuu uuuu
LC3G4D1N xxxx xxxx uuuu uuuu
LC4MODE<2:0> 0000 0000 0000 0000
LC4EN
LC4POL
—
LC4OE
—
LC4OUT
—
LC4INTP
—
LC4INTN
LC4G4POL LC4G3POL LC4G2POL LC4G1POL 0--- xxxx 0--- uuuu
LC4D2S<2:0>
LC4D4S<2:0>
—
—
LC4D1S<2:0>
LC4D3S<2:0>
-xxx -xxx -uuu -uuu
-xxx -xxx -uuu -uuu
—
LC4G1D4T LC4G1D4N LC4G1D3T LC4G1D3N LC4G1D2T LC4G1D2N LC4G1D1T
LC4G2D4T LC4G2D4N LC4G2D3T LC4G2D3N LC4G2D2T LC4G2D2N LC4G2D1T
LC4G3D4T LC4G3D4N LC4G3D3T LC4G3D3N LC4G3D2T LC4G3D2N LC4G3D1T
LC4G4D4T LC4G4D4N LC4G4D3T LC4G4D3N LC4G4D2T LC4G4D2N LC4G4D1T
LC4G1D1N xxxx xxxx uuuu uuuu
LC4G2D1N xxxx xxxx uuuu uuuu
LC4G3D1N xxxx xxxx uuuu uuuu
LC4G4D1N xxxx xxxx uuuu uuuu
F30h
to
—
Unimplemented
—
—
F6Fh
Legend:
Note 1:
2:
x= unknown, u= unchanged, q= value depends on condition, - = unimplemented, r= reserved. Shaded locations are unimplemented, read as ‘0’.
PIC16F1508/9 only.
Unimplemented, read as ‘1’.
2011-2013 Microchip Technology Inc.
DS40001609B-page 31
PIC16(L)F1508/9
TABLE 3-9:
SPECIAL FUNCTION REGISTER SUMMARY (CONTINUED)
Value on all
other
Resets
Value on
POR, BOR
Address
Name
Bit 7
Bit 6
Bit 5
Bit 4
Bit 3
Bit 2
Bit 1
Bit 0
Bank 31
F8Ch
—
FE3h
—
Unimplemented
—
—
—
FE4h
FE5h
FE6h
FE7h
FE8h
FE9h
FEAh
FEBh
STATUS_
SHAD
—
—
—
—
—
Z_SHAD
DC_SHAD
C_SHAD
---- -xxx ---- -uuu
xxxx xxxx uuuu uuuu
---x xxxx ---u uuuu
-xxx xxxx uuuu uuuu
xxxx xxxx uuuu uuuu
xxxx xxxx uuuu uuuu
xxxx xxxx uuuu uuuu
xxxx xxxx uuuu uuuu
WREG_
SHAD
Working Register Shadow
BSR_
SHAD
—
—
—
Bank Select Register Shadow
PCLATH_
SHAD
Program Counter Latch High Register Shadow
FSR0L_
SHAD
Indirect Data Memory Address 0 Low Pointer Shadow
Indirect Data Memory Address 0 High Pointer Shadow
Indirect Data Memory Address 1 Low Pointer Shadow
Indirect Data Memory Address 1 High Pointer Shadow
Unimplemented
FSR0H_
SHAD
FSR1L_
SHAD
FSR1H_
SHAD
—
FECh
FEDh
FEEh
FEFh
—
—
—
—
—
Current Stack Pointer
---1 1111 ---1 1111
xxxx xxxx uuuu uuuu
-xxx xxxx -uuu uuuu
STKPTR
TOSL
Top-of-Stack Low byte
Top-of-Stack High byte
—
TOSH
Legend:
Note 1:
2:
x= unknown, u= unchanged, q= value depends on condition, - = unimplemented, r= reserved. Shaded locations are unimplemented, read as ‘0’.
PIC16F1508/9 only.
Unimplemented, read as ‘1’.
DS40001609B-page 32
2011-2013 Microchip Technology Inc.
PIC16(L)F1508/9
3.3.2
COMPUTED GOTO
3.3
PCL and PCLATH
A computed GOTOis accomplished by adding an offset to
the program counter (ADDWF PCL). When performing a
table read using a computed GOTOmethod, care should
be exercised if the table location crosses a PCL memory
boundary (each 256-byte block). Refer to Application
Note AN556, “Implementing a Table Read” (DS00556).
The Program Counter (PC) is 15 bits wide. The low byte
comes from the PCL register, which is a readable and
writable register. The high byte (PC<14:8>) is not directly
readable or writable and comes from PCLATH. On any
Reset, the PC is cleared. Figure 3-4 shows the five
situations for the loading of the PC.
3.3.3
COMPUTED FUNCTION CALLS
FIGURE 3-4:
LOADING OF PC IN
A computed function CALLallows programs to maintain
tables of functions and provide another way to execute
state machines or look-up tables. When performing a
table read using a computed function CALL, care
should be exercised if the table location crosses a PCL
memory boundary (each 256-byte block).
DIFFERENT SITUATIONS
Instruction with
14
0
PCH
7
PCL
PCL as
PC
Destination
8
6
0
PCLATH
ALU Result
If using the CALLinstruction, the PCH<2:0> and PCL
registers are loaded with the operand of the CALL
instruction. PCH<6:3> is loaded with PCLATH<6:3>.
14
0
PCH
PCL
GOTO, CALL
PC
The CALLWinstruction enables computed calls by com-
bining PCLATH and W to form the destination address.
A computed CALLWis accomplished by loading the W
register with the desired address and executing CALLW.
The PCL register is loaded with the value of W and
PCH is loaded with PCLATH.
11
4
6
0
PCLATH
OPCODE <10:0>
14
0
0
0
PCH
7
PCL
CALLW
PC
8
6
0
3.3.4
BRANCHING
PCLATH
W
The branching instructions add an offset to the PC.
This allows relocatable code and code that crosses
page boundaries. There are two forms of branching,
BRW and BRA. The PC will have incremented to fetch
the next instruction in both cases. When using either
branching instruction, a PCL memory boundary may be
crossed.
14
PCH
PCL
PC
BRW
BRA
15
PC + W
14
PCH
PCL
If using BRW, load the W register with the desired
unsigned address and execute BRW. The entire PC will
be loaded with the address PC + 1 + W.
PC
15
PC + OPCODE <8:0>
If using BRA, the entire PC will be loaded with PC + 1 +,
the signed value of the operand of the BRAinstruction.
3.3.1
MODIFYING PCL
Executing any instruction with the PCL register as the
destination simultaneously causes the Program
Counter PC<14:8> bits (PCH) to be replaced by the
contents of the PCLATH register. This allows the entire
contents of the program counter to be changed by
writing the desired upper seven bits to the PCLATH
register. When the lower eight bits are written to the
PCL register, all 15 bits of the program counter will
change to the values contained in the PCLATH register
and those being written to the PCL register.
2011-2013 Microchip Technology Inc.
DS40001609B-page 33
PIC16(L)F1508/9
3.4.1
ACCESSING THE STACK
3.4
Stack
The stack is available through the TOSH, TOSL and
STKPTR registers. STKPTR is the current value of the
Stack Pointer. TOSH:TOSL register pair points to the
TOP of the stack. Both registers are read/writable. TOS
is split into TOSH and TOSL due to the 15-bit size of
the PC. To access the stack, adjust the value of
STKPTR, which will position TOSH:TOSL, then
read/write to TOSH:TOSL. STKPTR is 5 bits to allow
detection of overflow and underflow.
All devices have a 16-level x 15-bit wide hardware
stack (refer to Figures 3-5 through 3-8). The stack
space is not part of either program or data space. The
PC is PUSHed onto the stack when CALL or CALLW
instructions are executed or an interrupt causes a
branch. The stack is POPed in the event of a RETURN,
RETLWor a RETFIEinstruction execution. PCLATH is
not affected by a PUSH or POP operation.
The stack operates as a circular buffer if the STVREN
bit is programmed to ‘0‘ (Configuration Words). This
means that after the stack has been PUSHed sixteen
times, the seventeenth PUSH overwrites the value that
was stored from the first PUSH. The eighteenth PUSH
overwrites the second PUSH (and so on). The
STKOVF and STKUNF flag bits will be set on an Over-
flow/Underflow, regardless of whether the Reset is
enabled.
Note:
Care should be taken when modifying the
STKPTR while interrupts are enabled.
During normal program operation, CALL, CALLWand
Interrupts will increment STKPTR while RETLW,
RETURN, and RETFIEwill decrement STKPTR. At any
time STKPTR can be inspected to see how much stack
is left. The STKPTR always points at the currently used
place on the stack. Therefore, a CALL or CALLW will
increment the STKPTR and then write the PC, and a
return will unload the PC and then decrement the
STKPTR.
Note 1: There are no instructions/mnemonics
called PUSH or POP. These are actions
that occur from the execution of the
CALL, CALLW, RETURN, RETLW and
RETFIE instructions or the vectoring to
an interrupt address.
Reference Figure 3-5 through Figure 3-8 for examples
of accessing the stack.
FIGURE 3-5:
ACCESSING THE STACK EXAMPLE 1
Stack Reset Disabled
STKPTR = 0x1F
TOSH:TOSL
0x0F
0x0E
0x0D
0x0C
0x0B
0x0A
0x09
0x08
0x07
0x06
0x05
0x04
0x03
0x02
0x01
0x00
0x1F
(STVREN = 0)
Initial Stack Configuration:
After Reset, the stack is empty. The
empty stack is initialized so the Stack
Pointer is pointing at 0x1F. If the Stack
Overflow/Underflow Reset is enabled, the
TOSH/TOSL registers will return ‘0’. If
the Stack Overflow/Underflow Reset is
disabled, the TOSH/TOSL registers will
return the contents of stack address 0x0F.
Stack Reset Enabled
STKPTR = 0x1F
TOSH:TOSL
0x0000
(STVREN = 1)
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PIC16(L)F1508/9
FIGURE 3-6:
ACCESSING THE STACK EXAMPLE 2
0x0F
0x0E
0x0D
0x0C
0x0B
0x0A
0x09
0x08
0x07
0x06
0x05
0x04
0x03
0x02
0x01
This figure shows the stack configuration
after the first CALLor a single interrupt.
If a RETURN instruction is executed, the
return address will be placed in the
Program Counter and the Stack Pointer
decremented to the empty state (0x1F).
TOSH:TOSL
0x00
Return Address
STKPTR = 0x00
FIGURE 3-7:
ACCESSING THE STACK EXAMPLE 3
0x0F
0x0E
0x0D
0x0C
0x0B
0x0A
0x09
0x08
0x07
After seven CALLs or six CALLs and an
interrupt, the stack looks like the figure
on the left. A series of RETURNinstructions
will repeatedly place the return addresses
into the Program Counter and pop the stack.
STKPTR = 0x06
TOSH:TOSL
0x06
0x05
0x04
0x03
0x02
0x01
0x00
Return Address
Return Address
Return Address
Return Address
Return Address
Return Address
Return Address
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PIC16(L)F1508/9
FIGURE 3-8:
ACCESSING THE STACK EXAMPLE 4
0x0F
0x0E
0x0D
0x0C
0x0B
0x0A
0x09
0x08
0x07
0x06
0x05
0x04
0x03
0x02
0x01
0x00
Return Address
Return Address
Return Address
Return Address
Return Address
Return Address
Return Address
Return Address
Return Address
Return Address
Return Address
Return Address
Return Address
Return Address
Return Address
Return Address
When the stack is full, the next CALLor
an interrupt will set the Stack Pointer to
0x10. This is identical to address 0x00
so the stack will wrap and overwrite the
return address at 0x00. If the Stack
Overflow/Underflow Reset is enabled, a
Reset will occur and location 0x00 will
not be overwritten.
TOSH:TOSL
STKPTR = 0x10
3.4.2
OVERFLOW/UNDERFLOW RESET
If the STVREN bit in Configuration Words is
programmed to ‘1’, the device will be reset if the stack
is PUSHed beyond the sixteenth level or POPed
beyond the first level, setting the appropriate bits
(STKOVF or STKUNF, respectively) in the PCON
register.
3.5
Indirect Addressing
The INDFn registers are not physical registers. Any
instruction that accesses an INDFn register actually
accesses the register at the address specified by the
File Select Registers (FSR). If the FSRn address
specifies one of the two INDFn registers, the read will
return ‘0’ and the write will not occur (though Status bits
may be affected). The FSRn register value is created
by the pair FSRnH and FSRnL.
The FSR registers form a 16-bit address that allows an
addressing space with 65536 locations. These locations
are divided into three memory regions:
• Traditional Data Memory
• Linear Data Memory
• Program Flash Memory
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FIGURE 3-9:
INDIRECT ADDRESSING
0x0000
0x0000
Traditional
Data Memory
0x0FFF
0x0FFF
0x1000
0x1FFF
0x2000
Reserved
Linear
Data Memory
0x29AF
0x29B0
Reserved
0x0000
FSR
Address
Range
0x7FFF
0x8000
Program
Flash Memory
0xFFFF
0x7FFF
Note:
Not all memory regions are completely implemented. Consult device memory tables for memory limits.
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3.5.1
TRADITIONAL DATA MEMORY
The traditional data memory is a region from FSR
address 0x000 to FSR address 0xFFF. The addresses
correspond to the absolute addresses of all SFR, GPR
and common registers.
FIGURE 3-10:
TRADITIONAL DATA MEMORY MAP
Direct Addressing
From Opcode
Indirect Addressing
4
BSR
6
7
FSRxH
0
7
FSRxL
0
0
0
0
0
0
0
Location Select
Bank Select
Bank Select
Location Select
00000 00001 00010
11111
0x00
0x7F
Bank 0 Bank 1 Bank 2
Bank 31
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3.5.2
LINEAR DATA MEMORY
3.5.3
PROGRAM FLASH MEMORY
The linear data memory is the region from FSR
address 0x2000 to FSR address 0x29AF. This region is
a virtual region that points back to the 80-byte blocks of
GPR memory in all the banks.
To make constant data access easier, the entire
program Flash memory is mapped to the upper half of
the FSR address space. When the MSb of FSRnH is
set, the lower 15 bits are the address in program
memory which will be accessed through INDF. Only the
lower eight bits of each memory location is accessible
via INDF. Writing to the program Flash memory cannot
be accomplished via the FSR/INDF interface. All
instructions that access program Flash memory via the
FSR/INDF interface will require one additional
instruction cycle to complete.
Unimplemented memory reads as 0x00. Use of the
linear data memory region allows buffers to be larger
than 80 bytes because incrementing the FSR beyond
one bank will go directly to the GPR memory of the next
bank.
The 16 bytes of common memory are not included in
the linear data memory region.
FIGURE 3-12:
PROGRAM FLASH
MEMORY MAP
FIGURE 3-11:
LINEAR DATA MEMORY
MAP
7
7
0
0
FSRnH
FSRnL
7
1
7
0
0
FSRnH
FSRnL
0
0 1
Location Select
0x8000
0x0000
Location Select
0x2000
0x020
Bank 0
0x06F
0x0A0
Bank 1
0x0EF
0x120
Program
Flash
Memory
(low 8
bits)
Bank 2
0x16F
0xF20
Bank 30
0x7FFF
0xFFFF
0xF6F
0x29AF
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NOTES:
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4.0
DEVICE CONFIGURATION
Device configuration consists of Configuration Words,
Code Protection and Device ID.
4.1
Configuration Words
There are several Configuration Word bits that allow
different oscillator and memory protection options.
These are implemented as Configuration Word 1 at
8007h and Configuration Word 2 at 8008h.
Note:
The DEBUG bit in Configuration Words is
managed automatically by device
development tools including debuggers
and programmers. For normal device
operation, this bit should be maintained as
a ‘1’.
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4.2
Register Definitions: Configuration Words
REGISTER 4-1:
CONFIG1: CONFIGURATION WORD 1
R/P-1
FCMEN(1)
R/P-1
IESO(1)
R/P-1
R/P-1
BOREN<1:0>(2)
R/P-1
U-1
—
CLKOUTEN
bit 13
bit 8
R/P-1
bit 0
R/P-1
CP(3)
R/P-1
R/P-1
R/P-1
R/P-1
R/P-1
R/P-1
MCLRE
PWRTE
WDTE<1:0>
FOSC<2:0>
bit 7
Legend:
R = Readable bit
P = Programmable bit
‘1’ = Bit is set
U = Unimplemented bit, read as ‘1’
‘0’ = Bit is cleared
-n = Value when blank or after Bulk Erase
bit 13
bit 12
bit 11
FCMEN: Fail-Safe Clock Monitor Enable bit
1= Fail-Safe Clock Monitor is enabled(1)
0= Fail-Safe Clock Monitor is disabled
IESO: Internal External Switchover bit(1)
1= Internal/External Switchover (Two-Speed Start-up) mode is enabled
0= Internal/External Switchover mode is disabled
CLKOUTEN: Clock Out Enable bit
1= CLKOUT function is disabled. I/O function on the CLKOUT pin
0= CLKOUT function is enabled on the CLKOUT pin
bit 10-9
BOREN<1:0>: Brown-Out Reset Enable bits(2)
11= BOR enabled
10= BOR enabled during operation and disabled in Sleep
01= BOR controlled by SBOREN bit of the BORCON register
00= BOR disabled
bit 8
bit 7
Unimplemented: Read as ‘1’
CP: Code Protection bit(3)
1= Program memory code protection is disabled
0= Program memory code protection is enabled
bit 6
MCLRE: MCLR/VPP Pin Function Select bit
If LVP bit = 1:
This bit is ignored.
If LVP bit = 0:
1= MCLR/VPP pin function is MCLR; Weak pull-up enabled.
0= MCLR/VPP pin function is digital input; MCLR internally disabled; Weak pull-up under control of
WPUA3 bit.
bit 5
PWRTE: Power-Up Timer Enable bit
1= PWRT disabled
0= PWRT enabled
bit 4-3
WDTE<1:0>: Watchdog Timer Enable bits
11= WDT enabled
10= WDT enabled while running and disabled in Sleep
01= WDT controlled by the SWDTEN bit in the WDTCON register
00= WDT disabled
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REGISTER 4-1:
CONFIG1: CONFIGURATION WORD 1 (CONTINUED)
bit 2-0
FOSC<2:0>: Oscillator Selection bits
111= ECH:External clock, High-Power mode: on CLKIN pin
110= ECM: External clock, Medium-Power mode: on CLKIN pin
101= ECL: External clock, Low-Power mode: on CLKIN pin
100= INTOSC oscillator: I/O function on CLKIN pin
011= EXTRC oscillator: External RC circuit connected to CLKIN pin
010= HS oscillator: High-speed crystal/resonator connected between OSC1 and OSC2 pins
001= XT oscillator: Crystal/resonator connected between OSC1 and OSC2 pins
000= LP oscillator: Low-power crystal connected between OSC1 and OSC2 pins
Note 1: When FSCM is enabled, Two-Speed Start-up will be automatically enabled, regardless of the IESO bit value.
2: Enabling Brown-out Reset does not automatically enable Power-up Timer.
3: Once enabled, code-protect can only be disabled by bulk erasing the device.
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REGISTER 4-2:
CONFIG2: CONFIGURATION WORD 2
R/P-1
LVP(1)
R/P-1
DEBUG(3)
R/P-1
R/P-1
BORV(2)
R/P-1
U-1
—
LPBOR
STVREN
bit 13
bit 8
U-1
—
U-1
—
U-1
—
U-1
—
U-1
—
U-1
—
R/P-1
R/P-1
WRT<1:0>
bit 7
bit 0
Legend:
R = Readable bit
‘0’ = Bit is cleared
P = Programmable bit
‘1’ = Bit is set
U = Unimplemented bit, read as ‘1’
-n = Value when blank or after Bulk Erase
bit 13
bit 12
bit 11
bit 10
bit 9
LVP: Low-Voltage Programming Enable bit(1)
1= Low-voltage programming enabled
0= High-voltage on MCLR must be used for programming
DEBUG: In-Circuit Debugger Mode bit(3)
1= In-Circuit Debugger disabled, ICSPCLK and ICSPDAT are general purpose I/O pins
0= In-Circuit Debugger enabled, ICSPCLK and ICSPDAT are dedicated to the debugger
LPBOR: Low-Power BOR Enable bit
1= Low-Power Brown-out Reset is disabled
0= Low-Power Brown-out Reset is enabled
BORV: Brown-Out Reset Voltage Selection bit(2)
1= Brown-out Reset voltage (Vbor), low trip point selected
0= Brown-out Reset voltage (Vbor), high trip point selected
STVREN: Stack Overflow/Underflow Reset Enable bit
1= Stack Overflow or Underflow will cause a Reset
0= Stack Overflow or Underflow will not cause a Reset
bit 8-2
bit 1-0
Unimplemented: Read as ‘1’
WRT<1:0>: Flash Memory Self-Write Protection bits
4 kW Flash memory (PIC16(L)F1508 only)
11= Write protection off
10= 000h to 1FFh write protected, 200h to FFFh may be modified
01= 000h to 7FFh write protected, 800h to FFFh may be modified
00= 000h to FFFh write protected, no addresses may be modified
8 kW Flash memory (PIC16(L)F1509 only)
11= Write protection off
10= 000h to 01FFh write protected, 0200h to 1FFFh may be modified
01= 000h to 0FFFh write protected, 1000h to 1FFFh may be modified
00= 000h to 1FFFh write protected, no addresses may be modified
Note 1: The LVP bit cannot be programmed to ‘0’ when Programming mode is entered via LVP.
2: See Vbor parameter for specific trip point voltages.
3: The DEBUG bit in Configuration Words is managed automatically by device development tools including
debuggers and programmers. For normal device operation, this bit should be maintained as a ‘1’.
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4.3
Code Protection
Code protection allows the device to be protected from
unauthorized access. Internal access to the program
memory is unaffected by any code protection setting.
4.3.1
PROGRAM MEMORY PROTECTION
The entire program memory space is protected from
external reads and writes by the CP bit in Configuration
Words. When CP = 0, external reads and writes of
program memory are inhibited and a read will return all
‘0’s. The CPU can continue to read program memory,
regardless of the protection bit settings. Writing the
program memory is dependent upon the write
protection
setting.
See
Section 4.4
“Write
Protection” for more information.
4.4
Write Protection
Write protection allows the device to be protected from
unintended self-writes. Applications, such as
bootloader software, can be protected while allowing
other regions of the program memory to be modified.
The WRT<1:0> bits in Configuration Words define the
size of the program memory block that is protected.
4.5
User ID
Four memory locations (8000h-8003h) are designated as
ID locations where the user can store checksum or other
code identification numbers. These locations are
readable and writable during normal execution. See
Section 10.4 “User ID, Device ID and Configuration
Word Access” for more information on accessing these
memory locations. For more information on checksum
calculation, see the “PIC12(L)F1501/PIC16(L)F150X
Memory Programming Specification” (DS41573).
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4.6
Device ID and Revision ID
The memory location 8006h is where the Device ID and
Revision ID are stored. The upper nine bits hold the
Device ID. The lower five bits hold the Revision ID. See
Section 10.4 “User ID, Device ID and Configuration
Word Access” for more information on accessing
these memory locations.
Development tools, such as device programmers and
debuggers, may be used to read the Device ID and
Revision ID.
4.7
Register Definitions: Device ID
REGISTER 4-3:
DEVID: DEVICE ID REGISTER
R
R
R
R
R
R
R
R
R
R
DEV<8:3>
bit 13
bit 8
bit 0
R
R
R
R
DEV<2:0>
REV<4:0>
bit 7
Legend:
R = Readable bit
‘1’ = Bit is set
‘0’ = Bit is cleared
bit 13-5
DEV<8:0>: Device ID bits
DEVID<13:0> Values
Device
DEV<8:0>
REV<4:0>
PIC16F1508
PIC16LF1508
PIC16F1509
PIC16LF1509
10 1101 001
10 1101 111
10 1101 010
10 1110 000
x xxxx
x xxxx
x xxxx
x xxxx
bit 4-0
REV<4:0>: Revision ID bits
These bits are used to identify the revision (see Table under DEV<8:0> above).
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The oscillator module can be configured in one of the
following clock modes.
5.0
5.1
OSCILLATOR MODULE (WITH
FAIL-SAFE CLOCK MONITOR)
1. ECL – External Clock Low-Power mode
(0 MHz to 0.5 MHz)
Overview
2. ECM – External Clock Medium-Power mode
(0.5 MHz to 4 MHz)
The oscillator module has a wide variety of clock
sources and selection features that allow it to be used
in a wide range of applications while maximizing perfor-
mance and minimizing power consumption. Figure 5-1
illustrates a block diagram of the oscillator module.
3. ECH – External Clock High-Power mode
(4 MHz to 20 MHz)
4. LP – 32 kHz Low-Power Crystal mode.
5. XT – Medium Gain Crystal or Ceramic Resonator
Oscillator mode (up to 4 MHz)
Clock sources can be supplied from external oscillators,
quartz crystal resonators, ceramic resonators and
Resistor-Capacitor (RC) circuits. In addition, the system
clock source can be supplied from one of two internal
oscillators, with a choice of speeds selectable via
software. Additional clock features include:
6. HS – High Gain Crystal or Ceramic Resonator
mode (4 MHz to 20 MHz)
7. EXTRC – External Resistor-Capacitor
8. INTOSC – Internal oscillator (31 kHz to 16 MHz)
Clock Source modes are selected by the FOSC<2:0>
bits in the Configuration Words. The FOSC bits
determine the type of oscillator that will be used when
the device is first powered.
• Selectable system clock source between external
or internal sources via software.
• Two-Speed Start-up mode, which minimizes
latency between external oscillator start-up and
code execution.
The ECH, ECM, and ECL clock modes rely on an
external logic level signal as the device clock source.
The LP, XT, and HS clock modes require an external
crystal or resonator to be connected to the device.
Each mode is optimized for a different frequency range.
The EXTRC clock mode requires an external resistor
and capacitor to set the oscillator frequency.
• Fail-Safe Clock Monitor (FSCM) designed to
detect a failure of the external clock source (LP,
XT, HS, ECH, ECM, ECL or EXTRC modes) and
switch automatically to the internal oscillator.
• Oscillator Start-up Timer (OST) ensures stability
of crystal oscillator sources
The INTOSC internal oscillator block produces a low
and high-frequency clock source, designated
LFINTOSC and HFINTOSC. (See Internal Oscillator
Block, Figure 5-1). A wide selection of device clock
frequencies may be derived from these two clock
sources.
• Fast start-up oscillator allows internal circuits to
power-up and stabilize before switching to the 16
MHz HFINTOSC
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FIGURE 5-1:
SIMPLIFIED PIC® MCU CLOCK SOURCE BLOCK DIAGRAM
Rev. 10-000030A_A1
CLKIN/ OSC1/
SOSCI/ T1CKI
Sleep
Primary
Oscillator
(OSC)
Primary Clock
Secondary Clock(1)
INTOSC
(1)
FOSC
CLKOUT/ OSC2/
SOSCO/ T1G
Secondary
Oscillator
(SOSC)
to CPU and
Peripherals
IRCF<3:0>
HFINTOSC
4
16 MHz
8 MHz
Start-up
Control Logic
Clock
4 MHz
Control
2 MHz
16 MHz
Oscillator
1 MHz
HFINTOSC(1)
*500 kHz
*250 kHz
*125 kHz
62.5 kHz
*31.25 kHz
*31 kHz
3
2
SCS<1:0>
Fast Start-up
Oscillator
FOSC<2:0>
LFINTOSC
LFINTOSC(1)
31 kHz
Oscillator
to WDT, PWRT, and
other Peripherals
FRC
FRC(1)
600 kHz
to ADC and
other Peripherals
Oscillator
* Available with more than one IRCF selection
Note 1: See Section 5.2.2.4 “Peripheral Clock Sources”.
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The Oscillator Start-up Timer (OST) is disabled when
EC mode is selected. Therefore, there is no delay in
operation after a Power-On Reset (POR) or wake-up
from Sleep. Because the PIC® MCU design is fully
static, stopping the external clock input will have the
effect of halting the device while leaving all data intact.
Upon restarting the external clock, the device will
resume operation as if no time had elapsed.
5.2
Clock Source Types
Clock sources can be classified as external, internal or
peripheral.
External clock sources rely on external circuitry for the
clock source to function. Examples are: oscillator mod-
ules (ECH, ECM, ECL modes), quartz crystal resona-
tors or ceramic resonators (LP, XT and HS modes) and
Resistor-Capacitor (EXTRC) mode circuits.
FIGURE 5-2:
EXTERNAL CLOCK (EC)
MODE OPERATION
Internal clock sources are contained within the oscillator
module. The internal oscillator block has two internal
oscillators that are used to generate the internal system
clock sources: the 16 MHz High-Frequency Internal
Oscillator (HFINTOSC) and the 31 kHz Low-Frequency
Internal Oscillator (LFINTOSC).
OSC1/CLKIN
PIC® MCU
Clock from
Ext. System
The peripheral clock source is a nominal 600 kHz
internal RC oscillator, FRC. The FRC is traditionally
used with the ADC module, but is sometimes available
to other peripherals. See Section 5.2.2.4 “Peripheral
Clock Sources”.
OSC2/CLKOUT
I/O(1)
FOSC/4 or
Note 1: Output depends upon the CLKOUTEN bit of
the Configuration Words.
The system clock can be selected between external or
internal clock sources via the System Clock Select
(SCS) bits in the OSCCON register. See Section 5.3
“Clock Switching” for additional information.
5.2.1.2
LP, XT, HS Modes
The LP, XT and HS modes support the use of quartz
crystal resonators or ceramic resonators connected to
OSC1 and OSC2 (Figure 5-3). The three modes select
a low, medium or high gain setting of the internal
inverter-amplifier to support various resonator types
and speed.
5.2.1
EXTERNAL CLOCK SOURCES
An external clock source can be used as the device
system clock by performing one of the following
actions:
LP Oscillator mode selects the lowest gain setting of the
internal inverter-amplifier. LP mode current consumption
is the least of the three modes. This mode is designed to
drive only 32.768 kHz tuning-fork type crystals (watch
crystals).
• Program the FOSC<2:0> bits in the Configuration
Words to select an external clock source that will
be used as the default system clock upon a
device Reset.
• Write the SCS<1:0> bits in the OSCCON register
to switch the system clock source to:
XT Oscillator mode selects the intermediate gain
setting of the internal inverter-amplifier. XT mode
current consumption is the medium of the three modes.
This mode is best suited to drive resonators with a
medium drive level specification.
- Secondary oscillator during run-time, or
- An external clock source determined by the
value of the FOSC bits.
See Section 5.3 “Clock Switching” for more informa-
tion.
HS Oscillator mode selects the highest gain setting of the
internal inverter-amplifier. HS mode current consumption
is the highest of the three modes. This mode is best
suited for resonators that require a high drive setting.
5.2.1.1
EC Mode
The External Clock (EC) mode allows an externally
generated logic level signal to be the system clock
source. When operating in this mode, an external clock
source is connected to the OSC1 input.
OSC2/CLKOUT is available for general purpose I/O or
CLKOUT. Figure 5-2 shows the pin connections for EC
mode.
Figure 5-3 and Figure 5-4 show typical circuits for
quartz crystal and ceramic resonators, respectively.
EC mode has three power modes to select from through
the FOSC bits in the Configuration Words:
• ECH – High-power, 4-20 MHz
• ECM – Medium-power, 0.5-4 MHz
• ECL – Low-power, 0-0.5 MHz
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FIGURE 5-3:
QUARTZ CRYSTAL
OPERATION (LP, XT OR
HS MODE)
FIGURE 5-4:
CERAMIC RESONATOR
OPERATION
(XT OR HS MODE)
PIC® MCU
PIC® MCU
OSC1/CLKIN
OSC1/CLKIN
C1
C1
To Internal
Logic
To Internal
Logic
Quartz
Crystal
(2)
Sleep
RF
(3)
(2)
RP
RF
Sleep
OSC2/CLKOUT
(1)
C2
RS
OSC2/CLKOUT
(1)
C2
RS
Ceramic
Resonator
Note 1: A series resistor (RS) may be required for
Note 1: A series resistor (RS) may be required for
quartz crystals with low drive level.
ceramic resonators with low drive level.
2: The value of RF varies with the Oscillator mode
selected (typically between 2 M to 10 M.
2: The value of RF varies with the Oscillator mode
selected (typically between 2 M to 10 M.
3: An additional parallel feedback resistor (RP)
may be required for proper ceramic resonator
operation.
Note 1: Quartz
crystal
characteristics
vary
according to type, package and
manufacturer. The user should consult the
manufacturer data sheets for specifications
and recommended application.
5.2.1.3
Oscillator Start-up Timer (OST)
If the oscillator module is configured for LP, XT or HS
modes, the Oscillator Start-up Timer (OST) counts
1024 oscillations from OSC1. This occurs following a
Power-On Reset (POR) and when the Power-up Timer
(PWRT) has expired (if configured), or a wake-up from
Sleep. During this time, the program counter does not
increment and program execution is suspended,
unless either FSCM or Two-Speed Start-Up are
enabled. In this case, code will continue to execute at
the selected INTOSC frequency while the OST is
counting. The OST ensures that the oscillator circuit,
using a quartz crystal resonator or ceramic resonator,
has started and is providing a stable system clock to
the oscillator module.
2: Always verify oscillator performance over
the VDD and temperature range that is
expected for the application.
3: For oscillator design assistance, reference
the following Microchip Applications Notes:
• AN826, “Crystal Oscillator Basics and
Crystal Selection for rfPIC® and PIC®
Devices” (DS00826)
• AN849, “Basic PIC® Oscillator Design”
(DS00849)
• AN943, “Practical PIC® Oscillator
Analysis and Design” (DS00943)
• AN949, “Making Your Oscillator Work”
(DS00949)
In order to minimize latency between external oscillator
start-up and code execution, the Two-Speed Clock
Start-up mode can be selected (see Section 5.4
“Two-Speed Clock Start-up Mode”).
DS40001609B-page 50
2011-2013 Microchip Technology Inc.
PIC16(L)F1508/9
5.2.1.4
Secondary Oscillator
5.2.1.5
External RC Mode
The secondary oscillator is a separate crystal oscillator
that is associated with the Timer1 peripheral. It is opti-
mized for timekeeping operations with a 32.768 kHz
crystal connected between the SOSCO and SOSCI
device pins.
The External Resistor-Capacitor (EXTRC) mode
supports the use of an external RC circuit. This allows the
designer maximum flexibility in frequency choice while
keeping costs to a minimum when clock accuracy is not
required.
The secondary oscillator can be used as an alternate
system clock source and can be selected during
run-time using clock switching. Refer to Section 5.3
“Clock Switching” for more information.
The RC circuit connects to OSC1. OSC2/CLKOUT is
available for general purpose I/O or CLKOUT. The
function of the OSC2/CLKOUT pin is determined by the
CLKOUTEN bit in Configuration Words.
Figure 5-6 shows the External RC mode connections.
FIGURE 5-5:
QUARTZ CRYSTAL
OPERATION
FIGURE 5-6:
EXTERNAL RC MODES
(SECONDARY
OSCILLATOR)
VDD
PIC® MCU
REXT
PIC® MCU
OSC1/CLKIN
Internal
Clock
SOSCI
CEXT
VSS
C1
C2
To Internal
Logic
32.768 kHz
Quartz
Crystal
OSC2/CLKOUT
FOSC/4 or I/O(1)
SOSCO
Recommended values: 10 k REXT 100 k, <3V
3 k REXT 100 k, 3-5V
CEXT > 20 pF, 2-5V
Note 1: Output depends upon the CLKOUTEN bit of
Note 1: Quartz
crystal
characteristics
vary
the Configuration Words.
according to type, package and
manufacturer. The user should consult the
manufacturer data sheets for specifications
and recommended application.
The RC oscillator frequency is a function of the supply
voltage, the resistor (REXT) and capacitor (CEXT) values
and the operating temperature. Other factors affecting
the oscillator frequency are:
2: Always verify oscillator performance over
the VDD and temperature range that is
expected for the application.
• threshold voltage variation
• component tolerances
• packaging variations in capacitance
3: For oscillator design assistance, reference
the following Microchip Applications Notes:
The user also needs to take into account variation due
to tolerance of the external RC components used.
• AN826, “Crystal Oscillator Basics and
Crystal Selection for rfPIC® and PIC®
Devices” (DS00826)
• AN849, “Basic PIC® Oscillator Design”
(DS00849)
• AN943, “Practical PIC® Oscillator
Analysis and Design” (DS00943)
• AN949, “Making Your Oscillator Work”
(DS00949)
• TB097, “Interfacing a Micro Crystal
MS1V-T1K 32.768 kHz Tuning Fork
Crystal to a PIC16F690/SS” (DS91097)
• AN1288, “Design Practices for
Low-Power External Oscillators”
(DS01288)
2011-2013 Microchip Technology Inc.
DS40001609B-page 51
PIC16(L)F1508/9
5.2.2
INTERNAL CLOCK SOURCES
5.2.2.2
LFINTOSC
The device may be configured to use the internal oscil-
lator block as the system clock by performing one of the
following actions:
The Low-Frequency Internal Oscillator (LFINTOSC) is
a 31 kHz internal clock source.
The output of the LFINTOSC connects to a multiplexer
(see Figure 5-1). Select 31 kHz, via software, using the
IRCF<3:0> bits of the OSCCON register. See
Section 5.2.2.6 “Internal Oscillator Clock Switch
Timing” for more information. The LFINTOSC is also
the frequency for the Power-up Timer (PWRT),
Watchdog Timer (WDT) and Fail-Safe Clock Monitor
(FSCM).
• Program the FOSC<2:0> bits in Configuration
Words to select the INTOSC clock source, which
will be used as the default system clock upon a
device Reset.
• Write the SCS<1:0> bits in the OSCCON register
to switch the system clock source to the internal
oscillator during run-time. See Section 5.3
“Clock Switching”for more information.
The LFINTOSC is enabled by selecting 31 kHz
(IRCF<3:0> bits of the OSCCON register = 000) as the
system clock source (SCS bits of the OSCCON
register = 1x), or when any of the following are
enabled:
In INTOSC mode, OSC1/CLKIN is available for general
purpose I/O. OSC2/CLKOUT is available for general
purpose I/O or CLKOUT.
The function of the OSC2/CLKOUT pin is determined
by the CLKOUTEN bit in Configuration Words.
• Configure the IRCF<3:0> bits of the OSCCON
register for the desired LF frequency, and
The internal oscillator block has two independent
oscillators that provides the internal system clock
source.
• FOSC<2:0> = 100, or
• Set the System Clock Source (SCS) bits of the
OSCCON register to ‘1x’.
1. The HFINTOSC (High-Frequency Internal
Oscillator) is factory calibrated and operates at
16 MHz.
Peripherals that use the LFINTOSC are:
• Power-up Timer (PWRT)
• Watchdog Timer (WDT)
2. The LFINTOSC (Low-Frequency Internal
Oscillator) operates at 31 kHz.
• Fail-Safe Clock Monitor (FSCM)
The Low-Frequency Internal Oscillator Ready bit
(LFIOFR) of the OSCSTAT register indicates when the
LFINTOSC is running.
5.2.2.1
HFINTOSC
The High-Frequency Internal Oscillator (HFINTOSC) is
a factory calibrated 16 MHz internal clock source.
5.2.2.3
FRC
The output of the HFINTOSC connects to a postscaler
and multiplexer (see Figure 5-1). The frequency derived
from the HFINTOSC can be selected via software using
the IRCF<3:0> bits of the OSCCON register. See
Section 5.2.2.6 “Internal Oscillator Clock Switch
Timing” for more information.
The FRC clock is an uncalibrated, nominal 600 kHz
peripheral clock source.
The FRC is automatically turned on by the peripherals
requesting the FRC clock.
The FRC clock continues to run during Sleep.
The HFINTOSC is enabled by:
• Configure the IRCF<3:0> bits of the OSCCON
register for the desired HF frequency, and
• FOSC<2:0> = 100, or
• Set the System Clock Source (SCS) bits of the
OSCCON register to ‘1x’.
A fast start-up oscillator allows internal circuits to
power-up and stabilize before switching to HFINTOSC.
The High-Frequency Internal Oscillator Ready bit
(HFIOFR) of the OSCSTAT register indicates when the
HFINTOSC is running.
The High-Frequency Internal Oscillator Stable bit
(HFIOFS) of the OSCSTAT register indicates when the
HFINTOSC is running within 0.5% of its final value.
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PIC16(L)F1508/9
5.2.2.4
Peripheral Clock Sources
5.2.2.5
Internal Oscillator Frequency
Selection
The clock sources described in this chapter and the
Timer’s are available to different peripherals. Table 5-1
lists the clocks and timers available for each peripheral.
The system clock speed can be selected via software
using the Internal Oscillator Frequency Select bits
IRCF<3:0> of the OSCCON register.
The postscaled output of the 16 MHz HFINTOSC and
31 kHz LFINTOSC connect to a multiplexer (see
Figure 5-1). The Internal Oscillator Frequency Select
bits IRCF<3:0> of the OSCCON register (Register 5-1)
select the frequency output of the internal oscillators.
TABLE 5-1:
PERIPHERAL CLOCK
SOURCES
Note:
Following any Reset, the IRCF<3:0> bits
of the OSCCON register are set to ‘0111’
and the frequency selection is set to
500 kHz. The user can modify the IRCF
bits to select a different frequency.
ADC
CLC
X
X
X
X
X
X
X
X
X
X
X
X
X
COMP
CWG
X
X
X
X
X
The IRCF<3:0> bits of the OSCCON register allow
duplicate selections for some frequencies. These dupli-
cate choices can offer system design trade-offs. Lower
power consumption can be obtained when changing
oscillator sources for a given frequency. Faster transi-
tion times can be obtained between frequency changes
that use the same oscillator source.
EUSART
MSSP
NCO
X
X
X
PWM
X
PWRT
TMR0
TMR1
TMR2
WDT
X
X
X
X
X
X
5.2.2.6
Internal Oscillator Clock Switch
Timing
X
When switching between the HFINTOSC and the
LFINTOSC, the new oscillator may already be shut
down to save power (see Figure 5-7). If this is the case,
there is a delay after the IRCF<3:0> bits of the
OSCCON register are modified before the frequency
selection takes place. The OSCSTAT register will
reflect the current active status of the HFINTOSC and
LFINTOSC oscillators. The sequence of a frequency
selection is as follows:
1. IRCF<3:0> bits of the OSCCON register are
modified.
2. If the new clock is shut down, a clock start-up
delay is started.
3. Clock switch circuitry waits for a falling edge of
the current clock.
4. The current clock is held low and the clock
switch circuitry waits for a rising edge in the new
clock.
5. The new clock is now active.
6. The OSCSTAT register is updated as required.
7. Clock switch is complete.
See Figure 5-7 for more details.
If the internal oscillator speed is switched between two
clocks of the same source, there is no start-up delay
before the new frequency is selected. Clock switching
time delays are shown in Table 5-3.
Start-up delay specifications are located in Table 29-8,
“Oscillator Parameters”.
2011-2013 Microchip Technology Inc.
DS40001609B-page 53
PIC16(L)F1508/9
FIGURE 5-7:
INTERNAL OSCILLATOR SWITCH TIMING
HFINTOSC
LFINTOSC (FSCM and WDT disabled)
HFINTOSC
Oscillator Delay(1)
2-cycle Sync
Running
LFINTOSC
0
0
IRCF <3:0>
System Clock
HFINTOSC
LFINTOSC (Either FSCM or WDT enabled)
HFINTOSC
2-cycle Sync
Running
LFINTOSC
IRCF <3:0>
0
0
System Clock
LFINTOSC
HFINTOSC
LFINTOSC turns off unless WDT or FSCM is enabled(2)
Running
LFINTOSC
Oscillator Delay(1)
2-cycle Sync
HFINTOSC
IRCF <3:0>
= 0
0
System Clock
Note 1: See Table 5-3, “Oscillator Switching Delays” for more information.
2: LFINTOSC will continue to run if a peripheral has selected it as the clock source. See
Section 5.2.2.4 “Peripheral Clock Sources”.
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PIC16(L)F1508/9
When Fail-Safe Clock Monitor and/or Two-Speed
Start-up are enabled, (FCMEN = 1 and/or IESO = 1),
the device will operate using the internal oscillator
(INTOSC) selected by the IRCF<3:0> bits, whenever
OSTS = 0. When the OST period expires,
(OSTS = 1), the system clock will switch to the external
oscillator selected.
5.3
Clock Switching
The system clock source can be switched between
external and internal clock sources via software using
the System Clock Select (SCS) bits of the OSCCON
register. The following clock sources can be selected
using the SCS bits:
• Default system oscillator determined by FOSC
bits in Configuration Words
When Fail-Safe Clock Monitor and Two-Speed
Start-up are disabled, (FCMEN = 0and IESO = 0), the
device will be held in Reset while OSTS = 0. When
OST period expires, (OSTS = 1), Reset will be
released and execution will begin 10 FOSC cycles later
using the external oscillator selected.
• Secondary oscillator 32 kHz crystal
• Internal Oscillator Block (INTOSC)
5.3.1
SYSTEM CLOCK SELECT (SCS)
BITS
For definition of the OSTS bit with clock sources other
than external oscillator modes (HS, XT or LP), see
Table 5-2.
The System Clock Select (SCS) bits of the OSCCON
register selects the system clock source that is used for
the CPU and peripherals.
The OSTS bit does not reflect the status of the
secondary oscillator.
• When the SCS bits of the OSCCON register = 00,
the system clock source is determined by value of
the FOSC<2:0> bits in the Configuration Words.
TABLE 5-2:
OSTS BIT DEFINITION
SCS<1:0> bits
• When the SCS bits of the OSCCON register = 01,
the system clock source is the secondary
oscillator.
FOSC<2:0>
selection
00
01
1x
• When the SCS bits of the OSCCON register = 1x,
the system clock source is chosen by the internal
oscillator frequency selected by the IRCF<3:0>
bits of the OSCCON register. After a Reset, the
SCS bits of the OSCCON register are always
cleared.
OSTS value
INTOSC
0
1
0
0
0
0
ECH, ECM, ECL,
EXTRC
0
HS, XT, LP
normal*
0
Note:
Any automatic clock switch, which may
occur from Two-Speed Start-up or
Fail-Safe Clock Monitor, does not update
the SCS bits of the OSCCON register. The
user can monitor the OSTS bit of the
OSCSTAT register to determine the current
system clock source. See Table 5-2.
* Normal function for oscillator modes (OSTS = 0),
while OST counting (OSTS = 1), after OST count
has expired.
5.3.3
SECONDARY OSCILLATOR
The secondary oscillator is a separate crystal oscillator
associated with the Timer1 peripheral. It is optimized
for timekeeping operations with a 32.768 kHz crystal
connected between the SOSCO and SOSCI device
pins.
When switching between clock sources, a delay is
required to allow the new clock to stabilize. These oscil-
lator delays are shown in Table 5-3.
5.3.2
OSCILLATOR START-UP TIMER
STATUS (OSTS) BIT
The secondary oscillator is enabled using the
T1OSCEN control bit in the T1CON register. See
Section 19.0 “Timer1 Module with Gate Control” for
more information about the Timer1 peripheral.
The Oscillator Start-up Timer Status (OSTS) bit in the
OSCSTAT register has different definitions that are
dependent on the FOSC bit selection in the
Configuration Word. Table 5-2 defines the OSTS bit
value for the FOSC selections.
5.3.4
SECONDARY OSCILLATOR READY
(SOSCR) BIT
The user must ensure that the secondary oscillator is
ready to be used before it is selected as a system clock
source. The Secondary Oscillator Ready (SOSCR) bit
of the OSCSTAT register indicates whether the
secondary oscillator is ready to be used. After the
SOSCR bit is set, the SCS bits can be configured to
select the secondary oscillator.
The normal function of the OSTS bit is when
FOSC<2:0> selects one of the external oscillator
modes, HS, XT or LP, while the OST is counting pulses
on the OSC1 pin from the external oscillator,
OSTS = 0. When the OST has counted 1024 pulses,
the OSTS bit should be set, OSTS = 1, indicating the
oscillator is stable and ready to be used.
2011-2013 Microchip Technology Inc.
DS40001609B-page 55
PIC16(L)F1508/9
5.4.1
TWO-SPEED START-UP MODE
CONFIGURATION
5.4
Two-Speed Clock Start-up Mode
Two-Speed Start-up mode provides additional power
savings by minimizing the latency between external oscil-
lator start-up and code execution. In applications that
make heavy use of the Sleep mode, Two-Speed Start-up
will remove the external oscillator start-up time from the
time spent awake and can reduce the overall power con-
sumption of the device. This mode allows the application
to wake-up from Sleep, perform a few instructions using
the INTOSC internal oscillator block as the clock source
and go back to Sleep without waiting for the external
oscillator to become stable.
Two-Speed Start-up mode is configured by the following
settings:
• IESO (of the Configuration Words) = 1;
Internal/External Switchover bit (Two-Speed
Start-up mode enabled).
• SCS (of the OSCCON register) = 00.
• FOSC<2:0> bits in the Configuration Words
configured for LP, XT or HS mode.
Two-Speed Start-up mode is entered after:
• Power-On Reset (POR) and, if enabled, after
Power-up Timer (PWRT) has expired, or
Two-Speed Start-up provides benefits when the oscilla-
tor module is configured for LP, XT, or HS modes. The
Oscillator Start-up Timer (OST) is enabled for these
modes and must count 1024 oscillations before the oscil-
lator can be used as the system clock source.
• Wake-up from Sleep.
Note:
When FSCM is enabled, Two-Speed
Start-up will automatically be enabled.
If the oscillator module is configured for any mode
other than LP, XT or HS mode, then Two-Speed
Start-up is disabled. This is because the external clock
oscillator does not require any stabilization time after
POR or an exit from Sleep.
5.4.2
TWO-SPEED START-UP
SEQUENCE
1. Wake-up from Power-on Reset or Sleep.
2. Instructions begin execution by the internal
oscillator at the frequency set in the IRCF<3:0>
bits of the OSCCON register.
3. OST enabled to count 1024 clock cycles.
4. OST timed out, wait for falling edge of the
internal oscillator.
If the OST count reaches 1024 before the device enters
Sleep mode, the OSTS bit of the OSCSTAT register is
set and program execution switches to the external oscil-
lator. However, the system may never operate from the
external oscillator if the time spent awake is very short.
Note:
Executing a SLEEP instruction will abort
the oscillator start-up time and will cause
the OSTS bit of the OSCSTAT register to
remain clear.
5. OSTS is set.
6. System clock held low until the next falling edge
of new clock (LP, XT or HS mode).
7. System clock is switched to external clock
source.
5.4.3
CHECKING TWO-SPEED CLOCK
STATUS
Checking the state of the OSTS bit of the OSCSTAT
register will confirm if the CPU is running from the
external clock source, as defined by the FOSC<2:0>
bits in the Configuration Words, or the internal oscilla-
tor. See Table 5-2.
TABLE 5-3:
Switch From
OSCILLATOR SWITCHING DELAYS
Switch To
Oscillator Delay
LFINTOSC
1 cycle of each clock source
2 s (approx.)
HFINTOSC
Any clock source
ECH, ECM, ECL, EXTRC
LP, XT, HS
2 cycles
1024 Clock Cycles (OST)
1024 Secondary Oscillator Cycles
Secondary Oscillator
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PIC16(L)F1508/9
FIGURE 5-8:
TWO-SPEED START-UP
INTOSC
TOST
OSC1
0
1
1022 1023
OSC2
Program Counter
PC - N
PC + 1
PC
System Clock
2011-2013 Microchip Technology Inc.
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PIC16(L)F1508/9
5.5.3
FAIL-SAFE CONDITION CLEARING
5.5
Fail-Safe Clock Monitor
When a Fail-Safe condition exists, the user must take
the following actions to clear the condition before
returning to normal operation with the external source.
The Fail-Safe Clock Monitor (FSCM) allows the device
to continue operating should the external oscillator or
external clock fail. If an oscillator mode is selected, the
FSCM can detect oscillator failure any time after the
Oscillator Start-up Timer (OST) has expired. When an
external clock mode is selected, the FSCM can detect
failure as soon as the device is released from Reset.
The next sections describe how to clear the Fail-Safe
condition for specific clock selections (FOSC bits) and
clock switching modes (SCS bit settings).
5.5.3.1
External Oscillator with
SCS<1:0> = 00
FSCM is enabled by setting the FCMEN bit in the
Configuration Words. The FSCM is applicable to external
oscillator modes (LP, XT, HS) and external clock modes
(ECH, ECM, ECL, EXTRC) and the Secondary Oscillator
(SOSC).
When a Fail-Safe condition occurs with the FOSC bits
selecting external oscillator (FOSC<2:0> = HS, XT, LP)
and the clock switch has been selected to run from the
FOSC selection (SCS<1:0> = 00), the condition is
cleared by performing the following procedure.
FIGURE 5-9:
FSCM BLOCK DIAGRAM
When SCS<1:0> = 00 (Running from FOSC selection)
SCS<1:0> = 1x:
Clock Monitor
Latch
External
Clock
S
Q
Change the SCS bits in the OSCCON register
to select the internal oscillator block. This resets
the OST timer and allows it to operate again.
LFINTOSC
Oscillator
÷ 64
R
Q
OSFIF = 0:
Clear the OSFIF bit in the PIR2 register.
SCS<1:0> = 00:
31 kHz
(~32 s)
488 Hz
(~2 ms)
Change the SCS bits in the OSCCON register
to select the FOSC Configuration Word clock
selection. This will start the OST. The CPU will
continue to operate from the internal oscillator
until the OST count is reached. When OST
expires, the clock module will switch to the
external oscillator and the Fail-Safe condition
will be cleared.
Sample Clock
Clock
Failure
Detected
5.5.1
FAIL-SAFE DETECTION
The FSCM module detects a failed oscillator by
monitoring falling clock edges and using LFINTOSC as a
time base. See Figure 5-9. Detection of a failed oscillator
will take 32 to 96 cycles of the LFINTOSC. Figure 5-10
shows a timing diagram of the FSCM module.
If the Fail-Safe condition still exists, the OSFIF bit will
again be set by hardware.
5.5.3.2
External Clock with SCS<1:0> = 00
When a Fail-Safe condition occurs with the FOSC bits
selecting external clock (FOSC<2:0> = ECH, ECM,
ECL, EXTRC) and the clock switch has selected to run
from the FOSC selection (SCS<1:0> = 00), the condi-
tion is cleared by performing the following procedure.
5.5.2
FAIL-SAFE OPERATION
When the external clock fails, the FSCM switches the
CPU clock to an internal clock source and sets the OSFIF
bit of the PIR2 register. The internal clock source is
determined by the IRCF<3:0> bits in the OSCCON
register.
When SCS<1:0> = 00 (Running from FOSC selection)
SCS<1:0> = 1x:
When the OSFIF bit is set, an interrupt will be generated,
if the OSFIE bit in the PIE2 register is enabled. The user’s
firmware in the Interrupt Service Routine (ISR) can then
take steps to mitigate the problems that may arise from
the failed clock.
Change the SCS bits in the OSCCON register
to select the internal oscillator block. This resets
the OST timer and allows it to operate again.
OSFIF = 0:
The system clock will continue to be sourced from the
internal clock source until the fail-safe condition has
been cleared, see Section 5.5.3 “Fail-Safe Condition
Clearing”.
Clear the OSFIF bit in the PIR2 register.
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PIC16(L)F1508/9
SCS<1:0> = 00:
Change the SCS bits in the OSCCON register
SCS<1:0> = 01:
Change the SCS bits in the OSCCON register
to select the secondary oscillator. The clock
module will immediately switch to the
secondary oscillator and the fail-safe condition
will be cleared.
to select the FOSC Configuration Word clock
selection. Since the OST is not applicable with
external clocks, the clock module will
immediately switch to the external clock, and
the fail-safe condition will be cleared.
If the Fail-Safe condition still exists, the OSFIF bit will
again be set by hardware.
If the Fail-Safe condition still exists, the OSFIF bit will
again be set by hardware.
5.5.4
RESET OR WAKE-UP FROM SLEEP
5.5.3.3
Secondary Oscillator with
SCS<1:0> = 01
The FSCM is designed to detect external oscillator or
external clock failures.
When a Fail-Safe condition occurs with the clock switch
selected to run from the Secondary Oscillator selection
(SCS<1:0> = 01), regardless of the FOSC selection,
the condition is cleared by performing the following pro-
cedure.
When FSCM is used with an external oscillator, the
Oscillator Start-up Timer (OST) count must expire
before the FSCM becomes active. The OST is used
after waking up from Sleep and after any type of Reset.
When the FSCM is used with external clocks, the OST
is not used and the FSCM will be active as soon as the
Reset or wake-up has completed.
SCS<1:0> = 01 (Secondary Oscillator)
SCS<1:0> = 1x:
When the FSCM is enabled, the Two-Speed Start-up is
also enabled. Therefore, the device will always be exe-
cuting code while the OST is operating.
Change the SCS bits in the OSCCON register
to select the internal oscillator block.
OSFIF = 0:
Note:
Due to the wide range of oscillator start-up
times, the Fail-Safe circuit is not active
during oscillator start-up (i.e., after exiting
Reset or Sleep).
Clear the OSFIF bit in the PIR2 register.
Read SOSCR:
The OST is not used with the secondary
oscillator, therefore, the user must determine if
the secondary oscillator is ready by monitoring
the SOSCR bit in the OSCSTAT register.
When the SOSCR bit is set, the secondary
oscillator is ready.
FIGURE 5-10:
FSCM TIMING DIAGRAM
Sample Clock
Oscillator
Failure
System
Clock
Output
Clock Monitor Output
(Q)
Failure
Detected
OSFIF
Test
Test
Test
Note:
The system clock is normally at a much higher frequency than the sample clock. The relative frequencies in
this example have been chosen for clarity.
2011-2013 Microchip Technology Inc.
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PIC16(L)F1508/9
5.6
Register Definitions: Oscillator Control
REGISTER 5-1:
OSCCON: OSCILLATOR CONTROL REGISTER
R/W-0/0 R/W-1/1 R/W-1/1 R/W-1/1
IRCF<3:0>
U-0
—
U-0
—
R/W-0/0
R/W-0/0
SCS<1:0>
bit 7
bit 0
Legend:
R = Readable bit
W = Writable bit
U = Unimplemented bit, read as ‘0’
-n/n = Value at POR and BOR/Value at all other Resets
u = Bit is unchanged
‘1’ = Bit is set
x = Bit is unknown
‘0’ = Bit is cleared
bit 7
Unimplemented: Read as ‘0’
bit 6-3
IRCF<3:0>: Internal Oscillator Frequency Select bits
1111= 16 MHz
1110= 8 MHz
1101= 4 MHz
1100= 2 MHz
1011= 1 MHz
1010= 500 kHz(1)
1001= 250 kHz(1)
1000= 125 kHz(1)
0111= 500 kHz (default upon Reset)
0110= 250 kHz
0101= 125 kHz
0100= 62.5 kHz
001x= 31.25 kHz
000x= 31 kHz LF
bit 2
Unimplemented: Read as ‘0’
bit 1-0
SCS<1:0>: System Clock Select bits
1x= Internal oscillator block
01= Secondary oscillator
00= Clock determined by FOSC<2:0> in Configuration Words.
Note 1: Duplicate frequency derived from HFINTOSC.
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PIC16(L)F1508/9
REGISTER 5-2:
OSCSTAT: OSCILLATOR STATUS REGISTER
R-1/q
SOSCR
bit 7
U-0
—
R-q/q
R-0/q
U-0
—
U-0
—
R-0/q
R-0/q
OSTS
HFIOFR
LFIOFR
HFIOFS
bit 0
Legend:
R = Readable bit
u = Bit is unchanged
‘1’ = Bit is set
W = Writable bit
x = Bit is unknown
‘0’ = Bit is cleared
U = Unimplemented bit, read as ‘0’
-n/n = Value at POR and BOR/Value at all other Resets
q = Conditional
bit 7
SOSCR: Secondary Oscillator Ready bit
If T1OSCEN = 1:
1= Secondary oscillator is ready
0= Secondary oscillator is not ready
If T1OSCEN = 0:
1= Timer1 clock source is always ready
bit 6
bit 5
Unimplemented: Read as ‘0’
OSTS: Oscillator Start-up Timer Status bit
When the FOSC<2:0> bits select HS, XT or LP oscillator:
1= OST has counted 1024 clocks, device is clocked by the FOSC<2:0> bit selection
0= OST is counting, device is clocked from the internal oscillator (INTOSC) selected by the IRCF<3:0>
bits.
For all other FOSC<2:0> bit selections:
See Table 5-2, “OSTS Bit Definition”.
bit 4
HFIOFR: High-Frequency Internal Oscillator Ready bit
1= HFINTOSC is ready
0= HFINTOSC is not ready
bit 3-2
bit 1
Unimplemented: Read as ‘0’
LFIOFR: Low-Frequency Internal Oscillator Ready bit
1= LFINTOSC is ready
0= LFINTOSC is not ready
bit 0
HFIOFS: High-Frequency Internal Oscillator Stable bit
1= HFINTOSC 16 MHz Oscillator is stable and is driving the INTOSC
0= HFINTOSC 16 MHz is not stable, the Start-up Oscillator is driving INTOSC
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TABLE 5-4:
Name
SUMMARY OF REGISTERS ASSOCIATED WITH CLOCK SOURCES
Register
on Page
Bit 7
Bit 6
Bit 5
Bit 4
Bit 3
Bit 2
Bit 1
Bit 0
OSCCON
OSCSTAT
PIE2
—
IRCF<3:0>
—
SCS<1:0>
LFIOFR HFIOFS
60
61
SOSCR
OSFIE
OSFIF
—
OSTS
C1IE
C1IF
HFIOFR
—
—
C2IE
C2IF
—
—
BCL1IE
BCL1IF
NCO1IE
NCO1IF
—
—
—
—
—
78
PIR2
81
T1CON
TMR1CS<1:0>
T1CKPS<1:0>
T1OSCEN T1SYNC
TMR1ON
171
Legend: — = unimplemented location, read as ‘0’. Shaded cells are not used by clock sources.
TABLE 5-5: SUMMARY OF CONFIGURATION WORD WITH CLOCK SOURCES
Register
on Page
Name
Bits
Bit -/7
Bit -/6
Bit 13/5
Bit 12/4
Bit 11/3
Bit 10/2
Bit 9/1
Bit 8/0
13:8
7:0
—
—
FCMEN
PWRTE
IESO
CLKOUTEN
BOREN<1:0>
FOSC<2:0>
—
CONFIG1
42
CP
MCLRE
WDTE<1:0>
Legend:
— = unimplemented location, read as ‘0’. Shaded cells are not used by clock sources.
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6.0
RESETS
There are multiple ways to reset this device:
• Power-On Reset (POR)
• Brown-Out Reset (BOR)
• Low-Power Brown-Out Reset (LPBOR)
• MCLR Reset
• WDT Reset
• RESETinstruction
• Stack Overflow
• Stack Underflow
• Programming mode exit
To allow VDD to stabilize, an optional power-up timer
can be enabled to extend the Reset time after a BOR
or POR event.
A simplified block diagram of the On-chip Reset Circuit
is shown in Figure 6-1.
FIGURE 6-1:
SIMPLIFIED BLOCK DIAGRAM OF ON-CHIP RESET CIRCUIT
Rev. 10-000006A_A1
ICSP™ Programming Mode Exit
RESETInstruction
Stack Underflow
Stack Overlfow
MCLRE
Sleep
VPP/MCLR
WDT
Time-out
Device
Reset
Power-on
Reset
VDD
BOR
Active(1)
Brown-out
Reset
R
Power-up
Timer
LFINTOSC
PWRTE
LPBOR
Reset
Note 1: See Table 6-1 for BOR active conditions.
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6.1
Power-On Reset (POR)
6.2
Brown-Out Reset (BOR)
The POR circuit holds the device in Reset until VDD has
reached an acceptable level for minimum operation.
Slow rising VDD, fast operating speeds or analog
performance may require greater than minimum VDD.
The PWRT, BOR or MCLR features can be used to
extend the start-up period until all device operation
conditions have been met.
The BOR circuit holds the device in Reset when VDD
reaches a selectable minimum level. Between the
POR and BOR, complete voltage range coverage for
execution protection can be implemented.
The Brown-out Reset module has four operating
modes controlled by the BOREN<1:0> bits in Configu-
ration Words. The four operating modes are:
• BOR is always on
6.1.1
POWER-UP TIMER (PWRT)
• BOR is off when in Sleep
• BOR is controlled by software
• BOR is always off
The Power-up Timer provides a nominal 64 ms
time-out on POR or Brown-out Reset.
The device is held in Reset as long as PWRT is active.
The PWRT delay allows additional time for the VDD to
rise to an acceptable level. The Power-up Timer is
enabled by clearing the PWRTE bit in Configuration
Words.
Refer to Table 6-1 for more information.
The Brown-out Reset voltage level is selectable by
configuring the BORV bit in Configuration Words.
A VDD noise rejection filter prevents the BOR from trig-
gering on small events. If VDD falls below VBOR for a
duration greater than parameter TBORDC, the device
will reset. See Figure 6-2 for more information.
The Power-up Timer starts after the release of the POR
and BOR.
For additional information, refer to Application Note
AN607, “Power-up Trouble Shooting” (DS00607).
TABLE 6-1:
BOREN<1:0>
11
BOR OPERATING MODES
Instruction Execution upon:
Release of POR or Wake-up from Sleep
SBOREN
Device Mode
BOR Mode
X
X
Active
Waits for BOR ready(1)
(BORRDY = 1)
Awake
Sleep
Active
Disabled
Active
Waits for BOR ready
10
X
1
(BORRDY = 1)
Waits for BOR ready(1)
X
(BORRDY = 1)
01
00
0
X
X
X
Disabled
Disabled
Begins immediately
(BORRDY = x)
Note 1: In these specific cases, “release of POR” and “wake-up from Sleep,” there is no delay in start-up. The BOR
ready flag, (BORRDY = 1), will be set before the CPU is ready to execute instructions because the BOR
circuit is forced on by the BOREN<1:0> bits.
BOR protection is not active during Sleep. The device
wake-up will be delayed until the BOR is ready.
6.2.1
BOR IS ALWAYS ON
When the BOREN bits of Configuration Words are pro-
grammed to ‘11’, the BOR is always on. The device
start-up will be delayed until the BOR is ready and VDD
is higher than the BOR threshold.
6.2.3
BOR CONTROLLED BY SOFTWARE
When the BOREN bits of Configuration Words are
programmed to ‘01’, the BOR is controlled by the
SBOREN bit of the BORCON register. The device
start-up is not delayed by the BOR ready condition or
the VDD level.
BOR protection is active during Sleep. The BOR does
not delay wake-up from Sleep.
6.2.2
BOR IS OFF IN SLEEP
BOR protection begins as soon as the BOR circuit is
ready. The status of the BOR circuit is reflected in the
BORRDY bit of the BORCON register.
When the BOREN bits of Configuration Words are pro-
grammed to ‘10’, the BOR is on, except in Sleep. The
device start-up will be delayed until the BOR is ready
and VDD is higher than the BOR threshold.
BOR protection is unchanged by Sleep.
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PIC16(L)F1508/9
FIGURE 6-2:
BROWN-OUT SITUATIONS
VDD
VBOR
Internal
Reset
(1)
TPWRT
VDD
VBOR
Internal
Reset
< TPWRT
(1)
TPWRT
VDD
VBOR
Internal
Reset
(1)
TPWRT
Note 1: TPWRT delay only if PWRTE bit is programmed to ‘0’.
6.3
Register Definitions: BOR Control
REGISTER 6-1:
BORCON: BROWN-OUT RESET CONTROL REGISTER
R/W-1/u
SBOREN
bit 7
R/W-0/u
BORFS
U-0
—
U-0
—
U-0
—
U-0
—
U-0
—
R-q/u
BORRDY
bit 0
Legend:
R = Readable bit
W = Writable bit
x = Bit is unknown
‘0’ = Bit is cleared
U = Unimplemented bit, read as ‘0’
u = Bit is unchanged
‘1’ = Bit is set
-n/n = Value at POR and BOR/Value at all other Resets
q = Value depends on condition
bit 7
bit 6
SBOREN: Software Brown-Out Reset Enable bit
If BOREN <1:0> in Configuration Words = 01:
1= BOR Enabled
0= BOR Disabled
If BOREN <1:0> in Configuration Words 01:
SBOREN is read/write, but has no effect on the BOR
(1)
BORFS: Brown-Out Reset Fast Start bit
If BOREN <1:0> = 10 (Disabled in Sleep) or BOREN<1:0> = 01 (Under software control):
1= Band gap is forced on always (covers sleep/wake-up/operating cases)
0= Band gap operates normally, and may turn off
If BOREN<1:0> = 11 (Always on) or BOREN<1:0> = 00 (Always off)
BORFS is Read/Write, but has no effect.
bit 5-1
bit 0
Unimplemented: Read as ‘0’
BORRDY: Brown-Out Reset Circuit Ready Status bit
1= The Brown-out Reset circuit is active
0= The Brown-out Reset circuit is inactive
Note 1: BOREN<1:0> bits are located in Configuration Words.
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6.4
Low-Power Brown-Out Reset
(LPBOR)
6.6
Watchdog Timer (WDT) Reset
The Watchdog Timer generates a Reset if the firmware
does not issue a CLRWDTinstruction within the time-out
period. The TO and PD bits in the STATUS register are
changed to indicate the WDT Reset. See Section 9.0
“Watchdog Timer (WDT)” for more information.
The Low-Power Brown-Out Reset (LPBOR) operates
like the BOR to detect low voltage conditions on the
VDD pin. When too low of a voltage is detected, the
device is held in Reset. When this occurs, a register bit
(BOR) is changed to indicate that a BOR Reset has
occurred. The BOR bit in PCON is used for both BOR
and the LPBOR. Refer to Register 6-2.
6.7
RESETInstruction
A RESETinstruction will cause a device Reset. The RI
bit in the PCON register will be set to ‘0’. See Table 6-4
for default conditions after a RESET instruction has
occurred.
The LPBOR voltage threshold (VLPBOR) has a wider
tolerance than the BOR (VBOR), but requires much
less current (LPBOR current) to operate. The LPBOR
is intended for use when the BOR is configured as dis-
abled (BOREN = 00) or disabled in Sleep mode
(BOREN = 10).
6.8
Stack Overflow/Underflow Reset
The device can reset when the Stack Overflows or
Underflows. The STKOVF or STKUNF bits of the PCON
register indicate the Reset condition. These Resets are
enabled by setting the STVREN bit in Configuration
Words. See Section 3.4.2 “Overflow/Underflow
Reset” for more information.
Refer to Figure 6-1 to see how the LPBOR interacts
with other modules.
6.4.1
ENABLING LPBOR
The LPBOR is controlled by the LPBOR bit of
Configuration Words. When the device is erased, the
LPBOR module defaults to disabled.
6.9
Programming Mode Exit
6.5
MCLR
Upon exit of Programming mode, the device will
behave as if a POR had just occurred.
The MCLR is an optional external input that can reset
the device. The MCLR function is controlled by the
MCLRE bit of Configuration Words and the LVP bit of
Configuration Words (Table 6-2).
6.10 Power-Up Timer
The Power-up Timer optionally delays device execution
after a BOR or POR event. This timer is typically used to
allow VDD to stabilize before allowing the device to start
running.
TABLE 6-2:
MCLRE
MCLR CONFIGURATION
LVP
MCLR
The Power-up Timer is controlled by the PWRTE bit of
Configuration Words.
0
1
x
0
0
1
Disabled
Enabled
Enabled
6.11 Start-up Sequence
Upon the release of a POR or BOR, the following must
occur before the device will begin executing:
6.5.1
MCLR ENABLED
When MCLR is enabled and the pin is held low, the
device is held in Reset. The MCLR pin is connected to
VDD through an internal weak pull-up.
1. Power-up Timer runs to completion (if enabled).
2. MCLR must be released (if enabled).
The total time-out will vary based on oscillator configu-
ration and Power-up Timer configuration. See
Section 5.0 “Oscillator Module (With Fail-Safe
Clock Monitor)” for more information.
The device has a noise filter in the MCLR Reset path.
The filter will detect and ignore small pulses.
Note:
A Reset does not drive the MCLR pin low.
The Power-up Timer runs independently of MCLR
Reset. If MCLR is kept low long enough, the Power-up
Timer will expire. Upon bringing MCLR high, the device
will begin execution after 10 FOSC cycles (see
Figure 6-3). This is useful for testing purposes or to
synchronize more than one device operating in parallel.
6.5.2
MCLR DISABLED
When MCLR is disabled, the pin functions as a general
purpose input and the internal weak pull-up is under
software control. See Section 11.3 “PORTA Regis-
ters” for more information.
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PIC16(L)F1508/9
FIGURE 6-3:
RESET START-UP SEQUENCE
Rev. 10-000032A_A0
VDD
Internal POR
Power-up Timer
MCLR
TPWRT
Internal RESET
Int. Oscillator
FOSC
Begin Execution
code execution (1)
code execution (1)
Internal Oscillator, PWRTEN = 0
Internal Oscillator, PWRTEN = 1
VDD
Internal POR
Power-up Timer
MCLR
TPWRT
Internal RESET
Ext. Clock (EC)
FOSC
Begin Execution
code execution (1)
code execution (1)
External Clock (EC modes), PWRTEN = 0
External Clock (EC modes), PWRTEN = 1
VDD
Internal POR
Power-up Timer
MCLR
TPWRT
Internal RESET
Osc Start-Up Timer
Ext. Oscillator
FOSC
TOST
TOST
Begin Execution
code
code
execution (1)
execution (1)
External Oscillators , PWRTEN = 0, IESO = 0
External Oscillators , PWRTEN = 1, IESO = 0
VDD
Internal POR
Power-up Timer
MCLR
TPWRT
Internal RESET
Osc Start-Up Timer
Ext. Oscillator
TOST
TOST
Int. Oscillator
FOSC
code execution (1)
code execution (1)
Begin Execution
External Oscillators , PWRTEN = 0, IESO = 1
External Oscillators , PWRTEN = 1, IESO = 1
Note 1: Code execution begins 10 FOSC cycles after the FOSC clock is released.
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6.12 Determining the Cause of a Reset
Upon any Reset, multiple bits in the STATUS and
PCON registers are updated to indicate the cause of
the Reset. Table 6-3 and Table 6-4 show the Reset
conditions of these registers.
TABLE 6-3:
RESET STATUS BITS AND THEIR SIGNIFICANCE
STKOVF STKUNF RWDT RMCLR
RI
POR BOR
TO
PD
Condition
Power-on Reset
0
0
0
0
u
u
u
u
u
u
1
u
0
0
0
0
u
u
u
u
u
u
u
1
1
1
1
u
0
u
u
u
u
u
u
u
1
1
1
1
u
u
u
0
0
u
u
u
1
1
1
1
u
u
u
u
u
0
u
u
0
0
0
u
u
u
u
u
u
u
u
u
x
x
x
0
u
u
u
u
u
u
u
u
1
0
x
1
0
0
1
u
1
u
u
u
1
x
0
1
u
0
0
u
0
Illegal, TO is set on POR
Illegal, PD is set on POR
Brown-out Reset
WDT Reset
WDT Wake-up from Sleep
Interrupt Wake-up from Sleep
MCLR Reset during normal operation
MCLR Reset during Sleep
u RESETInstruction Executed
u
u
Stack Overflow Reset (STVREN = 1)
Stack Underflow Reset (STVREN = 1)
TABLE 6-4:
RESET CONDITION FOR SPECIAL REGISTERS
Program
STATUS
Register
PCON
Register
Condition
Counter
Power-on Reset
0000h
---1 1000
---u uuuu
00-- 110x
uu-- 0uuu
MCLR Reset during normal operation
0000h
MCLR Reset during Sleep
WDT Reset
0000h
0000h
---1 0uuu
---0 uuuu
---0 0uuu
---1 1uuu
---1 0uuu
---u uuuu
---u uuuu
---u uuuu
uu-- 0uuu
uu-- uuuu
uu-- uuuu
00-- 11u0
uu-- uuuu
uu-- u0uu
1u-- uuuu
u1-- uuuu
WDT Wake-up from Sleep
Brown-out Reset
PC + 1
0000h
Interrupt Wake-up from Sleep
RESETInstruction Executed
Stack Overflow Reset (STVREN = 1)
Stack Underflow Reset (STVREN = 1)
PC + 1(1)
0000h
0000h
0000h
Legend: u= unchanged, x= unknown, -= unimplemented bit, reads as ‘0’.
Note 1: When the wake-up is due to an interrupt and the Global Interrupt Enable bit (GIE) is set, the return address
is pushed on the stack and PC is loaded with the interrupt vector (0004h) after execution of PC + 1.
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6.13 Power Control (PCON) Register
The Power Control (PCON) register contains flag bits
to differentiate between a:
• Power-On Reset (POR)
• Brown-Out Reset (BOR)
• Reset Instruction Reset (RI)
• MCLR Reset (RMCLR)
• Watchdog Timer Reset (RWDT)
• Stack Underflow Reset (STKUNF)
• Stack Overflow Reset (STKOVF)
The PCON register bits are shown in Register 6-2.
6.14 Register Definitions: Power Control
REGISTER 6-2:
PCON: POWER CONTROL REGISTER
R/W/HS-0/q R/W/HS-0/q
U-0
—
R/W/HC-1/q R/W/HC-1/q R/W/HC-1/q R/W/HC-q/u R/W/HC-q/u
STKOVF
bit 7
STKUNF
RWDT
RMCLR
RI
POR
BOR
bit 0
Legend:
HC = Bit is cleared by hardware
HS = Bit is set by hardware
U = Unimplemented bit, read as ‘0’
R = Readable bit
u = Bit is unchanged
‘1’ = Bit is set
W = Writable bit
x = Bit is unknown
‘0’ = Bit is cleared
-n/n = Value at POR and BOR/Value at all other Resets
q = Value depends on condition
bit 7
bit 6
STKOVF: Stack Overflow Flag bit
1= A Stack Overflow occurred
0= A Stack Overflow has not occurred or cleared by firmware
STKUNF: Stack Underflow Flag bit
1= A Stack Underflow occurred
0= A Stack Underflow has not occurred or cleared by firmware
bit 5
bit 4
Unimplemented: Read as ‘0’
RWDT: Watchdog Timer Reset Flag bit
1= A Watchdog Timer Reset has not occurred or set by firmware
0= A Watchdog Timer Reset has occurred (cleared by hardware)
bit 3
bit 2
bit 1
bit 0
RMCLR: MCLR Reset Flag bit
1= A MCLR Reset has not occurred or set by firmware
0= A MCLR Reset has occurred (cleared by hardware)
RI: RESETInstruction Flag bit
1= A RESETinstruction has not been executed or set by firmware
0= A RESETinstruction has been executed (cleared by hardware)
POR: Power-On Reset Status bit
1= No Power-on Reset occurred
0= A Power-on Reset occurred (must be set in software after a Power-on Reset occurs)
BOR: Brown-Out Reset Status bit
1= No Brown-out Reset occurred
0= A Brown-out Reset occurred (must be set in software after a Power-on Reset or Brown-out Reset
occurs)
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TABLE 6-5:
Name
SUMMARY OF REGISTERS ASSOCIATED WITH RESETS
Register
on Page
Bit 7
Bit 6
Bit 5
Bit 4
Bit 3
Bit 2
Bit 1
Bit 0
BORCON SBOREN BORFS
—
—
—
—
RWDT
TO
—
RMCLR
PD
—
RI
Z
—
POR
DC
BORRDY
BOR
65
69
19
91
PCON
STKOVF STKUNF
STATUS
WDTCON
—
—
—
—
C
WDTPS<4:0>
SWDTEN
Legend: — = unimplemented bit, reads as ‘0’. Shaded cells are not used by Resets.
Note 1: Other (non Power-up) Resets include MCLR Reset and Watchdog Timer Reset during normal operation.
TABLE 6-6:
SUMMARY OF CONFIGURATION WORD WITH RESETS
Register
on Page
Name
Bits Bit -/7
Bit -/6 Bit 13/5 Bit 12/4
Bit 11/3
Bit 10/2
Bit 9/1
Bit 8/0
13:8
7:0
—
CP
—
—
FCMEN
IESO
CLKOUTEN
BOREN<1:0>
FOSC<2:0>
BORV STVREN
—
CONFIG1
CONFIG2
42
44
MCLRE PWRTE
WDTE<1:0>
13:8
7:0
—
—
LVP
—
DEBUG
—
LPBOR
—
—
—
—
WRT<1:0>
Legend: — = unimplemented location, read as ‘0’. Shaded cells are not used by Resets.
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PIC16(L)F1508/9
7.0
INTERRUPTS
The interrupt feature allows certain events to preempt
normal program flow. Firmware is used to determine
the source of the interrupt and act accordingly. Some
interrupts can be configured to wake the MCU from
Sleep mode.
This chapter contains the following information for
Interrupts:
• Operation
• Interrupt Latency
• Interrupts During Sleep
• INT Pin
• Automatic Context Saving
Many peripherals produce interrupts. Refer to the
corresponding chapters for details.
A block diagram of the interrupt logic is shown in
Figure 7-1.
FIGURE 7-1:
INTERRUPT LOGIC
Rev. 10-000010A_A0
TMR0IF
TMR0IE
Wake-up
(If in Sleep mode)
INTF
INTE
Peripheral Interrupts
(TMR1IF) PIR1<0>
IOCIF
IOCIE
Interrupt
to CPU
(TMR1IE) PIE1<0>
PEIE
GIE
PIRn<7>
PIEn<7>
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7.1
Operation
7.2
Interrupt Latency
Interrupts are disabled upon any device Reset. They
are enabled by setting the following bits:
Interrupt latency is defined as the time from when the
interrupt event occurs to the time code execution at the
interrupt vector begins. The latency for synchronous
interrupts is three or four instruction cycles. For
asynchronous interrupts, the latency is three to five
instruction cycles, depending on when the interrupt
occurs. See Figure 7-2 and Figure 7-3 for more details.
• GIE bit of the INTCON register
• Interrupt Enable bit(s) for the specific interrupt
event(s)
• PEIE bit of the INTCON register (if the Interrupt
Enable bit of the interrupt event is contained in the
PIE1, PIE2 and PIE3 registers)
The INTCON, PIR1, PIR2 and PIR3 registers record
individual interrupts via interrupt flag bits. Interrupt flag
bits will be set, regardless of the status of the GIE, PEIE
and individual interrupt enable bits.
The following events happen when an interrupt event
occurs while the GIE bit is set:
• Current prefetched instruction is flushed
• GIE bit is cleared
• Current Program Counter (PC) is pushed onto the
stack
• Critical registers are automatically saved to the
shadow registers (See “Section 7.5 “Automatic
Context Saving”.”)
• PC is loaded with the interrupt vector 0004h
The firmware within the Interrupt Service Routine (ISR)
should determine the source of the interrupt by polling
the interrupt flag bits. The interrupt flag bits must be
cleared before exiting the ISR to avoid repeated
interrupts. Because the GIE bit is cleared, any interrupt
that occurs while executing the ISR will be recorded
through its interrupt flag, but will not cause the
processor to redirect to the interrupt vector.
The RETFIE instruction exits the ISR by popping the
previous address from the stack, restoring the saved
context from the shadow registers and setting the GIE
bit.
For additional information on a specific interrupt’s
operation, refer to its peripheral chapter.
Note 1: Individual interrupt flag bits are set,
regardless of the state of any other
enable bits.
2: All interrupts will be ignored while the GIE
bit is cleared. Any interrupt occurring
while the GIE bit is clear will be serviced
when the GIE bit is set again.
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FIGURE 7-2:
INTERRUPT LATENCY
Fosc
Q1 Q2 Q3 Q4 Q1 Q2 Q3 Q4 Q1 Q2 Q3 Q4 Q1 Q2 Q3 Q4 Q1 Q2 Q3 Q4 Q1 Q2 Q3 Q4 Q1 Q2 Q3 Q4 Q1 Q2 Q3 Q4
CLKR
Interrupt Sampled
during Q1
Interrupt
GIE
PC-1
PC
PC+1
0004h
0005h
PC
1-Cycle Instruction at PC
Execute
Inst(PC)
NOP
NOP
Inst(0004h)
Interrupt
GIE
PC+1/FSR
ADDR
New PC/
PC+1
PC-1
PC
0004h
0005h
PC
Execute
2-Cycle Instruction at PC
Inst(PC)
NOP
NOP
Inst(0004h)
Interrupt
GIE
PC-1
PC
FSR ADDR
INST(PC)
PC+1
PC+2
0004h
0005h
PC
Execute
3-Cycle Instruction at PC
NOP
NOP
NOP
Inst(0004h)
Inst(0005h)
Interrupt
GIE
PC-1
PC
FSR ADDR
INST(PC)
PC+1
PC+2
0004h
0005h
PC
NOP
Execute
3-Cycle Instruction at PC
NOP
NOP
NOP
Inst(0004h)
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FIGURE 7-3:
INT PIN INTERRUPT TIMING
Q1 Q2 Q3 Q4 Q1 Q2 Q3 Q4 Q1 Q2 Q3 Q4 Q1 Q2 Q3 Q4 Q1 Q2 Q3 Q4
FOSC
CLKOUT
(3)
INT pin
INTF
(1)
(1)
(2)
(4)
Interrupt Latency
GIE
INSTRUCTION FLOW
PC
PC + 1
—
0004h
0005h
PC
Inst (PC)
PC + 1
Instruction
Fetched
Inst (PC + 1)
Inst (0004h)
Inst (0005h)
Inst (0004h)
Instruction
Executed
Forced NOP
Forced NOP
Inst (PC)
Inst (PC – 1)
Note 1: INTF flag is sampled here (every Q1).
2: Asynchronous interrupt latency = 3-5 TCY. Synchronous latency = 3-4 TCY, where TCY = instruction cycle time.
Latency is the same whether Inst (PC) is a single cycle or a 2-cycle instruction.
3: For minimum width of INT pulse, refer to AC specifications in Section 29.0 “Electrical Specifications”.
4: INTF is enabled to be set any time during the Q4-Q1 cycles.
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7.3
Interrupts During Sleep
Some interrupts can be used to wake from Sleep. To
wake from Sleep, the peripheral must be able to
operate without the system clock. The interrupt source
must have the appropriate Interrupt Enable bit(s) set
prior to entering Sleep.
On waking from Sleep, if the GIE bit is also set, the
processor will branch to the interrupt vector. Otherwise,
the processor will continue executing instructions after
the SLEEPinstruction. The instruction directly after the
SLEEP instruction will always be executed before
branching to the ISR. Refer to Section 8.0 “Power-
Down Mode (Sleep)” for more details.
7.4
INT Pin
The INT pin can be used to generate an asynchronous
edge-triggered interrupt. This interrupt is enabled by
setting the INTE bit of the INTCON register. The
INTEDG bit of the OPTION_REG register determines on
which edge the interrupt will occur. When the INTEDG
bit is set, the rising edge will cause the interrupt. When
the INTEDG bit is clear, the falling edge will cause the
interrupt. The INTF bit of the INTCON register will be set
when a valid edge appears on the INT pin. If the GIE and
INTE bits are also set, the processor will redirect
program execution to the interrupt vector.
7.5
Automatic Context Saving
Upon entering an interrupt, the return PC address is
saved on the stack. Additionally, the following registers
are automatically saved in the shadow registers:
• W register
• STATUS register (except for TO and PD)
• BSR register
• FSR registers
• PCLATH register
Upon exiting the Interrupt Service Routine, these regis-
ters are automatically restored. Any modifications to
these registers during the ISR will be lost. If modifica-
tions to any of these registers are desired, the corre-
sponding shadow register should be modified and the
value will be restored when exiting the ISR. The
shadow registers are available in Bank 31 and are
readable and writable. Depending on the user’s appli-
cation, other registers may also need to be saved.
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7.6
Register Definitions: Interrupt Control
REGISTER 7-1:
INTCON: INTERRUPT CONTROL REGISTER
R/W-0/0
GIE
R/W-0/0
PEIE
R/W-0/0
TMR0IE
R/W-0/0
INTE
R/W-0/0
IOCIE
R/W-0/0
TMR0IF
R/W-0/0
INTF
R-0/0
IOCIF(1)
bit 7
bit 0
Legend:
R = Readable bit
W = Writable bit
U = Unimplemented bit, read as ‘0’
-n/n = Value at POR and BOR/Value at all other Resets
u = Bit is unchanged
‘1’ = Bit is set
x = Bit is unknown
‘0’ = Bit is cleared
bit 7
GIE: Global Interrupt Enable bit
1= Enables all active interrupts
0= Disables all interrupts
bit 6
bit 5
bit 4
bit 3
bit 2
bit 1
bit 0
PEIE: Peripheral Interrupt Enable bit
1= Enables all active peripheral interrupts
0= Disables all peripheral interrupts
TMR0IE: Timer0 Overflow Interrupt Enable bit
1= Enables the Timer0 interrupt
0= Disables the Timer0 interrupt
INTE: INT External Interrupt Enable bit
1= Enables the INT external interrupt
0= Disables the INT external interrupt
IOCIE: Interrupt-on-Change Enable bit
1= Enables the interrupt-on-change
0= Disables the interrupt-on-change
TMR0IF: Timer0 Overflow Interrupt Flag bit
1= TMR0 register has overflowed
0= TMR0 register did not overflow
INTF: INT External Interrupt Flag bit
1= The INT external interrupt occurred
0= The INT external interrupt did not occur
IOCIF: Interrupt-on-Change Interrupt Flag bit(1)
1= When at least one of the interrupt-on-change pins changed state
0= None of the interrupt-on-change pins have changed state
Note 1: The IOCIF Flag bit is read-only and cleared when all the interrupt-on-change flags in the IOCxF register
have been cleared by software.
Note:
Interrupt flag bits are set when an interrupt
condition occurs, regardless of the state of
its corresponding enable bit or the Global
Interrupt Enable bit, GIE, of the INTCON
register. User software should ensure the
appropriate interrupt flag bits are clear
prior to enabling an interrupt.
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REGISTER 7-2:
PIE1: PERIPHERAL INTERRUPT ENABLE REGISTER 1
R/W-0/0
TMR1GIE
bit 7
R/W-0/0
ADIE
R/W-0/0
RCIE
R/W-0/0
TXIE
R/W-0/0
SSP1IE
U-0
—
R/W-0/0
TMR2IE
R/W-0/0
TMR1IE
bit 0
Legend:
R = Readable bit
W = Writable bit
U = Unimplemented bit, read as ‘0’
-n/n = Value at POR and BOR/Value at all other Resets
u = Bit is unchanged
‘1’ = Bit is set
x = Bit is unknown
‘0’ = Bit is cleared
bit 7
bit 6
bit 5
bit 4
bit 3
TMR1GIE: Timer1 Gate Interrupt Enable bit
1= Enables the Timer1 gate acquisition interrupt
0= Disables the Timer1 gate acquisition interrupt
ADIE: Analog-to-Digital Converter (ADC) Interrupt Enable bit
1= Enables the ADC interrupt
0= Disables the ADC interrupt
RCIE: USART Receive Interrupt Enable bit
1= Enables the USART receive interrupt
0= Disables the USART receive interrupt
TXIE: USART Transmit Interrupt Enable bit
1= Enables the USART transmit interrupt
0= Disables the USART transmit interrupt
SSP1IE: Synchronous Serial Port (MSSP) Interrupt Enable bit
1= Enables the MSSP interrupt
0= Disables the MSSP interrupt
bit 2
bit 1
Unimplemented: Read as ‘0’
TMR2IE: TMR2 to PR2 Match Interrupt Enable bit
1= Enables the Timer2 to PR2 match interrupt
0= Disables the Timer2 to PR2 match interrupt
bit 0
TMR1IE: Timer1 Overflow Interrupt Enable bit
1= Enables the Timer1 overflow interrupt
0= Disables the Timer1 overflow interrupt
Note:
Bit PEIE of the INTCON register must be
set to enable any peripheral interrupt.
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REGISTER 7-3:
PIE2: PERIPHERAL INTERRUPT ENABLE REGISTER 2
R/W-0/0
OSFIE
bit 7
R/W-0/0
C2IE
R/W-0/0
C1IE
U-0
—
R/W-0/0
BCL1IE
R/W-0/0
NCO1IE
U-0
—
U-0
—
bit 0
Legend:
R = Readable bit
W = Writable bit
x = Bit is unknown
‘0’ = Bit is cleared
U = Unimplemented bit, read as ‘0’
-n/n = Value at POR and BOR/Value at all other Resets
u = Bit is unchanged
‘1’ = Bit is set
bit 7
bit 6
bit 5
OSFIE: Oscillator Fail Interrupt Enable bit
1= Enables the Oscillator Fail interrupt
0= Disables the Oscillator Fail interrupt
C2IE: Comparator C2 Interrupt Enable bit
1= Enables the Comparator C2 interrupt
0= Disables the Comparator C2 interrupt
C1IE: Comparator C1 Interrupt Enable bit
1= Enables the Comparator C1 interrupt
0= Disables the Comparator C1 interrupt
bit 4
bit 3
Unimplemented: Read as ‘0’
BCL1IE: MSSP Bus Collision Interrupt Enable bit
1= Enables the MSSP Bus Collision Interrupt
0= Disables the MSSP Bus Collision Interrupt
bit 2
NCO1IE: Numerically Controlled Oscillator Interrupt Enable bit
1= Enables the NCO interrupt
0= Disables the NCO interrupt
bit 1-0
Unimplemented: Read as ‘0’
Note:
Bit PEIE of the INTCON register must be
set to enable any peripheral interrupt.
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REGISTER 7-4:
PIE3: PERIPHERAL INTERRUPT ENABLE REGISTER 3
U-0
—
U-0
—
U-0
—
U-0
—
R/W-0/0
CLC4IE
R/W-0/0
CLC3IE
R/W-0/0
CLC2IE
R/W-0/0
CLC1IE
bit 7
bit 0
Legend:
R = Readable bit
u = Bit is unchanged
‘1’ = Bit is set
W = Writable bit
x = Bit is unknown
‘0’ = Bit is cleared
U = Unimplemented bit, read as ‘0’
-n/n = Value at POR and BOR/Value at all other Resets
bit 7-4
bit 3
Unimplemented: Read as ‘0’
CLC4IE: Configurable Logic Block 4 Interrupt Enable bit
1= Enables the CLC 4 interrupt
0= Disables the CLC 4 interrupt
bit 2
bit 1
bit 0
CLC3IE: Configurable Logic Block 3 Interrupt Enable bit
1= Enables the CLC 3 interrupt
0= Disables the CLC 3 interrupt
CLC2IE: Configurable Logic Block 2 Interrupt Enable bit
1= Enables the CLC 2 interrupt
0= Disables the CLC 2 interrupt
CLC1IE: Configurable Logic Block 1 Interrupt Enable bit
1= Enables the CLC 1 interrupt
0= Disables the CLC 1 interrupt
Note:
Bit PEIE of the INTCON register must be
set to enable any peripheral interrupt.
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REGISTER 7-5:
PIR1: PERIPHERAL INTERRUPT REQUEST REGISTER 1
R/W-0/0
TMR1GIF
bit 7
R/W-0/0
ADIF
R/W-0/0
RCIF
R/W-0/0
TXIF
R/W-0/0
SSP1IF
U-0
—
R/W-0/0
TMR2IF
R/W-0/0
TMR1IF
bit 0
Legend:
R = Readable bit
W = Writable bit
U = Unimplemented bit, read as ‘0’
-n/n = Value at POR and BOR/Value at all other Resets
u = Bit is unchanged
‘1’ = Bit is set
x = Bit is unknown
‘0’ = Bit is cleared
bit 7
bit 6
bit 5
bit 4
bit 3
TMR1GIF: Timer1 Gate Interrupt Flag bit
1= Interrupt is pending
0= Interrupt is not pending
ADIF: ADC Interrupt Flag bit
1= Interrupt is pending
0= Interrupt is not pending
RCIF: USART Receive Interrupt Flag bit
1= Interrupt is pending
0= Interrupt is not pending
TXIF: USART Transmit Interrupt Flag bit
1= Interrupt is pending
0= Interrupt is not pending
SSP1IF: Synchronous Serial Port (MSSP) Interrupt Flag bit
1= Interrupt is pending
0= Interrupt is not pending
bit 2
bit 1
Unimplemented: Read as ‘0’
TMR2IF: Timer2 to PR2 Interrupt Flag bit
1= Interrupt is pending
0= Interrupt is not pending
bit 0
TMR1IF: Timer1 Overflow Interrupt Flag bit
1= Interrupt is pending
0= Interrupt is not pending
Note:
Interrupt flag bits are set when an interrupt
condition occurs, regardless of the state of
its corresponding enable bit or the Global
Interrupt Enable bit, GIE, of the INTCON
register. User software should ensure the
appropriate interrupt flag bits are clear prior
to enabling an interrupt.
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PIC16(L)F1508/9
REGISTER 7-6:
PIR2: PERIPHERAL INTERRUPT REQUEST REGISTER 2
R/W-0/0
OSFIF
R/W-0/0
C2IF
R/W-0/0
C1IF
U-0
—
R/W-0/0
BCL1IF
R/W-0/0
NCO1IF
U-0
—
U-0
—
bit 7
bit 0
Legend:
R = Readable bit
W = Writable bit
x = Bit is unknown
‘0’ = Bit is cleared
U = Unimplemented bit, read as ‘0’
-n/n = Value at POR and BOR/Value at all other Resets
u = Bit is unchanged
‘1’ = Bit is set
bit 7
bit 6
bit 5
OSFIF: Oscillator Fail Interrupt Flag bit
1= Interrupt is pending
0= Interrupt is not pending
C2IF: Numerically Controlled Oscillator Flag bit
1= Interrupt is pending
0= Interrupt is not pending
C1IF: Numerically Controlled Oscillator Flag bit
1= Interrupt is pending
0= Interrupt is not pending
bit 4
bit 3
Unimplemented: Read as ‘0’
BCL1IF: MSSP Bus Collision Interrupt Flag bit
1= Interrupt is pending
0= Interrupt is not pending
bit 2
NCO1IF: Numerically Controlled Oscillator Flag bit
1= Interrupt is pending
0= Interrupt is not pending
bit 1-0
Unimplemented: Read as ‘0’
Note:
Interrupt flag bits are set when an interrupt
condition occurs, regardless of the state of
its corresponding enable bit or the Global
Interrupt Enable bit, GIE, of the INTCON
register. User software should ensure the
appropriate interrupt flag bits are clear prior
to enabling an interrupt.
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REGISTER 7-7:
PIR3: PERIPHERAL INTERRUPT REQUEST REGISTER 3
U-0
—
U-0
—
U-0
—
U-0
—
R/W-0/0
CLC4IF
R/W-0/0
CLC3IF
R/W-0/0
CLC2IF
R/W-0/0
CLC1IF
bit 7
bit 0
Legend:
R = Readable bit
u = Bit is unchanged
‘1’ = Bit is set
W = Writable bit
x = Bit is unknown
‘0’ = Bit is cleared
U = Unimplemented bit, read as ‘0’
-n/n = Value at POR and BOR/Value at all other Resets
bit 7-4
bit 3
Unimplemented: Read as ‘0’
CLC4IF: Configurable Logic Block 4 Interrupt Flag bit
1= Interrupt is pending
0= Interrupt is not pending
bit 2
bit 1
bit 0
CLC3IF: Configurable Logic Block 3 Interrupt Flag bit
1= Interrupt is pending
0= Interrupt is not pending
CLC2IF: Configurable Logic Block 2 Interrupt Flag bit
1= Interrupt is pending
0= Interrupt is not pending
CLC1IF: Configurable Logic Block 1 Interrupt Flag bit
1= Interrupt is pending
0= Interrupt is not pending
Note:
Interrupt flag bits are set when an interrupt
condition occurs, regardless of the state of
its corresponding enable bit or the Global
Enable bit, GIE, of the INTCON register.
User software should ensure the
appropriate interrupt flag bits are clear prior
to enabling an interrupt.
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TABLE 7-1:
Name
SUMMARY OF REGISTERS ASSOCIATED WITH INTERRUPTS
Register
on Page
Bit 7
Bit 6
Bit 5
Bit 4
Bit 3
Bit 2
Bit 1
Bit 0
INTCON
GIE
PEIE
TMR0IE
INTE
IOCIE
PSA
TMR0IF
INTF
IOCIF
76
161
77
78
79
80
81
82
OPTION_REG WPUEN INTEDG TMR0CS TMR0SE
PS<2:0>
PIE1
PIE2
PIE3
PIR1
PIR2
PIR3
TMR1GIE
OSFIE
—
ADIE
C2IE
—
RCIE
C1IE
—
TXIE
—
SSP1IE
—
TMR2IE TMR1IE
BCL1IE NCO1IE
CLC4IE CLC3IE CLC2IE CLC1IE
SSP1IF TMR2IF TMR1IF
BCL1IF NCO1IF
CLC4IF CLC3IF CLC2IF CLC1IF
—
—
—
TMR1GIF
OSFIF
—
ADIF
C2IF
—
RCIF
C1IF
—
TXIF
—
—
—
—
—
Legend: — = unimplemented location, read as ‘0’. Shaded cells are not used by interrupts.
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NOTES:
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6. Interrupts by peripherals capable of running
during Sleep (see individual peripheral for more
information)
8.0
POWER-DOWN MODE (SLEEP)
The Power-down mode is entered by executing a
SLEEPinstruction.
The first three events will cause a device Reset. The
last three events are considered a continuation of pro-
gram execution. To determine whether a device Reset
or wake-up event occurred, refer to Section 6.12
“Determining the Cause of a Reset”.
Upon entering Sleep mode, the following conditions exist:
1. WDT will be cleared but keeps running, if
enabled for operation during Sleep.
2. PD bit of the STATUS register is cleared.
3. TO bit of the STATUS register is set.
4. CPU clock is disabled.
When the SLEEPinstruction is being executed, the next
instruction (PC + 1) is prefetched. For the device to
wake-up through an interrupt event, the corresponding
interrupt enable bit must be enabled. Wake-up will
occur regardless of the state of the GIE bit. If the GIE
bit is disabled, the device continues execution at the
instruction after the SLEEPinstruction. If the GIE bit is
enabled, the device executes the instruction after the
SLEEPinstruction, the device will then call the Interrupt
Service Routine. In cases where the execution of the
instruction following SLEEP is not desirable, the user
should have a NOPafter the SLEEPinstruction.
5. 31 kHz LFINTOSC is unaffected and peripherals
that operate from it may continue operation in
Sleep.
6. Timer1 and peripherals that operate from
Timer1 continue operation in Sleep when the
Timer1 clock source selected is:
•
•
•
LFINTOSC
T1CKI
Timer1 oscillator
The WDT is cleared when the device wakes up from
Sleep, regardless of the source of wake-up.
7. ADC is unaffected, if the dedicated FRC oscillator
is selected.
8. I/O ports maintain the status they had before
SLEEPwas executed (driving high, low or high-
impedance).
8.1.1
WAKE-UP USING INTERRUPTS
When global interrupts are disabled (GIE cleared) and
any interrupt source has both its interrupt enable bit
and interrupt flag bit set, one of the following will occur:
9. Resets other than WDT are not affected by
Sleep mode.
• If the interrupt occurs before the execution of a
SLEEPinstruction
Refer to individual chapters for more details on
peripheral operation during Sleep.
- SLEEPinstruction will execute as a NOP.
- WDT and WDT prescaler will not be cleared
- TO bit of the STATUS register will not be set
To minimize current consumption, the following
conditions should be considered:
• I/O pins should not be floating
- PD bit of the STATUS register will not be
cleared.
• External circuitry sinking current from I/O pins
• Internal circuitry sourcing current from I/O pins
• Current draw from pins with internal weak pull-ups
• Modules using 31 kHz LFINTOSC
• If the interrupt occurs during or after the execu-
tion of a SLEEPinstruction
- SLEEPinstruction will be completely
executed
• CWG, NCO and CLC modules using HFINTOSC
I/O pins that are high-impedance inputs should be
pulled to VDD or VSS externally to avoid switching
currents caused by floating inputs.
- Device will immediately wake-up from Sleep
- WDT and WDT prescaler will be cleared
- TO bit of the STATUS register will be set
- PD bit of the STATUS register will be cleared
Examples of internal circuitry that might be sourcing
current include the FVR module. See Section 13.0
“Fixed Voltage Reference (FVR)” for more
information on this module.
Even if the flag bits were checked before executing a
SLEEP instruction, it may be possible for flag bits to
become set before the SLEEPinstruction completes. To
determine whether a SLEEPinstruction executed, test
the PD bit. If the PD bit is set, the SLEEP instruction
was executed as a NOP.
8.1
Wake-up from Sleep
The device can wake-up from Sleep through one of the
following events:
1. External Reset input on MCLR pin, if enabled
2. BOR Reset, if enabled
3. POR Reset
4. Watchdog Timer, if enabled
5. Any external interrupt
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FIGURE 8-1:
WAKE-UP FROM SLEEP THROUGH INTERRUPT
Q1 Q2 Q3 Q4 Q1 Q2 Q3 Q4 Q1
Q1 Q2 Q3 Q4 Q1 Q2 Q3 Q4 Q1 Q2 Q3 Q4 Q1 Q2 Q3 Q4
CLKIN(1)
(3)
CLKOUT(2)
T1OSC
Interrupt Latency(4)
Interrupt flag
GIE bit
(INTCON reg.)
Processor in
Sleep
Instruction Flow
PC
PC
PC + 1
PC + 2
PC + 2
PC + 2
0004h
0005h
Instruction
Fetched
Inst(0004h)
Inst(PC + 1)
Inst(PC + 2)
Inst(0005h)
Inst(PC) = Sleep
Instruction
Executed
Forced NOP
Forced NOP
Sleep
Inst(PC + 1)
Inst(PC - 1)
Inst(0004h)
Note 1:
External clock. High, Medium, Low mode assumed.
CLKOUT is shown here for timing reference.
T1OSC; See Section 29.0 “Electrical Specifications”.
GIE = 1assumed. In this case after wake-up, the processor calls the ISR at 0004h. If GIE = 0, execution will continue in-line.
2:
3:
4:
8.2.2
PERIPHERAL USAGE IN SLEEP
8.2
Low-Power Sleep Mode
Some peripherals that can operate in Sleep mode will
not operate properly with the Low-Power Sleep mode
selected. The LDO will remain in the Normal-Power
mode when those peripherals are enabled. The Low-
Power Sleep mode is intended for use with these
peripherals:
This device contains an internal Low Dropout (LDO)
voltage regulator, which allows the device I/O pins to
operate at voltages up to 5.5V while the internal device
logic operates at a lower voltage. The LDO and its
associated reference circuitry must remain active when
the device is in Sleep mode.
• Brown-Out Reset (BOR)
Low-Power Sleep mode allows the user to optimize the
operating current in Sleep. Low-Power Sleep mode can
be selected by setting the VREGPM bit of the
VREGCON register, putting the LDO and reference
circuitry in a low-power state whenever the device is in
Sleep.
• Watchdog Timer (WDT)
• External interrupt pin/Interrupt-on-change pins
• Timer1 (with external clock source)
The Complementary Waveform Generator (CWG), the
Numerically Controlled Oscillator (NCO) and the Con-
figurable Logic Cell (CLC) modules can utilize the
HFINTOSC oscillator as either a clock source or as an
input source. Under certain conditions, when the
HFINTOSC is selected for use with the CWG, NCO or
CLC modules, the HFINTOSC will remain active
during Sleep. This will have a direct effect on the
Sleep mode current.
8.2.1
SLEEP CURRENT VS. WAKE-UP
TIME
In the Default Operating mode, the LDO and reference
circuitry remain in the normal configuration while in
Sleep. The device is able to exit Sleep mode quickly
since all circuits remain active. In Low-Power Sleep
mode, when waking up from Sleep, an extra delay time
is required for these circuits to return to the normal con-
figuration and stabilize.
Please refer to sections Section 24.5 “Operation
During Sleep”, 25.7 “Operation In Sleep” and 26.10
“Operation During Sleep” for more information.
The Low-Power Sleep mode is beneficial for applica-
tions that stay in Sleep mode for long periods of time.
The Normal mode is beneficial for applications that
need to wake from Sleep quickly and frequently.
Note:
The PIC16LF1508/9 does not have a con-
figurable Low-Power Sleep mode.
PIC16LF1508/9 is an unregulated device
and is always in the lowest power state
when in Sleep, with no wake-up time pen-
alty. This device has a lower maximum
VDD and I/O voltage than the
PIC16F1508/9. See Section 29.0 “Elec-
trical Specifications” for more informa-
tion.
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2011-2013 Microchip Technology Inc.
PIC16(L)F1508/9
8.3
Register Definitions: Voltage Regulator Control
REGISTER 8-1:
VREGCON: VOLTAGE REGULATOR CONTROL REGISTER(1)
U-0
—
U-0
—
U-0
—
U-0
—
U-0
—
U-0
—
R/W-0/0
R/W-1/1
VREGPM
Reserved
bit 7
bit 0
Legend:
R = Readable bit
u = Bit is unchanged
‘1’ = Bit is set
W = Writable bit
x = Bit is unknown
‘0’ = Bit is cleared
U = Unimplemented bit, read as ‘0’
-n/n = Value at POR and BOR/Value at all other Resets
bit 7-2
bit 1
Unimplemented: Read as ‘0’
VREGPM: Voltage Regulator Power Mode Selection bit
1= Low-Power Sleep mode enabled in Sleep(2)
Draws lowest current in Sleep, slower wake-up
0= Normal Power mode enabled in Sleep(2)
Draws higher current in Sleep, faster wake-up
bit 0
Reserved: Read as ‘1’. Maintain this bit set.
Note 1: PIC16F1508/9 only.
2: See Section 29.0 “Electrical Specifications”.
TABLE 8-1:
Name
SUMMARY OF REGISTERS ASSOCIATED WITH POWER-DOWN MODE
Register on
Page
Bit 7
Bit 6
Bit 5
Bit 4
Bit 3
Bit 2
Bit 1
Bit 0
INTCON
IOCAF
IOCAN
IOCAP
IOCBF
IOCBN
IOCBP
GIE
—
PEIE
—
TMR0IE
INTE
IOCIE
TMR0IF
INTF
IOCIF
76
IOCAF5 IOCAF4 IOCAF3 IOCAF2 IOCAF1 IOCAF0
IOCAN5 IOCAN4 IOCAN3 IOCAN2 IOCAN1 IOCAN0
IOCAP5 IOCAP4 IOCAP3 IOCAP2 IOCAP1 IOCAP0
125
125
125
126
126
126
—
—
—
—
IOCBF7 IOCBF6 IOCBF5 IOCBF4
IOCBN7 IOCBN6 IOCBN5 IOCBN4
IOCBP7 IOCBP6 IOCBP5 IOCBP4
—
—
—
—
—
—
—
—
—
—
—
—
—
PIE1
TMR1GIE
ADIE
C2IE
—
RCIE
C1IE
—
TXIE
—
SSP1IE
TMR2IE TMR1IE
77
78
79
80
81
82
19
91
PIE2
OSFIE
—
BCL1IE NCO1IE
CLC4IE CLC3IE CLC2IE CLC1IE
SSP1IF TMR2IF TMR1IF
BCL1IF NCO1IF
—
—
PIE3
—
PIR1
TMR1GIF
OSFIF
—
ADIF
C2IF
—
RCIF
C1IF
—
TXIF
—
—
PIR2
—
CLC2IF
DC
—
CLC1IF
C
PIR3
—
CLC4IF
PD
CLC3IF
Z
STATUS
WDTCON
—
—
—
TO
—
—
WDTPS<4:0>
SWDTEN
Legend: — = unimplemented, read as ‘0’. Shaded cells are not used in Power-Down mode.
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NOTES:
DS40001609B-page 88
2011-2013 Microchip Technology Inc.
PIC16(L)F1508/9
9.0
WATCHDOG TIMER (WDT)
The Watchdog Timer is a system timer that generates
a Reset if the firmware does not issue a CLRWDT
instruction within the time-out period. The Watchdog
Timer is typically used to recover the system from
unexpected events.
The WDT has the following features:
• Independent clock source
• Multiple operating modes
- WDT is always on
- WDT is off when in Sleep
- WDT is controlled by software
- WDT is always off
• Configurable time-out period is from 1 ms to 256
seconds (nominal)
• Multiple Reset conditions
• Operation during Sleep
FIGURE 9-1:
WATCHDOG TIMER BLOCK DIAGRAM
WDTE<1:0> = 01
SWDTEN
23-bit Programmable
WDT Time-out
WDTE<1:0> = 11
LFINTOSC
Prescaler WDT
WDTE<1:0> = 10
Sleep
WDTPS<4:0>
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9.1
Independent Clock Source
9.3
Time-Out Period
The WDT derives its time base from the 31 kHz
LFINTOSC internal oscillator. Time intervals in this
chapter are based on a nominal interval of 1 ms. See
Section 29.0 “Electrical Specifications” for the
LFINTOSC tolerances.
The WDTPS bits of the WDTCON register set the
time-out period from 1 ms to 256 seconds (nominal).
After a Reset, the default time-out period is two
seconds.
9.4
Clearing the WDT
9.2
WDT Operating Modes
The WDT is cleared when any of the following condi-
tions occur:
The Watchdog Timer module has four operating modes
controlled by the WDTE<1:0> bits in Configuration
Words. See Table 9-1.
• Any Reset
• CLRWDTinstruction is executed
• Device enters Sleep
9.2.1
WDT IS ALWAYS ON
• Device wakes up from Sleep
• Oscillator fail
When the WDTE bits of Configuration Words are set to
‘11’, the WDT is always on.
• WDT is disabled
WDT protection is active during Sleep.
• Oscillator Start-up Timer (OST) is running
9.2.2
WDT IS OFF IN SLEEP
See Table 9-2 for more information.
When the WDTE bits of Configuration Words are set to
‘10’, the WDT is on, except in Sleep.
9.5
Operation During Sleep
WDT protection is not active during Sleep.
When the device enters Sleep, the WDT is cleared. If
the WDT is enabled during Sleep, the WDT resumes
counting. When the device exits Sleep, the WDT is
cleared again.
9.2.3
WDT CONTROLLED BY SOFTWARE
When the WDTE bits of Configuration Words are set to
‘01’, the WDT is controlled by the SWDTEN bit of the
WDTCON register.
The WDT remains clear until the OST, if enabled, com-
pletes. See Section 5.0 “Oscillator Module (With
Fail-Safe Clock Monitor)” for more information on the
OST.
WDT protection is unchanged by Sleep. See Table 9-1
for more details.
When a WDT time-out occurs while the device is in
Sleep, no Reset is generated. Instead, the device
wakes up and resumes operation. The TO and PD bits
in the STATUS register are changed to indicate the
event. The RWDT bit in the PCON register can also be
used. See Section 3.0 “Memory Organization” for
more information.
TABLE 9-1:
WDTE<1:0>
WDT OPERATING MODES
Device
Mode
WDT
Mode
SWDTEN
11
10
X
X
X
Active
Active
Awake
Sleep Disabled
1
0
X
X
X
X
Active
01
Disabled
Disabled
00
TABLE 9-2:
WDT CLEARING CONDITIONS
Conditions
WDT
WDTE<1:0> = 00
WDTE<1:0> = 01 and SWDTEN = 0
WDTE<1:0> = 10 and enter Sleep
CLRWDTCommand
Cleared
Oscillator Fail Detected
Exit Sleep + System Clock = T1OSC, EXTRC, INTOSC, EXTCLK
Exit Sleep + System Clock = XT, HS, LP
Cleared until the end of OST
Unaffected
Change INTOSC divider (IRCF bits)
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PIC16(L)F1508/9
9.6
Register Definitions: Watchdog Control
REGISTER 9-1:
WDTCON: WATCHDOG TIMER CONTROL REGISTER
U-0
—
U-0
—
R/W-0/0
R/W-1/1
R/W-0/0
R/W-1/1
R/W-1/1
R/W-0/0
WDTPS<4:0>
SWDTEN
bit 7
bit 0
Legend:
R = Readable bit
u = Bit is unchanged
‘1’ = Bit is set
W = Writable bit
U = Unimplemented bit, read as ‘0’
-n/n = Value at POR and BOR/Value at all other Resets
x = Bit is unknown
‘0’ = Bit is cleared
bit 7-6
bit 5-1
Unimplemented: Read as ‘0’
WDTPS<4:0>: Watchdog Timer Period Select bits(1)
Bit Value = Prescale Rate
11111 = Reserved. Results in minimum interval (1:32)
•
•
•
10011 = Reserved. Results in minimum interval (1:32)
23
10010 = 1:8388608 (2 ) (Interval 256s nominal)
22
10001 = 1:4194304 (2 ) (Interval 128s nominal)
21
10000 = 1:2097152 (2 ) (Interval 64s nominal)
20
01111 = 1:1048576 (2 ) (Interval 32s nominal)
19
01110 = 1:524288 (2 ) (Interval 16s nominal)
18
01101 = 1:262144 (2 ) (Interval 8s nominal)
17
01100 = 1:131072 (2 ) (Interval 4s nominal)
01011 = 1:65536 (Interval 2s nominal) (Reset value)
01010 = 1:32768 (Interval 1s nominal)
01001 = 1:16384 (Interval 512 ms nominal)
01000 = 1:8192 (Interval 256 ms nominal)
00111 = 1:4096 (Interval 128 ms nominal)
00110 = 1:2048 (Interval 64 ms nominal)
00101 = 1:1024 (Interval 32 ms nominal)
00100 = 1:512 (Interval 16 ms nominal)
00011 = 1:256 (Interval 8 ms nominal)
00010 = 1:128 (Interval 4 ms nominal)
00001 = 1:64 (Interval 2 ms nominal)
00000 = 1:32 (Interval 1 ms nominal)
bit 0
SWDTEN: Software Enable/Disable for Watchdog Timer bit
If WDTE<1:0> = 1x:
This bit is ignored.
If WDTE<1:0> = 01:
1= WDT is turned on
0= WDT is turned off
If WDTE<1:0> = 00:
This bit is ignored.
Note 1: Times are approximate. WDT time is based on 31 kHz LFINTOSC.
2011-2013 Microchip Technology Inc.
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TABLE 9-3:
SUMMARY OF REGISTERS ASSOCIATED WITH WATCHDOG TIMER
Register
on Page
Name
Bit 7
Bit 6
Bit 5
Bit 4
Bit 3
Bit 2
Bit 1
Bit 0
OSCCON
PCON
—
STKOVF
—
IRCF<3:0>
—
RI
Z
SCS<1:0>
60
69
19
91
STKUNF
—
—
RWDT
TO
RMCLR
PD
POR
DC
BOR
C
STATUS
WDTCON
—
—
—
WDTPS<4:0>
SWDTEN
Legend:
x= unknown, u= unchanged, – = unimplemented locations read as ‘0’. Shaded cells are not used by Watchdog Timer.
TABLE 9-4:
SUMMARY OF CONFIGURATION WORD WITH WATCHDOG TIMER
Register
on Page
Name
Bits
Bit -/7
Bit -/6
Bit 13/5
Bit 12/4
Bit 11/3
Bit 10/2
Bit 9/1
Bit 8/0
FCMEN
PWRTE
IESO
13:8
7:0
—
—
CLKOUTEN
BOREN<1:0>
FOSC<2:0>
—
CONFIG1
42
CP
MCLRE
WDTE<1:0>
Legend:
— = unimplemented location, read as ‘0’. Shaded cells are not used by Watchdog Timer.
DS40001609B-page 92
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PIC16(L)F1508/9
10.1.1
PMCON1 AND PMCON2
REGISTERS
10.0 FLASH PROGRAM MEMORY
CONTROL
PMCON1 is the control register for Flash program
memory accesses.
The Flash program memory is readable and writable
during normal operation over the full VDD range.
Program memory is indirectly addressed using Special
Function Registers (SFRs). The SFRs used to access
program memory are:
Control bits RD and WR initiate read and write,
respectively. These bits cannot be cleared, only set, in
software. They are cleared by hardware at completion
of the read or write operation. The inability to clear the
WR bit in software prevents the accidental, premature
termination of a write operation.
• PMCON1
• PMCON2
• PMDATL
• PMDATH
• PMADRL
• PMADRH
The WREN bit, when set, will allow a write operation to
occur. On power-up, the WREN bit is clear. The
WRERR bit is set when a write operation is interrupted
by a Reset during normal operation. In these situations,
following Reset, the user can check the WRERR bit
and execute the appropriate error handling routine.
When accessing the program memory, the
PMDATH:PMDATL register pair forms a 2-byte word
that holds the 14-bit data for read/write, and the
PMADRH:PMADRL register pair forms a 2-byte word
that holds the 15-bit address of the program memory
location being read.
The PMCON2 register is a write-only register. Attempting
to read the PMCON2 register will return all ‘0’s.
To enable writes to the program memory, a specific
pattern (the unlock sequence), must be written to the
PMCON2 register. The required unlock sequence
prevents inadvertent writes to the program memory
write latches and Flash program memory.
The write time is controlled by an on-chip timer. The
write/erase voltages are generated by an on-chip charge
pump rated to operate over the operating voltage range
of the device.
10.2 Flash Program Memory Overview
The Flash program memory can be protected in two
ways; by code protection (CP bit in Configuration Words)
and write protection (WRT<1:0> bits in Configuration
Words).
Code protection (CP = 0)(1), disables access, reading
and writing, to the Flash program memory via external
device programmers. Code protection does not affect
the self-write and erase functionality. Code protection
can only be reset by a device programmer performing
a Bulk Erase to the device, clearing all Flash program
memory, Configuration bits and User IDs.
It is important to understand the Flash program memory
structure for erase and programming operations. Flash
program memory is arranged in rows. A row consists of
a fixed number of 14-bit program memory words. A row
is the minimum size that can be erased by user software.
After a row has been erased, the user can reprogram
all or a portion of this row. Data to be written into the
program memory row is written to 14-bit wide data write
latches. These write latches are not directly accessible
to the user, but may be loaded via sequential writes to
the PMDATH:PMDATL register pair.
Write protection prohibits self-write and erase to a
portion or all of the Flash program memory, as defined
by the bits WRT<1:0>. Write protection does not affect
a device programmers ability to read, write or erase the
device.
Note:
If the user wants to modify only a portion
of a previously programmed row, then the
contents of the entire row must be read
and saved in RAM prior to the erase.
Then, new data and retained data can be
written into the write latches to reprogram
the row of Flash program memory. How-
ever, any unprogrammed locations can be
written without first erasing the row. In this
case, it is not necessary to save and
rewrite the other previously programmed
locations.
Note 1: Code protection of the entire Flash
program memory array is enabled by
clearing the CP bit of Configuration Words.
10.1 PMADRL and PMADRH Registers
The PMADRH:PMADRL register pair can address up
to a maximum of 32K words of program memory. When
selecting a program address value, the MSB of the
address is written to the PMADRH register and the LSB
is written to the PMADRL register.
See Table 10-1 for Erase Row size and the number of
write latches for Flash program memory.
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PIC16(L)F1508/9
FIGURE 10-1:
FLASH PROGRAM
MEMORY READ
FLOWCHART
TABLE 10-1: FLASH MEMORY
ORGANIZATION BY DEVICE
Write
Latches
(words)
Row Erase
(words)
Device
Start
Read Operation
PIC16(L)F1508
PIC16(L)F1509
32
32
Select
Program or Configuration Memory
(CFGS)
10.2.1
READING THE FLASH PROGRAM
MEMORY
To read a program memory location, the user must:
1. Write the desired address to the
PMADRH:PMADRL register pair.
2. Clear the CFGS bit of the PMCON1 register.
Select
Word Address
(PMADRH:PMADRL)
3. Then, set control bit RD of the PMCON1 register.
Initiate Read operation
Once the read control bit is set, the program memory
Flash controller will use the second instruction cycle to
read the data. This causes the second instruction
immediately following the “BSF PMCON1,RD” instruction
to be ignored. The data is available in the very next cycle,
in the PMDATH:PMDATL register pair; therefore, it can
be read as two bytes in the following instructions.
(RD = 1)
Instruction Fetched ignored
NOPexecution forced
PMDATH:PMDATL register pair will hold this value until
another read or until it is written to by the user.
Instruction Fetched ignored
NOPexecution forced
Note:
The two instructions following a program
memory read are required to be NOPs.
This prevents the user from executing a
2-cycle instruction on the next instruction
after the RD bit is set.
Data read now in
PMDATH:PMDATL
End
Read Operation
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PIC16(L)F1508/9
FIGURE 10-2:
FLASH PROGRAM MEMORY READ CYCLE EXECUTION
Q1 Q2 Q3 Q4 Q1 Q2 Q3 Q4 Q1 Q2 Q3 Q4 Q1 Q2 Q3 Q4 Q1 Q2 Q3 Q4 Q1 Q2 Q3 Q4
PC
PC + 1
PMADRH,PMADRL
PC + 3
PC + 4
PC + 5
Flash ADDR
Flash Data
INSTR (PC)
INSTR (PC + 1)
PMDATH,PMDATL
INSTR (PC + 3)
INSTR (PC + 4)
INSTR(PC + 1)
INSTR(PC + 2)
instruction ignored instruction ignored
BSF PMCON1,RD
executed here
INSTR(PC - 1)
executed here
INSTR(PC + 3)
executed here
INSTR(PC + 4)
executed here
Forced NOP
Forced NOP
executed here
executed here
RD bit
PMDATH
PMDATL
Register
EXAMPLE 10-1:
FLASH PROGRAM MEMORY READ
* This code block will read 1 word of program
* memory at the memory address:
PROG_ADDR_HI : PROG_ADDR_LO
*
*
data will be returned in the variables;
PROG_DATA_HI, PROG_DATA_LO
BANKSEL PMADRL
; Select Bank for PMCON registers
MOVLW
MOVWF
MOVLW
MOVWF
PROG_ADDR_LO
PMADRL
PROG_ADDR_HI
PMADRH
;
; Store LSB of address
;
; Store MSB of address
BCF
BSF
NOP
NOP
PMCON1,CFGS
PMCON1,RD
; Do not select Configuration Space
; Initiate read
; Ignored (Figure 10-2)
; Ignored (Figure 10-2)
MOVF
PMDATL,W
; Get LSB of word
MOVWF
MOVF
PROG_DATA_LO
PMDATH,W
; Store in user location
; Get MSB of word
MOVWF
PROG_DATA_HI
; Store in user location
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10.2.2
FLASH MEMORY UNLOCK
SEQUENCE
FIGURE 10-3:
FLASH PROGRAM
MEMORY UNLOCK
SEQUENCE FLOWCHART
The unlock sequence is a mechanism that protects the
Flash program memory from unintended self-write pro-
gramming or erasing. The sequence must be executed
and completed without interruption to successfully
complete any of the following operations:
Start
Unlock Sequence
• Row Erase
• Load program memory write latches
Write 055h to
PMCON2
• Write of program memory write latches to
program memory
• Write of program memory write latches to User
IDs
Write 0AAh to
PMCON2
The unlock sequence consists of the following steps:
1. Write 55h to PMCON2
Initiate
Write or Erase operation
(WR = 1)
2. Write AAh to PMCON2
3. Set the WR bit in PMCON1
4. NOPinstruction
5. NOPinstruction
Instruction Fetched ignored
NOP execution forced
Once the WR bit is set, the processor will always force
two NOP instructions. When an Erase Row or Program
Row operation is being performed, the processor will stall
internal operations (typical 2 ms), until the operation is
complete and then resume with the next instruction.
When the operation is loading the program memory write
latches, the processor will always force the two NOP
instructions and continue uninterrupted with the next
instruction.
Instruction Fetched ignored
NOPexecution forced
End
Unlock Sequence
Since the unlock sequence must not be interrupted,
global interrupts should be disabled prior to the unlock
sequence and re-enabled after the unlock sequence is
completed.
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PIC16(L)F1508/9
10.2.3
ERASING FLASH PROGRAM
MEMORY
FIGURE 10-4:
FLASH PROGRAM
MEMORY ERASE
FLOWCHART
While executing code, program memory can only be
erased by rows. To erase a row:
1. Load the PMADRH:PMADRL register pair with
any address within the row to be erased.
Start
Erase Operation
2. Clear the CFGS bit of the PMCON1 register.
3. Set the FREE and WREN bits of the PMCON1
register.
Disable Interrupts
(GIE = 0)
4. Write 55h, then AAh, to PMCON2 (Flash
programming unlock sequence).
5. Set control bit WR of the PMCON1 register to
begin the erase operation.
Select
Program or Configuration Memory
(CFGS)
See Example 10-2.
After the “BSF PMCON1,WR” instruction, the processor
requires two cycles to set up the erase operation. The
user must place two NOPinstructions immediately fol-
lowing the WR bit set instruction. The processor will
halt internal operations for the typical 2 ms erase time.
This is not Sleep mode as the clocks and peripherals
will continue to run. After the erase cycle, the processor
will resume operation with the third instruction after the
PMCON1 write instruction.
Select Row Address
(PMADRH:PMADRL)
Select Erase Operation
(FREE = 1)
Enable Write/Erase Operation
(WREN = 1)
Unlock Sequence
Figure 10-3
CPU stalls while
Erase operation completes
(2 ms typical)
Disable Write/Erase Operation
(WREN = 0)
Re-enable Interrupts
(GIE = 1)
End
Erase Operation
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EXAMPLE 10-2:
ERASING ONE ROW OF PROGRAM MEMORY
; This row erase routine assumes the following:
; 1. A valid address within the erase row is loaded in ADDRH:ADDRL
; 2. ADDRH and ADDRL are located in shared data memory 0x70 - 0x7F (common RAM)
BCF
INTCON,GIE
PMADRL
ADDRL,W
PMADRL
ADDRH,W
; Disable ints so required sequences will execute properly
; Load lower 8 bits of erase address boundary
; Load upper 6 bits of erase address boundary
BANKSEL
MOVF
MOVWF
MOVF
MOVWF
BCF
PMADRH
PMCON1,CFGS
PMCON1,FREE
PMCON1,WREN
; Not configuration space
; Specify an erase operation
; Enable writes
BSF
BSF
MOVLW
MOVWF
MOVLW
MOVWF
BSF
55h
PMCON2
0AAh
PMCON2
PMCON1,WR
; Start of required sequence to initiate erase
; Write 55h
;
; Write AAh
; Set WR bit to begin erase
NOP
NOP
; NOP instructions are forced as processor starts
; row erase of program memory.
;
; The processor stalls until the erase process is complete
; after erase processor continues with 3rd instruction
BCF
BSF
PMCON1,WREN
INTCON,GIE
; Disable writes
; Enable interrupts
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The following steps should be completed to load the
write latches and program a row of program memory.
These steps are divided into two parts. First, each write
latch is loaded with data from the PMDATH:PMDATL
using the unlock sequence with LWLO = 1. When the
last word to be loaded into the write latch is ready, the
LWLO bit is cleared and the unlock sequence
executed. This initiates the programming operation,
writing all the latches into Flash program memory.
10.2.4
WRITING TO FLASH PROGRAM
MEMORY
Program memory is programmed using the following
steps:
1. Load the address in PMADRH:PMADRL of the
row to be programmed.
2. Load each write latch with data.
3. Initiate a programming operation.
4. Repeat steps 1 through 3 until all data is written.
Note:
The special unlock sequence is required
to load a write latch with data or initiate a
Flash programming operation. If the
unlock sequence is interrupted, writing to
the latches or program memory will not be
initiated.
Before writing to program memory, the word(s) to be
written must be erased or previously unwritten. Pro-
gram memory can only be erased one row at a time. No
automatic erase occurs upon the initiation of the write.
Program memory can be written one or more words at
a time. The maximum number of words written at one
time is equal to the number of write latches. See
Figure 10-5 (row writes to program memory with 32
write latches) for more details.
1. Set the WREN bit of the PMCON1 register.
2. Clear the CFGS bit of the PMCON1 register.
3. Set the LWLO bit of the PMCON1 register.
When the LWLO bit of the PMCON1 register is
‘1’, the write sequence will only load the write
latches and will not initiate the write to Flash
program memory.
The write latches are aligned to the Flash row address
boundary defined by the upper 10-bits of
PMADRH:PMADRL, (PMADRH<6:0>:PMADRL<7:5>)
with the lower five bits of PMADRL, (PMADRL<4:0>)
determining the write latch being loaded. Write opera-
tions do not cross these boundaries. At the completion
of a program memory write operation, the data in the
write latches is reset to contain 0x3FFF.
4. Load the PMADRH:PMADRL register pair with
the address of the location to be written.
5. Load the PMDATH:PMDATL register pair with
the program memory data to be written.
6. Execute the unlock sequence (Section 10.2.2
“Flash Memory Unlock Sequence”). The write
latch is now loaded.
7. Increment the PMADRH:PMADRL register pair
to point to the next location.
8. Repeat steps 5 through 7 until all but the last
write latch has been loaded.
9. Clear the LWLO bit of the PMCON1 register.
When the LWLO bit of the PMCON1 register is
‘0’, the write sequence will initiate the write to
Flash program memory.
10. Load the PMDATH:PMDATL register pair with
the program memory data to be written.
11. Execute the unlock sequence (Section 10.2.2
“Flash Memory Unlock Sequence”). The
entire program memory latch content is now
written to Flash program memory.
Note:
The program memory write latches are
reset to the blank state (0x3FFF) at the
completion of every write or erase
operation. As a result, it is not necessary
to load all the program memory write
latches. Unloaded latches will remain in
the blank state.
An example of the complete write sequence is shown in
Example 10-3. The initial address is loaded into the
PMADRH:PMADRL register pair; the data is loaded
using indirect addressing.
2011-2013 Microchip Technology Inc.
DS40001609B-page 99
FIGURE 10-5:
BLOCK WRITES TO FLASH PROGRAM MEMORY WITH 32 WRITE LATCHES
Rev. 10-000004A_A0
7
6
0 7
5 4
0
7
5
0
7
0
-
-
PMADRH
PMADRL
PMDATH
PMDATL
-
r9
r8
r7
r6
r5
r4
r3
r2
r1
r0
c4
c3
c2
c1
c0
6
8
14
Program Memory Write Latches
14 14
5
10
14
14
Write Latch #0 Write Latch #1
00h 01h
Write Latch #30
1Eh
Write Latch #31
1Fh
PMADRL<4:0>
14
14
14
14
Addr
Addr
Row
Addr
Addr
0001h
0021h
0041h
000h
001h
002h
0000h
0020h
0040h
001Fh
003Fh
005Fh
001Eh
003Eh
005Eh
CFGS = 0
3FEh
3FFh
7FC0h
7FE0h
7FC1h
7FE1h
7FDEh
7FFEh
7FDFh
7FFFh
Row
Address
Decode
PMADRH<6:0>:
PMADRL<7:5>
Flash Program Memory
400h 8000h - 8003h
USER ID 0 - 3
8004h – 8005h
reserved
8006h
8007h – 8008h
8009h - 801Fh
reserved
DEVICE ID
Dev / Rev
Configuration
Words
CFGS = 1
Configuration Memory
PIC16(L)F1508/9
FIGURE 10-6:
FLASH PROGRAM MEMORY WRITE FLOWCHART
Start
Write Operation
Determine number of words
to be written into Program or
Configuration Memory.
The number of words cannot
exceed the number of words
per row.
Enable Write/Erase
Operation (WREN = 1)
Load the value to write
(PMDATH:PMDATL)
(word_cnt)
Update the word counter
(word_cnt--)
Write Latches to Flash
Disable Interrupts
(LWLO = 0)
(GIE = 0)
Unlock Sequence
Figure 10-3
Select
Program or Config. Memory
(CFGS)
Yes
Last word to
write ?
CPU stalls while Write
operation completes
(2 ms typical)
No
Select Row Address
(PMADRH:PMADRL)
Unlock Sequence
Figure 10-3
Select Write Operation
(FREE = 0)
Disable
Write/Erase Operation
(WREN = 0)
No delay when writing to
Program Memory Latches
Load Write Latches Only
(LWLO = 1)
Re-enable Interrupts
(GIE = 1)
Increment Address
(PMADRH:PMADRL++)
End
Write Operation
2011-2013 Microchip Technology Inc.
DS40001609B-page 101
PIC16(L)F1508/9
EXAMPLE 10-3:
WRITING TO FLASH PROGRAM MEMORY (32 WRITE LATCHES)
; This write routine assumes the following:
; 1. 64 bytes of data are loaded, starting at the address in DATA_ADDR
; 2. Each word of data to be written is made up of two adjacent bytes in DATA_ADDR,
; stored in little endian format
; 3. A valid starting address (the Least Significant bits = 00000) is loaded in ADDRH:ADDRL
; 4. ADDRH and ADDRL are located in shared data memory 0x70 - 0x7F (common RAM)
;
BCF
INTCON,GIE
PMADRH
ADDRH,W
PMADRH
ADDRL,W
PMADRL
; Disable ints so required sequences will execute properly
; Bank 3
; Load initial address
;
;
;
BANKSEL
MOVF
MOVWF
MOVF
MOVWF
MOVLW
MOVWF
MOVLW
MOVWF
BCF
LOW DATA_ADDR ; Load initial data address
FSR0L
HIGH DATA_ADDR ; Load initial data address
;
FSR0H
;
PMCON1,CFGS
PMCON1,WREN
PMCON1,LWLO
; Not configuration space
; Enable writes
; Only Load Write Latches
BSF
BSF
LOOP
MOVIW
MOVWF
MOVIW
MOVWF
FSR0++
PMDATL
FSR0++
PMDATH
; Load first data byte into lower
;
; Load second data byte into upper
;
MOVF
PMADRL,W
0x1F
0x1F
STATUS,Z
START_WRITE
; Check if lower bits of address are '00000'
; Check if we're on the last of 32 addresses
;
; Exit if last of 32 words,
;
XORLW
ANDLW
BTFSC
GOTO
MOVLW
MOVWF
MOVLW
MOVWF
BSF
55h
PMCON2
0AAh
PMCON2
PMCON1,WR
; Start of required write sequence:
; Write 55h
;
; Write AAh
; Set WR bit to begin write
; NOP instructions are forced as processor
; loads program memory write latches
;
NOP
NOP
INCF
GOTO
PMADRL,F
LOOP
; Still loading latches Increment address
; Write next latches
START_WRITE
BCF
PMCON1,LWLO
; No more loading latches - Actually start Flash program
; memory write
MOVLW
55h
PMCON2
0AAh
PMCON2
PMCON1,WR
; Start of required write sequence:
; Write 55h
;
MOVWF
MOVLW
MOVWF
BSF
; Write AAh
; Set WR bit to begin write
; NOP instructions are forced as processor writes
; all the program memory write latches simultaneously
; to program memory.
NOP
NOP
; After NOPs, the processor
; stalls until the self-write process in complete
; after write processor continues with 3rd instruction
; Disable writes
BCF
BSF
PMCON1,WREN
INTCON,GIE
; Enable interrupts
DS40001609B-page 102
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PIC16(L)F1508/9
FIGURE 10-7:
FLASH PROGRAM
MEMORY MODIFY
FLOWCHART
10.3 Modifying Flash Program Memory
When modifying existing data in a program memory
row, and data within that row must be preserved, it
must first be read and saved in a RAM image. Program
memory is modified using the following steps:
Start
Modify Operation
1. Load the starting address of the row to be
modified.
2. Read the existing data from the row into a RAM
image.
Read Operation
Figure 10-2
3. Modify the RAM image to contain the new data
to be written into program memory.
4. Load the starting address of the row to be
rewritten.
An image of the entire row read
must be stored in RAM
5. Erase the program memory row.
6. Load the write latches with data from the RAM
image.
7. Initiate a programming operation.
Modify Image
The words to be modified are
changed in the RAM image
Erase Operation
r)
Figure 10-4
Write Operation
use RAM image
Figure 10-5
End
Modify Operation
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10.4 User ID, Device ID and
Configuration Word Access
Instead of accessing program memory, the User ID’s,
Device ID/Revision ID and Configuration Words can be
accessed when CFGS = 1 in the PMCON1 register.
This is the region that would be pointed to by
PC<15> = 1, but not all addresses are accessible.
Different access may exist for reads and writes. Refer
to Table 10-2.
When read access is initiated on an address outside
the
parameters
listed
in
Table 10-2,
the
PMDATH:PMDATL register pair is cleared, reading
back ‘0’s.
TABLE 10-2: USER ID, DEVICE ID AND CONFIGURATION WORD ACCESS (CFGS = 1)
Address
Function
Read Access
Write Access
8000h-8003h
8006h
User IDs
Yes
Yes
Yes
Yes
No
No
Device ID/Revision ID
Configuration Words 1 and 2
8007h-8008h
EXAMPLE 10-4:
CONFIGURATION WORD AND DEVICE ID ACCESS
* This code block will read 1 word of program memory at the memory address:
*
*
PROG_ADDR_LO (must be 00h-08h) data will be returned in the variables;
PROG_DATA_HI, PROG_DATA_LO
BANKSEL PMADRL
; Select correct Bank
;
; Store LSB of address
; Clear MSB of address
MOVLW
MOVWF
CLRF
PROG_ADDR_LO
PMADRL
PMADRH
BSF
BCF
BSF
NOP
NOP
BSF
PMCON1,CFGS
INTCON,GIE
PMCON1,RD
; Select Configuration Space
; Disable interrupts
; Initiate read
; Executed (See Figure 10-2)
; Ignored (See Figure 10-2)
; Restore interrupts
INTCON,GIE
MOVF
PMDATL,W
; Get LSB of word
MOVWF
MOVF
PROG_DATA_LO
PMDATH,W
; Store in user location
; Get MSB of word
MOVWF
PROG_DATA_HI
; Store in user location
DS40001609B-page 104
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PIC16(L)F1508/9
10.5 Write Verify
It is considered good programming practice to verify that
program memory writes agree with the intended value.
Since program memory is stored as a full page then the
stored program memory contents are compared with
the intended data stored in RAM after the last write is
complete.
FIGURE 10-8:
FLASH PROGRAM
MEMORY VERIFY
FLOWCHART
Start
Verify Operation
This routine assumes that the last row
of data written was from an image
saved in RAM. This image will be used
to verify the data currently stored in
Flash Program Memory.
Read Operation
Figure 10-2
PMDAT =
RAM image
?
No
Fail
Verify Operation
Yes
No
Last
Word ?
Yes
End
Verify Operation
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PIC16(L)F1508/9
10.6 Register Definitions: Flash Program Memory Control
REGISTER 10-1: PMDATL: PROGRAM MEMORY DATA LOW BYTE REGISTER
R/W-x/u
R/W-x/u
R/W-x/u
R/W-x/u
R/W-x/u
R/W-x/u
R/W-x/u
R/W-x/u
PMDAT<7:0>
bit 7
bit 0
Legend:
R = Readable bit
u = Bit is unchanged
‘1’ = Bit is set
W = Writable bit
x = Bit is unknown
‘0’ = Bit is cleared
U = Unimplemented bit, read as ‘0’
-n/n = Value at POR and BOR/Value at all other Resets
bit 7-0
PMDAT<7:0>: Read/write value for Least Significant bits of program memory
REGISTER 10-2: PMDATH: PROGRAM MEMORY DATA HIGH BYTE REGISTER
U-0
—
U-0
—
R/W-x/u
R/W-x/u
R/W-x/u
R/W-x/u
R/W-x/u
R/W-x/u
PMDAT<13:8>
bit 7
bit 0
Legend:
R = Readable bit
u = Bit is unchanged
‘1’ = Bit is set
W = Writable bit
x = Bit is unknown
‘0’ = Bit is cleared
U = Unimplemented bit, read as ‘0’
-n/n = Value at POR and BOR/Value at all other Resets
bit 7-6
bit 5-0
Unimplemented: Read as ‘0’
PMDAT<13:8>: Read/write value for Most Significant bits of program memory
REGISTER 10-3: PMADRL: PROGRAM MEMORY ADDRESS LOW BYTE REGISTER
R/W-0/0
R/W-0/0
R/W-0/0
R/W-0/0
R/W-0/0
R/W-0/0
R/W-0/0
R/W-0/0
PMADR<7:0>
bit 7
bit 0
Legend:
R = Readable bit
u = Bit is unchanged
‘1’ = Bit is set
W = Writable bit
x = Bit is unknown
‘0’ = Bit is cleared
U = Unimplemented bit, read as ‘0’
-n/n = Value at POR and BOR/Value at all other Resets
bit 7-0
PMADR<7:0>: Specifies the Least Significant bits for program memory address
REGISTER 10-4: PMADRH: PROGRAM MEMORY ADDRESS HIGH BYTE REGISTER
U-1
R/W-0/0
R/W-0/0
R/W-0/0
R/W-0/0
R/W-0/0
R/W-0/0
R/W-0/0
(1)
—
PMADR<14:8>
bit 7
bit 0
Legend:
R = Readable bit
u = Bit is unchanged
‘1’ = Bit is set
W = Writable bit
x = Bit is unknown
‘0’ = Bit is cleared
U = Unimplemented bit, read as ‘0’
-n/n = Value at POR and BOR/Value at all other Resets
bit 7
Unimplemented: Read as ‘1’
bit 6-0
PMADR<14:8>: Specifies the Most Significant bits for program memory address
Note 1:
Unimplemented, read as ‘1’.
DS40001609B-page 106
2011-2013 Microchip Technology Inc.
PIC16(L)F1508/9
REGISTER 10-5: PMCON1: PROGRAM MEMORY CONTROL 1 REGISTER
U-1
R/W-0/0
CFGS
R/W-0/0
LWLO
R/W/HC-0/0 R/W/HC-x/q(2)
FREE WRERR
R/W-0/0
WREN
R/S/HC-0/0
WR
R/S/HC-0/0
RD
(1)
—
bit 7
bit 0
Legend:
R = Readable bit
W = Writable bit
x = Bit is unknown
‘0’ = Bit is cleared
U = Unimplemented bit, read as ‘0’
S = Bit can only be set
‘1’ = Bit is set
-n/n = Value at POR and BOR/Value at all other Resets
HC = Bit is cleared by hardware
bit 7
bit 6
Unimplemented: Read as ‘1’
CFGS: Configuration Select bit
1= Access Configuration, User ID and Device ID Registers
0= Access Flash program memory
bit 5
LWLO: Load Write Latches Only bit(3)
1= Only the addressed program memory write latch is loaded/updated on the next WR command
0= The addressed program memory write latch is loaded/updated and a write of all program memory write latches
will be initiated on the next WR command
bit 4
bit 3
FREE: Program Flash Erase Enable bit
1= Performs an erase operation on the next WR command (hardware cleared upon completion)
0= Performs a write operation on the next WR command
WRERR: Program/Erase Error Flag bit
1= Condition indicates an improper program or erase sequence attempt or termination (bit is set automatically
on any set attempt (write ‘1’) of the WR bit).
0= The program or erase operation completed normally.
bit 2
bit 1
WREN: Program/Erase Enable bit
1= Allows program/erase cycles
0= Inhibits programming/erasing of program Flash
WR: Write Control bit
1= Initiates a program Flash program/erase operation.
The operation is self-timed and the bit is cleared by hardware once operation is complete.
The WR bit can only be set (not cleared) in software.
0= Program/erase operation to the Flash is complete and inactive.
bit 0
RD: Read Control bit
1= Initiates a program Flash read. Read takes one cycle. RD is cleared in hardware. The RD bit can only be set
(not cleared) in software.
0= Does not initiate a program Flash read.
Note 1: Unimplemented bit, read as ‘1’.
2: The WRERR bit is automatically set by hardware when a program memory write or erase operation is started (WR = 1).
3: The LWLO bit is ignored during a program memory erase operation (FREE = 1).
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PIC16(L)F1508/9
REGISTER 10-6: PMCON2: PROGRAM MEMORY CONTROL 2 REGISTER
W-0/0
W-0/0
W-0/0
W-0/0
W-0/0
W-0/0
W-0/0
W-0/0
bit 0
Program Memory Control Register 2
bit 7
Legend:
R = Readable bit
W = Writable bit
x = Bit is unknown
‘0’ = Bit is cleared
U = Unimplemented bit, read as ‘0’
-n/n = Value at POR and BOR/Value at all other Resets
S = Bit can only be set
‘1’ = Bit is set
bit 7-0
Flash Memory Unlock Pattern bits
To unlock writes, a 55h must be written first, followed by an AAh, before setting the WR bit of the
PMCON1 register. The value written to this register is used to unlock the writes. There are specific
timing requirements on these writes.
TABLE 10-3: SUMMARY OF REGISTERS ASSOCIATED WITH FLASH PROGRAM MEMORY
Register on
Page
Name
Bit 7
Bit 6
Bit 5
Bit 4
Bit 3
Bit 2
Bit 1
Bit 0
INTCON
PMCON1
PMCON2
PMADRL
GIE
PEIE
TMR0IE
LWLO
INTE
IOCIE
TMR0IF
WREN
INTF
WR
IOCIF
RD
76
(1)
CFGS
FREE
WRERR
—
107
108
106
106
106
106
Program Memory Control Register 2
PMADRL<7:0>
(1)
PMADRH
PMDATL
—
PMADRH<6:0>
PMDATL<7:0>
PMDATH
—
—
PMDATH<5:0>
Legend:
— = unimplemented location, read as ‘0’. Shaded cells are not used by Flash program memory.
Note 1: Unimplemented, read as ‘1’.
TABLE 10-4: SUMMARY OF CONFIGURATION WORD WITH FLASH PROGRAM MEMORY
Register
on Page
Name
Bits
Bit -/7
Bit -/6
Bit 13/5
Bit 12/4
Bit 11/3
Bit 10/2
Bit 9/1
Bit 8/0
FCMEN
PWRTE
LVP
IESO
13:8
7:0
—
CP
—
—
MCLRE
—
CLKOUTEN
BOREN<1:0>
—
CONFIG1
42
44
WDTE<1:0>
FOSC<2:0>
STVREN
13:8
7:0
DEBUG
—
LPBOR
—
BORV
—
—
CONFIG2
—
—
—
WRT<1:0>
Legend:
— = unimplemented location, read as ‘0’. Shaded cells are not used by Flash program memory.
DS40001609B-page 108
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PIC16(L)F1508/9
FIGURE 11-1:
GENERIC I/O PORT
OPERATION
11.0 I/O PORTS
Each port has three standard registers for its operation.
These registers are:
• TRISx registers (data direction)
Read LATx
• PORTx registers (reads the levels on the pins of
the device)
TRISx
D
Q
• LATx registers (output latch)
Write LATx
Write PORTx
Some ports may have one or more of the following
additional registers. These registers are:
CK
Data Register
VDD
• ANSELx (analog select)
• WPUx (weak pull-up)
Data Bus
In general, when a peripheral is enabled on a port pin,
that pin cannot be used as a general purpose output.
However, the pin can still be read.
I/O pin
Read PORTx
To digital peripherals
To analog peripherals
VSS
ANSELx
TABLE 11-1: PORT AVAILABILITY PER
DEVICE
Device
PIC16(L)F1508/9
●
●
●
The Data Latch (LATx registers) is useful for
read-modify-write operations on the value that the I/O
pins are driving.
A write operation to the LATx register has the same
effect as a write to the corresponding PORTx register.
A read of the LATx register reads of the values held in
the I/O PORT latches, while a read of the PORTx
register reads the actual I/O pin value.
Ports that support analog inputs have an associated
ANSELx register. When an ANSEL bit is set, the digital
input buffer associated with that bit is disabled.
Disabling the input buffer prevents analog signal levels
on the pin between a logic high and low from causing
excessive current in the logic input circuitry. A
simplified model of a generic I/O port, without the
interfaces to other peripherals, is shown in Figure 11-1.
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These bits have no effect on the values of any TRIS
register. PORT and TRIS overrides will be routed to the
correct pin. The unselected pin will be unaffected.
11.1 Alternate Pin Function
The Alternate Pin Function Control (APFCON) register
is used to steer specific peripheral input and output
functions between different pins. The APFCON register
is shown in Register 11-1. For this device family, the
following functions can be moved between different
pins.
• SS
• T1G
• CLC1
• NCO1
11.2 Register Definitions: Alternate Pin Function Control
REGISTER 11-1: APFCON: ALTERNATE PIN FUNCTION CONTROL REGISTER
U-0
—
U-0
—
U-0
—
R/W-0/0
SSSEL
R/W-0/0
T1GSEL
U-0
—
R/W-0/0
R/W-0/0
CLC1SEL
NCO1SEL
bit 7
bit 0
Legend:
R = Readable bit
u = Bit is unchanged
‘1’ = Bit is set
W = Writable bit
U = Unimplemented bit, read as ‘0’
x = Bit is unknown
‘0’ = Bit is cleared
-n/n = Value at POR and BOR/Value at all other Resets
bit 7-5
bit 4
Unimplemented: Read as ‘0’
SSSEL: Pin Selection bit
1= SS function is on RA3
0= SS function is on RC6
bit 3
T1GSEL: Pin Selection bit
1= T1G function is on RA3
0= T1G function is on RA4
bit 2
bit 1
Unimplemented: Read as ‘0’
CLC1SEL: Pin Selection bit
1= CLC1 function is on RC5
0= CLC1 function is on RA2
bit 0
NCO1SEL: Pin Selection bit
1= NCO1 function is on RC6
0= NCO1 function is on RC1
DS40001609B-page 110
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PIC16(L)F1508/9
11.3.4
PORTA FUNCTIONS AND OUTPUT
PRIORITIES
11.3 PORTA Registers
11.3.1 DATA REGISTER
Each PORTA pin is multiplexed with other functions. The
pins, their combined functions and their output priorities
are shown in Table 11-2.
PORTA is a 6-bit wide, bidirectional port. The
corresponding data direction register is TRISA
(Register 11-3). Setting a TRISA bit (= 1) will make the
corresponding PORTA pin an input (i.e., disable the
output driver). Clearing a TRISA bit (= 0) will make the
corresponding PORTA pin an output (i.e., enables
output driver and puts the contents of the output latch
on the selected pin). The exception is RA3, which is
input-only and its TRIS bit will always read as ‘1’.
Example 11-1 shows how to initialize an I/O port.
When multiple outputs are enabled, the actual pin
control goes to the peripheral with the highest priority.
Analog input functions, such as ADC and comparator
inputs, are not shown in the priority lists. These inputs
are active when the I/O pin is set for Analog mode using
the ANSELx registers. Digital output functions may
control the pin when it is in Analog mode with the
priority shown below in Table 11-2.
Reading the PORTA register (Register 11-2) reads the
status of the pins, whereas writing to it will write to the
PORT latch. All write operations are read-modify-write
operations. Therefore, a write to a port implies that the
port pins are read, this value is modified and then
written to the PORT data latch (LATA).
TABLE 11-2: PORTA OUTPUT PRIORITY
(1)
Pin Name
Function Priority
RA0
ICSPDAT
DAC1OUT1
RA0
11.3.2
DIRECTION CONTROL
RA1
RA2
RA1
The TRISA register (Register 11-3) controls the
PORTA pin output drivers, even when they are being
used as analog inputs. The user should ensure the bits
in the TRISA register are maintained set when using
them as analog inputs. I/O pins configured as analog
input always read ‘0’.
DAC1OUT2
CLC1(2)
C1OUT
PWM3
RA2
RA3
RA4
None
CLKOUT
SOSCO
RA4
11.3.3
ANALOG CONTROL
The ANSELA register (Register 11-5) is used to
configure the Input mode of an I/O pin to analog.
Setting the appropriate ANSELA bit high will cause all
digital reads on the pin to be read as ‘0’ and allow
analog functions on the pin to operate correctly.
RA5
SOSCI
RA5
Note 1: Priority listed from highest to lowest.
2: Default pin (see APFCON register).
3: Alternate pin (see APFCON register).
The state of the ANSELA bits has no effect on digital
output functions. A pin with TRIS clear and ANSEL set
will still operate as a digital output, but the Input mode
will be analog. This can cause unexpected behavior
when executing read-modify-write instructions on the
affected port.
Note:
The ANSELA bits default to the Analog
mode after Reset. To use any pins as
digital general purpose or peripheral
inputs, the corresponding ANSEL bits
must be initialized to ‘0’ by user software.
EXAMPLE 11-1:
INITIALIZING PORTA
BANKSEL PORTA
;
CLRF
BANKSEL LATA
CLRF LATA
BANKSEL ANSELA
CLRF ANSELA
BANKSEL TRISA
PORTA
;Init PORTA
;Data Latch
;
;
;digital I/O
;
MOVLW
MOVWF
B'00111000' ;Set RA<5:3> as inputs
TRISA
;and set RA<2:0> as
;outputs
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11.4 Register Definitions: PORTA
REGISTER 11-2: PORTA: PORTA REGISTER
U-0
—
U-0
—
R/W-x/x
RA5
R/W-x/x
RA4
R-x/x
RA3
R/W-x/x
RA2
R/W-x/x
RA1
R/W-x/x
RA0
bit 7
bit 0
Legend:
R = Readable bit
u = Bit is unchanged
‘1’ = Bit is set
W = Writable bit
U = Unimplemented bit, read as ‘0’
-n/n = Value at POR and BOR/Value at all other Resets
x = Bit is unknown
‘0’ = Bit is cleared
bit 7-6
bit 5-0
Unimplemented: Read as ‘0’
RA<5:0>: PORTA I/O Value bits(1)
1= Port pin is > VIH
0= Port pin is < VIL
Note 1: Writes to PORTA are actually written to corresponding LATA register. Reads from PORTA register is return
of actual I/O pin values.
REGISTER 11-3: TRISA: PORTA TRI-STATE REGISTER
U-0
—
U-0
—
R/W-1/1
TRISA5
R/W-1/1
TRISA4
U-1
R/W-1/1
TRISA2
R/W-1/1
TRISA1
R/W-1/1
TRISA0
(1)
—
bit 7
bit 0
Legend:
R = Readable bit
u = Bit is unchanged
‘1’ = Bit is set
W = Writable bit
U = Unimplemented bit, read as ‘0’
-n/n = Value at POR and BOR/Value at all other Resets
x = Bit is unknown
‘0’ = Bit is cleared
bit 7-6
bit 5-4
Unimplemented: Read as ‘0’
TRISA<5:4>: PORTA Tri-State Control bit
1= PORTA pin configured as an input (tri-stated)
0= PORTA pin configured as an output
bit 3
Unimplemented: Read as ‘1’
bit 2-0
TRISA<2:0>: PORTA Tri-State Control bit
1= PORTA pin configured as an input (tri-stated)
0= PORTA pin configured as an output
Note 1: Unimplemented, read as ‘1’.
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PIC16(L)F1508/9
REGISTER 11-4: LATA: PORTA DATA LATCH REGISTER
U-0
—
U-0
—
R/W-x/u
LATA5
R/W-x/u
LATA4
U-0
—
R/W-x/u
LATA2
R/W-x/u
LATA1
R/W-x/u
LATA0
bit 7
bit 0
Legend:
R = Readable bit
u = Bit is unchanged
‘1’ = Bit is set
W = Writable bit
U = Unimplemented bit, read as ‘0’
-n/n = Value at POR and BOR/Value at all other Resets
x = Bit is unknown
‘0’ = Bit is cleared
bit 7-6
bit 5-4
bit 3
Unimplemented: Read as ‘0’
LATA<5:4>: RA<5:4> Output Latch Value bits(1)
Unimplemented: Read as ‘0’
bit 2-0
LATA<2:0>: RA<2:0> Output Latch Value bits(1)
Note 1: Writes to PORTA are actually written to corresponding LATA register. Reads from PORTA register is return
of actual I/O pin values.
REGISTER 11-5: ANSELA: PORTA ANALOG SELECT REGISTER
U-0
—
U-0
—
U-0
—
R/W-1/1
ANSA4
U-0
—
R/W-1/1
ANSA2
R/W-1/1
ANSA1
R/W-1/1
ANSA0
bit 7
bit 0
Legend:
R = Readable bit
W = Writable bit
U = Unimplemented bit, read as ‘0’
-n/n = Value at POR and BOR/Value at all other Resets
u = Bit is unchanged
‘1’ = Bit is set
x = Bit is unknown
‘0’ = Bit is cleared
bit 7-5
bit 4
Unimplemented: Read as ‘0’
ANSA4: Analog Select between Analog or Digital Function on pins RA4, respectively
1= Analog input. Pin is assigned as analog input(1). Digital input buffer disabled.
0= Digital I/O. Pin is assigned to port or digital special function.
bit 3
Unimplemented: Read as ‘0’
bit 2-0
ANSA<2:0>: Analog Select between Analog or Digital Function on pins RA<2:0>, respectively
1= Analog input. Pin is assigned as analog input(1). Digital input buffer disabled.
0= Digital I/O. Pin is assigned to port or digital special function.
Note 1: When setting a pin to an analog input, the corresponding TRIS bit must be set to Input mode in order to
allow external control of the voltage on the pin.
2011-2013 Microchip Technology Inc.
DS40001609B-page 113
PIC16(L)F1508/9
REGISTER 11-6: WPUA: WEAK PULL-UP PORTA REGISTER
U-0
—
U-0
—
R/W-1/1
WPUA5
R/W-1/1
WPUA4
R/W-1/1
WPUA3
R/W-1/1
WPUA2
R/W-1/1
WPUA1
R/W-1/1
WPUA0
bit 7
bit 0
Legend:
R = Readable bit
u = Bit is unchanged
‘1’ = Bit is set
W = Writable bit
U = Unimplemented bit, read as ‘0’
-n/n = Value at POR and BOR/Value at all other Resets
x = Bit is unknown
‘0’ = Bit is cleared
bit 7-6
bit 5-0
Unimplemented: Read as ‘0’
WPUA<5:0>: Weak Pull-up Register bits(3)
1= Pull-up enabled
0= Pull-up disabled
Note 1: Global WPUEN bit of the OPTION_REG register must be cleared for individual pull-ups to be enabled.
2: The weak pull-up device is automatically disabled if the pin is configured as an output.
3: For the WPUA3 bit, when MCLRE = 1, weak pull-up is internally enabled, but not reported here.
TABLE 11-3: SUMMARY OF REGISTERS ASSOCIATED WITH PORTA
Register
on Page
Name
Bit 7
Bit 6
Bit 5
Bit 4
Bit 3
Bit 2
Bit 1
Bit 0
ANSELA
—
—
—
—
—
—
ANSA4
SSSEL
LATA4
—
T1GSEL
—
ANSA2
—
ANSA1
ANSA0
113
110
113
161
112
112
114
APFCON
LATA
CLC1SEL NCO1SEL
—
—
LATA5
TMR0CS
RA5
LATA2
LATA1
PS<2:0>
RA1
LATA0
OPTION_REG
PORTA
WPUEN
—
INTEDG
—
TMR0SE
RA4
PSA
RA3
RA2
RA0
(1)
TRISA
—
—
TRISA5
WPUA5
TRISA4
WPUA4
—
TRISA2
WPUA2
TRISA1
WPUA1
TRISA0
WPUA0
WPUA
—
—
WPUA3
Legend:
x= unknown, u= unchanged, – = unimplemented locations read as ‘0’. Shaded cells are not used by PORTA.
Note 1: Unimplemented, read as ‘1’.
TABLE 11-4: SUMMARY OF CONFIGURATION WORD WITH PORTA
Register
on Page
Name
Bits
Bit -/7
Bit -/6
Bit 13/5
Bit 12/4
Bit 11/3
Bit 10/2
Bit 9/1
Bit 8/0
FCMEN
PWRTE
IESO
13:8
7:0
—
—
CLKOUTEN
BOREN<1:0>
FOSC<2:0>
—
CONFIG1
42
CP
MCLRE
WDTE<1:0>
Legend:
— = unimplemented location, read as ‘0’. Shaded cells are not used by PORTA.
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11.5.4
PORTB FUNCTIONS AND OUTPUT
PRIORITIES
11.5 PORTB Registers
11.5.1 DATA REGISTER
Each PORTB pin is multiplexed with other functions. The
pins, their combined functions and their output priorities
are shown in Table 11-5.
PORTB is a 4-bit wide, bidirectional port. The
corresponding data direction register is TRISB
(Register 11-8). Setting a TRISB bit (= 1) will make the
corresponding PORTB pin an input (i.e., disable the
output driver). Clearing a TRISB bit (= 0) will make the
corresponding PORTB pin an output (i.e., enables
output driver and puts the contents of the output latch
on the selected pin). Example 11-1 shows how to
initialize an I/O port.
When multiple outputs are enabled, the actual pin
control goes to the peripheral with the highest priority.
Analog input functions, such as ADC and comparator
inputs, are not shown in the priority lists. These inputs
are active when the I/O pin is set for Analog mode using
the ANSELx registers. Digital output functions may
control the pin when it is in Analog mode with the
priority shown below in Table 11-5.
Reading the PORTB register (Register 11-7) reads the
status of the pins, whereas writing to it will write to the
PORT latch. All write operations are read-modify-write
operations. Therefore, a write to a port implies that the
port pins are read, this value is modified and then
written to the PORT data latch (LATB).
TABLE 11-5: PORTB OUTPUT PRIORITY
Pin Name
Function Priority(1)
RB4
SDA
RB4
11.5.2
DIRECTION CONTROL
The TRISB register (Register 11-8) controls the
PORTB pin output drivers, even when they are being
used as analog inputs. The user should ensure the bits
in the TRISB register are maintained set when using
them as analog inputs. I/O pins configured as analog
input always read ‘0’.
RB5
RB6
RB5
SCL
SCK
RB6
RB7
CLC3
TX
RB7
11.5.3
ANALOG CONTROL
Note 1: Priority listed from highest to lowest.
2: Default pin (see APFCON register).
3: Alternate pin (see APFCON register).
The ANSELB register (Register 11-10) is used to
configure the Input mode of an I/O pin to analog.
Setting the appropriate ANSELB bit high will cause all
digital reads on the pin to be read as ‘0’ and allow
analog functions on the pin to operate correctly.
The state of the ANSELB bits has no effect on digital
output functions. A pin with TRIS clear and ANSEL set
will still operate as a digital output, but the Input mode
will be analog. This can cause unexpected behavior
when executing read-modify-write instructions on the
affected port.
Note:
The ANSELB bits default to the Analog
mode after Reset. To use any pins as
digital general purpose or peripheral
inputs, the corresponding ANSEL bits
must be initialized to ‘0’ by user software.
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11.6 Register Definitions: PORTB
REGISTER 11-7: PORTB: PORTB REGISTER
R/W-x/x
RB7
R/W-x/x
RB6
R/W-x/x
RB5
R/W-x/x
RB4
U-0
—
U-0
—
U-0
—
U-0
—
bit 7
bit 0
Legend:
R = Readable bit
W = Writable bit
U = Unimplemented bit, read as ‘0’
-n/n = Value at POR and BOR/Value at all other Resets
u = Bit is unchanged
‘1’ = Bit is set
x = Bit is unknown
‘0’ = Bit is cleared
bit 7-4
RB<7:4>: PORTB I/O Value bits(1)
1= Port pin is > VIH
0= Port pin is < VIL
bit 3-0
Unimplemented: Read as ‘0’
Note 1: Writes to PORTB are actually written to corresponding LATB register. Reads from PORTB register is
return of actual I/O pin values.
REGISTER 11-8: TRISB: PORTB TRI-STATE REGISTER
R/W-1/1
TRISB7
R/W-1/1
TRISB6
R/W-1/1
TRISB5
R/W-1/1
TRISB4
U-0
—
U-0
—
U-0
—
U-0
—
bit 7
bit 0
Legend:
R = Readable bit
W = Writable bit
U = Unimplemented bit, read as ‘0’
-n/n = Value at POR and BOR/Value at all other Resets
u = Bit is unchanged
‘1’ = Bit is set
x = Bit is unknown
‘0’ = Bit is cleared
bit 7-4
bit 3-0
RB<7:4>: PORTB Tri-State Control bits
1= PORTB pin configured as an input (tri-stated)
0= PORTB pin configured as an output
Unimplemented: Read as ‘0’
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PIC16(L)F1508/9
REGISTER 11-9: LATB: PORTB DATA LATCH REGISTER
R/W-x/u
LATB7
R/W-x/u
LATB6
R/W-x/u
LATB5
R/W-x/u
LATB4
U-0
—
U-0
—
U-0
—
U-0
—
bit 7
bit 0
Legend:
R = Readable bit
W = Writable bit
U = Unimplemented bit, read as ‘0’
-n/n = Value at POR and BOR/Value at all other Resets
u = Bit is unchanged
‘1’ = Bit is set
x = Bit is unknown
‘0’ = Bit is cleared
bit 7-4
bit 3-0
LATB<7:4>: RB<7:4> Output Latch Value bits(1)
Unimplemented: Read as ‘0’
Note 1: Writes to PORTB are actually written to corresponding LATB register. Reads from PORTB register is
return of actual I/O pin values.
REGISTER 11-10: ANSELB: PORTB ANALOG SELECT REGISTER
U-0
—
U-0
—
R/W-1/1
ANSB5
R/W-1/1
ANSB4
U-0
—
U-0
—
U-0
—
U-0
—
bit 7
bit 0
Legend:
R = Readable bit
W = Writable bit
U = Unimplemented bit, read as ‘0’
-n/n = Value at POR and BOR/Value at all other Resets
u = Bit is unchanged
‘1’ = Bit is set
x = Bit is unknown
‘0’ = Bit is cleared
bit 7-6
bit 5-4
Unimplemented: Read as ‘0’
ANSB<5:4>: Analog Select between Analog or Digital Function on pins RB<5:4>, respectively
1= Analog input. Pin is assigned as analog input(1). Digital input buffer disabled.
0= Digital I/O. Pin is assigned to port or digital special function.
bit 3-0
Unimplemented: Read as ‘0’
Note 1: When setting a pin to an analog input, the corresponding TRIS bit must be set to Input mode in order to
allow external control of the voltage on the pin.
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PIC16(L)F1508/9
REGISTER 11-11: WPUB: WEAK PULL-UP PORTB REGISTER
R/W-1/1
WPUB7
R/W-1/1
WPUB6
R/W-1/1
WPUB5
R/W-1/1
WPUB4
U-0
—
U-0
—
U-0
—
U-0
—
bit 7
bit 0
Legend:
R = Readable bit
W = Writable bit
U = Unimplemented bit, read as ‘0’
-n/n = Value at POR and BOR/Value at all other Resets
u = Bit is unchanged
‘1’ = Bit is set
x = Bit is unknown
‘0’ = Bit is cleared
bit 7-4
WPUB<7:4>: Weak Pull-up Register bits
1= Pull-up enabled
0= Pull-up disabled
bit 3-0
Unimplemented: Read as ‘0’
Note 1: Global WPUEN bit of the OPTION_REG register must be cleared for individual pull-ups to be enabled.
2: The weak pull-up device is automatically disabled if the pin is configured as an output.
TABLE 11-6: SUMMARY OF REGISTERS ASSOCIATED WITH PORTB
Register
on Page
Name
Bit 7
Bit 6
Bit 5
Bit 4
Bit 3
Bit 2
Bit 1
Bit 0
ANSELB
—
—
ANSB5
—
ANSB4
SSSEL
LATB4
TMR0SE
RB4
—
T1GSEL
—
—
—
—
—
—
117
110
117
161
116
116
118
APFCON
LATB
—
—
CLC1SEL NCO1SEL
LATB7
WPUEN
RB7
LATB6
INTEDG
RB6
LATB5
TMR0CS
RB5
—
PS<2:0>
—
—
OPTION_REG
PORTB
TRISB
PSA
—
—
—
—
—
—
—
TRISB7
WPUB7
TRISB6
WPUB6
TRISB5
WPUB5
TRISB4
WPUB4
—
—
WPUB
—
—
Legend:
x= unknown, u= unchanged, – = unimplemented locations read as ‘0’. Shaded cells are not used by PORTB.
Note 1: Unimplemented, read as ‘1’.
TABLE 11-7: SUMMARY OF CONFIGURATION WORD WITH PORTB
Register
on Page
Name
Bits
Bit -/7
Bit -/6
Bit 13/5
Bit 12/4
Bit 11/3
Bit 10/2
Bit 9/1
Bit 8/0
13:8
7:0
—
—
FCMEN
PWRTE
IESO
CLKOUTEN
BOREN<1:0>
FOSC<2:0>
—
CONFIG1
42
CP
MCLRE
WDTE<1:0>
Legend:
— = unimplemented location, read as ‘0’. Shaded cells are not used by PORTB.
DS40001609B-page 118
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PIC16(L)F1508/9
11.7.4
PORTC FUNCTIONS AND OUTPUT
PRIORITIES
11.7 PORTC Registers
11.7.1 DATA REGISTER
Each PORTC pin is multiplexed with other functions. The
pins, their combined functions and their output priorities
are shown in Table 11-8.
PORTC is a 8-bit wide, bidirectional port. The
corresponding data direction register is TRISC
(Register 11-13). Setting a TRISC bit (= 1) will make
the corresponding PORTC pin an input (i.e., disable
the output driver). Clearing a TRISC bit (= 0) will make
the corresponding PORTC pin an output (i.e., enable
the output driver and put the contents of the output
latch on the selected pin). Example 11-1 shows how to
initialize an I/O port.
When multiple outputs are enabled, the actual pin
control goes to the peripheral with the highest priority.
Analog input and some digital input functions are not
included in the output priority list. These input functions
can remain active when the pin is configured as an
output. Certain digital input functions override other
port functions and are included in the output priority list.
Reading the PORTC register (Register 11-12) reads the
status of the pins, whereas writing to it will write to the
PORT latch. All write operations are read-modify-write
operations. Therefore, a write to a port implies that the
port pins are read, this value is modified and then written
to the PORT data latch (LATC).
TABLE 11-8: PORTC OUTPUT PRIORITY
Pin Name
Function Priority(1)
RC0
CLC2
RC0
11.7.2
DIRECTION CONTROL
RC1
NCO1(2)
PWM4
RC1
The TRISC register (Register 11-13) controls the
PORTC pin output drivers, even when they are being
used as analog inputs. The user should ensure the bits in
the TRISC register are maintained set when using them
as analog inputs. I/O pins configured as analog input
always read ‘0’.
RC2
RC3
RC2
PWM2
RC3
RC4
CWG1B
CLC4
11.7.3
ANALOG CONTROL
C2OUT
RC4
The ANSELC register (Register 11-15) is used to
configure the Input mode of an I/O pin to analog.
Setting the appropriate ANSELC bit high will cause all
digital reads on the pin to be read as ‘0’ and allow
analog functions on the pin to operate correctly.
RC5
CWG1A
CLC1(3)
PWM1
RC5
NCO1(3)
RC6
The state of the ANSELC bits has no effect on digital out-
put functions. A pin with TRIS clear and ANSELC set will
still operate as a digital output, but the Input mode will be
analog. This can cause unexpected behavior when exe-
cuting read-modify-write instructions on the affected
port.
RC6
RC7
SDO
RC7
Note 1: Priority listed from highest to lowest.
2: Default pin (see APFCON register).
3: Alternate pin (see APFCON register).
Note:
The ANSELC bits default to the Analog
mode after Reset. To use any pins as
digital general purpose or peripheral
inputs, the corresponding ANSEL bits
must be initialized to ‘0’ by user software.
2011-2013 Microchip Technology Inc.
DS40001609B-page 119
PIC16(L)F1508/9
11.8 Register Definitions: PORTC
REGISTER 11-12: PORTC: PORTC REGISTER
R/W-x/u
RC7
R/W-x/u
RC6
R/W-x/u
RC5
R/W-x/u
RC4
R/W-x/u
RC3
R/W-x/u
RC2
R/W-x/u
RC1
R/W-x/u
RC0
bit 7
bit 0
Legend:
R = Readable bit
W = Writable bit
U = Unimplemented bit, read as ‘0’
-n/n = Value at POR and BOR/Value at all other Resets
u = Bit is unchanged
‘1’ = Bit is set
x = Bit is unknown
‘0’ = Bit is cleared
bit 7-0
RC<7:0>: PORTC General Purpose I/O Pin bits
1= Port pin is > VIH
0= Port pin is < VIL
REGISTER 11-13: TRISC: PORTC TRI-STATE REGISTER
R/W-1/1
TRISC7
R/W-1/1
TRISC6
R/W-1/1
TRISC5
R/W-1/1
TRISC4
R/W-1/1
TRISC3
R/W-1/1
TRISC2
R/W-1/1
TRISC1
R/W-1/1
TRISC0
bit 7
bit 0
Legend:
R = Readable bit
W = Writable bit
U = Unimplemented bit, read as ‘0’
-n/n = Value at POR and BOR/Value at all other Resets
u = Bit is unchanged
‘1’ = Bit is set
x = Bit is unknown
‘0’ = Bit is cleared
bit 7-0
TRISC<7:0>: PORTC Tri-State Control bits
1= PORTC pin configured as an input (tri-stated)
0= PORTC pin configured as an output
REGISTER 11-14: LATC: PORTC DATA LATCH REGISTER
R/W-x/u
LATC7
R/W-x/u
LATC6
R/W-x/u
LATC5
R/W-x/u
LATC4
R/W-x/u
LATC3
R/W-x/u
LATC2
R/W-x/u
LATC1
R/W-x/u
LATC0
bit 7
bit 0
Legend:
R = Readable bit
W = Writable bit
U = Unimplemented bit, read as ‘0’
-n/n = Value at POR and BOR/Value at all other Resets
u = Bit is unchanged
‘1’ = Bit is set
x = Bit is unknown
‘0’ = Bit is cleared
bit 7-0
LATC<7:0>: PORTC Output Latch Value bits(1)
Note 1: Writes to PORTC are actually written to corresponding LATC register. Reads from PORTC register is
return of actual I/O pin values.
DS40001609B-page 120
2011-2013 Microchip Technology Inc.
PIC16(L)F1508/9
REGISTER 11-15: ANSELC: PORTC ANALOG SELECT REGISTER
R/W-1/1
ANSC7
R/W-1/1
ANSC6
U-0
—
U-0
—
R/W-1/1
ANSC3
R/W-1/1
ANSC2
R/W-1/1
ANSC1
R/W-1/1
ANSC0
bit 7
bit 0
Legend:
R = Readable bit
W = Writable bit
x = Bit is unknown
‘0’ = Bit is cleared
U = Unimplemented bit, read as ‘0’
-n/n = Value at POR and BOR/Value at all other Resets
u = Bit is unchanged
‘1’ = Bit is set
bit 7-6
ANSC<7:6>: Analog Select between Analog or Digital Function on pins RC<7:6>, respectively
1= Analog input. Pin is assigned as analog input(1). Digital input buffer disabled.
0= Digital I/O. Pin is assigned to port or digital special function.
bit 5-4
bit 3-0
Unimplemented: Read as ‘0’
ANSC<3:0>: Analog Select between Analog or Digital Function on pins RC<3:0>, respectively
1= Analog input. Pin is assigned as analog input(1). Digital input buffer disabled.
0= Digital I/O. Pin is assigned to port or digital special function.
Note 1: When setting a pin to an analog input, the corresponding TRIS bit must be set to Input mode in order to
allow external control of the voltage on the pin.
TABLE 11-9: SUMMARY OF REGISTERS ASSOCIATED WITH PORTC
Register
on Page
Name
Bit 7
Bit 6
Bit 5
Bit 4
Bit 3
Bit 2
Bit 1
Bit 0
ANSELC
LATC
ANSC7
LATC7
RC7
ANSC6
LATC6
RC6
—
—
ANSC3
LATC3
RC3
ANSC2
LATC2
RC2
ANSC1
LATC1
RC1
ANSC0
LATC0
RC0
121
120
120
120
LATC5
RC5
LATC4
RC4
PORTC
TRISC
TRISC7
TRISC6
TRISC5
TRISC4
TRISC3
TRISC2
TRISC1
TRISC0
Legend:
x = unknown, u = unchanged, - = unimplemented locations read as ‘0’. Shaded cells are not used by PORTC.
2011-2013 Microchip Technology Inc.
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PIC16(L)F1508/9
NOTES:
DS40001609B-page 122
2011-2013 Microchip Technology Inc.
PIC16(L)F1508/9
12.3 Interrupt Flags
12.0 INTERRUPT-ON-CHANGE
The IOCAFx and IOCBFx bits located in the IOCAF and
IOCBF registers, respectively, are status flags that
correspond to the interrupt-on-change pins of the
associated port. If an expected edge is detected on an
appropriately enabled pin, then the status flag for that pin
will be set, and an interrupt will be generated if the IOCIE
bit is set. The IOCIF bit of the INTCON register reflects
the status of all IOCAFx and IOCBFx bits.
The PORTA and PORTB pins can be configured to
operate as Interrupt-On-Change (IOC) pins. An interrupt
can be generated by detecting a signal that has either a
rising edge or a falling edge. Any individual port pin, or
combination of port pins, can be configured to generate
an interrupt. The interrupt-on-change module has the
following features:
• Interrupt-on-Change enable (Master Switch)
• Individual pin configuration
12.4 Clearing Interrupt Flags
• Rising and falling edge detection
• Individual pin interrupt flags
The individual status flags, (IOCAFx and IOCBFx bits),
can be cleared by resetting them to zero. If another edge
is detected during this clearing operation, the associated
status flag will be set at the end of the sequence,
regardless of the value actually being written.
Figure 12-1 is a block diagram of the IOC module.
12.1 Enabling the Module
To allow individual port pins to generate an interrupt, the
IOCIE bit of the INTCON register must be set. If the
IOCIE bit is disabled, the edge detection on the pin will
still occur, but an interrupt will not be generated.
In order to ensure that no detected edge is lost while
clearing flags, only AND operations masking out known
changed bits should be performed. The following
sequence is an example of what should be performed.
EXAMPLE 12-1:
CLEARING INTERRUPT
FLAGS
(PORTA EXAMPLE)
12.2 Individual Pin Configuration
For each port pin, a rising edge detector and a falling
edge detector are present. To enable a pin to detect a
rising edge, the associated bit of the IOCxP register is
set. To enable a pin to detect a falling edge, the
associated bit of the IOCxN register is set.
MOVLW 0xff
XORWF IOCAF, W
ANDWF IOCAF, F
A pin can be configured to detect rising and falling
edges simultaneously by setting both associated bits of
the IOCxP and IOCxN registers, respectively.
12.5 Operation in Sleep
The interrupt-on-change interrupt sequence will wake
the device from Sleep mode, if the IOCIE bit is set.
If an edge is detected while in Sleep mode, the IOCxF
register will be updated prior to the first instruction
executed out of Sleep.
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PIC16(L)F1508/9
FIGURE 12-1:
INTERRUPT-ON-CHANGE BLOCK DIAGRAM (PORTA EXAMPLE)
Rev. 10-000037A_A0
D
Q
IOCANx
R
Q4Q1
edge
detect
RAx
to data bus
IOCAFx
S
data bus =
0 or 1
D
Q
D
R
Q
IOCAPx
write IOCAFx
R
IOCIE
Q2
IOC interrupt
to CPU core
from all other
IOCnFx individual
pin detectors
FOSC
Q1
Q1
Q1
Q2
Q2
Q2
Q3
Q3
Q3
Q4
Q4
Q4
Q4Q1
Q4Q1
Q4Q1
Q4Q1
DS40001609B-page 124
2011-2013 Microchip Technology Inc.
PIC16(L)F1508/9
12.6 Register Definitions: Interrupt-on-Change Control
REGISTER 12-1: IOCAP: INTERRUPT-ON-CHANGE PORTA POSITIVE EDGE REGISTER
U-0
—
U-0
—
R/W-0/0
IOCAP5
R/W-0/0
IOCAP4
R/W-0/0
IOCAP3
R/W-0/0
IOCAP2
R/W-0/0
IOCAP1
R/W-0/0
IOCAP0
bit 7
bit 0
Legend:
R = Readable bit
u = Bit is unchanged
‘1’ = Bit is set
W = Writable bit
x = Bit is unknown
‘0’ = Bit is cleared
U = Unimplemented bit, read as ‘0’
-n/n = Value at POR and BOR/Value at all other Resets
bit 7-6
bit 5-0
Unimplemented: Read as ‘0’
IOCAP<5:0>: Interrupt-on-Change PORTA Positive Edge Enable bits
1= Interrupt-on-Change enabled on the pin for a positive going edge. IOCAFx bit and IOCIF flag will be set
upon detecting an edge.
0= Interrupt-on-Change disabled for the associated pin.
REGISTER 12-2: IOCAN: INTERRUPT-ON-CHANGE PORTA NEGATIVE EDGE REGISTER
U-0
—
U-0
—
R/W-0/0
IOCAN5
R/W-0/0
IOCAN4
R/W-0/0
IOCAN3
R/W-0/0
IOCAN2
R/W-0/0
IOCAN1
R/W-0/0
IOCAN0
bit 7
bit 0
Legend:
R = Readable bit
u = Bit is unchanged
‘1’ = Bit is set
W = Writable bit
x = Bit is unknown
‘0’ = Bit is cleared
U = Unimplemented bit, read as ‘0’
-n/n = Value at POR and BOR/Value at all other Resets
bit 7-6
bit 5-0
Unimplemented: Read as ‘0’
IOCAN<5:0>: Interrupt-on-Change PORTA Negative Edge Enable bits
1= Interrupt-on-Change enabled on the pin for a negative going edge. IOCAFx bit and IOCIF flag will be set
upon detecting an edge.
0= Interrupt-on-Change disabled for the associated pin.
REGISTER 12-3: IOCAF: INTERRUPT-ON-CHANGE PORTA FLAG REGISTER
U-0
—
U-0
—
R/W/HS-0/0
IOCAF5
R/W/HS-0/0
IOCAF4
R/W/HS-0/0
IOCAF3
R/W/HS-0/0
IOCAF2
R/W/HS-0/0
IOCAF1
R/W/HS-0/0
IOCAF0
bit 7
bit 0
Legend:
R = Readable bit
u = Bit is unchanged
‘1’ = Bit is set
W = Writable bit
U = Unimplemented bit, read as ‘0’
x = Bit is unknown
‘0’ = Bit is cleared
-n/n = Value at POR and BOR/Value at all other Resets
HS - Bit is set in hardware
bit 7-6
bit 5-0
Unimplemented: Read as ‘0’
IOCAF<5:0>: Interrupt-on-Change PORTA Flag bits
1= An enabled change was detected on the associated pin.
Set when IOCAPx = 1and a rising edge was detected on RAx, or when IOCANx = 1and a falling edge was
detected on RAx.
0= No change was detected, or the user cleared the detected change.
2011-2013 Microchip Technology Inc.
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PIC16(L)F1508/9
REGISTER 12-4: IOCBP: INTERRUPT-ON-CHANGE PORTB POSITIVE EDGE REGISTER
R/W-0/0
IOCBP7
R/W-0/0
IOCBP6
R/W-0/0
IOCBP5
R/W-0/0
IOCBP4
U-0
—
U-0
—
U-0
—
U-0
—
bit 7
bit 0
Legend:
R = Readable bit
u = Bit is unchanged
‘1’ = Bit is set
W = Writable bit
x = Bit is unknown
‘0’ = Bit is cleared
U = Unimplemented bit, read as ‘0’
-n/n = Value at POR and BOR/Value at all other Resets
bit 7-4
IOCBP<7:4>: Interrupt-on-Change PORTB Positive Edge Enable bits
1= Interrupt-on-Change enabled on the pin for a positive going edge. IOCBFx bit and IOCIF flag will be set
upon detecting an edge.
0= Interrupt-on-Change disabled for the associated pin.
bit 3-0
Unimplemented: Read as ‘0’
REGISTER 12-5: IOCBN: INTERRUPT-ON-CHANGE PORTB NEGATIVE EDGE REGISTER
R/W-0/0
IOCBN7
R/W-0/0
IOCBN6
R/W-0/0
IOCBN5
R/W-0/0
IOCBN4
U-0
—
U-0
—
U-0
—
U-0
—
bit 7
bit 0
Legend:
R = Readable bit
u = Bit is unchanged
‘1’ = Bit is set
W = Writable bit
x = Bit is unknown
‘0’ = Bit is cleared
U = Unimplemented bit, read as ‘0’
-n/n = Value at POR and BOR/Value at all other Resets
bit 7-4
bit 3-0
IOCBN<7:4>: Interrupt-on-Change PORTB Negative Edge Enable bits
1= Interrupt-on-Change enabled on the pin for a negative going edge. IOCBFx bit and IOCIF flag will be set
upon detecting an edge.
0= Interrupt-on-Change disabled for the associated pin.
Unimplemented: Read as ‘0’
REGISTER 12-6: IOCBF: INTERRUPT-ON-CHANGE PORTB FLAG REGISTER
R/W/HS-0/0
IOCBF7
R/W/HS-0/0
IOCBF6
R/W/HS-0/0
IOCBF5
R/W/HS-0/0
IOCBF4
U-0
—
U-0
—
U-0
—
U-0
—
bit 7
bit 0
Legend:
R = Readable bit
W = Writable bit
U = Unimplemented bit, read as ‘0’
u = Bit is unchanged
‘1’ = Bit is set
x = Bit is unknown
‘0’ = Bit is cleared
-n/n = Value at POR and BOR/Value at all other Resets
HS - Bit is set in hardware
bit 7-4
bit 3-0
IOCBF<7:4>: Interrupt-on-Change PORTB Flag bits
1= An enabled change was detected on the associated pin.
Set when IOCBPx = 1and a rising edge was detected on RBx, or when IOCBNx = 1and a falling edge was
detected on RBx.
0= No change was detected, or the user cleared the detected change.
Unimplemented: Read as ‘0’
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PIC16(L)F1508/9
TABLE 12-1: SUMMARY OF REGISTERS ASSOCIATED WITH INTERRUPT-ON-CHANGE
Register
on Page
Name
Bit 7
Bit 6
Bit 5
Bit 4
Bit 3
Bit 2
Bit 1
Bit 0
ANSELA
—
GIE
—
PEIE
—
—
ANSA4
INTE
—
IOCIE
IOCAF3
IOCAN3
IOCAP3
—
ANSA2
TMR0IF
IOCAF2
IOCAN2
IOCAP2
—
ANSA1
INTF
IOCAF1
IOCAN1
IOCAP1
—
ANSA0
IOCIF
IOCAF0
IOCAN0
IOCAP0
—
113
76
INTCON
IOCAF
IOCAN
IOCAP
IOCBF
IOCBN
IOCBP
TRISA
TRISB
Legend:
TMR0IE
IOCAF5
IOCAN5
IOCAP5
IOCBF5
IOCBN5
IOCBP5
TRISA5
TRISB5
—
IOCAF4
IOCAN4
IOCAP4
IOCBF4
IOCBN4
IOCBP4
TRISA4
TRISB4
125
125
125
126
126
126
112
116
—
—
—
—
IOCBF7
IOCBN7
IOCBP7
—
IOCBF6
IOCBN6
IOCBP6
—
—
—
—
—
—
—(1)
—
—
—
TRISA2
—
TRISA1
—
TRISA0
—
TRISB7
TRISB6
—
— = unimplemented location, read as ‘0’. Shaded cells are not used by interrupt-on-change.
Note 1: Unimplemented, read as ‘1’.
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PIC16(L)F1508/9
NOTES:
DS40001609B-page 128
2011-2013 Microchip Technology Inc.
PIC16(L)F1508/9
The ADFVR<1:0> bits of the FVRCON register are
used to enable and configure the gain amplifier settings
for the reference supplied to the ADC module. Refer-
ence Section 15.0 “Analog-to-Digital Converter
(ADC) Module” for additional information.
13.0 FIXED VOLTAGE REFERENCE
(FVR)
The Fixed Voltage Reference (FVR) is a stable voltage
reference, independent of VDD, with a nominal output
level (VFVR) of 1.024V. The output of the FVR can be
configured to supply a reference voltage to the
following:
The CDAFVR<1:0> bits of the FVRCON register are
used to enable and configure the gain amplifier settings
for the reference supplied to the comparator modules.
Reference Section 17.0 “Comparator Module” for
additional information.
• ADC input channel
• Comparator positive input
• Comparator negative input
13.2 FVR Stabilization Period
The FVR can be enabled by setting the FVREN bit of
the FVRCON register.
When the Fixed Voltage Reference module is enabled, it
requires time for the reference and amplifier circuits to
stabilize. Once the circuits stabilize and are ready for use,
the FVRRDY bit of the FVRCON register will be set. See
the FVR Stabilization Period characterization graph,
Figure 30-65.
13.1 Independent Gain Amplifier
The output of the FVR supplied to the peripherals,
(listed above), is routed through a programmable gain
amplifier. Each amplifier can be programmed for a gain
of 1x, 2x or 4x, to produce the three possible voltage
levels.
FIGURE 13-1:
VOLTAGE REFERENCE BLOCK DIAGRAM
ADFVR<1:0>
2
X1
X2
X4
VADFVR
FVR_buffer1
(To ADC Module)
CDAFVR<1:0>
2
X1
X2
X4
VCDAFVR
FVR_buffer2
(To Comparators)
VFVR
+
_
FVREN
FVRRDY
Any peripheral requiring the
Fixed Reference
(See Table 13-1)
TABLE 13-1: PERIPHERALS REQUIRING THE FIXED VOLTAGE REFERENCE (FVR)
Peripheral
Conditions
Description
HFINTOSC
FOSC<2:0> = 010and
IRCF<3:0> = 000x
INTOSC is active and device is not in Sleep.
BOREN<1:0> = 11
BOR always enabled.
BOR
LDO
BOREN<1:0> = 10and BORFS = 1
BOREN<1:0> = 01and BORFS = 1
BOR disabled in Sleep mode, BOR Fast Start enabled.
BOR under software control, BOR Fast Start enabled.
All PIC16F1508/9 devices, when
VREGPM = 1and not in Sleep
The device runs off of the Low-Power Regulator when in
Sleep mode.
2011-2013 Microchip Technology Inc.
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PIC16(L)F1508/9
13.3 Register Definitions: FVR Control
REGISTER 13-1: FVRCON: FIXED VOLTAGE REFERENCE CONTROL REGISTER
R/W-0/0
FVREN
R-q/q
FVRRDY(1)
R/W-0/0
TSEN(3)
R/W-0/0
TSRNG(3)
R/W-0/0
R/W-0/0
R/W-0/0
R/W-0/0
CDAFVR<1:0>
ADFVR<1:0>
bit 7
bit 0
Legend:
R = Readable bit
W = Writable bit
U = Unimplemented bit, read as ‘0’
u = Bit is unchanged
‘1’ = Bit is set
x = Bit is unknown
‘0’ = Bit is cleared
-n/n = Value at POR and BOR/Value at all other Resets
q = Value depends on condition
bit 7
bit 6
bit 5
bit 4
bit 3-2
FVREN: Fixed Voltage Reference Enable bit
1= Fixed Voltage Reference is enabled
0= Fixed Voltage Reference is disabled
FVRRDY: Fixed Voltage Reference Ready Flag bit(1)
1= Fixed Voltage Reference output is ready for use
0= Fixed Voltage Reference output is not ready or not enabled
TSEN: Temperature Indicator Enable bit(3)
1= Temperature Indicator is enabled
0= Temperature Indicator is disabled
TSRNG: Temperature Indicator Range Selection bit(3)
1= VOUT = VDD - 4VT (High Range)
0= VOUT = VDD - 2VT (Low Range)
CDAFVR<1:0>: Comparator FVR Buffer Gain Selection bits
11= Comparator FVR Buffer Gain is 4x, with output VCDAFVR = 4x VFVR
10= Comparator FVR Buffer Gain is 2x, with output VCDAFVR = 2x VFVR
01= Comparator FVR Buffer Gain is 1x, with output VCDAFVR = 1x VFVR
00= Comparator FVR Buffer is off
(2)
(2)
bit 1-0
ADFVR<1:0>: ADC FVR Buffer Gain Selection bit
11= ADC FVR Buffer Gain is 4x, with output VADFVR = 4x VFVR
10= ADC FVR Buffer Gain is 2x, with output VADFVR = 2x VFVR
(2)
(2)
01= ADC FVR Buffer Gain is 1x, with output VADFVR = 1x VFVR
00= ADC FVR Buffer is off
Note 1: FVRRDY is always ‘1’ for the PIC16F1508/9 devices.
2: Fixed Voltage Reference output cannot exceed VDD.
3: See Section 14.0 “Temperature Indicator Module” for additional information.
TABLE 13-2: SUMMARYOF REGISTERS ASSOCIATED WITH THE FIXED VOLTAGE REFERENCE
Register
on page
Name
Bit 7
Bit 6
Bit 5
Bit 4
Bit 3
Bit 2
Bit 1
Bit 0
FVRCON
FVREN
FVRRDY
TSEN
TSRNG
CDAFVR>1:0>
ADFVR<1:0>
130
Legend:
Shaded cells are unused by the Fixed Voltage Reference module.
DS40001609B-page 130
2011-2013 Microchip Technology Inc.
PIC16(L)F1508/9
FIGURE 14-1:
TEMPERATURE CIRCUIT
DIAGRAM
14.0 TEMPERATURE INDICATOR
MODULE
This family of devices is equipped with a temperature
circuit designed to measure the operating temperature
of the silicon die. The circuit’s range of operating
temperature falls between -40°C and +85°C. The
output is a voltage that is proportional to the device
temperature. The output of the temperature indicator is
internally connected to the device ADC.
VDD
TSEN
TSRNG
The circuit may be used as a temperature threshold
detector or a more accurate temperature indicator,
depending on the level of calibration performed. A one-
point calibration allows the circuit to indicate a
temperature closely surrounding that point. A two-point
calibration allows the circuit to sense the entire range
of temperature more accurately. Reference Application
Note AN1333, “Use and Calibration of the Internal
Temperature Indicator” (DS01333) for more details
regarding the calibration process.
VOUT
To ADC
Temp. Indicator
14.1 Circuit Operation
14.2 Minimum Operating VDD
Figure 14-1 shows a simplified block diagram of the
temperature circuit. The proportional voltage output is
achieved by measuring the forward voltage drop across
multiple silicon junctions.
When the temperature circuit is operated in low range,
the device may be operated at any operating voltage
that is within specifications.
When the temperature circuit is operated in high range,
the device operating voltage, VDD, must be high
enough to ensure that the temperature circuit is cor-
rectly biased.
Equation 14-1 describes the output characteristics of
the temperature indicator.
EQUATION 14-1: VOUT RANGES
Table 14-1 shows the recommended minimum VDD vs.
range setting.
High Range: VOUT = VDD - 4VT
Low Range: VOUT = VDD - 2VT
TABLE 14-1: RECOMMENDED VDD VS.
RANGE
Min. VDD, TSRNG = 1
Min. VDD, TSRNG = 0
The temperature sense circuit is integrated with the
Fixed Voltage Reference (FVR) module. See
Section 13.0 “Fixed Voltage Reference (FVR)” for
more information.
3.6V
1.8V
14.3 Temperature Output
The output of the circuit is measured using the internal
Analog-to-Digital Converter. A channel is reserved for
the temperature circuit output. Refer to Section 15.0
“Analog-to-Digital Converter (ADC) Module” for
detailed information.
The circuit is enabled by setting the TSEN bit of the
FVRCON register. When disabled, the circuit draws no
current.
The circuit operates in either high or low range. The high
range, selected by setting the TSRNG bit of the
FVRCON register, provides a wider output voltage. This
provides more resolution over the temperature range,
but may be less consistent from part to part. This range
requires a higher bias voltage to operate and thus, a
higher VDD is needed.
14.4 ADC Acquisition Time
To ensure accurate temperature measurements, the
user must wait at least 200 s after the ADC input
multiplexer is connected to the temperature indicator
output before the conversion is performed. In addition,
the user must wait 200 s between sequential
conversions of the temperature indicator output.
The low range is selected by clearing the TSRNG bit of
the FVRCON register. The low range generates a lower
voltage drop and thus, a lower bias voltage is needed to
operate the circuit. The low range is provided for low
voltage operation.
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PIC16(L)F1508/9
TABLE 14-2: SUMMARY OF REGISTERS ASSOCIATED WITH THE TEMPERATURE INDICATOR
Register
on page
Name
Bit 7
Bit 6
Bit 5
Bit 4
Bit 3
Bit 2
Bit 1
Bit 0
FVRCON
FVREN
FVRRDY
TSEN
TSRNG
CDAFVR<1:0>
ADFVR<1:0>
118
Legend:
Shaded cells are unused by the temperature indicator module.
DS40001609B-page 132
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PIC16(L)F1508/9
The ADC voltage reference is software selectable to be
either internally generated or externally supplied.
15.0 ANALOG-TO-DIGITAL
CONVERTER (ADC) MODULE
The ADC can generate an interrupt upon completion of
a conversion. This interrupt can be used to wake-up the
device from Sleep.
The Analog-to-Digital Converter (ADC) allows
conversion of an analog input signal to a 10-bit binary
representation of that signal. This device uses analog
inputs, which are multiplexed into a single sample and
hold circuit. The output of the sample and hold is
connected to the input of the converter. The converter
generates a 10-bit binary result via successive
approximation and stores the conversion result into the
ADC result registers (ADRESH:ADRESL register pair).
Figure 15-1 shows the block diagram of the ADC.
FIGURE 15-1:
ADC BLOCK DIAGRAM
Rev. 10-000033A_A0
VDD
VDD
ADPREF
Positive
Reference
Select
VREF+ pin
ADCS<2:0>
VSS
AN0
ANa
Vref- Vref+
External
Channel
Inputs
.
.
.
Fosc
Divider
FOSC/n
FOSC
FRC
ADC
Clock
Select
ADC_clk
sampled
input
FRC
ANz
Temp Indicator
DACx_output
FVR_buffer1
Internal
Channel
Inputs
ADC CLOCK SOURCE
ADC
Sample Circuit
CHS<4:0>
ADFM
set bit ADIF
10
complete
10-bit Result
16
Write to bit
GO/DONE
GO/DONE
Q1
start
Q4
ADRESH
ADRESL
Q2
Enable
Trigger Select
TRIGSEL<3:0>
ADON
. . .
VSS
Trigger Sources
AUTO CONVERSION
TRIGGER
2011-2013 Microchip Technology Inc.
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PIC16(L)F1508/9
15.1.4
CONVERSION CLOCK
15.1 ADC Configuration
The source of the conversion clock is software select-
able via the ADCS bits of the ADCON1 register. There
are seven possible clock options:
When configuring and using the ADC the following
functions must be considered:
• Port configuration
• FOSC/2
• Channel selection
• FOSC/4
• ADC voltage reference selection
• ADC conversion clock source
• Interrupt control
• FOSC/8
• FOSC/16
• FOSC/32
• Result formatting
• FOSC/64
15.1.1
PORT CONFIGURATION
• FRC (internal RC oscillator)
The ADC can be used to convert both analog and
digital signals. When converting analog signals, the I/O
pin should be configured for analog by setting the
associated TRIS and ANSEL bits. Refer to
Section 11.0 “I/O Ports” for more information.
The time to complete one bit conversion is defined as
TAD. One full 10-bit conversion requires 11.5 TAD peri-
ods as shown in Figure 15-2.
For correct conversion, the appropriate TAD specifica-
tion must be met. Refer to the ADC conversion require-
ments in Section 29.0 “Electrical Specifications” for
more information. Table 15-1 gives examples of appro-
priate ADC clock selections.
Note:
Analog voltages on any pin that is defined
as a digital input may cause the input
buffer to conduct excess current.
Note:
Unless using the FRC, any changes in the
system clock frequency will change the
ADC clock frequency, which may
adversely affect the ADC result.
15.1.2
CHANNEL SELECTION
There are 15 channel selections available:
• AN<11:0> pins
• Temperature Indicator
• DAC1_output
• FVR_buffer1
The CHS bits of the ADCON0 register determine which
channel is connected to the sample and hold circuit.
When changing channels, a delay (TACQ) is required
before starting the next conversion. Refer to
Section 15.2.6 “ADC Conversion Procedure” for
more information.
15.1.3
ADC VOLTAGE REFERENCE
The ADC module uses a positive and a negative
voltage reference. The positive reference is labeled
ref+ and the negative reference is labeled ref-.
The positive voltage reference (ref+) is selected by the
ADPREF bits in the ADCON1 register. The positive
voltage reference source can be:
• VREF+ pin
• VDD
The negative voltage reference (ref-) source is:
• VSS
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PIC16(L)F1508/9
TABLE 15-1: ADC CLOCK PERIOD (TAD) VS. DEVICE OPERATING FREQUENCIES
ADC Clock Period (TAD)
Device Frequency (FOSC)
ADC
ADCS<2:0
Clock
>
20 MHz
16 MHz
8 MHz
4 MHz
1 MHz
Source
Fosc/2
Fosc/4
Fosc/8
Fosc/16
Fosc/32
Fosc/64
FRC
000
100
001
101
010
110
x11
100 ns
200 ns
400 ns
800 ns
1.6 s
125 ns
250 ns
500 ns
1.0 s
250 ns
500 ns
1.0 s
500 ns
1.0 s
2.0 s
4.0 s
2.0 s
8.0 s
2.0 s
4.0 s
16.0 s
32.0 s
64.0 s
1.0-6.0 s
2.0 s
4.0 s
8.0 s
3.2 s
4.0 s
8.0 s
16.0 s
1.0-6.0 s
1.0-6.0 s
1.0-6.0 s
1.0-6.0 s
Legend: Shaded cells are outside of recommended range.
Note:
The TAD period when using the FRC clock source can fall within a specified range, (see TAD parameter).
The TAD period when using the FOSC-based clock source can be configured for a more precise TAD period.
However, the FRC clock source must be used when conversions are to be performed with the device in
Sleep mode.
FIGURE 15-2:
ANALOG-TO-DIGITAL CONVERSION TAD CYCLES
Rev. 10-000035A_A0
TAD1
TAD2
b9
TAD3
b8
TAD4
b7
TAD5
b6
TAD6
b5
TAD7
b4
TAD8
b3
TAD9
b2
TAD10
b1
TAD11
b0
THCD
Conversion Starts
TACQ
On the following cycle:
Holding capacitor disconnected
from analog input (THCD).
ADRESH:ADRESL is loaded,
GO bit is cleared,
Set GO bit
ADIF bit is set,
holding capacitor is reconnected to analog input.
Enable ADC (ADON bit)
and
Select channel (ACS bits)
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15.1.5
INTERRUPTS
15.1.6
RESULT FORMATTING
The ADC module allows for the ability to generate an
interrupt upon completion of an Analog-to-Digital
conversion. The ADC Interrupt Flag is the ADIF bit in
the PIR1 register. The ADC Interrupt Enable is the
ADIE bit in the PIE1 register. The ADIF bit must be
cleared in software.
The 10-bit ADC conversion result can be supplied in
two formats, left justified or right justified. The ADFM bit
of the ADCON1 register controls the output format.
Figure 15-3 shows the two output formats.
Note 1: The ADIF bit is set at the completion of
every conversion, regardless of whether
or not the ADC interrupt is enabled.
2: The ADC operates during Sleep only
when the FRC oscillator is selected.
This interrupt can be generated while the device is
operating or while in Sleep. If the device is in Sleep, the
interrupt will wake-up the device. Upon waking from
Sleep, the next instruction following the SLEEPinstruc-
tion is always executed. If the user is attempting to
wake-up from Sleep and resume in-line code execu-
tion, the GIE and PEIE bits of the INTCON register
must be disabled. If the GIE and PEIE bits of the
INTCON register are enabled, execution will switch to
the Interrupt Service Routine.
FIGURE 15-3:
10-BIT ADC CONVERSION RESULT FORMAT
ADRESH
ADRESL
LSB
(ADFM = 0)
MSB
bit 7
bit 0
bit 0
bit 7
bit 7
bit 0
10-bit ADC Result
Unimplemented: Read as ‘0’
(ADFM = 1)
MSB
LSB
bit 0
bit 7
Unimplemented: Read as ‘0’
10-bit ADC Result
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15.2.4
ADC OPERATION DURING SLEEP
15.2 ADC Operation
The ADC module can operate during Sleep. This
requires the ADC clock source to be set to the FRC
option. Performing the ADC conversion during Sleep
can reduce system noise. If the ADC interrupt is
enabled, the device will wake-up from Sleep when the
conversion completes. If the ADC interrupt is disabled,
the ADC module is turned off after the conversion com-
pletes, although the ADON bit remains set.
15.2.1
STARTING A CONVERSION
To enable the ADC module, the ADON bit of the
ADCON0 register must be set to a ‘1’. Setting the GO/
DONE bit of the ADCON0 register to a ‘1’ will start the
Analog-to-Digital conversion.
Note:
The GO/DONE bit should not be set in the
same instruction that turns on the ADC.
Refer to Section 15.2.6 “ADC Conver-
sion Procedure”.
When the ADC clock source is something other than
FRC, a SLEEPinstruction causes the present conver-
sion to be aborted and the ADC module is turned off,
although the ADON bit remains set.
15.2.2
COMPLETION OF A CONVERSION
When the conversion is complete, the ADC module will:
15.2.5
AUTO-CONVERSION TRIGGER
• Clear the GO/DONE bit
The auto-conversion trigger allows periodic ADC mea-
surements without software intervention. When a rising
edge of the selected source occurs, the GO/DONE bit
is set by hardware.
• Set the ADIF Interrupt Flag bit
• Update the ADRESH and ADRESL registers with
new conversion result
The auto-conversion trigger source is selected with the
TRIGSEL<3:0> bits of the ADCON2 register.
15.2.3
TERMINATING A CONVERSION
If a conversion must be terminated before completion,
the GO/DONE bit can be cleared in software. The
ADRESH and ADRESL registers will be updated with
the partially complete Analog-to-Digital conversion
sample. Incomplete bits will match the last bit
converted.
Using the auto-conversion trigger does not assure
proper ADC timing. It is the user’s responsibility to
ensure that the ADC timing requirements are met.
See Table 15-2 for auto-conversion sources.
TABLE 15-2: AUTO-CONVERSION
SOURCES
Note:
A device Reset forces all registers to their
Reset state. Thus, the ADC module is
turned off and any pending conversion is
terminated.
Source Peripheral
Timer0
Signal Name
T0_overflow
Timer1
T1_overflow
T2_match
C1OUT_sync
C2OUT_sync
LC1_out
Timer2
Comparator C1
Comparator C2
CLC1
CLC2
LC2_out
CLC3
LC3_out
CLC4
LC4_out
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15.2.6
ADC CONVERSION PROCEDURE
EXAMPLE 15-1:
ADC CONVERSION
This is an example procedure for using the ADC to
perform an Analog-to-Digital conversion:
;This code block configures the ADC
;for polling, Vdd and Vss references, FRC
;oscillator and AN0 input.
;
;Conversion start & polling for completion
; are included.
;
1. Configure Port:
• Disable pin output driver (Refer to the TRIS
register)
• Configure pin as analog (Refer to the ANSEL
register)
BANKSEL
MOVLW
ADCON1
;
B’11110000’ ;Right justify, FRC
;oscillator
2. Configure the ADC module:
• Select ADC conversion clock
• Configure voltage reference
• Select ADC input channel
• Turn on ADC module
MOVWF
BANKSEL
BSF
BANKSEL
BSF
BANKSEL
MOVLW
MOVWF
CALL
BSF
BTFSC
GOTO
BANKSEL
MOVF
MOVWF
BANKSEL
MOVF
ADCON1
TRISA
TRISA,0
ANSEL
ANSEL,0
ADCON0
;Vdd and Vss Vref+
;
;Set RA0 to input
;
;Set RA0 to analog
;
3. Configure ADC interrupt (optional):
• Clear ADC interrupt flag
B’00000001’ ;Select channel AN0
ADCON0 ;Turn ADC On
SampleTime ;Acquisiton delay
ADCON0,ADGO ;Start conversion
ADCON0,ADGO ;Is conversion done?
• Enable ADC interrupt
• Enable peripheral interrupt
• Enable global interrupt(1)
4. Wait the required acquisition time(2)
$-1
ADRESH
;No, test again
;
;Read upper 2 bits
;store in GPR space
;
.
5. Start conversion by setting the GO/DONE bit.
ADRESH,W
RESULTHI
ADRESL
ADRESL,W
RESULTLO
6. Wait for ADC conversion to complete by one of
the following:
;Read lower 8 bits
;Store in GPR space
• Polling the GO/DONE bit
MOVWF
• Waiting for the ADC interrupt (interrupts
enabled)
7. Read ADC Result.
8. Clear the ADC interrupt flag (required if interrupt
is enabled).
Note 1: The global interrupt can be disabled if the
user is attempting to wake-up from Sleep
and resume in-line code execution.
2: Refer to Section 15.4 “ADC Acquisi-
tion Requirements”.
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15.3 Register Definitions: ADC Control
REGISTER 15-1: ADCON0: ADC CONTROL REGISTER 0
U-0
—
R/W-0/0
R/W-0/0
R/W-0/0
R/W-0/0
R/W-0/0
R/W-0/0
R/W-0/0
ADON
CHS<4:0>
GO/DONE
bit 7
bit 0
Legend:
R = Readable bit
W = Writable bit
U = Unimplemented bit, read as ‘0’
-n/n = Value at POR and BOR/Value at all other Resets
u = Bit is unchanged
‘1’ = Bit is set
x = Bit is unknown
‘0’ = Bit is cleared
bit 7
Unimplemented: Read as ‘0’
bit 6-2
CHS<4:0>: Analog Channel Select bits
00000= AN0
00001= AN1
00010= AN2
00011= AN3
00100= AN4
00101= AN5
00110= AN6
00111= AN7
01000= AN8
01001= AN9
01010= AN10
01011= AN11
01100= Reserved. No channel connected.
•
•
•
11100= Reserved. No channel connected.
11101= Temperature Indicator(1)
11110= DAC (Digital-to-Analog Converter)(2)
11111=FVR (Fixed Voltage Reference) Buffer 1 Output(3)
GO/DONE: ADC Conversion Status bit
bit 1
bit 0
1= ADC conversion cycle in progress. Setting this bit starts an ADC conversion cycle.
This bit is automatically cleared by hardware when the ADC conversion has completed.
0= ADC conversion completed/not in progress
ADON: ADC Enable bit
1= ADC is enabled
0= ADC is disabled and consumes no operating current
Note 1: See Section 14.0 “Temperature Indicator Module” for more information.
2: See Section 16.0 “5-Bit Digital-to-Analog Converter (DAC) Module” for more information.
3: See Section 13.0 “Fixed Voltage Reference (FVR)” for more information.
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REGISTER 15-2: ADCON1: ADC CONTROL REGISTER 1
R/W-0/0
ADFM
R/W-0/0
R/W-0/0
R/W-0/0
U-0
—
U-0
—
R/W-0/0
R/W-0/0
ADCS<2:0>
ADPREF<1:0>
bit 7
bit 0
Legend:
R = Readable bit
W = Writable bit
U = Unimplemented bit, read as ‘0’
-n/n = Value at POR and BOR/Value at all other Resets
u = Bit is unchanged
‘1’ = Bit is set
x = Bit is unknown
‘0’ = Bit is cleared
bit 7
ADFM: ADC Result Format Select bit
1= Right justified. Six Most Significant bits of ADRESH are set to ‘0’ when the conversion result is
loaded.
0= Left justified. Six Least Significant bits of ADRESL are set to ‘0’ when the conversion result is
loaded.
bit 6-4
ADCS<2:0>: ADC Conversion Clock Select bits
000= FOSC/2
001= FOSC/8
010= FOSC/32
011= FRC (clock supplied from an internal RC oscillator)
100= FOSC/4
101= FOSC/16
110= FOSC/64
111= FRC (clock supplied from an internal RC oscillator)
bit 3-2
bit 1-0
Unimplemented: Read as ‘0’
ADPREF<1:0>: ADC Positive Voltage Reference Configuration bits
00= VREF+ is connected to VDD
01= Reserved
10= VREF+ is connected to external VREF+ pin(1)
11= Reserved
Note 1: When selecting the VREF+ pin as the source of the positive reference, be aware that a minimum voltage
specification exists. See Section 29.0 “Electrical Specifications” for details.
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REGISTER 15-3: ADCON2: ADC CONTROL REGISTER 2
R/W-0/0
R/W-0/0
TRIGSEL<3:0>(1)
R/W-0/0
R/W-0/0
U-0
—
U-0
—
U-0
—
U-0
—
bit 7
bit 0
Legend:
R = Readable bit
u = Bit is unchanged
‘1’ = Bit is set
W = Writable bit
U = Unimplemented bit, read as ‘0’
-n/n = Value at POR and BOR/Value at all other Resets
x = Bit is unknown
‘0’ = Bit is cleared
bit 7-4
TRIGSEL<3:0>: Auto-Conversion Trigger Selection bits(1)
0000= No auto-conversion trigger selected
0001= Reserved
0010= Reserved
0011= Timer0 – T0_overflow(2)
0100= Timer1 – T1_overflow(2)
0101= Timer2 – T2_match
0110= Comparator C1 – C1OUT_sync
0111= Comparator C2 – C2OUT_sync
1000= CLC1 – LC1_out
1001= CLC2 – LC2_out
1010= CLC3 – LC3_out
1011= CLC4 – LC4_out
1100= Reserved
1101= Reserved
1110= Reserved
1111= Reserved
bit 3-0
Unimplemented: Read as ‘0’
Note 1: This is a rising edge sensitive input for all sources.
2: Signal also sets its corresponding interrupt flag.
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REGISTER 15-4: ADRESH: ADC RESULT REGISTER HIGH (ADRESH) ADFM = 0
R/W-x/u
R/W-x/u
R/W-x/u
R/W-x/u
R/W-x/u
R/W-x/u
R/W-x/u
R/W-x/u
bit 0
ADRES<9:2>
bit 7
Legend:
R = Readable bit
W = Writable bit
U = Unimplemented bit, read as ‘0’
-n/n = Value at POR and BOR/Value at all other Resets
u = Bit is unchanged
‘1’ = Bit is set
x = Bit is unknown
‘0’ = Bit is cleared
bit 7-0
ADRES<9:2>: ADC Result Register bits
Upper eight bits of 10-bit conversion result
REGISTER 15-5: ADRESL: ADC RESULT REGISTER LOW (ADRESL) ADFM = 0
R/W-x/u
R/W-x/u
R/W-x/u
—
R/W-x/u
—
R/W-x/u
—
R/W-x/u
—
R/W-x/u
—
R/W-x/u
—
ADRES<1:0>
bit 7
bit 0
Legend:
R = Readable bit
W = Writable bit
U = Unimplemented bit, read as ‘0’
u = Bit is unchanged
‘1’ = Bit is set
x = Bit is unknown
‘0’ = Bit is cleared
-n/n = Value at POR and BOR/Value at all other Resets
bit 7-6
bit 5-0
ADRES<1:0>: ADC Result Register bits
Lower two bits of 10-bit conversion result
Reserved: Do not use.
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PIC16(L)F1508/9
REGISTER 15-6: ADRESH: ADC RESULT REGISTER HIGH (ADRESH) ADFM = 1
R/W-x/u
—
R/W-x/u
—
R/W-x/u
—
R/W-x/u
—
R/W-x/u
—
R/W-x/u
—
R/W-x/u
R/W-x/u
ADRES<9:8>
bit 7
bit 0
Legend:
R = Readable bit
W = Writable bit
U = Unimplemented bit, read as ‘0’
-n/n = Value at POR and BOR/Value at all other Resets
u = Bit is unchanged
‘1’ = Bit is set
x = Bit is unknown
‘0’ = Bit is cleared
bit 7-2
bit 1-0
Reserved: Do not use.
ADRES<9:8>: ADC Result Register bits
Upper two bits of 10-bit conversion result
REGISTER 15-7: ADRESL: ADC RESULT REGISTER LOW (ADRESL) ADFM = 1
R/W-x/u
R/W-x/u
R/W-x/u
R/W-x/u
R/W-x/u
R/W-x/u
R/W-x/u
R/W-x/u
bit 0
ADRES<7:0>
bit 7
Legend:
R = Readable bit
W = Writable bit
U = Unimplemented bit, read as ‘0’
-n/n = Value at POR and BOR/Value at all other Resets
u = Bit is unchanged
‘1’ = Bit is set
x = Bit is unknown
‘0’ = Bit is cleared
bit 7-0
ADRES<7:0>: ADC Result Register bits
Lower eight bits of 10-bit conversion result
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source impedance is decreased, the acquisition time
may be decreased. After the analog input channel is
selected (or changed), an ADC acquisition must be
done before the conversion can be started. To
calculate the minimum acquisition time, Equation 15-1
may be used. This equation assumes that 1/2 LSb error
is used (1,024 steps for the ADC). The 1/2 LSb error is
the maximum error allowed for the ADC to meet its
specified resolution.
15.4 ADC Acquisition Requirements
For the ADC to meet its specified accuracy, the charge
holding capacitor (CHOLD) must be allowed to fully
charge to the input channel voltage level. The Analog
Input model is shown in Figure 15-4. The source
impedance (RS) and the internal sampling switch (RSS)
impedance directly affect the time required to charge
the capacitor CHOLD. The sampling switch (RSS)
impedance varies over the device voltage (VDD), refer
to Figure 15-4. The maximum recommended
impedance for analog sources is 10 k. As the
EQUATION 15-1: ACQUISITION TIME EXAMPLE
Temperature = 50°C and external impedance of 10k 5.0V VDD
Assumptions:
TACQ = Amplifier Settling Time + Hold Capacitor Charging Time + Temperature Coefficient
= TAMP + TC + TCOFF
= 2µs + TC + Temperature - 25°C0.05µs/°C
The value for TC can be approximated with the following equations:
1
;[1] VCHOLD charged to within 1/2 lsb
VAPPLIED1 – -------------------------- = VCHOLD
2n + 1 – 1
–TC
---------
RC
VAPPLIED 1 – e
= VCHOLD
;[2] VCHOLD charge response to VAPPLIED
;combining [1] and [2]
–Tc
--------
RC
1
= VAPPLIED1 – --------------------------
2n + 1 – 1
VAPPLIED 1 – e
Note: Where n = number of bits of the ADC.
Solving for TC:
TC = –CHOLDRIC + RSS + RS ln(1/2047)
= –12.5pF1k + 7k + 10k ln(0.0004885)
= 1.12µs
Therefore:
TACQ = 2µs + 1.12µs + 50°C- 25°C0.05µs/°C
= 4.37µs
Note 1: The reference voltage (VREF+) has no effect on the equation, since it cancels itself out.
2: The charge holding capacitor (CHOLD) is not discharged after each conversion.
3: The maximum recommended impedance for analog sources is 10 k. This is required to meet the pin
leakage specification.
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PIC16(L)F1508/9
FIGURE 15-4:
ANALOG INPUT MODEL
VDD
Analog
Input
pin
Sampling
Switch
VT 0.6V
SS
RIC 1k
Rss
Rs
(1)
CPIN
5 pF
VA
I LEAKAGE
CHOLD = 10 pF
Ref-
VT 0.6V
6V
5V
VDD 4V
3V
RSS
Legend:
CHOLD
CPIN
= Sample/Hold Capacitance
= Input Capacitance
2V
I LEAKAGE = Leakage current at the pin due to
various junctions
5 6 7 8 9 1011
Sampling Switch
RIC
RSS
SS
VT
= Interconnect Resistance
= Resistance of Sampling Switch
= Sampling Switch
(k)
= Threshold Voltage
Note 1: Refer to Section 29.0 “Electrical Specifications”.
FIGURE 15-5:
ADC TRANSFER FUNCTION
Full-Scale Range
3FFh
3FEh
3FDh
3FCh
3FBh
03h
02h
01h
00h
Analog Input Voltage
1.5 LSB
0.5 LSB
Zero-Scale
Transition
Ref-
Full-Scale
Transition
Ref+
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TABLE 15-3: SUMMARY OF REGISTERS ASSOCIATED WITH ADC
Register
on Page
Name
Bit 7
Bit 6
Bit 5
Bit 4
Bit 3
Bit 2
Bit 1
Bit 0
ADCON0
ADCON1
ADCON2
ADRESH
ADRESL
ANSELA
ANSELB
ANSELC
INTCON
PIE1
—
CHS<4:0>
GO/DONE
ADON
139
140
ADFM
ADCS<2:0>
—
—
—
—
ADPREF<1:0>
TRIGSEL<3:0>
—
—
141
ADC Result Register High
ADC Result Register Low
142, 143
142, 143
113
—
—
—
—
—
ANSA4
ANSB4
—
—
ANSA2
—
ANSA1
—
ANSA0
—
ANSB5
—
—
117
ANSC7
GIE
ANSC6
PEIE
ANSC3
IOCIE
SSP1IE
ANSC2
TMR0IF
—
ANSC1
INTF
ANSC0
IOCIF
TMR1IE
TMR1IF
TRISA0
—
121
TMR0IE
RCIE
INTE
76
TMR1GIE
TMR1GIF
—
ADIE
TXIE
TMR2IE
TMR2IF
TRISA1
—
77
PIR1
ADIF
RCIF
TXIF
SSP1IF
—
80
—(1)
TRISA
—
TRISA5
TRISB5
TRISC5
TSEN
TRISA4
TRISB4
TRISC4
TSRNG
TRISA2
—
112
TRISB
TRISB7
TRISC7
FVREN
TRISB6
TRISC6
FVRRDY
—
116
TRISC
TRISC3
TRISC2
TRISC1
TRISC0
120
FVRCON
Legend:
CDAFVR<1:0>
ADFVR<1:0>
130
x= unknown, u= unchanged, —= unimplemented read as ‘0’, q= value depends on condition. Shaded cells are not
used for ADC module.
Note 1: Unimplemented, read as ‘1’.
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The output of the DAC (DACx_output) can be selected
as a reference voltage to the following:
16.0 5-BIT DIGITAL-TO-ANALOG
CONVERTER (DAC) MODULE
• Comparator positive input
• ADC input channel
• DACxOUT1 pin
The Digital-to-Analog Converter supplies a variable
voltage reference, ratiometric with the input source,
with 32 selectable output levels.
• DACxOUT2 pin
The positive input source (VSOURCE+) of the DAC can
be connected to:
The Digital-to-Analog Converter (DAC) can be enabled
by setting the DACEN bit of the DACxCON0 register.
• External VREF+ pin
• VDD supply voltage
The negative input source (VSOURCE-) of the DAC can
be connected to:
• Vss
FIGURE 16-1:
DIGITAL-TO-ANALOG CONVERTER BLOCK DIAGRAM
Rev. 10-000026A_A0
VDD
0
1
VSOURCE+
VREF+
DACR<4:0>
5
R
R
R
R
DACPSS
DACEN
DACx_output
To Peripherals
32
Steps
R
R
R
DACxOUT1 (1)
DACOE1
DACxOUT2 (1)
DACOE2
VSOURCE-
VSS
Note 1: The unbuffered DACx_output is provided on the DACxOUT pin(s).
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Reading the DACxOUTn pin when it has been
configured for DAC reference voltage output will
always return a ‘0’.
16.1 Output Voltage Selection
The DAC has 32 voltage level ranges. The 32 levels
are set with the DACR<4:0> bits of the DACxCON1
register.
Note:
The unbuffered DAC output (DACxOUTn)
is not intended to drive an external load.
The DAC output voltage can be determined by using
Equation 16-1.
16.4 Operation During Sleep
16.2 Ratiometric Output Level
When the device wakes up from Sleep through an
interrupt or a Watchdog Timer time-out, the contents of
the DACxCON0 register are not affected. To minimize
current consumption in Sleep mode, the voltage
reference should be disabled.
The DAC output value is derived using a resistor ladder
with each end of the ladder tied to a positive and
negative voltage reference input source. If the voltage
of either input source fluctuates, a similar fluctuation will
result in the DAC output value.
16.5 Effects of a Reset
The value of the individual resistors within the ladder
can be found in Table 29-16.
A device Reset affects the following:
• DACx is disabled.
16.3 DAC Voltage Reference Output
• DACX output voltage is removed from the
DACxOUTn pin(s).
The unbuffered DAC voltage can be output to the
DACxOUTn pin(s) by setting the respective DACOEn
bit(s) of the DACxCON0 register. Selecting the DAC
reference voltage for output on either DACxOUTn pin
automatically overrides the digital output buffer, the
weak pull-up and digital input threshold detector
functions of that pin.
• The DACR<4:0> range select bits are cleared.
EQUATION 16-1: DAC OUTPUT VOLTAGE
IF DACEN = 1
DACR4:0
DACx_output = VSOURCE+ – VSOURCE- ----------------------------- + VSOURCE-
25
Note:
See the DACxCON0 register for the available VSOURCE+ and VSOURCE- selections.
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16.6 Register Definitions: DAC Control
REGISTER 16-1: DACxCON0: VOLTAGE REFERENCE CONTROL REGISTER 0
R/W-0/0
DACEN
U-0
—
R/W-0/0
R/W-0/0
U-0
—
R/W-0/0
U-0
—
U-0
—
DACOE1
DACOE2
DACPSS
bit 7
bit 0
Legend:
R = Readable bit
u = Bit is unchanged
‘1’ = Bit is set
W = Writable bit
x = Bit is unknown
‘0’ = Bit is cleared
U = Unimplemented bit, read as ‘0’
-n/n = Value at POR and BOR/Value at all other Resets
bit 7
DACEN: DAC Enable bit
1= DACx is enabled
0= DACx is disabled
bit 6
bit 5
Unimplemented: Read as ‘0’
DACOE1: DAC Voltage Output Enable bit
1= DACx voltage level is output on the DACxOUT1 pin
0= DACx voltage level is disconnected from the DACxOUT1 pin
bit 4
DACOE2: DAC Voltage Output Enable bit
1= DACx voltage level is output on the DACxOUT2 pin
0= DACx voltage level is disconnected from the DACxOUT2 pin
bit 3
bit 2
Unimplemented: Read as ‘0’
DACPSS: DAC Positive Source Select bit
1=
0=
VREF+ pin
VDD
bit 1-0
Unimplemented: Read as ‘0’
REGISTER 16-2: DACxCON1: VOLTAGE REFERENCE CONTROL REGISTER 1
U-0
—
U-0
—
U-0
—
R/W-0/0
R/W-0/0
R/W-0/0
R/W-0/0
R/W-0/0
DACR<4:0>
bit 7
bit 0
Legend:
R = Readable bit
u = Bit is unchanged
‘1’ = Bit is set
W = Writable bit
x = Bit is unknown
‘0’ = Bit is cleared
U = Unimplemented bit, read as ‘0’
-n/n = Value at POR and BOR/Value at all other Resets
bit 7-5
bit 4-0
Unimplemented: Read as ‘0’
DACR<4:0>: DAC Voltage Output Select bits
TABLE 16-1: SUMMARY OF REGISTERS ASSOCIATED WITH THE DAC MODULE
Register
on page
Name
Bit 7
Bit 6
Bit 5
Bit 4
Bit 3
Bit 2
Bit 1
Bit 0
DAC1CON0
DAC1CON1
Legend:
DACEN
—
—
—
DACOE1 DACOE2
—
—
DACPSS
—
—
149
149
DACR<4:0>
— = Unimplemented location, read as ‘0’. Shaded cells are not used with the DAC module.
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NOTES:
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17.1
Comparator Overview
17.0 COMPARATOR MODULE
A single comparator is shown in Figure 17-2 along with
the relationship between the analog input levels and
the digital output. When the analog voltage at VIN+ is
less than the analog voltage at VIN-, the output of the
comparator is a digital low level. When the analog
voltage at VIN+ is greater than the analog voltage at
VIN-, the output of the comparator is a digital high level.
Comparators are used to interface analog circuits to a
digital circuit by comparing two analog voltages and
providing a digital indication of their relative magnitudes.
Comparators are very useful mixed signal building
blocks because they provide analog functionality
independent of program execution. The analog
comparator module includes the following features:
The comparators available for this device are listed in
Table 17-1.
• Independent comparator control
• Programmable input selection
• Comparator output is available internally/externally
• Programmable output polarity
• Interrupt-on-change
TABLE 17-1: AVAILABLE COMPARATORS
Device
C1
C2
• Wake-up from Sleep
PIC16(L)F1508
PIC16(L)F1509
●
●
●
●
• Programmable Speed/Power optimization
• PWM shutdown
• Programmable and fixed voltage reference
FIGURE 17-1:
COMPARATOR MODULE SIMPLIFIED BLOCK DIAGRAM
Rev. 10-000027A_A0
CxINTP
3
CxON(1)
Interrupt
CxNCH<2:0>
Rising
Edge
set bit
CxIF
CxIN0-
CxIN1-
000
001
010
011
100
CxINTN
Interrupt
Falling
Edge
CxIN2-
CxON(1)
CxIN3-
CxVN
FVR_buffer2
CxOUT
MCxOUT
-
D
Q
Cx
CxVP
CxIN+
DAC_out
00
01
10
+
Q1
CxSP CxHYS
CxPOL
CxOUT_async
CxOUT_sync
FVR_buffer2
To Peripherals
To Peripherals
11
CxPCH<1:0>
CxON(1)
2
CxSYNC
Q
CxOE
TRIS bit
0
1
CxOUT
D
(From Timer1 Module) T1CLK
Note 1:
When CxON = 0, all multiplexer inputs are disconnected and the Comparator will produce a ‘0’ at the output.
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• CxIN+ analog pin
• DAC1_output
• FVR_buffer2
• VSS
FIGURE 17-2:
SINGLE COMPARATOR
VIN+
VIN-
+
–
Output
See Section 13.0 “Fixed Voltage Reference (FVR)”
for more information on the Fixed Voltage Reference
module.
See Section 16.0 “5-Bit Digital-to-Analog Converter
(DAC) Module” for more information on the DAC input
signal.
VIN-
VIN+
Any time the comparator is disabled (CxON = 0), all
comparator inputs are disabled.
17.2.3
COMPARATOR NEGATIVE INPUT
SELECTION
Output
The CxNCH<2:0> bits of the CMxCON0 register direct
one of the input sources to the comparator inverting
input.
Note:
The black areas of the output of the
comparator represents the uncertainty
due to input offsets and response time.
Note:
To use CxIN+ and CxINx- pins as analog
input, the appropriate bits must be set in
the ANSEL register and the correspond-
ing TRIS bits must also be set to disable
the output drivers.
17.2 Comparator Control
Each comparator has two control registers: CMxCON0
and CMxCON1.
17.2.4
COMPARATOR OUTPUT
SELECTION
The CMxCON0 registers (see Register 17-1) contain
Control and Status bits for the following:
The output of the comparator can be monitored by
reading either the CxOUT bit of the CMxCON0 register
or the MCxOUT bit of the CMOUT register. In order to
make the output available for an external connection,
the following conditions must be true:
• Enable
• Output selection
• Output polarity
• Speed/Power selection
• Hysteresis enable
• Output synchronization
• CxOE bit of the CMxCON0 register must be set
• Corresponding TRIS bit must be cleared
• CxON bit of the CMxCON0 register must be set
The CMxCON1 registers (see Register 17-2) contain
Control bits for the following:
The
synchronous
comparator
output
signal
(CxOUT_sync) is available to the following peripheral(s):
• Interrupt enable
• Configurable Logic Cell (CLC)
• Analog-to-Digital Converter (ADC)
• Timer1
• Interrupt edge polarity
• Positive input channel selection
• Negative input channel selection
The
asynchronous
comparator
output
signal
17.2.1
COMPARATOR ENABLE
(CxOUT_async) is available to the following peripheral(s):
Setting the CxON bit of the CMxCON0 register enables
the comparator for operation. Clearing the CxON bit
disables the comparator resulting in minimum current
consumption.
•
Complementary Waveform Generator (CWG)
Note 1: The CxOE bit of the CMxCON0 register
overrides the PORT data latch. Setting
the CxON bit of the CMxCON0 register
has no impact on the port override.
17.2.2
COMPARATOR POSITIVE INPUT
SELECTION
2: The internal output of the comparator is
latched with each instruction cycle.
Unless otherwise specified, external
outputs are not latched.
Configuring the CxPCH<1:0> bits of the CMxCON1
register directs an internal voltage reference or an
analog pin to the non-inverting input of the comparator:
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17.2.5
COMPARATOR OUTPUT POLARITY
17.3 Analog Input Connection
Considerations
Inverting the output of the comparator is functionally
equivalent to swapping the comparator inputs. The
polarity of the comparator output can be inverted by
setting the CxPOL bit of the CMxCON0 register.
Clearing the CxPOL bit results in a non-inverted output.
A simplified circuit for an analog input is shown in
Figure 17-3. Since the analog input pins share their
connection with a digital input, they have reverse
biased ESD protection diodes to VDD and VSS. The
analog input, therefore, must be between VSS and VDD.
If the input voltage deviates from this range by more
than 0.6V in either direction, one of the diodes is for-
ward biased and a latch-up may occur.
Table 17-2 shows the output state versus input
conditions, including polarity control.
TABLE 17-2:
COMPARATOR OUTPUT
STATE VS. INPUT CONDITIONS
A maximum source impedance of 10 k is recommended
for the analog sources. Also, any external component
connected to an analog input pin, such as a capacitor or
a Zener diode, should have very little leakage current to
minimize inaccuracies introduced.
Input Condition
CxPOL
CxOUT
CxVN > CxVP
CxVN < CxVP
CxVN > CxVP
CxVN < CxVP
0
0
1
1
0
1
1
0
Note 1: When reading a PORT register, all pins
configured as analog inputs will read as a
‘0’. Pins configured as digital inputs will
convert as an analog input, according to
the input specification.
17.2.6
COMPARATOR SPEED/POWER
SELECTION
The trade-off between speed or power can be opti-
mized during program execution with the CxSP control
bit. The default state for this bit is ‘1’ which selects the
Normal-Speed mode. Device power consumption can
be optimized at the cost of slower comparator propaga-
tion delay by clearing the CxSP bit to ‘0’.
2: Analog levels on any pin defined as a
digital input, may cause the input buffer to
consume more current than is specified.
FIGURE 17-3:
ANALOG INPUT MODEL
VDD
Analog
Input
pin
VT 0.6V
RIC
Rs < 10K
To Comparator
(1)
ILEAKAGE
CPIN
5 pF
VA
VT 0.6V
Vss
Legend: CPIN
= Input Capacitance
ILEAKAGE = Leakage Current at the pin due to various junctions
RIC
RS
VA
= Interconnect Resistance
= Source Impedance
= Analog Voltage
VT
= Threshold Voltage
Note 1: See Section 29.0 “Electrical Specifications”.
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The associated interrupt flag bit, CxIF bit of the PIR2
register, must be cleared in software. If another edge is
detected while this flag is being cleared, the flag will still
be set at the end of the sequence.
17.4 Comparator Hysteresis
A selectable amount of separation voltage can be
added to the input pins of each comparator to provide a
hysteresis function to the overall operation. Hysteresis
is enabled by setting the CxHYS bit of the CMxCON0
register.
Note:
Although a comparator is disabled, an
interrupt can be generated by changing
the output polarity with the CxPOL bit of
the CMxCON0 register, or by switching
the comparator on or off with the CxON bit
of the CMxCON0 register.
See Section 29.0 “Electrical Specifications” for
more information.
17.5 Timer1 Gate Operation
The output resulting from a comparator operation can
be used as a source for gate control of Timer1. See
Section 19.6 “Timer1 Gate” for more information.
This feature is useful for timing the duration or interval
of an analog event.
17.7 Comparator Response Time
The comparator output is indeterminate for a period of
time after the change of an input source or the selection
of a new reference voltage. This period is referred to as
the response time. The response time of the comparator
differs from the settling time of the voltage reference.
Therefore, both of these times must be considered when
determining the total response time to a comparator
input change. See the Comparator and Voltage Refer-
ence Specifications in Section 29.0 “Electrical Specifi-
cations” for more details.
It is recommended that the comparator output be syn-
chronized to Timer1. This ensures that Timer1 does not
increment while a change in the comparator is occur-
ring.
17.5.1
COMPARATOR OUTPUT
SYNCHRONIZATION
The output from the Cx comparator can be
synchronized with Timer1 by setting the CxSYNC bit of
the CMxCON0 register.
Once enabled, the comparator output is latched on the
falling edge of the Timer1 source clock. If a prescaler is
used with Timer1, the comparator output is latched after
the prescaling function. To prevent a race condition, the
comparator output is latched on the falling edge of the
Timer1 clock source and Timer1 increments on the
rising edge of its clock source. See the Comparator
Block Diagram (Figure 17-2) and the Timer1 Block
Diagram (Figure 19-1) for more information.
17.6 Comparator Interrupt
An interrupt can be generated upon a change in the
output value of the comparator for each comparator, a
rising edge detector and a falling edge detector are
present.
When either edge detector is triggered and its associ-
ated enable bit is set (CxINTP and/or CxINTN bits of
the CMxCON1 register), the Corresponding Interrupt
Flag bit (CxIF bit of the PIR2 register) will be set.
To enable the interrupt, you must set the following bits:
• CxON, CxPOL and CxSP bits of the CMxCON0
register
• CxIE bit of the PIE2 register
• CxINTP bit of the CMxCON1 register (for a rising
edge detection)
• CxINTN bit of the CMxCON1 register (for a falling
edge detection)
• PEIE and GIE bits of the INTCON register
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17.8 Register Definitions: Comparator Control
REGISTER 17-1: CMxCON0: COMPARATOR Cx CONTROL REGISTER 0
R/W-0/0
CxON
R-0/0
R/W-0/0
CxOE
R/W-0/0
CxPOL
U-0
—
R/W-1/1
CxSP
R/W-0/0
CxHYS
R/W-0/0
CxSYNC
CxOUT
bit 7
bit 0
Legend:
R = Readable bit
W = Writable bit
U = Unimplemented bit, read as ‘0’
-n/n = Value at POR and BOR/Value at all other Resets
u = Bit is unchanged
‘1’ = Bit is set
x = Bit is unknown
‘0’ = Bit is cleared
bit 7
bit 6
CxON: Comparator Enable bit
1= Comparator is enabled
0= Comparator is disabled and consumes no active power
CxOUT: Comparator Output bit
If CxPOL = 1 (inverted polarity):
1= CxVP < CxVN
0= CxVP > CxVN
If CxPOL = 0 (non-inverted polarity):
1= CxVP > CxVN
0= CxVP < CxVN
bit 5
bit 4
CxOE: Comparator Output Enable bit
1= CxOUT is present on the CxOUT pin. Requires that the associated TRIS bit be cleared to actually
drive the pin. Not affected by CxON.
0= CxOUT is internal only
CxPOL: Comparator Output Polarity Select bit
1= Comparator output is inverted
0= Comparator output is not inverted
bit 3
bit 2
Unimplemented: Read as ‘0’
CxSP: Comparator Speed/Power Select bit
1= Comparator mode in normal-power, higher speed
0= Comparator mode in low-power, low-speed
bit 1
bit 0
CxHYS: Comparator Hysteresis Enable bit
1= Comparator hysteresis enabled
0= Comparator hysteresis disabled
CxSYNC: Comparator Output Synchronous Mode bit
1= Comparator output to Timer1 and I/O pin is synchronous to changes on Timer1 clock source.
Output updated on the falling edge of Timer1 clock source.
0= Comparator output to Timer1 and I/O pin is asynchronous
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REGISTER 17-2: CMxCON1: COMPARATOR Cx CONTROL REGISTER 1
R/W-0/0
CxINTP
R/W-0/0
CxINTN
R/W-0/0
R/W-0/0
U-0
—
R/W-0/0
R/W-0/0
R/W-0/0
CxPCH<1:0>
CxNCH<2:0>
bit 7
bit 0
Legend:
R = Readable bit
W = Writable bit
U = Unimplemented bit, read as ‘0’
-n/n = Value at POR and BOR/Value at all other Resets
u = Bit is unchanged
‘1’ = Bit is set
x = Bit is unknown
‘0’ = Bit is cleared
bit 7
CxINTP: Comparator Interrupt on Positive Going Edge Enable bits
1= The CxIF interrupt flag will be set upon a positive going edge of the CxOUT bit
0= No interrupt flag will be set on a positive going edge of the CxOUT bit
bit 6
CxINTN: Comparator Interrupt on Negative Going Edge Enable bits
1= The CxIF interrupt flag will be set upon a negative going edge of the CxOUT bit
0= No interrupt flag will be set on a negative going edge of the CxOUT bit
bit 5-4
CxPCH<1:0>: Comparator Positive Input Channel Select bits
11= CxVP connects to VSS
10= CxVP connects to FVR Voltage Reference
01= CxVP connects to DAC Voltage Reference
00= CxVP connects to CxIN+ pin
bit 3
Unimplemented: Read as ‘0’
bit 2-0
CxNCH<2:0>: Comparator Negative Input Channel Select bits
111= Reserved
110= Reserved
101= Reserved
100= CxVN connects to FVR Voltage reference
011= CxVN connects to CxIN3- pin
010= CxVN connects to CxIN2- pin
001= CxVN connects to CxIN1- pin
000= CxVN connects to CxIN0- pin
REGISTER 17-3: CMOUT: COMPARATOR OUTPUT REGISTER
U-0
—
U-0
—
U-0
—
U-0
—
U-0
—
U-0
—
R-0/0
R-0/0
MC2OUT
MC1OUT
bit 7
bit 0
Legend:
R = Readable bit
W = Writable bit
x = Bit is unknown
‘0’ = Bit is cleared
U = Unimplemented bit, read as ‘0’
u = Bit is unchanged
‘1’ = Bit is set
-n/n = Value at POR and BOR/Value at all other Resets
bit 7-2
bit 1
Unimplemented: Read as ‘0’
MC2OUT: Mirror Copy of C2OUT bit
MC1OUT: Mirror Copy of C1OUT bit
bit 0
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TABLE 17-3: SUMMARY OF REGISTERS ASSOCIATED WITH COMPARATOR MODULE
Register
on Page
Name
Bit 7
Bit 6
Bit 5
Bit 4
Bit 3
Bit 2
Bit 1
Bit 0
ANSELA
ANSELC
CM1CON0
CM2CON0
CM1CON1
CM2CON1
CMOUT
DAC1CON0
DAC1CON1
FVRCON
INTCON
PIE2
—
—
ANSC6
C1OUT
C2OUT
C1INTN
C2INTN
—
—
ANSA4
—
—
ANSC3
—
ANSA2
ANSC2
C1SP
ANSA1
ANSC1
ANSA0
ANSC0
113
121
155
155
156
156
156
149
149
130
76
ANSC7
C1ON
C2ON
C1NTP
C2NTP
—
—
C1OE
C2OE
C1POL
C2POL
C1HYS
C1SYNC
C2SYNC
—
C2SP
C2HYS
C1PCH<1:0>
C2PCH<1:0>
—
C1NCH<2:0>
C2NCH<2:0>
—
—
—
—
—
MC2OUT MC1OUT
DACEN
—
—
DACOE1
—
DACOE2
—
DACPSS
DACR<4:0>
—
—
—
FVREN
GIE
FVRRDY
PEIE
TSEN
TMR0IE
C1IE
TSRNG
INTE
—
CDAFVR<1:0>
ADFVR<1:0>
IOCIE
BCL1IE
BCL1IF
RA3
TMR0IF
NCO1IE
NCO1IF
RA2
INTF
—
IOCIF
—
OSFIE
OSFIF
C2IE
78
C2IF
C1IF
PIR2
—
—
—
81
PORTA
RA5
RA4
RA1
RA0
112
120
113
120
112
120
—
RC7
—
—
RC6
—
PORTC
LATA
RC5
RC4
RC3
RC2
RC1
RC0
LATA5
LATC5
TRISA5
TRISC5
LATA4
LATC4
TRISA4
TRISC4
—
LATA2
LATC2
TRISA2
TRISC2
LATA1
LATC1
TRISA1
TRISC1
LATA0
LATC0
TRISA0
TRISC0
LATC
LATC7
—
LATC6
—
LATC3
(1)
—
TRISA
TRISC
TRISC7
TRISC6
TRISC3
Legend:
— = unimplemented location, read as ‘0’. Shaded cells are unused by the comparator module.
Note 1: Unimplemented, read as ‘1’.
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18.1.2
8-BIT COUNTER MODE
18.0 TIMER0 MODULE
In 8-Bit Counter mode, the Timer0 module will
increment on every rising or falling edge of the T0CKI
pin.
The Timer0 module is an 8-bit timer/counter with the
following features:
• 8-bit timer/counter register (TMR0)
• 3-bit prescaler (independent of Watchdog Timer)
• Programmable internal or external clock source
• Programmable external clock edge selection
• Interrupt on overflow
8-Bit Counter mode using the T0CKI pin is selected by
setting the TMR0CS bit in the OPTION_REG register to
‘1’.
The rising or falling transition of the incrementing edge
for either input source is determined by the TMR0SE bit
in the OPTION_REG register.
• TMR0 can be used to gate Timer1
Figure 18-1 is a block diagram of the Timer0 module.
18.1 Timer0 Operation
The Timer0 module can be used as either an 8-bit timer
or an 8-bit counter.
18.1.1
8-BIT TIMER MODE
The Timer0 module will increment every instruction
cycle, if used without a prescaler. 8-bit Timer mode is
selected by clearing the TMR0CS bit of the
OPTION_REG register.
When TMR0 is written, the increment is inhibited for
two instruction cycles immediately following the write.
Note:
The value written to the TMR0 register
can be adjusted, in order to account for
the two instruction cycle delay when
TMR0 is written.
FIGURE 18-1:
TIMER0 BLOCK DIAGRAM
Rev. 10-000017A_A1
TMR0CS
Fosc/4
PSA
T0CKI(1)
T0_overflow
T0CKI
0
1
TMR0
Sync Circuit
Prescaler
PS<2:0>
0
FOSC/2
Q1
1
write
to
TMR0
R
set bit
TMR0IF
TMR0SE
Note 1: The T0CKI prescale output frequency should not exceed FOSC/8.
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18.1.3
SOFTWARE PROGRAMMABLE
PRESCALER
A software programmable prescaler is available for
exclusive use with Timer0. The prescaler is enabled by
clearing the PSA bit of the OPTION_REG register.
Note:
The Watchdog Timer (WDT) uses its own
independent prescaler.
There are 8 prescaler options for the Timer0 module
ranging from 1:2 to 1:256. The prescale values are
selectable via the PS<2:0> bits of the OPTION_REG
register. In order to have a 1:1 prescaler value for the
Timer0 module, the prescaler must be disabled by set-
ting the PSA bit of the OPTION_REG register.
The prescaler is not readable or writable. All instructions
writing to the TMR0 register will clear the prescaler.
18.1.4
TIMER0 INTERRUPT
Timer0 will generate an interrupt when the TMR0
register overflows from FFh to 00h. The TMR0IF
interrupt flag bit of the INTCON register is set every
time the TMR0 register overflows, regardless of
whether or not the Timer0 interrupt is enabled. The
TMR0IF bit can only be cleared in software. The
Timer0 interrupt enable is the TMR0IE bit of the
INTCON register.
Note:
The Timer0 interrupt cannot wake the
processor from Sleep since the timer is
frozen during Sleep.
18.1.5
8-BIT COUNTER MODE
SYNCHRONIZATION
When in 8-Bit Counter mode, the incrementing edge on
the T0CKI pin must be synchronized to the instruction
clock. Synchronization can be accomplished by
sampling the prescaler output on the Q2 and Q4 cycles
of the instruction clock. The high and low periods of the
external clocking source must meet the timing
requirements as shown in Section 29.0 “Electrical
Specifications”.
18.1.6
OPERATION DURING SLEEP
Timer0 cannot operate while the processor is in Sleep
mode. The contents of the TMR0 register will remain
unchanged while the processor is in Sleep mode.
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18.2 Register Definitions: Option Register
REGISTER 18-1: OPTION_REG: OPTION REGISTER
R/W-1/1
WPUEN
R/W-1/1
INTEDG
R/W-1/1
R/W-1/1
R/W-1/1
PSA
R/W-1/1
R/W-1/1
PS<2:0>
R/W-1/1
bit 0
TMR0CS
TMR0SE
bit 7
Legend:
R = Readable bit
W = Writable bit
U = Unimplemented bit, read as ‘0’
-n/n = Value at POR and BOR/Value at all other Resets
u = Bit is unchanged
‘1’ = Bit is set
x = Bit is unknown
‘0’ = Bit is cleared
bit 7
bit 6
bit 5
bit 4
bit 3
bit 2-0
WPUEN: Weak Pull-Up Enable bit
1= All weak pull-ups are disabled (except MCLR, if it is enabled)
0= Weak pull-ups are enabled by individual WPUx latch values
INTEDG: Interrupt Edge Select bit
1= Interrupt on rising edge of INT pin
0= Interrupt on falling edge of INT pin
TMR0CS: Timer0 Clock Source Select bit
1= Transition on T0CKI pin
0= Internal instruction cycle clock (FOSC/4)
TMR0SE: Timer0 Source Edge Select bit
1= Increment on high-to-low transition on T0CKI pin
0= Increment on low-to-high transition on T0CKI pin
PSA: Prescaler Assignment bit
1= Prescaler is not assigned to the Timer0 module
0= Prescaler is assigned to the Timer0 module
PS<2:0>: Prescaler Rate Select bits
Bit Value
Timer0 Rate
000
001
010
011
100
101
110
111
1 : 2
1 : 4
1 : 8
1 : 16
1 : 32
1 : 64
1 : 128
1 : 256
TABLE 18-1: SUMMARY OF REGISTERS ASSOCIATED WITH TIMER0
Register
on Page
Name
ADCON2
Bit 7
Bit 6
Bit 5
Bit 4
Bit 3
Bit 2
Bit 1
Bit 0
TRIGSEL<3:0>
PEIE TMR0IE
—
—
—
INTF
—
141
76
INTCON
OPTION_REG
TMR0
GIE
INTE
IOCIE
PSA
TMR0IF
IOCIF
WPUEN
INTEDG TMR0CS TMR0SE
PS<2:0>
161
159*
112
Holding Register for the 8-bit Timer0 Count
TRISA5 TRISA4
(1)
TRISA
—
—
—
TRISA2
TRISA1
TRISA0
Legend:
— = Unimplemented location, read as ‘0’. Shaded cells are not used by the Timer0 module.
*
Page provides register information.
Note 1: Unimplemented, read as ‘1’.
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NOTES:
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PIC16(L)F1508/9
• Wake-up on overflow (external clock,
19.0 TIMER1 MODULE WITH GATE
CONTROL
Asynchronous mode only)
• ADC Auto-Conversion Trigger(s)
• Selectable Gate Source Polarity
• Gate Toggle mode
The Timer1 module is a 16-bit timer/counter with the
following features:
• 16-bit timer/counter register pair (TMR1H:TMR1L)
• Programmable internal or external clock source
• 2-bit prescaler
• Gate Single-Pulse mode
• Gate Value Status
• Gate Event Interrupt
• Optionally synchronized comparator out
• Multiple Timer1 gate (count enable) sources
• Interrupt on overflow
Figure 19-1 is a block diagram of the Timer1 module.
FIGURE 19-1:
TIMER1 BLOCK DIAGRAM
Rev. 10-000018A_A0
T1GSS<1:0>
T1GSPM
T1G
00
01
10
11
T0_overflow
C1OUT_sync
C2OUT_sync
1
D
Q
T1GVAL
0
1
Single Pulse
Acq. Control
0
Q1
D
Q
T1GGO/DONE
T1GPOL
CK
R
Q
Interrupt
det
TMR1ON
T1GTM
set bit
TMR1GIF
TMR1GE
set flag bit
TMR1IF
TMR1ON
EN
D
TMR1(2)
TMR1H TMR1L
T1_overflow
Synchronized Clock Input
Q
0
1
T1CLK
T1SYNC
TMR1CS<1:0>
OUT
SOSCI/T1CKI
SOSCO
Secondary
Oscillator
LFINTOSC
Fosc
11
10
1
0
Prescaler
1,2,4,8
Synchronize(3)
01
00
Internal Clock
det
EN
2
Fosc/4
Internal Clock
Fosc/2
Internal
Clock
T1CKPS<1:0>
T1OSCEN
Sleep
Input
(1)
Secondary Clock
To Clock Switching
Module
Note 1: ST Buffer is high speed type when using T1CKI.
2: Timer1 register increments on rising edge.
3: Synchronize does not operate while in Sleep.
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19.1 Timer1 Operation
19.2 Clock Source Selection
The Timer1 module is a 16-bit incrementing counter
which is accessed through the TMR1H:TMR1L register
pair. Writes to TMR1H or TMR1L directly update the
counter.
The TMR1CS<1:0> and T1OSCEN bits of the T1CON
register are used to select the clock source for Timer1.
Table 19-2 displays the clock source selections.
19.2.1
INTERNAL CLOCK SOURCE
When used with an internal clock source, the module is
a timer and increments on every instruction cycle.
When used with an external clock source, the module
can be used as either a timer or counter and incre-
ments on every selected edge of the external source.
When the internal clock source is selected, the
TMR1H:TMR1L register pair will increment on multiples
of FOSC as determined by the Timer1 prescaler.
When the FOSC internal clock source is selected, the
Timer1 register value will increment by four counts every
instruction clock cycle. Due to this condition, a 2 LSB
error in resolution will occur when reading the Timer1
value. To utilize the full resolution of Timer1, an
asynchronous input signal must be used to gate the
Timer1 clock input.
Timer1 is enabled by configuring the TMR1ON and
TMR1GE bits in the T1CON and T1GCON registers,
respectively. Table 19-1 displays the Timer1 enable
selections.
TABLE 19-1: TIMER1 ENABLE
SELECTIONS
The following asynchronous sources may be used:
• Asynchronous event on the T1G pin to Timer1
gate
Timer1
Operation
TMR1ON
TMR1GE
• C1 or C2 comparator input to Timer1 gate
0
0
1
1
0
1
0
1
Off
Off
19.2.2
EXTERNAL CLOCK SOURCE
When the external clock source is selected, the Timer1
module may work as a timer or a counter.
Always On
Count Enabled
When enabled to count, Timer1 is incremented on the
rising edge of the external clock input T1CKI. The
external clock source can be synchronized to the
microcontroller system clock or it can run
asynchronously.
Note:
In Counter mode, a falling edge must be
registered by the counter prior to the first
incrementing rising edge after any one or
more of the following conditions:
• Timer1 enabled after POR
• Write to TMR1H or TMR1L
• Timer1 is disabled
• Timer1 is disabled (TMR1ON = 0)
when T1CKI is high then Timer1 is
enabled (TMR1ON=1) when T1CKI is
low.
TABLE 19-2: CLOCK SOURCE SELECTIONS
TMR1CS<1:0>
T1OSCEN
Clock Source
11
x
1
0
x
x
LFINTOSC
Secondary Oscillator Circuit on SOSCI/SOSCO Pins
External Clocking on T1CKI Pin
System Clock (FOSC)
10
01
00
Instruction Clock (FOSC/4)
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For writes, it is recommended that the user simply stop
the timer and write the desired values. A write
contention may occur by writing to the timer registers,
while the register is incrementing. This may produce an
unpredictable value in the TMR1H:TMR1L register
pair.
19.3 Timer1 Prescaler
Timer1 has four prescaler options allowing 1, 2, 4 or 8
divisions of the clock input. The T1CKPS bits of the
T1CON register control the prescale counter. The
prescale counter is not directly readable or writable;
however, the prescaler counter is cleared upon a write to
TMR1H or TMR1L.
19.6 Timer1 Gate
Timer1 can be configured to count freely or the count
can be enabled and disabled using Timer1 gate
circuitry. This is also referred to as Timer1 Gate Enable.
19.4 Timer1 (Secondary) Oscillator
A dedicated low-power 32.768 kHz oscillator circuit is
built-in between pins S1OSI (input) and S1OSO (ampli-
fier output). This internal circuit is to be used in con-
junction with an external 32.768 kHz crystal. The
oscillator circuit is enabled by setting the T1OSCEN bit
of the T1CON register. The oscillator will continue to
run during Sleep.
Timer1 gate can also be driven by multiple selectable
sources.
19.6.1
TIMER1 GATE ENABLE
The Timer1 Gate Enable mode is enabled by setting
the TMR1GE bit of the T1GCON register. The polarity
of the Timer1 Gate Enable mode is configured using
the T1GPOL bit of the T1GCON register.
Note:
The oscillator requires some time to start-up
and stabilize before use. The SOSCR bit in
the OSCSTAT register monitors the
oscillator and indicates when the oscillator is
ready for use. When T1OSCEN is set, the
SOSCR bit is cleared. After 1024 cycles of
the oscillator are countered, the SOSCR bit
is set, indicating that the oscillator should be
stable and ready for use.
When Timer1 Gate Enable mode is enabled, Timer1
will increment on the rising edge of the Timer1 clock
source. When Timer1 Gate Enable mode is disabled,
no incrementing will occur and Timer1 will hold the
current count. See Figure 19-3 for timing details.
TABLE 19-3: TIMER1 GATE ENABLE
SELECTIONS
19.5 Timer1 Operation in
Asynchronous Counter Mode
T1CLK T1GPOL
T1G
Timer1 Operation
If control bit T1SYNC of the T1CON register is set, the
external clock input is not synchronized. The timer
increments asynchronously to the internal phase
clocks. If the external clock source is selected then the
timer will continue to run during Sleep and can
generate an interrupt on overflow, which will wake-up
the processor. However, special precautions in
software are needed to read/write the timer (see
Section 19.5.1 “Reading and Writing Timer1 in
Asynchronous Counter Mode”).
0
0
1
1
0
1
0
1
Counts
Holds Count
Holds Count
Counts
19.6.2
TIMER1 GATE SOURCE
SELECTION
Timer1 gate source selections are shown in Table 19-4.
Source selection is controlled by the T1GSS<1:0> bits
of the T1GCON register. The polarity for each available
source is also selectable. Polarity selection is controlled
by the T1GPOL bit of the T1GCON register.
Note:
When switching from synchronous to
asynchronous operation, it is possible to
skip an increment. When switching from
asynchronous to synchronous operation,
it is possible to produce an additional
increment.
TABLE 19-4: TIMER1 GATE SOURCES
T1GSS
Timer1 Gate Source
Timer1 Gate pin (T1G)
00
01
19.5.1
READING AND WRITING TIMER1 IN
ASYNCHRONOUS COUNTER
MODE
Overflow of Timer0 (T0_overflow)
(TMR0 increments from FFh to 00h)
(1)
(1)
Reading TMR1H or TMR1L while the timer is running
from an external asynchronous clock will ensure a valid
read (taken care of in hardware). However, the user
should keep in mind that reading the 16-bit timer in two
8-bit values itself, poses certain problems, since the
timer may overflow between the reads.
10
11
Comparator 1 Output (C1OUT_sync)
Comparator 2 Output (C2OUT_sync)
Note 1: Optionally synchronized comparator output.
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19.6.2.1
T1G Pin Gate Operation
19.6.5
TIMER1 GATE VALUE STATUS
The T1G pin is one source for Timer1 gate control. It
can be used to supply an external source to the Timer1
gate circuitry.
When Timer1 Gate Value Status is utilized, it is possi-
ble to read the most current level of the gate control
value. The value is stored in the T1GVAL bit in the
T1GCON register. The T1GVAL bit is valid even when
the Timer1 gate is not enabled (TMR1GE bit is
cleared).
19.6.2.2
Timer0 Overflow Gate Operation
When Timer0 increments from FFh to 00h, a low-to-
high pulse will automatically be generated and inter-
nally supplied to the Timer1 gate circuitry.
19.6.6
TIMER1 GATE EVENT INTERRUPT
When Timer1 Gate Event Interrupt is enabled, it is pos-
sible to generate an interrupt upon the completion of a
gate event. When the falling edge of T1GVAL occurs,
the TMR1GIF flag bit in the PIR1 register will be set. If
the TMR1GIE bit in the PIE1 register is set, then an
interrupt will be recognized.
19.6.3
TIMER1 GATE TOGGLE MODE
When Timer1 Gate Toggle mode is enabled, it is pos-
sible to measure the full-cycle length of a Timer1 gate
signal, as opposed to the duration of a single level
pulse.
The TMR1GIF flag bit operates even when the Timer1
gate is not enabled (TMR1GE bit is cleared).
The Timer1 gate source is routed through a flip-flop
that changes state on every incrementing edge of the
signal. See Figure 19-4 for timing details.
Timer1 Gate Toggle mode is enabled by setting the
T1GTM bit of the T1GCON register. When the T1GTM
bit is cleared, the flip-flop is cleared and held clear. This
is necessary in order to control which edge is
measured.
Note:
Enabling Toggle mode at the same time
as changing the gate polarity may result in
indeterminate operation.
19.6.4
TIMER1 GATE SINGLE-PULSE
MODE
When Timer1 Gate Single-Pulse mode is enabled, it is
possible to capture a single pulse gate event. Timer1
Gate Single-Pulse mode is first enabled by setting the
T1GSPM bit in the T1GCON register. Next, the T1GGO/
DONE bit in the T1GCON register must be set. The
Timer1 will be fully enabled on the next incrementing
edge. On the next trailing edge of the pulse, the T1GGO/
DONE bit will automatically be cleared. No other gate
events will be allowed to increment Timer1 until the
T1GGO/DONE bit is once again set in software. See
Figure 19-5 for timing details.
If the Single Pulse Gate mode is disabled by clearing the
T1GSPM bit in the T1GCON register, the T1GGO/DONE
bit should also be cleared.
Enabling the Toggle mode and the Single-Pulse mode
simultaneously will permit both sections to work
together. This allows the cycle times on the Timer1
gate source to be measured. See Figure 19-6 for timing
details.
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19.8.1
ALTERNATE PIN LOCATIONS
19.7 Timer1 Interrupt
This module incorporates I/O pins that can be moved to
other locations with the use of the alternate pin function
register, APFCON. To determine which pins can be
moved and what their default locations are upon a
Reset, see Section 11.1 “Alternate Pin Function” for
more information.
The Timer1 register pair (TMR1H:TMR1L) increments
to FFFFh and rolls over to 0000h. When Timer1 rolls
over, the Timer1 interrupt flag bit of the PIR1 register is
set. To enable the interrupt on rollover, you must set
these bits:
• TMR1ON bit of the T1CON register
• TMR1IE bit of the PIE1 register
• PEIE bit of the INTCON register
• GIE bit of the INTCON register
The interrupt is cleared by clearing the TMR1IF bit in
the Interrupt Service Routine.
Note:
The TMR1H:TMR1L register pair and the
TMR1IF bit should be cleared before
enabling interrupts.
19.8 Timer1 Operation During Sleep
Timer1 can only operate during Sleep when setup in
Asynchronous Counter mode. In this mode, an external
crystal or clock source can be used to increment the
counter. To set up the timer to wake the device:
• TMR1ON bit of the T1CON register must be set
• TMR1IE bit of the PIE1 register must be set
• PEIE bit of the INTCON register must be set
• T1SYNC bit of the T1CON register must be set
• TMR1CS bits of the T1CON register must be
configured
• T1OSCEN bit of the T1CON register must be
configured
The device will wake-up on an overflow and execute
the next instructions. If the GIE bit of the INTCON
register is set, the device will call the Interrupt Service
Routine.
Timer1 oscillator will continue to operate in Sleep
regardless of the T1SYNC bit setting.
FIGURE 19-2:
TIMER1 INCREMENTING EDGE
T1CKI = 1
when TMR1
Enabled
T1CKI = 0
when TMR1
Enabled
Note 1: Arrows indicate counter increments.
2: In Counter mode, a falling edge must be registered by the counter prior to the first incrementing rising edge of the clock.
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FIGURE 19-3:
TIMER1 GATE ENABLE MODE
TMR1GE
T1GPOL
t1g_in
T1CKI
T1GVAL
Timer1
N
N + 1
N + 2
N + 3
N + 4
FIGURE 19-4:
TIMER1 GATE TOGGLE MODE
TMR1GE
T1GPOL
T1GTM
t1g_in
T1CKI
T1GVAL
Timer1
N
N + 1 N + 2 N + 3 N + 4
N + 5 N + 6 N + 7 N + 8
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FIGURE 19-5:
TIMER1 GATE SINGLE-PULSE MODE
TMR1GE
T1GPOL
T1GSPM
Cleared by hardware on
falling edge of T1GVAL
T1GGO/
DONE
Set by software
Counting enabled on
rising edge of T1G
t1g_in
T1CKI
T1GVAL
Timer1
N
N + 1
N + 2
Cleared by
software
Set by hardware on
falling edge of T1GVAL
Cleared by software
TMR1GIF
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FIGURE 19-6:
TMR1GE
T1GPOL
TIMER1 GATE SINGLE-PULSE AND TOGGLE COMBINED MODE
T1GSPM
T1GTM
Cleared by hardware on
falling edge of T1GVAL
T1GGO/
DONE
Set by software
Counting enabled on
rising edge of T1G
t1g_in
T1CKI
T1GVAL
Timer1
N + 4
N + 2 N + 3
N
N + 1
Set by hardware on
falling edge of T1GVAL
Cleared by
software
Cleared by software
TMR1GIF
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19.9 Register Definitions: Timer1 Control
REGISTER 19-1: T1CON: TIMER1 CONTROL REGISTER
R/W-0/u
R/W-0/u
R/W-0/u
R/W-0/u
R/W-0/u
R/W-0/u
T1SYNC
U-0
—
R/W-0/u
TMR1CS<1:0>
T1CKPS<1:0>
T1OSCEN
TMR1ON
bit 7
bit 0
Legend:
R = Readable bit
W = Writable bit
U = Unimplemented bit, read as ‘0’
-n/n = Value at POR and BOR/Value at all other Resets
u = Bit is unchanged
‘1’ = Bit is set
x = Bit is unknown
‘0’ = Bit is cleared
bit 7-6
TMR1CS<1:0>: Timer1 Clock Source Select bits
11=Timer1 clock source is LFINTOSC
10=Timer1 clock source is pin or oscillator:
If T1OSCEN = 0:
External clock from T1CKI pin (on the rising edge)
If T1OSCEN = 1:
Crystal oscillator on SOSCI/SOSCO pins
01=Timer1 clock source is system clock (FOSC)
00=Timer1 clock source is instruction clock (FOSC/4)
bit 5-4
T1CKPS<1:0>: Timer1 Input Clock Prescale Select bits
11= 1:8 Prescale value
10= 1:4 Prescale value
01= 1:2 Prescale value
00= 1:1 Prescale value
bit 3
bit 2
T1OSCEN: LP Oscillator Enable Control bit
1= Secondary oscillator circuit enabled for Timer1
0= Secondary oscillator circuit disabled for Timer1
T1SYNC: Timer1 Synchronization Control bit
1= Do not synchronize asynchronous clock input
0= Synchronize asynchronous clock input with system clock (FOSC)
bit 1
bit 0
Unimplemented: Read as ‘0’
TMR1ON: Timer1 On bit
1= Enables Timer1
0= Stops Timer1 and clears Timer1 gate flip-flop
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REGISTER 19-2: T1GCON: TIMER1 GATE CONTROL REGISTER
R/W-0/u
R/W-0/u
T1GPOL
R/W-0/u
T1GTM
R/W-0/u
R/W/HC-0/u
R-x/x
R/W-0/u
R/W-0/u
TMR1GE
T1GSPM
T1GGO/
DONE
T1GVAL
T1GSS<1:0>
bit 7
bit 0
Legend:
R = Readable bit
W = Writable bit
U = Unimplemented bit, read as ‘0’
u = Bit is unchanged
‘1’ = Bit is set
x = Bit is unknown
‘0’ = Bit is cleared
-n/n = Value at POR and BOR/Value at all other Resets
HC = Bit is cleared by hardware
bit 7
TMR1GE: Timer1 Gate Enable bit
If TMR1ON = 0:
This bit is ignored
If TMR1ON = 1:
1= Timer1 counting is controlled by the Timer1 gate function
0= Timer1 counts regardless of Timer1 gate function
bit 6
bit 5
T1GPOL: Timer1 Gate Polarity bit
1= Timer1 gate is active-high (Timer1 counts when gate is high)
0= Timer1 gate is active-low (Timer1 counts when gate is low)
T1GTM: Timer1 Gate Toggle Mode bit
1= Timer1 Gate Toggle mode is enabled
0= Timer1 Gate Toggle mode is disabled and toggle flip-flop is cleared
Timer1 gate flip-flop toggles on every rising edge.
bit 4
bit 3
bit 2
bit 0
T1GSPM: Timer1 Gate Single-Pulse Mode bit
1= Timer1 gate Single-Pulse mode is enabled and is controlling Timer1 gate
0= Timer1 gate Single-Pulse mode is disabled
T1GGO/DONE: Timer1 Gate Single-Pulse Acquisition Status bit
1= Timer1 gate single-pulse acquisition is ready, waiting for an edge
0= Timer1 gate single-pulse acquisition has completed or has not been started
T1GVAL: Timer1 Gate Value Status bit
Indicates the current state of the Timer1 gate that could be provided to TMR1H:TMR1L.
Unaffected by Timer1 Gate Enable (TMR1GE).
T1GSS<1:0>: Timer1 Gate Source Select bits
11= Comparator 2 optionally synchronized output (C2OUT_sync)
10= Comparator 1 optionally synchronized output (C1OUT_sync)
01= Timer0 overflow output (T0_overflow)
00= Timer1 gate pin (T1G)
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TABLE 19-5: SUMMARY OF REGISTERS ASSOCIATED WITH TIMER1
Register
on Page
Name
Bit 7
Bit 6
Bit 5
Bit 4
Bit 3
Bit 2
Bit 1
Bit 0
ANSELA
APFCON
INTCON
OSCSTAT
PIE1
—
—
—
—
—
—
ANSA4
SSSEL
INTE
—
ANSA2
—
ANSA1
ANSA0
113
110
76
T1GSEL
IOCIE
—
CLC1SEL NCO1SEL
GIE
PEIE
—
TMR0IE
OSTS
RCIE
RCIF
TMR0IF
—
INTF
IOCIF
SOSCR
TMR1GIE
TMR1GIF
HFIOFR
TXIE
LFIOFR
TMR2IE
TMR2IF
HFIOFS
TMR1IE
TMR1IF
61
ADIE
ADIF
SSP1IE
SSP1IF
—
77
PIR1
TXIF
—
81
TMR1H
TMR1L
TRISA
Holding Register for the Most Significant Byte of the 16-bit TMR1 Count
167*
167*
112
171
172
Holding Register for the Least Significant Byte of the 16-bit TMR1 Count
(1)
—
—
TRISA5
TRISA4
—
TRISA2
T1SYNC
T1GVAL
TRISA1
—
TRISA0
T1CON
T1GCON
TMR1CS<1:0>
TMR1GE T1GPOL
T1CKPS<1:0>
T1OSCEN
TMR1ON
T1GTM
T1GSPM
T1GGO/
DONE
T1GSS<1:0>
Legend:
— = unimplemented location, read as ‘0’. Shaded cells are not used by the Timer1 module.
*
Page provides register information.
Note 1: Unimplemented, read as ‘1’.
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NOTES:
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20.0 TIMER2 MODULE
The Timer2 module incorporates the following features:
• 8-bit Timer and Period registers (TMR2 and PR2,
respectively)
• Readable and writable (both registers)
• Software programmable prescaler (1:1, 1:4, 1:16,
and 1:64)
• Software programmable postscaler (1:1 to 1:16)
• Interrupt on TMR2 match with PR2
See Figure 20-1 for a block diagram of Timer2.
FIGURE 20-1:
TIMER2 BLOCK DIAGRAM
Rev. 10-000019A_A0
T2_match
To Peripherals
Prescaler
1:1, 1:4, 1:16, 1:64
R
TMR2
Fosc/4
2
Postscaler
1:1 to 1:16
set bit
TMR2IF
Comparator
PR2
T2CKPS<1:0>
4
T2OUTPS<3:0>
FIGURE 20-2:
TIMER2 TIMING DIAGRAM
Rev. 10-000020A_A0
FOSC/4
Prescale
PR2
1:4
0x03
0x03
0x00
0x01
0x02
0x00
0x01
0x02
TMR2
Pulse Width(1)
T2_match
Note 1: The Pulse Width of T2_match is equal to the scaled input of TMR2.
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20.1 Timer2 Operation
20.3 Timer2 Output
The clock input to the Timer2 module is the system
instruction clock (FOSC/4).
The output of TMR2 is T2_match. T2_match is available
to the following peripherals:
TMR2 increments from 00h on each clock edge.
• Configurable Logic Cell (CLC)
• Master Synchronous Serial Port (MSSP)
• Numerically Controlled Oscillator (NCO)
• Pulse Width Modulator (PWM)
A 4-bit counter/prescaler on the clock input allows direct
input, divide-by-4 and divide-by-16 prescale options.
These options are selected by the prescaler control bits,
T2CKPS<1:0> of the T2CON register. The value of
TMR2 is compared to that of the Period register, PR2, on
each clock cycle. When the two values match, the
comparator generates a match signal as the timer
output. This signal also resets the value of TMR2 to 00h
on the next cycle and drives the output counter/
postscaler (see Section 20.2 “Timer2 Interrupt”).
The T2_match signal is synchronous with the system
clock. Figure 20-3 shows two examples of the timing of
the T2_match signal relative to FOSC and prescale
value, T2CKPS<1:0>. The upper diagram illustrates 1:1
prescale timing and the lower diagram, 1:X prescale
timing.
The TMR2 and PR2 registers are both directly readable
and writable. The TMR2 register is cleared on any
device Reset, whereas the PR2 register initializes to
FFh. Both the prescaler and postscaler counters are
cleared on the following events:
FIGURE 20-3:
T2_MATCH TIMING
DIAGRAM
Rev. 10-000021A_A1
Q1
Q2
Q3
Q4
Q1
• a write to the TMR2 register
• a write to the T2CON register
• Power-On Reset (POR)
• Brown-Out Reset (BOR)
• MCLR Reset
FOSC
TCY1
FOSC/4
TMR2 = PR2
match
TMR2 = 0
T2_match
• Watchdog Timer (WDT) Reset
• Stack Overflow Reset
• Stack Underflow Reset
• RESETInstruction
PRESCALE = 1:1
(T2CKPS<1:0> = 00)
...
TCY1
TCY2
TCYX
Note:
TMR2 is not cleared when T2CON is
written.
...
...
FOSC/4
T2_match
TMR2 = PR2
match
TMR2 = 0
20.2 Timer2 Interrupt
Timer2 can also generate an optional device interrupt.
The Timer2 output signal (T2_match) provides the input
for the 4-bit counter/postscaler. This counter generates
the TMR2 match interrupt flag which is latched in
TMR2IF of the PIR1 register. The interrupt is enabled by
setting the TMR2 Match Interrupt Enable bit, TMR2IE of
the PIE1 register.
PRESCALE = 1:X
(T2CKPS<1:0> = 01,10,11)
20.4 Timer2 Operation During Sleep
Timer2 cannot be operated while the processor is in
Sleep mode. The contents of the TMR2 and PR2
registers will remain unchanged while the processor is
in Sleep mode.
A range of 16 postscale options (from 1:1 through 1:16
inclusive) can be selected with the postscaler control
bits, T2OUTPS<3:0>, of the T2CON register.
DS40001609B-page 176
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PIC16(L)F1508/9
20.5 Register Definitions: Timer2 Control
REGISTER 20-1: T2CON: TIMER2 CONTROL REGISTER
U-0
—
R/W-0/0
R/W-0/0
R/W-0/0
R/W-0/0
R/W-0/0
R/W-0/0
R/W-0/0
T2OUTPS<3:0>
TMR2ON
T2CKPS<1:0>
bit 7
bit 0
Legend:
R = Readable bit
W = Writable bit
U = Unimplemented bit, read as ‘0’
-n/n = Value at POR and BOR/Value at all other Resets
u = Bit is unchanged
‘1’ = Bit is set
x = Bit is unknown
‘0’ = Bit is cleared
bit 7
Unimplemented: Read as ‘0’
bit 6-3
T2OUTPS<3:0>: Timer2 Output Postscaler Select bits
0000= 1:1 Postscaler
0001= 1:2 Postscaler
0010= 1:3 Postscaler
0011= 1:4 Postscaler
0100= 1:5 Postscaler
0101= 1:6 Postscaler
0110= 1:7 Postscaler
0111= 1:8 Postscaler
1000= 1:9 Postscaler
1001= 1:10 Postscaler
1010= 1:11 Postscaler
1011= 1:12 Postscaler
1100= 1:13 Postscaler
1101= 1:14 Postscaler
1110= 1:15 Postscaler
1111= 1:16 Postscaler
bit 2
TMR2ON: Timer2 On bit
1= Timer2 is on
0= Timer2 is off
bit 1-0
T2CKPS<1:0>: Timer2 Clock Prescale Select bits
00= Prescaler is 1
01= Prescaler is 4
10= Prescaler is 16
11= Prescaler is 64
TABLE 20-1: SUMMARY OF REGISTERS ASSOCIATED WITH TIMER2
Register
on Page
Name
Bit 7
Bit 6
Bit 5
Bit 4
Bit 3
Bit 2
Bit 1
Bit 0
INTCON
PIE1
GIE
PEIE
ADIE
ADIF
TMR0IE
RCIE
INTE
TXIE
TXIF
IOCIE
SSP1IE
SSP1IF
TMR0IF
INTF
IOCIF
76
77
TMR1GIE
TMR1GIF
—
—
TMR2IE
TMR2IF
TMR1IE
TMR1IF
PIR1
RCIF
80
PR2
Timer2 Module Period Register
—
175*
177
175*
T2CON
TMR2
T2OUTPS<3:0>
TMR2ON
T2CKPS<1:0>
Holding Register for the 8-bit TMR2 Count
Legend:
— = unimplemented location, read as ‘0’. Shaded cells are not used for Timer2 module.
*
Page provides register information.
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NOTES:
DS40001609B-page 178
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PIC16(L)F1508/9
21.0 MASTER SYNCHRONOUS
SERIAL PORT (MSSP)
MODULE
21.1 MSSP Module Overview
The Master Synchronous Serial Port (MSSPx) module
is a serial interface useful for communicating with other
peripheral or microcontroller devices. These peripheral
devices may be serial EEPROMs, shift registers, dis-
play drivers, A/D converters, etc. The MSSPx module
can operate in one of two modes:
• Serial Peripheral Interface (SPI)
2
• Inter-Integrated Circuit (I C™)
The SPI interface supports the following modes and
features:
• Master mode
• Slave mode
• Clock Parity
• Slave Select Synchronization (Slave mode only)
• Daisy-chain connection of slave devices
Figure 21-1 is a block diagram of the SPI interface
module.
FIGURE 21-1:
MSSP BLOCK DIAGRAM (SPI MODE)
Data Bus
Write
Read
SSPBUF Reg
SSPSR Reg
SDI
SDO_out
Shift
Clock
bit 0
SDO
SS
Control
Enable
SSx
2 (CKP, CKE)
Clock Select
Edge
Select
SCK_out
SSPM<3:0>
T2_match
2
4
(
)
SCK
TOSC
Prescaler
4, 16, 64
Edge
Select
Baud Rate
Generator
(SSPxADD)
TRIS bit
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2
The I C interface supports the following modes and
The PIC16F1508/9 has one MSSP module.
features:
• Master mode
Note 1: In devices with more than one MSSP
module, it is very important to pay close
attention to SSPxCONx register names.
SSPxCON1 and SSPxCON2 registers
control different operational aspects of
the same module, while SSPxCON1 and
SSP2CON1 control the same features for
two different modules.
• Slave mode
• Byte NACKing (Slave mode)
• Limited Multi-master support
• 7-bit and 10-bit addressing
• Start and Stop interrupts
• Interrupt masking
• Clock stretching
2: Throughout this section, generic refer-
ences to an MSSPx module in any of its
operating modes may be interpreted as
being equally applicable to MSSPx or
MSSP2. Register names, module I/O sig-
nals, and bit names may use the generic
designator ‘x’ to indicate the use of a
numeral to distinguish a particular module
when required.
• Bus collision detection
• General call address matching
• Address masking
• Address Hold and Data Hold modes
• Selectable SDAx hold times
2
Figure 21-2 is a block diagram of the I C interface mod-
ule in Master mode. Figure 21-3 is a diagram of the I C
interface module in Slave mode.
2
2
FIGURE 21-2:
MSSPX BLOCK DIAGRAM (I C™ MASTER MODE)
Internal
data bus
[SSPM<3:0>]
Read
Write
SSPxBUF
SSPxSR
Baud Rate
Generator
(SSPxADD)
SDAx
Shift
Clock
SDAx in
MSb
LSb
Start bit, Stop bit,
Acknowledge
Generate (SSPxCON2)
SCLx
Start bit detect,
Stop bit detect
SCLx in
Bus Collision
Write collision detect
Clock arbitration
State counter for
Set/Reset: S, P, SSPxSTAT, WCOL, SSPOV
Reset SEN, PEN (SSPxCON2)
Set SSPxIF, BCLxIF
end of XMIT/RCV
Address Match detect
DS40001609B-page 180
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PIC16(L)F1508/9
2
FIGURE 21-3:
MSSP BLOCK DIAGRAM (I C™ SLAVE MODE)
Internal
Data Bus
Read
Write
SSPxBUF Reg
SSPxSR Reg
SCLx
SDAx
Shift
Clock
MSb
LSb
SSPxMSK Reg
Match Detect
SSPxADD Reg
Addr Match
Set, Reset
S, P bits
(SSPxSTAT Reg)
Start and
Stop bit Detect
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During each SPI clock cycle, a full-duplex data
transmission occurs. This means that while the master
device is sending out the MSb from its shift register (on
its SDOx pin) and the slave device is reading this bit
and saving it as the LSb of its shift register, that the
slave device is also sending out the MSb from its shift
register (on its SDOx pin) and the master device is
reading this bit and saving it as the LSb of its shift
register.
21.2 SPI Mode Overview
The Serial Peripheral Interface (SPI) bus is a
synchronous serial data communication bus that
operates in Full-Duplex mode. Devices communicate
in a master/slave environment where the master device
initiates the communication.
A slave device is
controlled through a Chip Select known as Slave
Select.
The SPI bus specifies four signal connections:
After eight bits have been shifted out, the master and
slave have exchanged register values.
• Serial Clock (SCKx)
• Serial Data Out (SDOx)
• Serial Data In (SDIx)
• Slave Select (SSx)
If there is more data to exchange, the shift registers are
loaded with new data and the process repeats itself.
Whether the data is meaningful or not (dummy data),
depends on the application software. This leads to
three scenarios for data transmission:
Figure 21-1 shows the block diagram of the MSSP
module when operating in SPI mode.
• Master sends useful data and slave sends
dummy data.
The SPI bus operates with a single master device and
one or more slave devices. When multiple slave
devices are used, an independent Slave Select con-
nection is required from the master device to each
slave device.
• Master sends useful data and slave sends useful
data.
• Master sends dummy data and slave sends use-
ful data.
Figure 21-4 shows a typical connection between a
master device and multiple slave devices.
Transmissions may involve any number of clock
cycles. When there is no more data to be transmitted,
the master stops sending the clock signal and it dese-
lects the slave.
The master selects only one slave at a time. Most slave
devices have tri-state outputs so their output signal
appears disconnected from the bus when they are not
selected.
Every slave device connected to the bus that has not
been selected through its slave select line must disre-
gard the clock and transmission signals and must not
transmit out any data of its own.
Transmissions involve two shift registers, eight bits in
size, one in the master and one in the slave. With either
the master or the slave device, data is always shifted
out one bit at a time, with the Most Significant bit (MSb)
shifted out first. At the same time, a new Least
Significant bit (LSb) is shifted into the same register.
Figure 21-5 shows a typical connection between two
processors configured as master and slave devices.
Data is shifted out of both shift registers on the pro-
grammed clock edge and latched on the opposite edge
of the clock.
The master device transmits information out on its
SDOx output pin which is connected to, and received
by, the slave’s SDIx input pin. The slave device trans-
mits information out on its SDOx output pin, which is
connected to, and received by, the master’s SDIx input
pin.
To begin communication, the master device first sends
out the clock signal. Both the master and the slave
devices should be configured for the same clock polar-
ity.
The master device starts a transmission by sending out
the MSb from its shift register. The slave device reads
this bit from that same line and saves it into the LSb
position of its shift register.
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PIC16(L)F1508/9
FIGURE 21-4:
SPI MASTER AND MULTIPLE SLAVE CONNECTION
SCKx
SDOx
SCKx
SDIx
SDOx
SSx
SPI Master
SPI Slave
#1
SDIx
General I/O
General I/O
General I/O
SCKx
SDIx
SDOx
SSx
SPI Slave
#2
SCKx
SDIx
SDOx
SSx
SPI Slave
#3
21.2.1 SPI MODE REGISTERS
The MSSP module has five registers for SPI mode
operation. These are:
• MSSP STATUS register (SSPxSTAT)
• MSSP Control Register 1 (SSPxCON1)
• MSSP Control Register 3 (SSPxCON3)
• MSSP Data Buffer register (SSPxBUF)
• MSSP Address register (SSPxADD)
• MSSP Shift register (SSPxSR)
(Not directly accessible)
SSPxCON1 and SSPxSTAT are the control and
STATUS registers in SPI mode operation. The
SSPxCON1 register is readable and writable. The
lower six bits of the SSPxSTAT are read-only. The
upper two bits of the SSPxSTAT are read/write.
In SPI master mode, SSPxADD can be loaded with a
value used in the Baud Rate Generator. More informa-
tion on the Baud Rate Generator is available in
Section 21.7 “Baud Rate Generator”.
SSPxSR is the shift register used for shifting data in
and out. SSPxBUF provides indirect access to the
SSPxSR register. SSPxBUF is the buffer register to
which data bytes are written, and from which data
bytes are read.
In receive operations, SSPxSR and SSPxBUF
together create a buffered receiver. When SSPxSR
receives a complete byte, it is transferred to SSPxBUF
and the SSPxIF interrupt is set.
During transmission, the SSPxBUF is not buffered. A
write to SSPxBUF will write to both SSPxBUF and
SSPxSR.
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21.2.2 SPI MODE OPERATION
When the application software is expecting to receive
valid data, the SSPxBUF should be read before the
next byte of data to transfer is written to the SSPxBUF.
The Buffer Full bit, BF of the SSPxSTAT register, indi-
cates when SSPxBUF has been loaded with the
received data (transmission is complete). When the
SSPxBUF is read, the BF bit is cleared. This data may
be irrelevant if the SPI is only a transmitter. Generally,
the MSSP interrupt is used to determine when the
transmission/reception has completed. If the interrupt
method is not going to be used, then software polling
can be done to ensure that a write collision does not
occur.
When initializing the SPI, several options need to be
specified. This is done by programming the appropriate
control bits (SSPxCON1<5:0> and SSPxSTAT<7:6>).
These control bits allow the following to be specified:
• Master mode (SCKx is the clock output)
• Slave mode (SCKx is the clock input)
• Clock Polarity (Idle state of SCKx)
• Data Input Sample Phase (middle or end of data
output time)
• Clock Edge (output data on rising/falling edge of
SCKx)
The SSPxSR is not directly readable or writable and
can only be accessed by addressing the SSPxBUF
register. Additionally, the SSPxSTAT register indicates
the various Status conditions.
• Clock Rate (Master mode only)
• Slave Select mode (Slave mode only)
To enable the serial port, SSP Enable bit, SSPEN of
the SSPxCON1 register, must be set. To reset or
reconfigure SPI mode, clear the SSPEN bit, re-initialize
the SSPxCONx registers and then set the SSPEN bit.
This configures the SDI, SDO, SCK and SS pins as
serial port pins. For the pins to behave as the serial port
function, some must have their data direction bits (in
the TRIS register) appropriately programmed as
follows:
• SDIx must have corresponding TRIS bit set
• SDOx must have corresponding TRIS bit cleared
• SCKx (Master mode) must have corresponding
TRIS bit cleared
• SCKx (Slave mode) must have corresponding
TRIS bit set
• SSx must have corresponding TRIS bit set
Any serial port function that is not desired may be
overridden by programming the corresponding data
direction (TRIS) register to the opposite value.
The MSSP consists of a transmit/receive shift register
(SSPxSR) and a buffer register (SSPxBUF). The
SSPxSR shifts the data in and out of the device, MSb
first. The SSPxBUF holds the data that was written to
the SSPxSR until the received data is ready. Once the
eight bits of data have been received, that byte is
moved to the SSPxBUF register. Then, the Buffer Full
Detect bit, BF of the SSPxSTAT register, and the
interrupt flag bit, SSPxIF, are set. This double-buffering
of the received data (SSPxBUF) allows the next byte to
start reception before reading the data that was just
received. Any write to the SSPxBUF register during
transmission/reception of data will be ignored and the
write collision detect bit, WCOL of the SSPxCON1
register, will be set. User software must clear the
WCOL bit to allow the following write(s) to the
SSPxBUF register to complete successfully.
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PIC16(L)F1508/9
FIGURE 21-5:
SPI MASTER/SLAVE CONNECTION
SPI Master SSPM<3:0> = 00xx
= 1010
SPI Slave SSPM<3:0> = 010x
SDOx
SDIx
Serial Input Buffer
Serial Input Buffer
(SSPxBUF)
(BUF)
SDIx
SDOx
Shift Register
(SSPxSR)
Shift Register
(SSPxSR)
LSb
MSb
MSb
LSb
Serial Clock
SCKx
SCKx
SSx
Slave Select
(optional)
General I/O
Processor 2
Processor 1
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The clock polarity is selected by appropriately
programming the CKP bit of the SSPxCON1 register
and the CKE bit of the SSPxSTAT register. This then,
would give waveforms for SPI communication as
shown in Figure 21-6, Figure 21-8, Figure 21-9 and
Figure 21-10, where the MSb is transmitted first. In
Master mode, the SPI clock rate (bit rate) is user
programmable to be one of the following:
21.2.3
SPI MASTER MODE
The master can initiate the data transfer at any time
because it controls the SCKx line. The master
determines when the slave (Processor 2, Figure 21-5)
is to broadcast data by the software protocol.
In Master mode, the data is transmitted/received as
soon as the SSPxBUF register is written to. If the SPI
is only going to receive, the SDOx output could be dis-
abled (programmed as an input). The SSPxSR register
will continue to shift in the signal present on the SDIx
pin at the programmed clock rate. As each byte is
received, it will be loaded into the SSPxBUF register as
if a normal received byte (interrupts and Status bits
appropriately set).
• FOSC/4 (or TCY)
• FOSC/16 (or 4 * TCY)
• FOSC/64 (or 16 * TCY)
• Timer2 output/2
• Fosc/(4 * (SSPxADD + 1))
Figure 21-6 shows the waveforms for Master mode.
When the CKE bit is set, the SDOx data is valid before
there is a clock edge on SCKx. The change of the input
sample is shown based on the state of the SMP bit. The
time when the SSPxBUF is loaded with the received
data is shown.
FIGURE 21-6:
SPI MODE WAVEFORM (MASTER MODE)
Write to
SSPxBUF
SCKx
(CKP = 0
CKE = 0)
SCKx
(CKP = 1
CKE = 0)
4 Clock
Modes
SCKx
(CKP = 0
CKE = 1)
SCKx
(CKP = 1
CKE = 1)
bit 6
bit 6
bit 2
bit 2
bit 5
bit 5
bit 4
bit 4
bit 1
bit 1
bit 0
bit 0
SDOx
(CKE = 0)
bit 7
bit 7
bit 3
bit 3
SDOx
(CKE = 1)
SDIx
(SMP = 0)
bit 0
bit 7
Input
Sample
(SMP = 0)
SDIx
(SMP = 1)
bit 0
bit 7
Input
Sample
(SMP = 1)
SSPxIF
SSPxSR to
SSPxBUF
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PIC16(L)F1508/9
21.2.4
SPI SLAVE MODE
21.2.5
SLAVE SELECT
SYNCHRONIZATION
In Slave mode, the data is transmitted and received as
external clock pulses appear on SCKx. When the last
bit is latched, the SSPxIF interrupt flag bit is set.
The Slave Select can also be used to synchronize com-
munication. The Slave Select line is held high until the
master device is ready to communicate. When the
Slave Select line is pulled low, the slave knows that a
new transmission is starting.
Before enabling the module in SPI Slave mode, the clock
line must match the proper Idle state. The clock line can
be observed by reading the SCKx pin. The Idle state is
determined by the CKP bit of the SSPxCON1 register.
If the slave fails to receive the communication properly,
it will be reset at the end of the transmission, when the
Slave Select line returns to a high state. The slave is
then ready to receive a new transmission when the
Slave Select line is pulled low again. If the Slave Select
line is not used, there is a risk that the slave will even-
tually become out of sync with the master. If the slave
misses a bit, it will always be one bit off in future trans-
missions. Use of the Slave Select line allows the slave
and master to align themselves at the beginning of
each transmission.
While in Slave mode, the external clock is supplied by
the external clock source on the SCKx pin. This exter-
nal clock must meet the minimum high and low times
as specified in the electrical specifications.
While in Sleep mode, the slave can transmit/receive
data. The shift register is clocked from the SCKx pin
input and when a byte is received, the device will gen-
erate an interrupt. If enabled, the device will wake-up
from Sleep.
21.2.4.1 Daisy-Chain Configuration
The SSx pin allows a Synchronous Slave mode. The
SPI must be in Slave mode with SSx pin control
enabled (SSPxCON1<3:0> = 0100).
The SPI bus can sometimes be connected in a
daisy-chain configuration. The first slave output is con-
nected to the second slave input, the second slave
output is connected to the third slave input, and so on.
The final slave output is connected to the master input.
Each slave sends out, during a second group of clock
pulses, an exact copy of what was received during the
first group of clock pulses. The whole chain acts as
one large communication shift register. The
daisy-chain feature only requires a single Slave Select
line from the master device.
When the SSx pin is low, transmission and reception
are enabled and the SDOx pin is driven.
When the SSx pin goes high, the SDOx pin is no longer
driven, even if in the middle of a transmitted byte and
becomes a floating output. External pull-up/pull-down
resistors may be desirable depending on the applica-
tion.
Note 1: When the SPI is in Slave mode with SSx
pin control enabled (SSPxCON1<3:0> =
0100), the SPI module will reset if the SSx
pin is set to VDD.
Figure 21-7 shows the block diagram of a typical
daisy-chain connection when operating in SPI mode.
In a daisy-chain configuration, only the most recent
byte on the bus is required by the slave. Setting the
BOEN bit of the SSPxCON3 register will enable writes
to the SSPxBUF register, even if the previous byte has
not been read. This allows the software to ignore data
that may not apply to it.
2: When the SPI is used in Slave mode with
CKE set; the user must enable SSx pin
control.
3: While operated in SPI Slave mode the
SMP bit of the SSPxSTAT register must
remain clear.
When the SPI module resets, the bit counter is forced
to ‘0’. This can be done by either forcing the SSx pin to
a high level or clearing the SSPEN bit.
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FIGURE 21-7:
SPI DAISY-CHAIN CONNECTION
SCK
SDOx
SCK
SDIx
SDOx
SSx
SPI Master
SPI Slave
#1
SDIx
General I/O
SCK
SDIx
SDOx
SSx
SPI Slave
#2
SCK
SDIx
SDOx
SSx
SPI Slave
#3
FIGURE 21-8:
SLAVE SELECT SYNCHRONOUS WAVEFORM
SSx
SCKx
(CKP = 0
CKE = 0)
SCKx
(CKP = 1
CKE = 0)
Write to
SSPxBUF
Shift register SSPxSR
and bit count are reset
SSPxBUF to
SSPxSR
bit 6
bit 6
bit 7
bit 7
bit 0
SDOx
SDIx
bit 7
bit 0
bit 7
Input
Sample
SSPxIF
Interrupt
Flag
SSPxSR to
SSPxBUF
DS40001609B-page 188
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PIC16(L)F1508/9
FIGURE 21-9:
SPI MODE WAVEFORM (SLAVE MODE WITH CKE = 0)
SSx
Optional
SCKx
(CKP = 0
CKE = 0)
SCKx
(CKP = 1
CKE = 0)
Write to
SSPxBUF
Valid
bit 6
bit 2
bit 5
bit 4
bit 3
bit 1
bit 0
SDOx
bit 7
SDIx
bit 0
bit 7
Input
Sample
SSPxIF
Interrupt
Flag
SSPxSR to
SSPxBUF
Write Collision
detection active
FIGURE 21-10:
SPI MODE WAVEFORM (SLAVE MODE WITH CKE = 1)
SSx
Not Optional
SCKx
(CKP = 0
CKE = 1)
SCKx
(CKP = 1
CKE = 1)
Write to
SSPxBUF
Valid
bit 6
bit 3
bit 2
bit 5
bit 4
bit 1
bit 0
SDOx
bit 7
bit 7
SDIx
bit 0
Input
Sample
SSPxIF
Interrupt
Flag
SSPxSR to
SSPxBUF
Write Collision
detection active
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21.2.6 SPI OPERATION IN SLEEP MODE
In SPI Master mode, module clocks may be operating
at a different speed than when in Full-Power mode; in
the case of the Sleep mode, all clocks are halted.
Special care must be taken by the user when the
MSSP clock is much faster than the system clock.
In Slave mode, when MSSP interrupts are enabled,
after the master completes sending data, an MSSP
interrupt will wake the controller from Sleep.
If an exit from Sleep mode is not desired, MSSP inter-
rupts should be disabled.
In SPI Master mode, when the Sleep mode is selected,
all module clocks are halted and the transmis-
sion/reception will remain in that state until the device
wakes. After the device returns to Run mode, the mod-
ule will resume transmitting and receiving data.
In SPI Slave mode, the SPI Transmit/Receive Shift
register operates asynchronously to the device. This
allows the device to be placed in Sleep mode and data
to be shifted into the SPI Transmit/Receive Shift
register. When all eight bits have been received, the
MSSP interrupt flag bit will be set and if enabled, will
wake the device.
TABLE 21-1: SUMMARY OF REGISTERS ASSOCIATED WITH SPI OPERATION
Register
on Page
Name
Bit 7
Bit 6
Bit 5
Bit 4
Bit 3
Bit 2
Bit 1
Bit 0
ANSELA
INTCON
PIE1
—
—
—
ANSA4
INTE
TXIE
—
ANSA2
TMR0IF
—
ANSA1
INTF
ANSA0
IOCIF
113
76
GIE
PEIE
ADIE
ADIF
TMR0IE
RCIE
IOCIE
SSP1IE
SSP1IF
TMR1GIE
TMR1GIF
TMR2IE
TMR2IF
TMR1IE
TMR1IF
77
PIR1
RCIF
TXIF
—
80
SSP1BUF Synchronous Serial Port Receive Buffer/Transmit Register
183*
230
232
228
112
120
SSP1CON1
WCOL
SSPOV
PCIE
CKE
SSPEN
SCIE
CKP
BOEN
P
SSPM<3:0>
SSP1CON3 ACKTIM
SDAHT
S
SBCDE
R/W
AHEN
UA
DHEN
BF
SSP1STAT
TRISA
SMP
—
D/A
(1)
—
—
TRISA5
TRISC5
TRISA4
TRISC4
TRISA2
TRISC2
TRISA1
TRISC1
TRISA0
TRISC0
TRISC
TRISC7
TRISC6
TRISC3
Legend:
— = Unimplemented location, read as ‘0’. Shaded cells are not used by the MSSP in SPI mode.
*
Page provides register information.
Note 1: Unimplemented, read as ‘1’.
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2
FIGURE 21-11:
I C MASTER/
21.3 I C MODE OVERVIEW
SLAVE CONNECTION
2
The Inter-Integrated Circuit Bus (I C) is a multi-master
serial data communication bus. Devices communicate
in a master/slave environment where the master
devices initiate the communication. A slave device is
controlled through addressing.
VDD
SCLx
SDAx
SCLx
2
The I C bus specifies two signal connections:
VDD
• Serial Clock (SCLx)
• Serial Data (SDAx)
Master
Slave
SDAx
Figure 21-2 and Figure 21-3 show the block diagrams
2
of the MSSP module when operating in I C mode.
Both the SCLx and SDAx connections are bidirectional
open-drain lines, each requiring pull-up resistors for the
supply voltage. Pulling the line to ground is considered
a logical zero and letting the line float is considered a
logical one.
The Acknowledge bit (ACK) is an active-low signal,
which holds the SDAx line low to indicate to the trans-
mitter that the slave device has received the transmit-
ted data and is ready to receive more.
Figure 21-11 shows a typical connection between two
processors configured as master and slave devices.
The transition of a data bit is always performed while
the SCLx line is held low. Transitions that occur while
the SCLx line is held high are used to indicate Start and
Stop bits.
2
The I C bus can operate with one or more master
devices and one or more slave devices.
If the master intends to write to the slave, then it repeat-
edly sends out a byte of data, with the slave responding
after each byte with an ACK bit. In this example, the
master device is in Master Transmit mode and the
slave is in Slave Receive mode.
There are four potential modes of operation for a given
device:
• Master Transmit mode
(master is transmitting data to a slave)
• Master Receive mode
If the master intends to read from the slave, then it
repeatedly receives a byte of data from the slave, and
responds after each byte with an ACK bit. In this exam-
ple, the master device is in Master Receive mode and
the slave is Slave Transmit mode.
(master is receiving data from a slave)
• Slave Transmit mode
(slave is transmitting data to a master)
• Slave Receive mode
(slave is receiving data from the master)
On the last byte of data communicated, the master
device may end the transmission by sending a Stop bit.
If the master device is in Receive mode, it sends the
Stop bit in place of the last ACK bit. A Stop bit is indi-
cated by a low-to-high transition of the SDAx line while
the SCLx line is held high.
To begin communication, a master device starts out in
Master Transmit mode. The master device sends out a
Start bit followed by the address byte of the slave it
intends to communicate with. This is followed by a sin-
gle Read/Write bit, which determines whether the mas-
ter intends to transmit to or receive data from the slave
device.
In some cases, the master may want to maintain con-
trol of the bus and re-initiate another transmission. If
so, the master device may send another Start bit in
place of the Stop bit or last ACK bit when it is in receive
mode.
If the requested slave exists on the bus, it will respond
with an Acknowledge bit, otherwise known as an ACK.
The master then continues in either Transmit mode or
Receive mode and the slave continues in the comple-
ment, either in Receive mode or Transmit mode,
respectively.
2
The I C bus specifies three message protocols;
• Single message where a master writes data to a
slave.
A Start bit is indicated by a high-to-low transition of the
SDAx line while the SCLx line is held high. Address and
data bytes are sent out, Most Significant bit (MSb) first.
The Read/Write bit is sent out as a logical one when the
master intends to read data from the slave, and is sent
out as a logical zero when it intends to write data to the
slave.
• Single message where a master reads data from
a slave.
• Combined message where a master initiates a
minimum of two writes, or two reads, or a
combination of writes and reads, to one or more
slaves.
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When one device is transmitting a logical one, or letting
the line float, and a second device is transmitting a log-
ical zero, or holding the line low, the first device can
detect that the line is not a logical one. This detection,
when used on the SCLx line, is called clock stretching.
Clock stretching gives slave devices a mechanism to
control the flow of data. When this detection is used on
the SDAx line, it is called arbitration. Arbitration
ensures that there is only one master device communi-
cating at any single time.
21.3.2
ARBITRATION
Each master device must monitor the bus for Start and
Stop bits. If the device detects that the bus is busy, it
cannot begin a new message until the bus returns to an
Idle state.
However, two master devices may try to initiate a trans-
mission on or about the same time. When this occurs,
the process of arbitration begins. Each transmitter
checks the level of the SDAx data line and compares it
to the level that it expects to find. The first transmitter to
observe that the two levels do not match, loses arbitra-
tion, and must stop transmitting on the SDAx line.
21.3.1
CLOCK STRETCHING
When a slave device has not completed processing
data, it can delay the transfer of more data through the
process of clock stretching. An addressed slave device
may hold the SCLx clock line low after receiving or
sending a bit, indicating that it is not yet ready to con-
tinue. The master that is communicating with the slave
will attempt to raise the SCLx line in order to transfer
the next bit, but will detect that the clock line has not yet
been released. Because the SCLx connection is
open-drain, the slave has the ability to hold that line low
until it is ready to continue communicating.
For example, if one transmitter holds the SDAx line to
a logical one (lets it float) and a second transmitter
holds it to a logical zero (pulls it low), the result is that
the SDAx line will be low. The first transmitter then
observes that the level of the line is different than
expected and concludes that another transmitter is
communicating.
The first transmitter to notice this difference is the one
that loses arbitration and must stop driving the SDAx
line. If this transmitter is also a master device, it also
must stop driving the SCLx line. It then can monitor the
lines for a Stop condition before trying to reissue its
transmission. In the meantime, the other device that
has not noticed any difference between the expected
and actual levels on the SDAx line continues with its
original transmission. It can do so without any compli-
cations, because so far, the transmission appears
exactly as expected with no other transmitter disturbing
the message.
Clock stretching allows receivers that cannot keep up
with a transmitter to control the flow of incoming data.
Slave Transmit mode can also be arbitrated, when a
master addresses multiple slaves, but this is less com-
mon.
If two master devices are sending a message to two dif-
ferent slave devices at the address stage, the master
sending the lower slave address always wins arbitra-
tion. When two master devices send messages to the
same slave address, and addresses can sometimes
refer to multiple slaves, the arbitration process must
continue into the data stage.
Arbitration usually occurs very rarely, but it is a neces-
sary process for proper multi-master support.
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2
TABLE 21-2: I C BUS TERMS
21.4 I C MODE OPERATION
TERM
Description
2
All MSSP I C communication is byte oriented and
Transmitter
The device which shifts data out
onto the bus.
shifted out MSb first. Six SFR registers and two
interrupt flags interface the module with the PIC
®
microcontroller and user software. Two pins, SDAx
and SCLx, are exercised by the module to communi-
cate with other external I C devices.
Receiver
Master
The device which shifts data in
from the bus.
2
The device that initiates a transfer,
generates clock signals and termi-
nates a transfer.
21.4.1
BYTE FORMAT
2
All communication in I C is done in 9-bit segments. A
byte is sent from a master to a slave or vice-versa,
followed by an Acknowledge bit sent back. After the
eighth falling edge of the SCLx line, the device output-
ting data on the SDAx changes that pin to an input and
reads in an acknowledge value on the next clock
pulse.
Slave
The device addressed by the
master.
Multi-master
Arbitration
A bus with more than one device
that can initiate data transfers.
Procedure to ensure that only one
master at a time controls the bus.
Winning arbitration ensures that
the message is not corrupted.
The clock signal, SCLx, is provided by the master.
Data is valid to change while the SCLx signal is low,
and sampled on the rising edge of the clock. Changes
on the SDAx line while the SCLx line is high define
special conditions on the bus, explained below.
Synchronization Procedure to synchronize the
clocks of two or more devices on
the bus.
Idle
No master is controlling the bus,
and both SDAx and SCLx lines are
high.
2
21.4.2
DEFINITION OF I C TERMINOLOGY
There is language and terminology in the description
Active
Any time one or more master
devices are controlling the bus.
2
of I C communication that have definitions specific to
2
I C. That word usage is defined below and may be
Addressed
Slave
Slave device that has received a
matching address and is actively
being clocked by a master.
used in the rest of this document without explanation.
2
This table was adapted from the Philips I CTM
specification.
Matching
Address
Address byte that is clocked into a
slave that matches the value
stored in SSPxADD.
21.4.3
SDAX AND SCLX PINS
2
Selection of any I C mode with the SSPEN bit set,
forces the SCLx and SDAx pins to be open-drain.
These pins should be set by the user to inputs by set-
ting the appropriate TRIS bits.
Write Request
Read Request
Slave receives a matching
address with R/W bit clear, and is
ready to clock in data.
Master sends an address byte with
the R/W bit set, indicating that it
wishes to clock data out of the
Slave. This data is the next and all
following bytes until a Restart or
Stop.
2
Note: Data is tied to output zero when an I C
mode is enabled.
21.4.4
SDAX HOLD TIME
The hold time of the SDAx pin is selected by the
SDAHT bit of the SSPxCON3 register. Hold time is the
time SDAx is held valid after the falling edge of SCLx.
Setting the SDAHT bit selects a longer 300 ns mini-
mum hold time and may help on buses with large
capacitance.
Clock Stretching When a device on the bus hold
SCLx low to stall communication.
Bus Collision
Any time the SDAx line is sampled
low by the module while it is out-
putting and expected high state.
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21.4.5 START CONDITION
21.4.7 RESTART CONDITION
2
The I C specification defines a Start condition as a
A Restart is valid any time that a Stop would be valid.
A master can issue a Restart if it wishes to hold the
bus after terminating the current transfer. A Restart
has the same effect on the slave that a Start would,
resetting all slave logic and preparing it to clock in an
address. The master may want to address the same or
another slave. Figure 21-13 shows the wave form for a
Restart condition.
transition of SDAx from a high to a low state while
SCLx line is high. A Start condition is always gener-
ated by the master and signifies the transition of the
bus from an Idle to an Active state. Figure 21-12
shows wave forms for Start and Stop conditions.
A bus collision can occur on a Start condition if the
module samples the SDAx line low before asserting it
low. This does not conform to the I C Specification
that states no bus collision can occur on a Start.
21.4.6 STOP CONDITION
2
In 10-bit Addressing Slave mode a Restart is required
for the master to clock data out of the addressed
slave. Once a slave has been fully addressed, match-
ing both high and low address bytes, the master can
issue a Restart and the high address byte with the
R/W bit set. The slave logic will then hold the clock
and prepare to clock out data.
A Stop condition is a transition of the SDAx line from
low-to-high state while the SCLx line is high.
Note: At least one SCLx low time must appear
before a Stop is valid, therefore, if the SDAx
line goes low then high again while the SCLx
line stays high, only the Start condition is
detected.
After a full match with R/W clear in 10-bit mode, a prior
match flag is set and maintained. Until a Stop condi-
tion, a high address with R/W clear, or high address
match fails.
21.4.8 START/STOP CONDITION INTERRUPT
MASKING
The SCIE and PCIE bits of the SSPxCON3 register
can enable the generation of an interrupt in Slave
modes that do not typically support this function. Slave
modes where interrupt on Start and Stop detect are
already enabled, these bits will have no effect.
2
FIGURE 21-12:
I C START AND STOP CONDITIONS
SDAx
SCLx
S
P
Change of
Change of
Data Allowed
Data Allowed
Stop
Start
Condition
Condition
2
FIGURE 21-13:
I C RESTART CONDITION
Sr
Change of
Change of
Data Allowed
Data Allowed
Restart
Condition
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21.4.9 ACKNOWLEDGE SEQUENCE
21.5.1.1 I C Slave 7-bit Addressing Mode
2
The ninth SCLx pulse for any transferred byte in I C is
dedicated as an Acknowledge. It allows receiving
devices to respond back to the transmitter by pulling
the SDAx line low. The transmitter must release con-
trol of the line during this time to shift in the response.
The Acknowledge (ACK) is an active-low signal, pull-
ing the SDAx line low indicated to the transmitter that
the device has received the transmitted data and is
ready to receive more.
In 7-bit Addressing mode, the LSb of the received data
byte is ignored when determining if there is an address
match.
2
21.5.1.2 I C Slave 10-bit Addressing Mode
In 10-bit Addressing mode, the first received byte is
compared to the binary value of ‘1 1 1 1 0 A9 A8 0’. A9
and A8 are the two MSbs of the 10-bit address and
stored in bits 2 and 1 of the SSPxADD register.
The result of an ACK is placed in the ACKSTAT bit of
the SSPxCON2 register.
After the acknowledge of the high byte the UA bit is set
and SCLx is held low until the user updates SSPxADD
with the low address. The low address byte is clocked
in and all eight bits are compared to the low address
value in SSPxADD. Even if there is not an address
match; SSPxIF and UA are set, and SCLx is held low
until SSPxADD is updated to receive a high byte
again. When SSPxADD is updated the UA bit is
cleared. This ensures the module is ready to receive
the high address byte on the next communication.
Slave software, when the AHEN and DHEN bits are
set, allow the user to set the ACK value sent back to
the transmitter. The ACKDT bit of the SSPxCON2 reg-
ister is set/cleared to determine the response.
Slave hardware will generate an ACK response if the
AHEN and DHEN bits of the SSPxCON3 register are
clear.
There are certain conditions where an ACK will not be
sent by the slave. If the BF bit of the SSPxSTAT regis-
ter or the SSPOV bit of the SSPxCON1 register are
set when a byte is received.
A high and low address match as a write request is
required at the start of all 10-bit addressing communi-
cation. A transmission can be initiated by issuing a
Restart once the slave is addressed, and clocking in
the high address with the R/W bit set. The slave hard-
ware will then acknowledge the read request and pre-
pare to clock out data. This is only valid for a slave
after it has received a complete high and low address
byte match.
When the module is addressed, after the eighth falling
edge of SCLx on the bus, the ACKTIM bit of the
SSPxCON3 register is set. The ACKTIM bit indicates
the acknowledge time of the active bus. The ACKTIM
Status bit is only active when the AHEN bit or DHEN
bit is enabled.
21.5.2 SLAVE RECEPTION
2
21.5 I C Slave Mode Operation
When the R/W bit of a matching received address byte
is clear, the R/W bit of the SSPxSTAT register is
cleared. The received address is loaded into the
SSPxBUF register and acknowledged.
The MSSP Slave mode operates in one of four modes
selected in the SSPM bits of SSPxCON1 register. The
modes can be divided into 7-bit and 10-bit Addressing
mode. 10-bit Addressing modes operate the same as
7-bit with some additional overhead for handling the
larger addresses.
When the overflow condition exists for a received
address, then not Acknowledge is given. An overflow
condition is defined as either bit BF of the SSPxSTAT
register is set, or bit SSPOV of the SSPxCON1 register
is set. The BOEN bit of the SSPxCON3 register modi-
fies this operation. For more information see
Register 21-4.
Modes with Start and Stop bit interrupts operate the
same as the other modes with SSPxIF additionally
getting set upon detection of a Start, Restart, or Stop
condition.
An MSSP interrupt is generated for each transferred
data byte. Flag bit, SSPxIF, must be cleared by soft-
ware.
21.5.1 SLAVE MODE ADDRESSES
The SSPxADD register (Register 21-6) contains the
Slave mode address. The first byte received after a
Start or Restart condition is compared against the
value stored in this register. If the byte matches, the
value is loaded into the SSPxBUF register and an
interrupt is generated. If the value does not match, the
module goes idle and no indication is given to the soft-
ware that anything happened.
When the SEN bit of the SSPxCON2 register is set,
SCLx will be held low (clock stretch) following each
received byte. The clock must be released by setting
the CKP bit of the SSPxCON1 register, except
sometimes in 10-bit mode. See Section 21.2.3 “SPI
Master Mode” for more detail.
The SSP Mask register (Register 21-5) affects the
address matching process. See Section 21.5.9
“SSPx Mask Register” for more information.
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21.5.2.1 7-bit Addressing Reception
21.5.2.2 7-bit Reception with AHEN and DHEN
This section describes a standard sequence of events
for the MSSP module configured as an I C slave in
7-bit Addressing mode. Figure 21-14 and Figure 21-15
are used as visual references for this description.
Slave device reception with AHEN and DHEN set
operate the same as without these options with extra
interrupts and clock stretching added after the eighth
falling edge of SCLx. These additional interrupts allow
the slave software to decide whether it wants to ACK
the receive address or data byte, rather than the hard-
ware. This functionality adds support for PMBus™ that
was not present on previous versions of this module.
2
This is a step by step process of what typically must
2
be done to accomplish I C communication.
1. Start bit detected.
2. S bit of SSPxSTAT is set; SSPxIF is set if inter-
rupt on Start detect is enabled.
This list describes the steps that need to be taken by
slave software to use these options for I C communi-
cation. Figure 21-16 displays a module using both
address and data holding. Figure 21-17 includes the
operation with the SEN bit of the SSPxCON2 register
set.
2
3. Matching address with R/W bit clear is received.
4. The slave pulls SDAx low sending an ACK to the
master, and sets SSPxIF bit.
5. Software clears the SSPxIF bit.
6. Software reads received address from
SSPxBUF clearing the BF flag.
1. S bit of SSPxSTAT is set; SSPxIF is set if inter-
rupt on Start detect is enabled.
7. If SEN = 1; Slave software sets CKP bit to
2. Matching address with R/W bit clear is clocked
in. SSPxIF is set and CKP cleared after the
eighth falling edge of SCLx.
release the SCLx line.
8. The master clocks out a data byte.
3. Slave clears the SSPxIF.
9. Slave drives SDAx low sending an ACK to the
master, and sets SSPxIF bit.
4. Slave can look at the ACKTIM bit of the
SSPxCON3 register to determine if the SSPxIF
was after or before the ACK.
10. Software clears SSPxIF.
11. Software reads the received byte from
SSPxBUF clearing BF.
5. Slave reads the address value from SSPxBUF,
clearing the BF flag.
12. Steps 8-12 are repeated for all received bytes
from the Master.
6. Slave sets ACK value clocked out to the master
by setting ACKDT.
13. Master sends Stop condition, setting P bit of
SSPxSTAT, and the bus goes idle.
7. Slave releases the clock by setting CKP.
8. SSPxIF is set after an ACK, not after a NACK.
9. If SEN = 1 the slave hardware will stretch the
clock after the ACK.
10. Slave clears SSPxIF.
Note: SSPxIF is still set after the ninth falling edge
of SCLx even if there is no clock stretching
and BF has been cleared. Only if NACK is
sent to master is SSPxIF not set
11. SSPxIF set and CKP cleared after eighth falling
edge of SCLx for a received data byte.
12. Slave looks at ACKTIM bit of SSPxCON3 to
determine the source of the interrupt.
13. Slave reads the received data from SSPxBUF
clearing BF.
14. Steps 7-14 are the same for each received data
byte.
15. Communication is ended by either the slave
sending an ACK = 1, or the master sending a
Stop condition. If a Stop is sent and Interrupt on
Stop Detect is disabled, the slave will only know
by polling the P bit of the SSPSTAT register.
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FIGURE 21-14:
I C SLAVE, 7-BIT ADDRESS, RECEPTION (SEN = 0, AHEN = 0, DHEN = 0)
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FIGURE 21-15:
I C SLAVE, 7-BIT ADDRESS, RECEPTION (SEN = 1, AHEN = 0, DHEN = 0)
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FIGURE 21-16:
I C SLAVE, 7-BIT ADDRESS, RECEPTION (SEN = 0, AHEN = 1, DHEN = 1)
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FIGURE 21-17:
I C SLAVE, 7-BIT ADDRESS, RECEPTION (SEN = 1, AHEN = 1, DHEN = 1)
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21.5.3
SLAVE TRANSMISSION
21.5.3.2
7-bit Transmission
When the R/W bit of the incoming address byte is set
and an address match occurs, the R/W bit of the
SSPxSTAT register is set. The received address is
loaded into the SSPxBUF register, and an ACK pulse is
sent by the slave on the ninth bit.
A master device can transmit a read request to a
slave, and then clock data out of the slave. The list
below outlines what software for a slave will need to
do to accomplish
a
standard transmission.
Figure 21-18 can be used as a reference to this list.
Following the ACK, slave hardware clears the CKP bit
and the SCLx pin is held low (see Section 21.5.6
“Clock Stretching” for more detail). By stretching the
clock, the master will be unable to assert another clock
pulse until the slave is done preparing the transmit
data.
1. Master sends a Start condition on SDAx and
SCLx.
2. S bit of SSPxSTAT is set; SSPxIF is set if inter-
rupt on Start detect is enabled.
3. Matching address with R/W bit set is received by
the slave setting SSPxIF bit.
The transmit data must be loaded into the SSPxBUF
register which also loads the SSPxSR register. Then
the SCLx pin should be released by setting the CKP bit
of the SSPxCON1 register. The eight data bits are
shifted out on the falling edge of the SCLx input. This
ensures that the SDAx signal is valid during the SCLx
high time.
4. Slave hardware generates an ACK and sets
SSPxIF.
5. SSPxIF bit is cleared by user.
6. Software reads the received address from
SSPxBUF, clearing BF.
7. R/W is set so CKP was automatically cleared
after the ACK.
The ACK pulse from the master-receiver is latched on
the rising edge of the ninth SCLx input pulse. This ACK
value is copied to the ACKSTAT bit of the SSPxCON2
register. If ACKSTAT is set (not ACK), then the data
transfer is complete. In this case, when the not ACK is
latched by the slave, the slave goes idle and waits for
another occurrence of the Start bit. If the SDAx line was
low (ACK), the next transmit data must be loaded into
the SSPxBUF register. Again, the SCLx pin must be
released by setting bit CKP.
8. The slave software loads the transmit data into
SSPxBUF.
9. CKP bit is set releasing SCLx, allowing the mas-
ter to clock the data out of the slave.
10. SSPxIF is set after the ACK response from the
master is loaded into the ACKSTAT register.
11. SSPxIF bit is cleared.
12. The slave software checks the ACKSTAT bit to
see if the master wants to clock out more data.
An MSSP interrupt is generated for each data transfer
byte. The SSPxIF bit must be cleared by software and
the SSPxSTAT register is used to determine the status
of the byte. The SSPxIF bit is set on the falling edge of
the ninth clock pulse.
Note 1: If the master ACKs the clock will be
stretched.
2: ACKSTAT is the only bit updated on the
rising edge of SCLx (ninth) rather than the
falling.
21.5.3.1
Slave Mode Bus Collision
13. Steps 9-13 are repeated for each transmitted
byte.
A slave receives a Read request and begins shifting
data out on the SDAx line. If a bus collision is detected
and the SBCDE bit of the SSPxCON3 register is set,
the BCLxIF bit of the PIRx register is set. Once a bus
collision is detected, the slave goes idle and waits to be
addressed again. User software can use the BCLxIF bit
to handle a slave bus collision.
14. If the master sends a not ACK; the clock is not
held, but SSPxIF is still set.
15. The master sends a Restart condition or a Stop.
16. The slave is no longer addressed.
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FIGURE 21-18:
I C SLAVE, 7-BIT ADDRESS, TRANSMISSION (AHEN = 0)
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21.5.3.3
7-bit Transmission with Address
Hold Enabled
Setting the AHEN bit of the SSPxCON3 register
enables additional clock stretching and interrupt gen-
eration after the eighth falling edge of a received
matching address. Once a matching address has
been clocked in, CKP is cleared and the SSPxIF inter-
rupt is set.
Figure 21-19 displays a standard waveform of a 7-bit
Address Slave Transmission with AHEN enabled.
1. Bus starts idle.
2. Master sends Start condition; the S bit of
SSPxSTAT is set; SSPxIF is set if interrupt on
Start detect is enabled.
3. Master sends matching address with R/W bit
set. After the eighth falling edge of the SCLx line
the CKP bit is cleared and SSPxIF interrupt is
generated.
4. Slave software clears SSPxIF.
5. Slave software reads ACKTIM bit of SSPxCON3
register, and R/W and D/A of the SSPxSTAT
register to determine the source of the interrupt.
6. Slave reads the address value from the
SSPxBUF register clearing the BF bit.
7. Slave software decides from this information if it
wishes to ACK or not ACK and sets the ACKDT
bit of the SSPxCON2 register accordingly.
8. Slave sets the CKP bit releasing SCLx.
9. Master clocks in the ACK value from the slave.
10. Slave hardware automatically clears the CKP bit
and sets SSPxIF after the ACK if the R/W bit is
set.
11. Slave software clears SSPxIF.
12. Slave loads value to transmit to the master into
SSPxBUF setting the BF bit.
Note: SSPxBUF cannot be loaded until after the
ACK.
13. Slave sets the CKP bit, releasing the clock.
14. Master clocks out the data from the slave and
sends an ACK value on the ninth SCLx pulse.
15. Slave hardware copies the ACK value into the
ACKSTAT bit of the SSPxCON2 register.
16. Steps 10-15 are repeated for each byte trans-
mitted to the master from the slave.
17. If the master sends a not ACK the slave
releases the bus allowing the master to send a
Stop and end the communication.
Note: Master must send a not ACK on the last byte
to ensure that the slave releases the SCLx
line to receive a Stop.
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FIGURE 21-19:
I C SLAVE, 7-BIT ADDRESS, TRANSMISSION (AHEN = 1)
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21.5.4 SLAVE MODE 10-BIT ADDRESS
RECEPTION
21.5.5 10-BIT ADDRESSING WITH ADDRESS OR
DATA HOLD
This section describes a standard sequence of events
for the MSSP module configured as an I C slave in
10-bit Addressing mode.
Reception using 10-bit addressing with AHEN or
DHEN set is the same as with 7-bit modes. The only
difference is the need to update the SSPxADD register
using the UA bit. All functionality, specifically when the
CKP bit is cleared and SCLx line is held low are the
same. Figure 21-21 can be used as a reference of a
slave in 10-bit addressing with AHEN set.
2
Figure 21-20 is used as a visual reference for this
description.
This is a step by step process of what must be done by
2
slave software to accomplish I C communication.
Figure 21-22 shows a standard waveform for a slave
transmitter in 10-bit Addressing mode.
1. Bus starts idle.
2. Master sends Start condition; S bit of SSPxSTAT
is set; SSPxIF is set if interrupt on Start detect is
enabled.
3. Master sends matching high address with R/W
bit clear; UA bit of the SSPxSTAT register is set.
4. Slave sends ACK and SSPxIF is set.
5. Software clears the SSPxIF bit.
6. Software reads received address from
SSPxBUF clearing the BF flag.
7. Slave loads low address into SSPxADD,
releasing SCLx.
8. Master sends matching low address byte to the
slave; UA bit is set.
Note: Updates to the SSPxADD register are not
allowed until after the ACK sequence.
9. Slave sends ACK and SSPxIF is set.
Note: If the low address does not match, SSPxIF
and UA are still set so that the slave soft-
ware can set SSPxADD back to the high
address. BF is not set because there is no
match. CKP is unaffected.
10. Slave clears SSPxIF.
11. Slave reads the received matching address
from SSPxBUF clearing BF.
12. Slave loads high address into SSPxADD.
13. Master clocks a data byte to the slave and
clocks out the slaves ACK on the ninth SCLx
pulse; SSPxIF is set.
14. If SEN bit of SSPxCON2 is set, CKP is cleared
by hardware and the clock is stretched.
15. Slave clears SSPxIF.
16. Slave reads the received byte from SSPxBUF
clearing BF.
17. If SEN is set the slave sets CKP to release the
SCLx.
18. Steps 13-17 repeat for each received byte.
19. Master sends Stop to end the transmission.
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FIGURE 21-20:
I C SLAVE, 10-BIT ADDRESS, RECEPTION (SEN = 1, AHEN = 0, DHEN = 0)
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FIGURE 21-21:
I C SLAVE, 10-BIT ADDRESS, RECEPTION (SEN = 0, AHEN = 1, DHEN = 0)
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FIGURE 21-22:
I C SLAVE, 10-BIT ADDRESS, TRANSMISSION (SEN = 0, AHEN = 0, DHEN = 0)
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21.5.6 CLOCK STRETCHING
21.5.6.2 10-bit Addressing Mode
Clock stretching occurs when a device on the bus
holds the SCLx line low, effectively pausing communi-
cation. The slave may stretch the clock to allow more
time to handle data or prepare a response for the mas-
ter device. A master device is not concerned with
stretching as anytime it is active on the bus and not
transferring data it is stretching. Any stretching done
by a slave is invisible to the master software and han-
dled by the hardware that generates SCLx.
In 10-bit Addressing mode, when the UA bit is set, the
clock is always stretched. This is the only time the
SCLx is stretched without CKP being cleared. SCLx is
released immediately after a write to SSPxADD.
Note: Previous versions of the module did not
stretch the clock if the second address byte
did not match.
21.5.6.3 Byte NACKing
The CKP bit of the SSPxCON1 register is used to con-
trol stretching in software. Any time the CKP bit is
cleared, the module will wait for the SCLx line to go
low and then hold it. Setting CKP will release SCLx
and allow more communication.
When the AHEN bit of SSPxCON3 is set; CKP is
cleared by hardware after the eighth falling edge of
SCLx for a received matching address byte. When the
DHEN bit of SSPxCON3 is set, CKP is cleared after
the eighth falling edge of SCLx for received data.
21.5.6.1 Normal Clock Stretching
Stretching after the eighth falling edge of SCLx allows
the slave to look at the received address or data and
decide if it wants to ACK the received data.
Following an ACK if the R/W bit of SSPxSTAT is set, a
read request, the slave hardware will clear CKP. This
allows the slave time to update SSPxBUF with data to
transfer to the master. If the SEN bit of SSPxCON2 is
set, the slave hardware will always stretch the clock
after the ACK sequence. Once the slave is ready, CKP
is set by software and communication resumes.
21.5.7 CLOCK SYNCHRONIZATION AND
THE CKP BIT
Any time the CKP bit is cleared, the module will wait
for the SCLx line to go low and then hold it. However,
clearing the CKP bit will not assert the SCLx output
low until the SCLx output is already sampled low.
Therefore, the CKP bit will not assert the SCLx line
Note 1: The BF bit has no effect on if the clock will
be stretched or not. This is different than
previous versions of the module that
would not stretch the clock, clear CKP, if
SSPxBUF was read before the ninth fall-
ing edge of SCLx.
2
until an external I C master device has already
asserted the SCLx line. The SCLx output will remain
low until the CKP bit is set and all other devices on the
2
I C bus have released SCLx. This ensures that a write
2: Previous versions of the module did not
stretch the clock for a transmission if
SSPxBUF was loaded before the ninth
falling edge of SCLx. It is now always
cleared for read requests.
to the CKP bit will not violate the minimum high time
requirement for SCLx (see Figure 21-23).
FIGURE 21-23:
CLOCK SYNCHRONIZATION TIMING
Q1 Q2 Q3 Q4 Q1 Q2 Q3 Q4 Q1 Q2 Q3 Q4 Q1 Q2 Q3 Q4 Q1 Q2 Q3 Q4 Q1 Q2 Q3 Q4 Q1 Q2 Q3 Q4
SDAx
SCLx
DX
DX ‚ – 1
Master device
asserts clock
CKP
Master device
releases clock
WR
SSPxCON1
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21.5.8 GENERAL CALL ADDRESS SUPPORT
In 10-bit Address mode, the UA bit will not be set on
the reception of the general call address. The slave
will prepare to receive the second byte as data, just as
it would in 7-bit mode.
2
The addressing procedure for the I C bus is such that
the first byte after the Start condition usually deter-
mines which device will be the slave addressed by the
master device. The exception is the general call
address which can address all devices. When this
address is used, all devices should, in theory, respond
with an acknowledge.
If the AHEN bit of the SSPxCON3 register is set, just
as with any other address reception, the slave hard-
ware will stretch the clock after the eighth falling edge
of SCLx. The slave must then set its ACKDT value and
release the clock with communication progressing as it
would normally.
The general call address is a reserved address in the
2
I C protocol, defined as address 0x00. When the
GCEN bit of the SSPxCON2 register is set, the slave
module will automatically ACK the reception of this
address regardless of the value stored in SSPxADD.
After the slave clocks in an address of all zeros with
the R/W bit clear, an interrupt is generated and slave
software can read SSPxBUF and respond.
Figure 21-24 shows
sequence.
a
General Call reception
FIGURE 21-24:
SLAVE MODE GENERAL CALL ADDRESS SEQUENCE
Address is compared to General Call Address
after ACK, set interrupt
Receiving Data
D5 D4 D3 D2 D1
ACK
9
R/W = 0
ACK
General Call Address
SDAx
D7 D6
D0
8
SCLx
1
2
3
4
5
6
7
8
9
1
2
3
4
5
6
7
S
SSPxIF
BF (SSPxSTAT<0>)
Cleared by software
SSPxBUF is read
GCEN (SSPxCON2<7>)
’1’
21.5.9 SSPx MASK REGISTER
An SSPx Mask (SSPxMSK) register (Register 21-5) is
2
available in I C Slave mode as a mask for the value
held in the SSPxSR register during an address
comparison operation. A zero (‘0’) bit in the SSPxMSK
register has the effect of making the corresponding bit
of the received address a “don’t care”.
This register is reset to all ‘1’s upon any Reset
condition and, therefore, has no effect on standard
SSPx operation until written with a mask value.
The SSPx Mask register is active during:
• 7-bit Address mode: address compare of A<7:1>.
• 10-bit Address mode: address compare of A<7:0>
only. The SSPx mask has no effect during the
reception of the first (high) byte of the address.
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21.6.1 I C MASTER MODE OPERATION
21.6 I C MASTER MODE
The master device generates all of the serial clock
pulses and the Start and Stop conditions. A transfer is
ended with a Stop condition or with a Repeated Start
condition. Since the Repeated Start condition is also
the beginning of the next serial transfer, the I C bus will
not be released.
Master mode is enabled by setting and clearing the
appropriate SSPM bits in the SSPxCON1 register and
by setting the SSPEN bit. In Master mode, the SDAx
and SCKx pins must be configured as inputs. The
MSSP peripheral hardware will override the output
driver TRIS controls when necessary to drive the pins
low.
2
In Master Transmitter mode, serial data is output
through SDAx, while SCLx outputs the serial clock. The
first byte transmitted contains the slave address of the
receiving device (seven bits) and the Read/Write (R/W)
bit. In this case, the R/W bit will be logic ‘0’. Serial data
is transmitted eight bits at a time. After each byte is
transmitted, an Acknowledge bit is received. Start and
Stop conditions are output to indicate the beginning
and the end of a serial transfer.
Master mode of operation is supported by interrupt
generation on the detection of the Start and Stop con-
ditions. The Stop (P) and Start (S) bits are cleared from
a Reset or when the MSSPx module is disabled. Con-
2
trol of the I C bus may be taken when the P bit is set,
or the bus is idle.
In Firmware Controlled Master mode, user code
2
conducts all I C bus operations based on Start and
In Master Receive mode, the first byte transmitted
contains the slave address of the transmitting device
(seven bits) and the R/W bit. In this case, the R/W bit
will be logic ‘1’. Thus, the first byte transmitted is a 7-bit
slave address followed by a ‘1’ to indicate the receive
bit. Serial data is received via SDAx, while SCLx out-
puts the serial clock. Serial data is received eight bits at
a time. After each byte is received, an Acknowledge bit
is transmitted. Start and Stop conditions indicate the
beginning and end of transmission.
Stop bit condition detection. Start and Stop condition
detection is the only active circuitry in this mode. All
other communication is done by the user software
directly manipulating the SDAx and SCLx lines.
The following events will cause the SSPx Interrupt Flag
bit, SSPxIF, to be set (SSPx interrupt, if enabled):
• Start condition detected
• Stop condition detected
• Data transfer byte transmitted/received
• Acknowledge transmitted/received
• Repeated Start generated
A Baud Rate Generator is used to set the clock
frequency output on SCLx. See Section 21.7 “Baud
Rate Generator” for more detail.
Note 1: The MSSPx module, when configured in
2
I C Master mode, does not allow queue-
ing of events. For instance, the user is not
allowed to initiate a Start condition and
immediately write the SSPxBUF register
to initiate transmission before the Start
condition is complete. In this case, the
SSPxBUF will not be written to and the
WCOL bit will be set, indicating that a
write to the SSPxBUF did not occur
2: When in Master mode, Start/Stop detec-
tion is masked and an interrupt is gener-
ated when the SEN/PEN bit is cleared and
the generation is complete.
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21.6.2 CLOCK ARBITRATION
Clock arbitration occurs when the master, during any
receive, transmit or Repeated Start/Stop condition,
releases the SCLx pin (SCLx allowed to float high).
When the SCLx pin is allowed to float high, the Baud
Rate Generator (BRG) is suspended from counting
until the SCLx pin is actually sampled high. When the
SCLx pin is sampled high, the Baud Rate Generator is
reloaded with the contents of SSPxADD<7:0> and
begins counting. This ensures that the SCLx high time
will always be at least one BRG rollover count in the
event that the clock is held low by an external device
(Figure 21-25).
FIGURE 21-25:
BAUD RATE GENERATOR TIMING WITH CLOCK ARBITRATION
SDAx
DX
DX ‚ – 1
SCLx deasserted but slave holds
SCLx low (clock arbitration)
SCLx allowed to transition high
SCLx
BRG decrements on
Q2 and Q4 cycles
BRG
Value
03h
02h
01h
00h (hold off)
03h
02h
SCLx is sampled high, reload takes
place and BRG starts its count
BRG
Reload
21.6.3 WCOL STATUS FLAG
If the user writes the SSPxBUF when a Start, Restart,
Stop, Receive or Transmit sequence is in progress, the
WCOL bit is set and the contents of the buffer are
unchanged (the write does not occur). Any time the
WCOL bit is set it indicates that an action on SSPxBUF
was attempted while the module was not idle.
Note:
Because queueing of events is not
allowed, writing to the lower five bits of
SSPxCON2 is disabled until the Start
condition is complete.
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21.6.4 I C MASTER MODE START
by hardware; the Baud Rate Generator is suspended,
leaving the SDAx line held low and the Start condition
is complete.
CONDITION TIMING
To initiate a Start condition (Figure 21-26), the user
sets the Start Enable bit, SEN bit of the SSPxCON2
register. If the SDAx and SCLx pins are sampled high,
the Baud Rate Generator is reloaded with the contents
of SSPxADD<7:0> and starts its count. If SCLx and
SDAx are both sampled high when the Baud Rate
Generator times out (TBRG), the SDAx pin is driven
low. The action of the SDAx being driven low while
SCLx is high is the Start condition and causes the S bit
of the SSPxSTAT1 register to be set. Following this,
the Baud Rate Generator is reloaded with the contents
of SSPxADD<7:0> and resumes its count. When the
Baud Rate Generator times out (TBRG), the SEN bit of
the SSPxCON2 register will be automatically cleared
Note 1: If at the beginning of the Start condition,
the SDAx and SCLx pins are already sam-
pled low, or if during the Start condition,
the SCLx line is sampled low before the
SDAx line is driven low, a bus collision
occurs, the Bus Collision Interrupt Flag,
BCLxIF, is set, the Start condition is
2
aborted and the I C module is reset into
its Idle state.
2
2: The Philips I C Specification states that a
bus collision cannot occur on a Start.
FIGURE 21-26:
FIRST START BIT TIMING
Set S bit (SSPxSTAT<3>)
Write to SEN bit occurs here
At completion of Start bit,
hardware clears SEN bit
and sets SSPxIF bit
SDAx = 1,
SCLx = 1
TBRG
TBRG
Write to SSPxBUF occurs here
2nd bit
SDAx
1st bit
TBRG
SCLx
S
TBRG
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21.6.5 I C MASTER MODE REPEATED
automatically cleared and the Baud Rate Generator will
not be reloaded, leaving the SDAx pin held low. As
soon as a Start condition is detected on the SDAx and
SCLx pins, the S bit of the SSPxSTAT register will be
set. The SSPxIF bit will not be set until the Baud Rate
Generator has timed out.
START CONDITION TIMING
A Repeated Start condition (Figure 21-27) occurs when
the RSEN bit of the SSPxCON2 register is pro-
grammed high and the master state machine is no lon-
ger active. When the RSEN bit is set, the SCLx pin is
asserted low. When the SCLx pin is sampled low, the
Baud Rate Generator is loaded and begins counting.
The SDAx pin is released (brought high) for one Baud
Rate Generator count (TBRG). When the Baud Rate
Generator times out, if SDAx is sampled high, the SCLx
pin will be deasserted (brought high). When SCLx is
sampled high, the Baud Rate Generator is reloaded
and begins counting. SDAx and SCLx must be sam-
pled high for one TBRG. This action is then followed by
assertion of the SDAx pin (SDAx = 0) for one TBRG
while SCLx is high. SCLx is asserted low. Following
this, the RSEN bit of the SSPxCON2 register will be
Note 1: If RSEN is programmed while any other
event is in progress, it will not take effect.
2: A bus collision during the Repeated Start
condition occurs if:
• SDAx is sampled low when SCLx
goes from low-to-high.
• SCLx goes low before SDAx is
asserted low. This may indicate
that another master is attempting to
transmit a data ‘1’.
FIGURE 21-27:
REPEAT START CONDITION WAVEFORM
S bit set by hardware
Write to SSPxCON2
occurs here
SDAx = 1,
At completion of Start bit,
hardware clears RSEN bit
and sets SSPxIF
SDAx = 1,
SCLx = 1
SCLx (no change)
TBRG
TBRG
TBRG
1st bit
SDAx
SCLx
Write to SSPxBUF occurs here
TBRG
Sr
Repeated Start
TBRG
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21.6.6 I C MASTER MODE TRANSMISSION
21.6.6.3
ACKSTAT Status Flag
In Transmit mode, the ACKSTAT bit of the SSPxCON2
register is cleared when the slave has sent an Acknowl-
edge (ACK = 0) and is set when the slave does not
Acknowledge (ACK = 1). A slave sends an Acknowl-
edge when it has recognized its address (including a
general call), or when the slave has properly received
its data.
Transmission of a data byte, a 7-bit address or the
other half of a 10-bit address is accomplished by simply
writing a value to the SSPxBUF register. This action will
set the Buffer Full flag bit, BF, and allow the Baud Rate
Generator to begin counting and start the next trans-
mission. Each bit of address/data will be shifted out
onto the SDAx pin after the falling edge of SCLx is
asserted. SCLx is held low for one Baud Rate Genera-
tor rollover count (TBRG). Data should be valid before
SCLx is released high. When the SCLx pin is released
high, it is held that way for TBRG. The data on the SDAx
pin must remain stable for that duration and some hold
time after the next falling edge of SCLx. After the eighth
bit is shifted out (the falling edge of the eighth clock),
the BF flag is cleared and the master releases SDAx.
This allows the slave device being addressed to
respond with an ACK bit during the ninth bit time if an
address match occurred, or if data was received prop-
erly. The status of ACK is written into the ACKSTAT bit
on the rising edge of the ninth clock. If the master
receives an Acknowledge, the Acknowledge Status bit,
ACKSTAT, is cleared. If not, the bit is set. After the ninth
clock, the SSPxIF bit is set and the master clock (Baud
Rate Generator) is suspended until the next data byte
is loaded into the SSPxBUF, leaving SCLx low and
SDAx unchanged (Figure 21-28).
21.6.6.4
Typical transmit sequence:
1. The user generates a Start condition by setting
the SEN bit of the SSPxCON2 register.
2. SSPxIF is set by hardware on completion of the
Start.
3. SSPxIF is cleared by software.
4. The MSSPx module will wait the required start
time before any other operation takes place.
5. The user loads the SSPxBUF with the slave
address to transmit.
6. Address is shifted out the SDAx pin until all eight
bits are transmitted. Transmission begins as
soon as SSPxBUF is written to.
7. The MSSPx module shifts in the ACK bit from
the slave device and writes its value into the
ACKSTAT bit of the SSPxCON2 register.
8. The MSSPx module generates an interrupt at
the end of the ninth clock cycle by setting the
SSPxIF bit.
After the write to the SSPxBUF, each bit of the address
will be shifted out on the falling edge of SCLx until all
seven address bits and the R/W bit are completed. On
the falling edge of the eighth clock, the master will
release the SDAx pin, allowing the slave to respond
with an Acknowledge. On the falling edge of the ninth
clock, the master will sample the SDAx pin to see if the
address was recognized by a slave. The status of the
ACK bit is loaded into the ACKSTAT Status bit of the
SSPxCON2 register. Following the falling edge of the
ninth clock transmission of the address, the SSPxIF is
set, the BF flag is cleared and the Baud Rate Generator
is turned off until another write to the SSPxBUF takes
place, holding SCLx low and allowing SDAx to float.
9. The user loads the SSPxBUF with eight bits of
data.
10. Data is shifted out the SDAx pin until all eight
bits are transmitted.
11. The MSSPx module shifts in the ACK bit from
the slave device and writes its value into the
ACKSTAT bit of the SSPxCON2 register.
12. Steps 8-11 are repeated for all transmitted data
bytes.
13. The user generates a Stop or Restart condition
by setting the PEN or RSEN bits of the
SSPxCON2 register. Interrupt is generated once
the Stop/Restart condition is complete.
21.6.6.1
BF Status Flag
In Transmit mode, the BF bit of the SSPxSTAT register
is set when the CPU writes to SSPxBUF and is cleared
when all eight bits are shifted out.
21.6.6.2
WCOL Status Flag
If the user writes the SSPxBUF when a transmit is
already in progress (i.e., SSPxSR is still shifting out a
data byte), the WCOL bit is set and the contents of the
buffer are unchanged (the write does not occur).
WCOL must be cleared by software before the next
transmission.
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FIGURE 21-28:
I C MASTER MODE WAVEFORM (TRANSMISSION, 7 OR 10-BIT ADDRESS)
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2
21.6.7.4 Typical Receive Sequence:
21.6.7
I C MASTER MODE RECEPTION
Master mode reception (Figure 21-29) is enabled by
programming the Receive Enable bit, RCEN bit of the
SSPxCON2 register.
1. The user generates a Start condition by setting
the SEN bit of the SSPxCON2 register.
2. SSPxIF is set by hardware on completion of the
Start.
Note:
The MSSPx module must be in an Idle
state before the RCEN bit is set or the
RCEN bit will be disregarded.
3. SSPxIF is cleared by software.
4. User writes SSPxBUF with the slave address to
transmit and the R/W bit set.
The Baud Rate Generator begins counting and on each
rollover, the state of the SCLx pin changes
(high-to-low/low-to-high) and data is shifted into the
SSPxSR. After the falling edge of the eighth clock, the
receive enable flag is automatically cleared, the con-
tents of the SSPxSR are loaded into the SSPxBUF, the
BF flag bit is set, the SSPxIF flag bit is set and the Baud
Rate Generator is suspended from counting, holding
SCLx low. The MSSP is now in Idle state awaiting the
next command. When the buffer is read by the CPU,
the BF flag bit is automatically cleared. The user can
then send an Acknowledge bit at the end of reception
by setting the Acknowledge Sequence Enable, ACKEN
bit of the SSPxCON2 register.
5. Address is shifted out the SDAx pin until all eight
bits are transmitted. Transmission begins as
soon as SSPxBUF is written to.
6. The MSSP module shifts in the ACK bit from the
slave device and writes its value into the
ACKSTAT bit of the SSPxCON2 register.
7. The MSSP module generates an interrupt at the
end of the ninth clock cycle by setting the
SSPxIF bit.
8. User sets the RCEN bit of the SSPxCON2 regis-
ter and the master clocks in a byte from the slave.
9. After the eighth falling edge of SCLx, SSPxIF
and BF are set.
10. Master clears SSPxIF and reads the received
byte from SSPxBUF, clears BF.
21.6.7.1
BF Status Flag
In receive operation, the BF bit is set when an address
or data byte is loaded into SSPxBUF from SSPxSR. It
is cleared when the SSPxBUF register is read.
11. Master sets ACK value sent to slave in ACKDT
bit of the SSPxCON2 register and initiates the
ACK by setting the ACKEN bit.
21.6.7.2
SSPOV Status Flag
12. Masters ACK is clocked out to the slave and
SSPxIF is set.
In receive operation, the SSPOV bit is set when eight
bits are received into the SSPxSR and the BF flag bit is
already set from a previous reception.
13. User clears SSPxIF.
14. Steps 8-13 are repeated for each received byte
from the slave.
21.6.7.3
WCOL Status Flag
15. Master sends a not ACK or Stop to end
communication.
If the user writes the SSPxBUF when a receive is
already in progress (i.e., SSPxSR is still shifting in a
data byte), the WCOL bit is set and the contents of the
buffer are unchanged (the write does not occur).
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2
FIGURE 21-29:
I C MASTER MODE WAVEFORM (RECEPTION, 7-BIT ADDRESS)
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21.6.8
ACKNOWLEDGE SEQUENCE
TIMING
21.6.9
STOP CONDITION TIMING
A Stop bit is asserted on the SDAx pin at the end of a
receive/transmit by setting the Stop Sequence Enable
bit, PEN bit of the SSPxCON2 register. At the end of a
receive/transmit, the SCLx line is held low after the
falling edge of the ninth clock. When the PEN bit is set,
the master will assert the SDAx line low. When the
SDAx line is sampled low, the Baud Rate Generator is
reloaded and counts down to ‘0’. When the Baud Rate
Generator times out, the SCLx pin will be brought high
and one TBRG (Baud Rate Generator rollover count)
later, the SDAx pin will be deasserted. When the SDAx
pin is sampled high while SCLx is high, the P bit of the
SSPxSTAT register is set. A TBRG later, the PEN bit is
cleared and the SSPxIF bit is set (Figure 21-31).
An Acknowledge sequence is enabled by setting the
Acknowledge Sequence Enable bit, ACKEN bit of the
SSPxCON2 register. When this bit is set, the SCLx pin is
pulled low and the contents of the Acknowledge data bit
are presented on the SDAx pin. If the user wishes to
generate an Acknowledge, then the ACKDT bit should
be cleared. If not, the user should set the ACKDT bit
before starting an Acknowledge sequence. The Baud
Rate Generator then counts for one rollover period
(TBRG) and the SCLx pin is deasserted (pulled high).
When the SCLx pin is sampled high (clock arbitration),
the Baud Rate Generator counts for TBRG. The SCLx pin
is then pulled low. Following this, the ACKEN bit is auto-
matically cleared, the Baud Rate Generator is turned off
and the MSSP module then goes into Idle mode
(Figure 21-30).
21.6.9.1
WCOL Status Flag
If the user writes the SSPxBUF when a Stop sequence
is in progress, then the WCOL bit is set and the
contents of the buffer are unchanged (the write does
not occur).
21.6.8.1
WCOL Status Flag
If the user writes the SSPxBUF when an Acknowledge
sequence is in progress, then the WCOL bit is set and
the contents of the buffer are unchanged (the write
does not occur).
FIGURE 21-30:
ACKNOWLEDGE SEQUENCE WAVEFORM
Acknowledge sequence starts here,
write to SSPxCON2
ACKEN automatically cleared
ACKEN = 1, ACKDT = 0
TBRG
ACK
TBRG
SDAx
SCLx
D0
8
9
SSPxIF
Cleared in
SSPxIF set at
the end of receive
software
Cleared in
software
SSPxIF set at the end
of Acknowledge sequence
Note: TBRG = one Baud Rate Generator period.
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FIGURE 21-31:
STOP CONDITION RECEIVE OR TRANSMIT MODE
SCLx = 1for TBRG, followed by SDAx = 1for TBRG
after SDAx sampled high. P bit (SSPxSTAT<4>) is set.
Write to SSPxCON2,
set PEN
PEN bit (SSPxCON2<2>) is cleared by
hardware and the SSPxIF bit is set
Falling edge of
9th clock
TBRG
SCLx
ACK
SDAx
P
TBRG
TBRG
TBRG
SCLx brought high after TBRG
SDAx asserted low before rising edge of clock
to setup Stop condition
Note: TBRG = one Baud Rate Generator period.
21.6.10 SLEEP OPERATION
21.6.13 MULTI -MASTER COMMUNICATION,
BUS COLLISION AND BUS
2
While in Sleep mode, the I C slave module can receive
ARBITRATION
addresses or data and when an address match or
complete byte transfer occurs, wake the processor
from Sleep (if the MSSP interrupt is enabled).
Multi-Master mode support is achieved by bus arbitra-
tion. When the master outputs address/data bits onto
the SDAx pin, arbitration takes place when the master
outputs a ‘1’ on SDAx, by letting SDAx float high and
another master asserts a ‘0’. When the SCLx pin floats
high, data should be stable. If the expected data on
SDAx is a ‘1’ and the data sampled on the SDAx pin is
‘0’, then a bus collision has taken place. The master will
set the Bus Collision Interrupt Flag, BCLxIF and reset
21.6.11 EFFECTS OF A RESET
A Reset disables the MSSP module and terminates the
current transfer.
21.6.12 MULTI-MASTER MODE
In Multi-Master mode, the interrupt generation on the
detection of the Start and Stop conditions allows the
determination of when the bus is free. The Stop (P) and
Start (S) bits are cleared from a Reset or when the
2
the I C port to its Idle state (Figure 21-32).
If a transmit was in progress when the bus collision
occurred, the transmission is halted, the BF flag is
cleared, the SDAx and SCLx lines are deasserted and
the SSPxBUF can be written to. When the user ser-
vices the bus collision Interrupt Service Routine and if
2
MSSP module is disabled. Control of the I C bus may
be taken when the P bit of the SSPxSTAT register is
set, or the bus is idle, with both the S and P bits clear.
When the bus is busy, enabling the SSP interrupt will
generate the interrupt when the Stop condition occurs.
2
the I C bus is free, the user can resume communica-
tion by asserting a Start condition.
In Multi-Master mode, the SDAx line must be monitored
for arbitration to see if the signal level is the expected
output level. This check is performed by hardware with
the result placed in the BCLxIF bit.
If a Start, Repeated Start, Stop or Acknowledge condi-
tion was in progress when the bus collision occurred, the
condition is aborted, the SDAx and SCLx lines are deas-
serted and the respective control bits in the SSPxCON2
register are cleared. When the user services the bus col-
lision Interrupt Service Routine and if the I C bus is free,
the user can resume communication by asserting a Start
condition.
The states where arbitration can be lost are:
2
• Address Transfer
• Data Transfer
• A Start Condition
The master will continue to monitor the SDAx and SCLx
pins. If a Stop condition occurs, the SSPxIF bit will be set.
• A Repeated Start Condition
• An Acknowledge Condition
A write to the SSPxBUF will start the transmission of
data at the first data bit, regardless of where the
transmitter left off when the bus collision occurred.
In Multi-Master mode, the interrupt generation on the
detection of Start and Stop conditions allows the deter-
2
mination of when the bus is free. Control of the I C bus
can be taken when the P bit is set in the SSPxSTAT
register, or the bus is idle and the S and P bits are
cleared.
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FIGURE 21-32:
BUS COLLISION TIMING FOR TRANSMIT AND ACKNOWLEDGE
Sample SDAx. While SCLx is high,
data does not match what is driven
by the master.
Data changes
while SCLx = 0
SDAx line pulled low
by another source
Bus collision has occurred.
SDAx released
by master
SDAx
SCLx
Set bus collision
interrupt (BCLxIF)
BCLxIF
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If the SDAx pin is sampled low during this count, the
BRG is reset and the SDAx line is asserted early
(Figure 21-35). If, however, a ‘1’ is sampled on the SDA
pin, the SDA pin is asserted low at the end of the BRG
count. The Baud Rate Generator is then reloaded and
counts down to zero; if the SCL pin is sampled as ‘0’
during this time, a bus collision does not occur. At the
end of the BRG count, the SCL pin is asserted low.
21.6.13.1 Bus Collision During a Start
Condition
During a Start condition, a bus collision occurs if:
a) SDA or SCL are sampled low at the beginning of
the Start condition (Figure 21-33).
b) SCL is sampled low before SDAx is asserted
low (Figure 21-34).
During a Start condition, both the SDAx and the SCL
pins are monitored.
Note:
The reason that bus collision is not a fac-
tor during a Start condition is that no two
bus masters can assert a Start condition
at the exact same time. Therefore, one
master will always assert SDAx before the
other. This condition does not cause a bus
collision because the two masters must be
allowed to arbitrate the first address fol-
lowing the Start condition. If the address is
the same, arbitration must be allowed to
continue into the data portion, Repeated
Start or Stop conditions.
If the SDA pin is already low, or the SCL pin is already
low, then all of the following occur:
• the Start condition is aborted,
• the BCL1IF flag is set and
•
the MSSP module is reset to its Idle state
(Figure 21-33).
The Start condition begins with the SDAx and SCLx
pins deasserted. When the SDAx pin is sampled high,
the Baud Rate Generator is loaded and counts down. If
the SCLx pin is sampled low while SDAx is high, a bus
collision occurs because it is assumed that another
master is attempting to drive a data ‘1’ during the Start
condition.
FIGURE 21-33:
BUS COLLISION DURING START CONDITION (SDAX ONLY)
SDAx goes low before the SEN bit is set.
Set BCLxIF,
S bit and SSPxIF set because
SDAx = 0, SCLx = 1.
SDAx
SCLx
SEN
Set SEN, enable Start
condition if SDAx = 1, SCLx = 1
SEN cleared automatically because of bus collision.
SSP module reset into Idle state.
SDAx sampled low before
Start condition. Set BCLxIF.
S bit and SSPxIF set because
SDAx = 0, SCLx = 1.
BCLxIF
SSPxIF and BCLxIF are
cleared by software
S
SSPxIF
SSPxIF and BCLxIF are
cleared by software
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FIGURE 21-34:
BUS COLLISION DURING START CONDITION (SCLX = 0)
SDAx = 0, SCLx = 1
TBRG
TBRG
SDAx
Set SEN, enable Start
sequence if SDAx = 1, SCLx = 1
SCLx
SEN
SCLx = 0before SDAx = 0,
bus collision occurs. Set BCLxIF.
SCLx = 0before BRG time-out,
bus collision occurs. Set BCLxIF.
BCLxIF
Interrupt cleared
by software
S
‘0’
‘0’
‘0’
‘0’
SSPxIF
FIGURE 21-35:
BRG RESET DUE TO SDA ARBITRATION DURING START CONDITION
SDAx = 0, SCLx = 1
Set S
Set SSPxIF
Less than TBRG
TBRG
SDAx pulled low by other master.
Reset BRG and assert SDAx.
SDAx
SCLx
S
SCLx pulled low after BRG
time-out
SEN
Set SEN, enable Start
sequence if SDAx = 1, SCLx = 1
‘0’
BCLxIF
S
SSPxIF
Interrupts cleared
by software
SDAx = 0, SCLx = 1,
set SSPxIF
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If SDAx is low, a bus collision has occurred (i.e., another
master is attempting to transmit a data ‘0’, Figure 21-36).
If SDAx is sampled high, the BRG is reloaded and
begins counting. If SDAx goes from high-to-low before
the BRG times out, no bus collision occurs because no
two masters can assert SDAx at exactly the same time.
21.6.13.2 Bus Collision During a Repeated
Start Condition
During a Repeated Start condition, a bus collision
occurs if:
a) A low level is sampled on SDAx when SCLx
goes from low level to high level (Case 1).
If SCLx goes from high-to-low before the BRG times
out and SDAx has not already been asserted, a bus
collision occurs. In this case, another master is
attempting to transmit a data ‘1’ during the Repeated
Start condition, see Figure 21-37.
b) SCLx goes low before SDAx is asserted low,
indicating that another master is attempting to
transmit a data ‘1’ (Case 2).
When the user releases SDAx and the pin is allowed to
float high, the BRG is loaded with SSPxADD and
counts down to zero. The SCLx pin is then deasserted
and when sampled high, the SDAx pin is sampled.
If, at the end of the BRG time-out, both SCLx and SDAx
are still high, the SDAx pin is driven low and the BRG
is reloaded and begins counting. At the end of the
count, regardless of the status of the SCLx pin, the
SCLx pin is driven low and the Repeated Start
condition is complete.
FIGURE 21-36:
BUS COLLISION DURING A REPEATED START CONDITION (CASE 1)
SDAx
SCLx
Sample SDAx when SCLx goes high.
If SDAx = 0, set BCLxIF and release SDAx and SCLx.
RSEN
BCLxIF
Cleared by software
‘0’
S
‘0’
SSPxIF
FIGURE 21-37:
BUS COLLISION DURING REPEATED START CONDITION (CASE 2)
TBRG
TBRG
SDAx
SCLx
SCLx goes low before SDAx,
BCLxIF
RSEN
set BCLxIF. Release SDAx and SCLx.
Interrupt cleared
by software
‘0’
S
SSPxIF
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The Stop condition begins with SDAx asserted low.
When SDAx is sampled low, the SCLx pin is allowed to
float. When the pin is sampled high (clock arbitration),
the Baud Rate Generator is loaded with SSPxADD and
counts down to 0. After the BRG times out, SDAx is
sampled. If SDAx is sampled low, a bus collision has
occurred. This is due to another master attempting to
drive a data ‘0’ (Figure 21-38). If the SCLx pin is
sampled low before SDAx is allowed to float high, a bus
collision occurs. This is another case of another master
attempting to drive a data ‘0’ (Figure 21-39).
21.6.13.3 Bus Collision During a Stop
Condition
Bus collision occurs during a Stop condition if:
a) After the SDAx pin has been deasserted and
allowed to float high, SDAx is sampled low after
the BRG has timed out (Case 1).
b) After the SCLx pin is deasserted, SCLx is
sampled low before SDAx goes high (Case 2).
FIGURE 21-38:
BUS COLLISION DURING A STOP CONDITION (CASE 1)
SDAx sampled
low after TBRG,
set BCLxIF
TBRG
TBRG
TBRG
SDAx
SDAx asserted low
SCLx
PEN
BCLxIF
P
‘0’
‘0’
SSPxIF
FIGURE 21-39:
BUS COLLISION DURING A STOP CONDITION (CASE 2)
TBRG
TBRG
TBRG
SDAx
SCLx goes low before SDAx goes high,
set BCLxIF
Assert SDAx
SCLx
PEN
BCLxIF
P
‘0’
‘0’
SSPxIF
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2
TABLE 21-3: SUMMARY OF REGISTERS ASSOCIATED WITH I C™ OPERATION
Reset
Valueson
Page:
Name
Bit 7
Bit 6
Bit 5
Bit 4
Bit 3
Bit 2
Bit 1
Bit 0
INTCON
PIE1
GIE
TMR1GIE
OSFIE
TMR1GIF
OSFIF
—
PEIE
ADIE
C2IE
TMR0IE
RCIE
INTE
TXIE
—
IOCIE
SSP1IE
BCL1IE
SSP1IF
BCL1IF
TMR0IF
—
INTF
TMR2IE
—
IOCIF
TMR1IE
—
76
77
C1IE
PIE2
NCO1IE
—
78
PIR1
ADIF
C2IF
RCIF
C1IF
TXIF
—
TMR2IF
—
TMR1IF
—
80
NCO1IF
TRISA2
PIR2
81
(1)
—
TRISA
TRISA5
TRISA4
TRISA1
TRISA0
112
233
183*
230
231
232
233
228
—
SSP1ADD
SSP1BUF
SSP1CON1
SSP1CON2
SSP1CON3
SSP1MSK
SSP1STAT
ADD<7:0>
MSSP Receive Buffer/Transmit Register
WCOL
GCEN
SSPOV
ACKSTAT
PCIE
SSPEN
ACKDT
SCIE
CKP
ACKEN
BOEN
SSPM<3:0>
RCEN
PEN
RSEN
AHEN
SEN
ACKTIM
SDAHT
SBCDE
DHEN
MSK<7:0>
SMP
CKE
D/A
P
S
R/W
UA
BF
Legend:
— = unimplemented location, read as ‘0’. Shaded cells are not used by the MSSP module in I2C™ mode.
*
Page provides register information.
Note 1: Unimplemented, read as ‘1’.
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module clock line. The logic dictating when the reload
signal is asserted depends on the mode the MSSP is
being operated in.
21.7 BAUD RATE GENERATOR
The MSSP module has a Baud Rate Generator avail-
2
able for clock generation in both I C and SPI Master
Table 21-4 demonstrates clock rates based on
instruction cycles and the BRG value loaded into
SSPxADD.
modes. The Baud Rate Generator (BRG) reload value
is placed in the SSPxADD register (Register 21-6).
When a write occurs to SSPxBUF, the Baud Rate Gen-
erator will automatically begin counting down.
EQUATION 21-1:
Once the given operation is complete, the internal clock
will automatically stop counting and the clock pin will
remain in its last state.
FOSC
FCLOCK = -------------------------------------------------
SSPxADD + 14
An internal signal “Reload” in Figure 21-40 triggers the
value from SSPxADD to be loaded into the BRG
counter. This occurs twice for each oscillation of the
FIGURE 21-40:
BAUD RATE GENERATOR BLOCK DIAGRAM
SSPM<3:0>
SSPxADD<7:0>
SSPM<3:0>
SCLx
Reload
Control
Reload
BRG Down Counter
SSPxCLK
FOSC/2
Note: Values of 0x00, 0x01 and 0x02 are not valid
for SSPxADD when used as a Baud Rate
2
Generator for I C. This is an implementation
limitation.
TABLE 21-4: MSSP CLOCK RATE W/BRG
FCLOCK
(Two Rollovers of BRG)
FOSC
FCY
BRG Value
16 MHz
16 MHz
16 MHz
4 MHz
4 MHz
4 MHz
4 MHz
1 MHz
09h
0Ch
27h
09h
400 kHz
308 kHz
100 kHz
100 kHz
Note:
Refer to the I/O port electrical specifications in Table 29-4 to ensure the system is designed to support lol
requirements.
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21.8 Register Definitions: MSSP Control
REGISTER 21-1: SSPxSTAT: SSP STATUS REGISTER
R/W-0/0
SMP
R/W-0/0
CKE
R-0/0
D/A
R-0/0
P
R-0/0
S
R-0/0
R/W
R-0/0
UA
R-0/0
BF
bit 7
bit 0
Legend:
R = Readable bit
u = Bit is unchanged
‘1’ = Bit is set
W = Writable bit
x = Bit is unknown
‘0’ = Bit is cleared
U = Unimplemented bit, read as ‘0’
-n/n = Value at POR and BOR/Value at all other Resets
bit 7
SMP: SPI Data Input Sample bit
SPI Master mode:
1= Input data sampled at end of data output time
0= Input data sampled at middle of data output time
SPI Slave mode:
SMP must be cleared when SPI is used in Slave mode
In I2C Master or Slave mode:
1 = Slew rate control disabled
0 = Slew rate control enabled
bit 6
CKE: SPI Clock Edge Select bit (SPI mode only)
In SPI Master or Slave mode:
1= Transmit occurs on transition from active to Idle clock state
0= Transmit occurs on transition from Idle to active clock state
In I2C™ mode only:
1= Enable input logic so that thresholds are compliant with SMBus specification
0= Disable SMBus specific inputs
bit 5
bit 4
D/A: Data/Address bit (I2C mode only)
1= Indicates that the last byte received or transmitted was data
0= Indicates that the last byte received or transmitted was address
P: Stop bit
(I2C mode only. This bit is cleared when the MSSP module is disabled, SSPEN is cleared.)
1= Indicates that a Stop bit has been detected last (this bit is ‘0’ on Reset)
0= Stop bit was not detected last
bit 3
bit 2
S: Start bit
(I2C mode only. This bit is cleared when the MSSP module is disabled, SSPEN is cleared.)
1= Indicates that a Start bit has been detected last (this bit is ‘0’ on Reset)
0= Start bit was not detected last
R/W: Read/Write bit information (I2C mode only)
This bit holds the R/W bit information following the last address match. This bit is only valid from the address match
to the next Start bit, Stop bit, or not ACK bit.
In I2C Slave mode:
1= Read
0= Write
In I2C Master mode:
1= Transmit is in progress
0= Transmit is not in progress
OR-ing this bit with SEN, RSEN, PEN, RCEN or ACKEN will indicate if the MSSP is in Idle mode.
bit 1
UA: Update Address bit (10-bit I2C mode only)
1= Indicates that the user needs to update the address in the SSPxADD register
0= Address does not need to be updated
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REGISTER 21-1: SSPxSTAT: SSP STATUS REGISTER (CONTINUED)
bit 0
BF: Buffer Full Status bit
Receive (SPI and I2C modes):
1= Receive complete, SSPxBUF is full
0= Receive not complete, SSPxBUF is empty
Transmit (I2C mode only):
1= Data transmit in progress (does not include the ACK and Stop bits), SSPxBUF is full
0= Data transmit complete (does not include the ACK and Stop bits), SSPxBUF is empty
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REGISTER 21-2: SSPxCON1: SSP CONTROL REGISTER 1
R/C/HS-0/0
WCOL
R/C/HS-0/0
SSPOV(1)
R/W-0/0
SSPEN
R/W-0/0
CKP
R/W-0/0
R/W-0/0
R/W-0/0
R/W-0/0
SSPM<3:0>
bit 7
bit 0
Legend:
R = Readable bit
u = Bit is unchanged
‘1’ = Bit is set
W = Writable bit
x = Bit is unknown
‘0’ = Bit is cleared
U = Unimplemented bit, read as ‘0’
-n/n = Value at POR and BOR/Value at all other Resets
HS = Bit is set by hardware C = User cleared
bit 7
WCOL: Write Collision Detect bit
Master mode:
2
1= A write to the SSPxBUF register was attempted while the I C conditions were not valid for a transmission to be started
0= No collision
Slave mode:
1= The SSPxBUF register is written while it is still transmitting the previous word (must be cleared in software)
0= No collision
bit 6
SSPOV: Receive Overflow Indicator bit(1)
In SPI mode:
1= A new byte is received while the SSPxBUF register is still holding the previous data. In case of overflow, the data in SSPxSR is lost.
Overflow can only occur in Slave mode. In Slave mode, the user must read the SSPxBUF, even if only transmitting data, to avoid
setting overflow. In Master mode, the overflow bit is not set since each new reception (and transmission) is initiated by writing to the
SSPxBUF register (must be cleared in software).
0= No overflow
2
In I C mode:
1= A byte is received while the SSPxBUF register is still holding the previous byte. SSPOV is a “don’t care” in Transmit mode
(must be cleared in software).
0= No overflow
bit 5
SSPEN: Synchronous Serial Port Enable bit
In both modes, when enabled, these pins must be properly configured as input or output
In SPI mode:
1= Enables serial port and configures SCKx, SDOx, SDIx and SSx as the source of the serial port pins(2)
0= Disables serial port and configures these pins as I/O port pins
2
In I C mode:
1= Enables the serial port and configures the SDAx and SCLx pins as the source of the serial port pins(3)
0= Disables serial port and configures these pins as I/O port pins
bit 4
CKP: Clock Polarity Select bit
In SPI mode:
1= Idle state for clock is a high level
0= Idle state for clock is a low level
2
In I C Slave mode:
SCLx release control
1= Enable clock
0= Holds clock low (clock stretch). (Used to ensure data setup time.)
2
In I C Master mode:
Unused in this mode
bit 3-0
SSPM<3:0>: Synchronous Serial Port Mode Select bits
0000= SPI Master mode, clock = FOSC/4
0001= SPI Master mode, clock = FOSC/16
0010= SPI Master mode, clock = FOSC/64
0011= SPI Master mode, clock = T2_match/2
0100= SPI Slave mode, clock = SCKx pin, SS pin control enabled
0101= SPI Slave mode, clock = SCKx pin, SS pin control disabled, SSx can be used as I/O pin
2
0110= I C Slave mode, 7-bit address
2
0111= I C Slave mode, 10-bit address
2
1000= I C Master mode, clock = FOSC/(4 * (SSPxADD+1))(4)
1001= Reserved
1010= SPI Master mode, clock = FOSC/(4 * (SSPxADD+1))(5)
2
1011= I C firmware controlled Master mode (Slave idle)
1100= Reserved
1101= Reserved
2
1110= I C Slave mode, 7-bit address with Start and Stop bit interrupts enabled
2
1111= I C Slave mode, 10-bit address with Start and Stop bit interrupts enabled
Note 1:
In Master mode, the overflow bit is not set since each new reception (and transmission) is initiated by writing to the SSPxBUF register.
When enabled, these pins must be properly configured as input or output.
2:
3:
4:
5:
When enabled, the SDAx and SCLx pins must be configured as inputs.
2
SSPxADD values of 0, 1 or 2 are not supported for I C mode.
SSPxADD value of ‘0’ is not supported. Use SSPM = 0000instead.
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PIC16(L)F1508/9
(1)
REGISTER 21-3: SSPxCON2: SSP CONTROL REGISTER 2
R/W-0/0
GCEN
R-0/0
R/W-0/0
ACKDT
R/S/HS-0/0 R/S/HS-0/0
ACKEN RCEN
R/S/HS-0/0
PEN
R/S/HS-0/0 R/W/HS-0/0
RSEN SEN
bit 0
ACKSTAT
bit 7
Legend:
R = Readable bit
W = Writable bit
U = Unimplemented bit, read as ‘0’
u = Bit is unchanged
‘1’ = Bit is set
x = Bit is unknown
‘0’ = Bit is cleared
-n/n = Value at POR and BOR/Value at all other Resets
HC = Cleared by hardware S = User set
2
bit 7
bit 6
bit 5
GCEN: General Call Enable bit (in I C Slave mode only)
1= Enable interrupt when a general call address (0x00 or 00h) is received in the SSPxSR
0= General call address disabled
2
ACKSTAT: Acknowledge Status bit (in I C mode only)
1= Acknowledge was not received
0= Acknowledge was received
2
ACKDT: Acknowledge Data bit (in I C mode only)
In Receive mode:
Value transmitted when the user initiates an Acknowledge sequence at the end of a receive
1= Not Acknowledge
0= Acknowledge
2
bit 4
ACKEN: Acknowledge Sequence Enable bit (in I C Master mode only)
In Master Receive mode:
1= Initiate Acknowledge sequence on SDAx and SCLx pins, and transmit ACKDT data bit.
Automatically cleared by hardware.
0= Acknowledge sequence idle
2
bit 3
bit 2
RCEN: Receive Enable bit (in I C Master mode only)
2
1= Enables Receive mode for I C
0= Receive idle
2
PEN: Stop Condition Enable bit (in I C Master mode only)
SCKx Release Control:
1= Initiate Stop condition on SDAx and SCLx pins. Automatically cleared by hardware.
0= Stop condition idle
2
bit 1
bit 0
RSEN: Repeated Start Condition Enable bit (in I C Master mode only)
1= Initiate Repeated Start condition on SDAx and SCLx pins. Automatically cleared by hardware.
0= Repeated Start condition idle
SEN: Start Condition Enable/Stretch Enable bit
In Master mode:
1= Initiate Start condition on SDAx and SCLx pins. Automatically cleared by hardware.
0= Start condition idle
In Slave mode:
1= Clock stretching is enabled for both slave transmit and slave receive (stretch enabled)
0= Clock stretching is disabled
2
Note 1: For bits ACKEN, RCEN, PEN, RSEN, SEN: If the I C module is not in the Idle mode, this bit may not be
set (no spooling) and the SSPxBUF may not be written (or writes to the SSPxBUF are disabled).
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PIC16(L)F1508/9
REGISTER 21-4: SSPxCON3: SSP CONTROL REGISTER 3
R-0/0
R/W-0/0
PCIE
R/W-0/0
SCIE
R/W-0/0
BOEN
R/W-0/0
SDAHT
R/W-0/0
SBCDE
R/W-0/0
AHEN
R/W-0/0
DHEN
(3)
ACKTIM
bit 7
bit 0
Legend:
R = Readable bit
W = Writable bit
U = Unimplemented bit, read as ‘0’
u = Bit is unchanged
‘1’ = Bit is set
x = Bit is unknown
‘0’ = Bit is cleared
-n/n = Value at POR and BOR/Value at all other Resets
2
(3)
bit 7
bit 6
bit 5
bit 4
ACKTIM: Acknowledge Time Status bit (I C mode only)
2
1= Indicates the I C bus is in an Acknowledge sequence, set on eighth falling edge of SCLx clock
0= Not an Acknowledge sequence, cleared on ninth rising edge of SCLx clock
2
PCIE: Stop Condition Interrupt Enable bit (I C mode only)
1= Enable interrupt on detection of Stop condition
(2)
0= Stop detection interrupts are disabled
2
SCIE: Start Condition Interrupt Enable bit (I C mode only)
1= Enable interrupt on detection of Start or Restart conditions
(2)
0= Start detection interrupts are disabled
BOEN: Buffer Overwrite Enable bit
(1)
In SPI Slave mode:
1= SSPxBUF updates every time that a new data byte is shifted in ignoring the BF bit
0= If new byte is received with BF bit of the SSPxSTAT register already set, SSPOV bit of the
SSPxCON1 register is set, and the buffer is not updated
2
In I C Master mode:
This bit is ignored.
In I C Slave mode:
2
1= SSPxBUF is updated and ACK is generated for a received address/data byte, ignoring the
state of the SSPOV bit only if the BF bit = 0.
0= SSPxBUF is only updated when SSPOV is clear
2
bit 3
bit 2
SDAHT: SDAx Hold Time Selection bit (I C mode only)
1= Minimum of 300 ns hold time on SDAx after the falling edge of SCLx
0= Minimum of 100 ns hold time on SDAx after the falling edge of SCLx
2
SBCDE: Slave Mode Bus Collision Detect Enable bit (I C Slave mode only)
If on the rising edge of SCLx, SDAx is sampled low when the module is outputting a high state, the
BCLxIF bit of the PIR2 register is set, and bus goes idle
1= Enable slave bus collision interrupts
0= Slave bus collision interrupts are disabled
2
bit 1
bit 0
AHEN: Address Hold Enable bit (I C Slave mode only)
1= Following the eighth falling edge of SCLx for a matching received address byte, CKP bit of the
SSPxCON1 register will be cleared and the SCLx will be held low.
0= Address holding is disabled
2
DHEN: Data Hold Enable bit (I C Slave mode only)
1= Following the eighth falling edge of SCLx for a received data byte, slave hardware clears the CKP
bit of the SSPxCON1 register and SCLx is held low.
0= Data holding is disabled
Note 1: For daisy-chained SPI operation, allows the user to ignore all but the last received byte. SSPOV is still set
when a new byte is received and BF = 1, but hardware continues to write the most recent byte to SSPxBUF.
2: This bit has no effect in Slave modes that Start and Stop condition detection is explicitly listed as enabled.
3: The ACKTIM Status bit is only active when the AHEN bit or DHEN bit is set.
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PIC16(L)F1508/9
REGISTER 21-5: SSPxMSK: SSP MASK REGISTER
R/W-1/1
R/W-1/1
R/W-1/1
R/W-1/1
R/W-1/1
R/W-1/1
R/W-1/1
R/W-1/1
MSK<7:0>
bit 7
bit 0
Legend:
R = Readable bit
W = Writable bit
U = Unimplemented bit, read as ‘0’
u = Bit is unchanged
‘1’ = Bit is set
x = Bit is unknown
‘0’ = Bit is cleared
-n/n = Value at POR and BOR/Value at all other Resets
bit 7-1
bit 0
MSK<7:1>: Mask bits
2
1= The received address bit n is compared to SSPxADD<n> to detect I C address match
0= The received address bit n is not used to detect I C address match
2
2
MSK<0>: Mask bit for I C Slave mode, 10-bit Address
2
I C Slave mode, 10-bit address (SSPM<3:0> = 0111or 1111):
2
1= The received address bit 0 is compared to SSPxADD<0> to detect I C address match
2
0= The received address bit 0 is not used to detect I C address match
2
I C Slave mode, 7-bit address, the bit is ignored
2
REGISTER 21-6: SSPxADD: MSSP ADDRESS AND BAUD RATE REGISTER (I C MODE)
R/W-0/0
R/W-0/0
R/W-0/0
R/W-0/0
R/W-0/0
R/W-0/0
R/W-0/0
R/W-0/0
ADD<7:0>
bit 7
bit 0
Legend:
R = Readable bit
W = Writable bit
U = Unimplemented bit, read as ‘0’
-n/n = Value at POR and BOR/Value at all other Resets
u = Bit is unchanged
‘1’ = Bit is set
x = Bit is unknown
‘0’ = Bit is cleared
Master mode:
bit 7-0
ADD<7:0>: Baud Rate Clock Divider bits
SCLx pin clock period = ((ADD<7:0> + 1) *4)/FOSC
10-Bit Slave mode – Most Significant Address Byte:
bit 7-3
Not used: Unused for Most Significant Address Byte. Bit state of this register is a “don’t care”. Bit pat-
tern sent by master is fixed by I C specification and must be equal to ‘11110’. However, those bits are
2
compared by hardware and are not affected by the value in this register.
bit 2-1
bit 0
ADD<2:1>: Two Most Significant bits of 10-bit address
Not used: Unused in this mode. Bit state is a “don’t care”.
10-Bit Slave mode – Least Significant Address Byte:
bit 7-0
ADD<7:0>: Eight Least Significant bits of 10-bit address
7-Bit Slave mode:
bit 7-1
bit 0
ADD<7:1>: 7-bit address
Not used: Unused in this mode. Bit state is a “don’t care”.
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NOTES:
DS40001609B-page 234
2011-2013 Microchip Technology Inc.
PIC16(L)F1508/9
The EUSART module includes the following capabilities:
22.0 ENHANCED UNIVERSAL
SYNCHRONOUS
• Full-duplex asynchronous transmit and receive
• Two-character input buffer
ASYNCHRONOUS RECEIVER
TRANSMITTER (EUSART)
• One-character output buffer
• Programmable 8-bit or 9-bit character length
• Address detection in 9-bit mode
The Enhanced Universal Synchronous Asynchronous
Receiver Transmitter (EUSART) module is a serial I/O
communications peripheral. It contains all the clock
generators, shift registers and data buffers necessary
to perform an input or output serial data transfer
independent of device program execution. The
EUSART, also known as a Serial Communications
Interface (SCI), can be configured as a full-duplex
asynchronous system or half-duplex synchronous
• Input buffer overrun error detection
• Received character framing error detection
• Half-duplex synchronous master
• Half-duplex synchronous slave
• Programmable clock polarity in synchronous
modes
• Sleep operation
system.
Full-Duplex
mode
is
useful
for
The EUSART module implements the following
additional features, making it ideally suited for use in
Local Interconnect Network (LIN) bus systems:
communications with peripheral systems, such as CRT
terminals and personal computers. Half-Duplex
Synchronous mode is intended for communications
with peripheral devices, such as A/D or D/A integrated
circuits, serial EEPROMs or other microcontrollers.
These devices typically do not have internal clocks for
baud rate generation and require the external clock
signal provided by a master synchronous device.
• Automatic detection and calibration of the baud rate
• Wake-up on Break reception
• 13-bit Break character transmit
Block diagrams of the EUSART transmitter and
receiver are shown in Figure 22-1 and Figure 22-2.
The EUSART transmit output (TX_out) is available to
the TX/CK pin and internally to the following peripherals:
• Configurable Logic Cell (CLC)
FIGURE 22-1:
EUSART TRANSMIT BLOCK DIAGRAM
Data Bus
TXIE
Interrupt
TXIF
TXREG Register
8
TX/CK pin
MSb
(8)
LSb
0
Pin Buffer
and Control
• • •
Transmit Shift Register (TSR)
TX_out
TXEN
TRMT
Baud Rate Generator
BRG16
FOSC
÷ n
TX9
n
+ 1
Multiplier x4
x16 x64
TX9D
SYNC
BRGH
BRG16
1
X
X
X
1
1
0
1
0
0
0
1
0
0
0
SPBRGH
SPBRGL
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PIC16(L)F1508/9
FIGURE 22-2:
EUSART RECEIVE BLOCK DIAGRAM
SPEN
CREN
OERR
RCIDL
RX/DT pin
RSR Register
MSb
Stop (8)
LSb
Start
Pin Buffer
and Control
Data
Recovery
7
1
0
• • •
Baud Rate Generator
FOSC
RX9
÷ n
BRG16
n
+ 1
Multiplier x4
x16 x64
SYNC
BRGH
BRG16
1
X
X
X
1
1
0
1
0
0
0
1
0
0
0
FIFO
SPBRGH
SPBRGL
RX9D
FERR
RCREG Register
8
Data Bus
RCIF
RCIE
Interrupt
The operation of the EUSART module is controlled
through three registers:
• Transmit Status and Control (TXSTA)
• Receive Status and Control (RCSTA)
• Baud Rate Control (BAUDCON)
These registers are detailed in Register 22-1,
Register 22-2 and Register 22-3, respectively.
When the receiver or transmitter section is not enabled
then the corresponding RX or TX pin may be used for
general purpose input and output.
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PIC16(L)F1508/9
22.1.1.2
Transmitting Data
22.1 EUSART Asynchronous Mode
A transmission is initiated by writing a character to the
TXREG register. If this is the first character, or the
previous character has been completely flushed from
the TSR, the data in the TXREG is immediately
transferred to the TSR register. If the TSR still contains
all or part of a previous character, the new character
data is held in the TXREG until the Stop bit of the
previous character has been transmitted. The pending
character in the TXREG is then transferred to the TSR
in one TCY immediately following the Stop bit
transmission. The transmission of the Start bit, data bits
and Stop bit sequence commences immediately
following the transfer of the data to the TSR from the
TXREG.
The EUSART transmits and receives data using the
standard non-return-to-zero (NRZ) format. NRZ is
implemented with two levels: a VOH mark state which
represents a ‘1’ data bit, and a VOL space state which
represents a ‘0’ data bit. NRZ refers to the fact that
consecutively transmitted data bits of the same value
stay at the output level of that bit without returning to a
neutral level between each bit transmission. An NRZ
transmission port idles in the mark state. Each character
transmission consists of one Start bit followed by eight
or nine data bits and is always terminated by one or
more Stop bits. The Start bit is always a space and the
Stop bits are always marks. The most common data
format is eight bits. Each transmitted bit persists for a
period of 1/(Baud Rate). An on-chip dedicated
8-bit/16-bit Baud Rate Generator is used to derive
standard baud rate frequencies from the system
oscillator. See Table 22-5 for examples of baud rate
configurations.
22.1.1.3
Transmit Data Polarity
The polarity of the transmit data can be controlled with
the SCKP bit of the BAUDCON register. The default
state of this bit is ‘0’ which selects high true transmit idle
and data bits. Setting the SCKP bit to ‘1’ will invert the
transmit data resulting in low true idle and data bits. The
SCKP bit controls transmit data polarity in
Asynchronous mode only. In Synchronous mode, the
SCKP bit has a different function. See Section 22.5.1.2
“Clock Polarity”.
The EUSART transmits and receives the LSb first. The
EUSART’s transmitter and receiver are functionally
independent, but share the same data format and baud
rate. Parity is not supported by the hardware, but can
be implemented in software and stored as the ninth
data bit.
22.1.1.4
Transmit Interrupt Flag
22.1.1
EUSART ASYNCHRONOUS
TRANSMITTER
The TXIF interrupt flag bit of the PIR1 register is set
whenever the EUSART transmitter is enabled and no
character is being held for transmission in the TXREG.
In other words, the TXIF bit is only clear when the TSR
is busy with a character and a new character has been
queued for transmission in the TXREG. The TXIF flag
bit is not cleared immediately upon writing TXREG.
TXIF becomes valid in the second instruction cycle
following the write execution. Polling TXIF immediately
following the TXREG write will return invalid results. The
TXIF bit is read-only, it cannot be set or cleared by
software.
The EUSART transmitter block diagram is shown in
Figure 22-1. The heart of the transmitter is the serial
Transmit Shift Register (TSR), which is not directly
accessible by software. The TSR obtains its data from
the transmit buffer, which is the TXREG register.
22.1.1.1
Enabling the Transmitter
The EUSART transmitter is enabled for asynchronous
operations by configuring the following three control
bits:
• TXEN = 1
• SYNC = 0
• SPEN = 1
The TXIF interrupt can be enabled by setting the TXIE
interrupt enable bit of the PIE1 register. However, the
TXIF flag bit will be set whenever the TXREG is empty,
regardless of the state of TXIE enable bit.
All other EUSART control bits are assumed to be in
their default state.
To use interrupts when transmitting data, set the TXIE
bit only when there is more data to send. Clear the
TXIE interrupt enable bit upon writing the last character
of the transmission to the TXREG.
Setting the TXEN bit of the TXSTA register enables the
transmitter circuitry of the EUSART. Clearing the SYNC
bit of the TXSTA register configures the EUSART for
asynchronous operation. Setting the SPEN bit of the
RCSTA register enables the EUSART and
automatically configures the TX/CK I/O pin as an output.
If the TX/CK pin is shared with an analog peripheral, the
analog I/O function must be disabled by clearing the
corresponding ANSEL bit.
Note:
The TXIF Transmitter Interrupt flag is set
when the TXEN enable bit is set.
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22.1.1.5
TSR Status
22.1.1.7
Asynchronous Transmission Set-up:
The TRMT bit of the TXSTA register indicates the
status of the TSR register. This is a read-only bit. The
TRMT bit is set when the TSR register is empty and is
cleared when a character is transferred to the TSR
register from the TXREG. The TRMT bit remains clear
until all bits have been shifted out of the TSR register.
No interrupt logic is tied to this bit, so the user has to
poll this bit to determine the TSR status.
1. Initialize the SPBRGH, SPBRGL register pair and
the BRGH and BRG16 bits to achieve the desired
baud rate (see Section 22.4 “EUSART Baud
Rate Generator (BRG)”).
2. Enable the asynchronous serial port by clearing
the SYNC bit and setting the SPEN bit.
3. If 9-bit transmission is desired, set the TX9 con-
trol bit. A set ninth data bit will indicate that the
eight Least Significant data bits are an address
when the receiver is set for address detection.
Note:
The TSR register is not mapped in data
memory, so it is not available to the user.
4. Set SCKP bit if inverted transmit is desired.
22.1.1.6
Transmitting 9-Bit Characters
5. Enable the transmission by setting the TXEN
control bit. This will cause the TXIF interrupt bit
to be set.
The EUSART supports 9-bit character transmissions.
When the TX9 bit of the TXSTA register is set, the
EUSART will shift nine bits out for each character trans-
mitted. The TX9D bit of the TXSTA register is the ninth,
and Most Significant, data bit. When transmitting 9-bit
data, the TX9D data bit must be written before writing
the eight Least Significant bits into the TXREG. All nine
bits of data will be transferred to the TSR shift register
immediately after the TXREG is written.
6. If interrupts are desired, set the TXIE interrupt
enable bit of the PIE1 register. An interrupt will
occur immediately provided that the GIE and
PEIE bits of the INTCON register are also set.
7. If 9-bit transmission is selected, the ninth bit
should be loaded into the TX9D data bit.
8. Load 8-bit data into the TXREG register. This
will start the transmission.
A special 9-bit Address mode is available for use with
multiple receivers. See Section 22.1.2.7 “Address
Detection” for more information on the address mode.
FIGURE 22-3:
ASYNCHRONOUS TRANSMISSION
Write to TXREG
Word 1
BRG Output
(Shift Clock)
TX/CK
pin
Start bit
bit 0
bit 1
Word 1
bit 7/8
Stop bit
TXIF bit
(Transmit Buffer
Reg. Empty Flag)
1 TCY
Word 1
Transmit Shift Reg.
TRMT bit
(Transmit Shift
Reg. Empty Flag)
FIGURE 22-4:
ASYNCHRONOUS TRANSMISSION (BACK-TO-BACK)
Write to TXREG
Word 2
Start bit
Word 1
BRG Output
(Shift Clock)
TX/CK
pin
Start bit
Word 2
bit 0
bit 1
bit 7/8
bit 0
Stop bit
1 TCY
Word 1
TXIF bit
(Transmit Buffer
Reg. Empty Flag)
1 TCY
Word 1
Transmit Shift Reg.
TRMT bit
(Transmit Shift
Reg. Empty Flag)
Word 2
Transmit Shift Reg.
Note:
This timing diagram shows two consecutive transmissions.
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PIC16(L)F1508/9
TABLE 22-1: SUMMARY OF REGISTERS ASSOCIATED WITH ASYNCHRONOUS TRANSMISSION
Register
Name
Bit 7
Bit 6
Bit 5
Bit 4
Bit 3
Bit 2
Bit 1
Bit 0
on Page
BAUDCON
INTCON
PIE1
ABDOVF
GIE
RCIDL
PEIE
ADIE
ADIF
RX9
—
SCKP
INTE
TXIE
BRG16
IOCIE
—
TMR0IF
—
WUE
INTF
ABDEN
IOCIF
247
76
TMR0IE
RCIE
TMR1GIE
TMR1GIF
SPEN
SSP1IE
SSP1IF
ADDEN
TMR2IE TMR1IE
TMR2IF TMR1IF
77
PIR1
RCIF
TXIF
—
80
RCSTA
SPBRGL
SPBRGH
TRISB
SREN
CREN
FERR
OERR
RX9D
246*
248*
248*
116
237
245
BRG<7:0>
BRG<15:8>
TRISB6 TRISB5 TRISB4 TRISB3 TRISB2 TRISB1 TRISB0
TRISB7
TXREG
TXSTA
EUSART Transmit Data Register
CSRC TX9 TXEN
SYNC
SENDB
BRGH
TRMT
TX9D
Legend: — = unimplemented location, read as ‘0’. Shaded cells are not used for asynchronous transmission.
Page provides register information.
*
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PIC16(L)F1508/9
22.1.2
EUSART ASYNCHRONOUS
RECEIVER
22.1.2.2
Receiving Data
The receiver data recovery circuit initiates character
reception on the falling edge of the first bit. The first bit,
also known as the Start bit, is always a zero. The data
recovery circuit counts one-half bit time to the center of
the Start bit and verifies that the bit is still a zero. If it is
not a zero then the data recovery circuit aborts
character reception, without generating an error, and
resumes looking for the falling edge of the Start bit. If
the Start bit zero verification succeeds then the data
recovery circuit counts a full bit time to the center of the
next bit. The bit is then sampled by a majority detect
circuit and the resulting ‘0’ or ‘1’ is shifted into the RSR.
This repeats until all data bits have been sampled and
shifted into the RSR. One final bit time is measured and
the level sampled. This is the Stop bit, which is always
a ‘1’. If the data recovery circuit samples a ‘0’ in the
Stop bit position then a framing error is set for this
character, otherwise the framing error is cleared for this
character. See Section 22.1.2.4 “Receive Framing
Error” for more information on framing errors.
The Asynchronous mode is typically used in RS-232
systems. The receiver block diagram is shown in
Figure 22-2. The data is received on the RX/DT pin and
drives the data recovery block. The data recovery block
is actually a high-speed shifter operating at 16 times
the baud rate, whereas the serial Receive Shift
Register (RSR) operates at the bit rate. When all eight
or nine bits of the character have been shifted in, they
are immediately transferred to
a two character
First-In-First-Out (FIFO) memory. The FIFO buffering
allows reception of two complete characters and the
start of a third character before software must start
servicing the EUSART receiver. The FIFO and RSR
registers are not directly accessible by software.
Access to the received data is via the RCREG register.
22.1.2.1
Enabling the Receiver
The EUSART receiver is enabled for asynchronous
operation by configuring the following three control bits:
Immediately after all data bits and the Stop bit have
been received, the character in the RSR is transferred
to the EUSART receive FIFO and the RCIF interrupt
flag bit of the PIR1 register is set. The top character in
the FIFO is transferred out of the FIFO by reading the
RCREG register.
• CREN = 1
• SYNC = 0
• SPEN = 1
All other EUSART control bits are assumed to be in
their default state.
Setting the CREN bit of the RCSTA register enables the
receiver circuitry of the EUSART. Clearing the SYNC bit
of the TXSTA register configures the EUSART for
asynchronous operation. Setting the SPEN bit of the
RCSTA register enables the EUSART. The programmer
must set the corresponding TRIS bit to configure the
RX/DT I/O pin as an input.
Note:
If the receive FIFO is overrun, no additional
characters will be received until the overrun
condition is cleared. See Section 22.1.2.5
“Receive Overrun Error” for more
information on overrun errors.
22.1.2.3
Receive Interrupts
The RCIF interrupt flag bit of the PIR1 register is set
whenever the EUSART receiver is enabled and there is
an unread character in the receive FIFO. The RCIF
interrupt flag bit is read-only, it cannot be set or cleared
by software.
Note:
If the RX/DT function is on an analog pin,
the corresponding ANSEL bit must be
cleared for the receiver to function.
RCIF interrupts are enabled by setting all of the
following bits:
• RCIE, Interrupt Enable bit of the PIE1 register
• PEIE, Peripheral Interrupt Enable bit of the
INTCON register
• GIE, Global Interrupt Enable bit of the INTCON
register
The RCIF interrupt flag bit will be set when there is an
unread character in the FIFO, regardless of the state of
interrupt enable bits.
DS40001609B-page 240
2011-2013 Microchip Technology Inc.
PIC16(L)F1508/9
22.1.2.4
Receive Framing Error
22.1.2.7
Address Detection
Each character in the receive FIFO buffer has a
corresponding framing error Status bit. A framing error
indicates that a Stop bit was not seen at the expected
time. The framing error status is accessed via the
FERR bit of the RCSTA register. The FERR bit
represents the status of the top unread character in the
receive FIFO. Therefore, the FERR bit must be read
before reading the RCREG.
A special Address Detection mode is available for use
when multiple receivers share the same transmission
line, such as in RS-485 systems. Address detection is
enabled by setting the ADDEN bit of the RCSTA
register.
Address detection requires 9-bit character reception.
When address detection is enabled, only characters
with the ninth data bit set will be transferred to the
receive FIFO buffer, thereby setting the RCIF interrupt
bit. All other characters will be ignored.
The FERR bit is read-only and only applies to the top
unread character in the receive FIFO. A framing error
(FERR = 1) does not preclude reception of additional
characters. It is not necessary to clear the FERR bit.
Reading the next character from the FIFO buffer will
advance the FIFO to the next character and the next
corresponding framing error.
Upon receiving an address character, user software
determines if the address matches its own. Upon
address match, user software must disable address
detection by clearing the ADDEN bit before the next
Stop bit occurs. When user software detects the end of
the message, determined by the message protocol
used, software places the receiver back into the
Address Detection mode by setting the ADDEN bit.
The FERR bit can be forced clear by clearing the SPEN
bit of the RCSTA register which resets the EUSART.
Clearing the CREN bit of the RCSTA register does not
affect the FERR bit. A framing error by itself does not
generate an interrupt.
Note:
If all receive characters in the receive
FIFO have framing errors, repeated reads
of the RCREG will not clear the FERR bit.
22.1.2.5
Receive Overrun Error
The receive FIFO buffer can hold two characters. An
overrun error will be generated if a third character, in its
entirety, is received before the FIFO is accessed. When
this happens the OERR bit of the RCSTA register is
set. The characters already in the FIFO buffer can be
read but no additional characters will be received until
the error is cleared. The error must be cleared by either
clearing the CREN bit of the RCSTA register or by
resetting the EUSART by clearing the SPEN bit of the
RCSTA register.
22.1.2.6
Receiving 9-bit Characters
The EUSART supports 9-bit character reception. When
the RX9 bit of the RCSTA register is set the EUSART
will shift nine bits into the RSR for each character
received. The RX9D bit of the RCSTA register is the
ninth and Most Significant data bit of the top unread
character in the receive FIFO. When reading 9-bit data
from the receive FIFO buffer, the RX9D data bit must
be read before reading the eight Least Significant bits
from the RCREG.
2011-2013 Microchip Technology Inc.
DS40001609B-page 241
PIC16(L)F1508/9
22.1.2.8
Asynchronous Reception Set-up:
22.1.2.9
9-bit Address Detection Mode Set-up
1. Initialize the SPBRGH, SPBRGL register pair
and the BRGH and BRG16 bits to achieve the
desired baud rate (see Section 22.4 “EUSART
Baud Rate Generator (BRG)”).
This mode would typically be used in RS-485 systems.
To set up an Asynchronous Reception with Address
Detect Enable:
1. Initialize the SPBRGH, SPBRGL register pair
and the BRGH and BRG16 bits to achieve the
desired baud rate (see Section 22.4 “EUSART
Baud Rate Generator (BRG)”).
2. Clear the ANSEL bit for the RX pin (if applicable).
3. Enable the serial port by setting the SPEN bit.
The SYNC bit must be clear for asynchronous
operation.
2. Clear the ANSEL bit for the RX pin (if applicable).
4. If interrupts are desired, set the RCIE bit of the
PIE1 register and the GIE and PEIE bits of the
INTCON register.
3. Enable the serial port by setting the SPEN bit.
The SYNC bit must be clear for asynchronous
operation.
5. If 9-bit reception is desired, set the RX9 bit.
6. Enable reception by setting the CREN bit.
4. If interrupts are desired, set the RCIE bit of the
PIE1 register and the GIE and PEIE bits of the
INTCON register.
7. The RCIF interrupt flag bit will be set when a
character is transferred from the RSR to the
receive buffer. An interrupt will be generated if
the RCIE interrupt enable bit was also set.
5. Enable 9-bit reception by setting the RX9 bit.
6. Enable address detection by setting the ADDEN
bit.
8. Read the RCSTA register to get the error flags
and, if 9-bit data reception is enabled, the ninth
data bit.
7. Enable reception by setting the CREN bit.
8. The RCIF interrupt flag bit will be set when a
character with the ninth bit set is transferred
from the RSR to the receive buffer. An interrupt
will be generated if the RCIE interrupt enable bit
was also set.
9. Get the received eight Least Significant data bits
from the receive buffer by reading the RCREG
register.
10. If an overrun occurred, clear the OERR flag by
clearing the CREN receiver enable bit.
9. Read the RCSTA register to get the error flags.
The ninth data bit will always be set.
10. Get the received eight Least Significant data bits
from the receive buffer by reading the RCREG
register. Software determines if this is the
device’s address.
11. If an overrun occurred, clear the OERR flag by
clearing the CREN receiver enable bit.
12. If the device has been addressed, clear the
ADDEN bit to allow all received data into the
receive buffer and generate interrupts.
FIGURE 22-5:
ASYNCHRONOUS RECEPTION
Start
bit
Start
bit
Start
bit
RX/DT pin
bit 7/8
bit 7/8
bit 0 bit 1
Stop
bit
Stop
bit
Stop
bit
bit 0
bit 7/8
Rcv Shift
Reg
Rcv Buffer Reg.
Word 2
RCREG
Word 1
RCREG
RCIDL
Read Rcv
Buffer Reg.
RCREG
RCIF
(Interrupt Flag)
OERR bit
CREN
Note:
This timing diagram shows three words appearing on the RX input. The RCREG (receive buffer) is read after the third word,
causing the OERR (overrun) bit to be set.
DS40001609B-page 242
2011-2013 Microchip Technology Inc.
PIC16(L)F1508/9
TABLE 22-2: SUMMARY OF REGISTERS ASSOCIATED WITH ASYNCHRONOUS RECEPTION
Register
Name
Bit 7
Bit 6
Bit 5
Bit 4
Bit 3
Bit 2
Bit 1
Bit 0
on Page
BAUDCON
INTCON
PIE1
ABDOVF
GIE
RCIDL
PEIE
ADIE
ADIF
—
SCKP
INTE
TXIE
TXIF
BRG16
IOCIE
—
TMR0IF
—
WUE
INTF
ABDEN
IOCIF
247
76
TMR0IE
RCIE
TMR1GIE
TMR1GIF
SSP1IE
SSP1IF
TMR2IE TMR1IE
TMR2IF TMR1IF
77
PIR1
RCIF
—
80
RCREG
RCSTA
SPBRGL
SPBRGH
TRISB
EUSART Receive Data Register
SREN CREN ADDEN FERR
BRG<7:0>
BRG<15:8>
TRISB6 TRISB5 TRISB4 TRISB3 TRISB2 TRISB1 TRISB0
TX9 TXEN SYNC SENDB BRGH TRMT TX9D
240*
246*
248*
248*
116
245
SPEN
RX9
OERR
RX9D
TRISB7
CSRC
TXSTA
Legend: — = unimplemented location, read as ‘0’. Shaded cells are not used for asynchronous reception.
Page provides register information.
*
2011-2013 Microchip Technology Inc.
DS40001609B-page 243
PIC16(L)F1508/9
22.2 Clock Accuracy with
Asynchronous Operation
The factory calibrates the internal oscillator block out-
put (INTOSC). However, the INTOSC frequency may
drift as VDD or temperature changes, and this directly
affects the asynchronous baud rate.
The Auto-Baud Detect feature (see Section 22.4.1
“Auto-Baud Detect”) can be used to compensate for
changes in the INTOSC frequency.
There may not be fine enough resolution when
adjusting the Baud Rate Generator to compensate for
a gradual change in the peripheral clock frequency.
DS40001609B-page 244
2011-2013 Microchip Technology Inc.
PIC16(L)F1508/9
22.3 Register Definitions: EUSART Control
REGISTER 22-1: TXSTA: TRANSMIT STATUS AND CONTROL REGISTER
R/W-/0
CSRC
R/W-0/0
TX9
R/W-0/0
R/W-0/0
SYNC
R/W-0/0
SENDB
R/W-0/0
BRGH
R-1/1
R/W-0/0
TX9D
(1)
TXEN
TRMT
bit 7
bit 0
Legend:
R = Readable bit
W = Writable bit
U = Unimplemented bit, read as ‘0’
-n/n = Value at POR and BOR/Value at all other Resets
u = Bit is unchanged
‘1’ = Bit is set
x = Bit is unknown
‘0’ = Bit is cleared
bit 7
CSRC: Clock Source Select bit
Asynchronous mode:
Don’t care
Synchronous mode:
1= Master mode (clock generated internally from BRG)
0= Slave mode (clock from external source)
bit 6
bit 5
bit 4
bit 3
TX9: 9-bit Transmit Enable bit
1= Selects 9-bit transmission
0= Selects 8-bit transmission
(1)
TXEN: Transmit Enable bit
1= Transmit enabled
0= Transmit disabled
SYNC: EUSART Mode Select bit
1= Synchronous mode
0= Asynchronous mode
SENDB: Send Break Character bit
Asynchronous mode:
1= Send Sync Break on next transmission (cleared by hardware upon completion)
0= Sync Break transmission completed
Synchronous mode:
Don’t care
bit 2
BRGH: High Baud Rate Select bit
Asynchronous mode:
1= High speed
0= Low speed
Synchronous mode:
Unused in this mode
bit 1
bit 0
TRMT: Transmit Shift Register Status bit
1= TSR empty
0= TSR full
TX9D: Ninth bit of Transmit Data
Can be address/data bit or a parity bit.
Note 1: SREN/CREN overrides TXEN in Sync mode.
2011-2013 Microchip Technology Inc.
DS40001609B-page 245
PIC16(L)F1508/9
REGISTER 22-2: RCSTA: RECEIVE STATUS AND CONTROL REGISTER
R/W-0/0
SPEN
R/W-0/0
RX9
R/W-0/0
SREN
R/W-0/0
CREN
R/W-0/0
ADDEN
R-0/0
R-0/0
R-0/0
RX9D
FERR
OERR
bit 7
bit 0
Legend:
R = Readable bit
W = Writable bit
U = Unimplemented bit, read as ‘0’
-n/n = Value at POR and BOR/Value at all other Resets
u = Bit is unchanged
‘1’ = Bit is set
x = Bit is unknown
‘0’ = Bit is cleared
bit 7
bit 6
bit 5
SPEN: Serial Port Enable bit
1= Serial port enabled (configures RX/DT and TX/CK pins as serial port pins)
0= Serial port disabled (held in Reset)
RX9: 9-bit Receive Enable bit
1= Selects 9-bit reception
0= Selects 8-bit reception
SREN: Single Receive Enable bit
Asynchronous mode:
Don’t care
Synchronous mode – Master:
1= Enables single receive
0= Disables single receive
This bit is cleared after reception is complete.
Synchronous mode – Slave
Don’t care
bit 4
CREN: Continuous Receive Enable bit
Asynchronous mode:
1= Enables receiver
0= Disables receiver
Synchronous mode:
1= Enables continuous receive until enable bit CREN is cleared (CREN overrides SREN)
0= Disables continuous receive
bit 3
ADDEN: Address Detect Enable bit
Asynchronous mode 9-bit (RX9 = 1):
1= Enables address detection, enable interrupt and load the receive buffer when RSR<8> is set
0= Disables address detection, all bytes are received and ninth bit can be used as parity bit
Asynchronous mode 8-bit (RX9 = 0):
Don’t care
bit 2
bit 1
bit 0
FERR: Framing Error bit
1= Framing error (can be updated by reading RCREG register and receive next valid byte)
0= No framing error
OERR: Overrun Error bit
1= Overrun error (can be cleared by clearing bit CREN)
0= No overrun error
RX9D: Ninth bit of Received Data
This can be address/data bit or a parity bit and must be calculated by user firmware.
DS40001609B-page 246
2011-2013 Microchip Technology Inc.
PIC16(L)F1508/9
REGISTER 22-3: BAUDCON: BAUD RATE CONTROL REGISTER
R-0/0
R-1/1
U-0
—
R/W-0/0
SCKP
R/W-0/0
BRG16
U-0
—
R/W-0/0
WUE
R/W-0/0
ABDEN
ABDOVF
RCIDL
bit 7
bit 0
Legend:
R = Readable bit
W = Writable bit
U = Unimplemented bit, read as ‘0’
-n/n = Value at POR and BOR/Value at all other Resets
u = Bit is unchanged
‘1’ = Bit is set
x = Bit is unknown
‘0’ = Bit is cleared
bit 7
bit 6
ABDOVF: Auto-Baud Detect Overflow bit
Asynchronous mode:
1= Auto-baud timer overflowed
0= Auto-baud timer did not overflow
Synchronous mode:
Don’t care
RCIDL: Receive Idle Flag bit
Asynchronous mode:
1= Receiver is idle
0= Start bit has been received and the receiver is receiving
Synchronous mode:
Don’t care
bit 5
bit 4
Unimplemented: Read as ‘0’
SCKP: Synchronous Clock Polarity Select bit
Asynchronous mode:
1= Transmit inverted data to the TX/CK pin
0= Transmit non-inverted data to the TX/CK pin
Synchronous mode:
1= Data is clocked on rising edge of the clock
0= Data is clocked on falling edge of the clock
bit 3
BRG16: 16-bit Baud Rate Generator bit
1= 16-bit Baud Rate Generator is used
0= 8-bit Baud Rate Generator is used
bit 2
bit 1
Unimplemented: Read as ‘0’
WUE: Wake-up Enable bit
Asynchronous mode:
1= Receiver is waiting for a falling edge. No character will be received, RCIF bit will be set. WUE will
automatically clear after RCIF is set.
0= Receiver is operating normally
Synchronous mode:
Don’t care
bit 0
ABDEN: Auto-Baud Detect Enable bit
Asynchronous mode:
1= Auto-Baud Detect mode is enabled (clears when auto-baud is complete)
0= Auto-Baud Detect mode is disabled
Synchronous mode:
Don’t care
2011-2013 Microchip Technology Inc.
DS40001609B-page 247
PIC16(L)F1508/9
EXAMPLE 22-1:
CALCULATING BAUD
RATE ERROR
22.4 EUSART Baud Rate Generator
(BRG)
For a device with FOSC of 16 MHz, desired baud rate
of 9600, Asynchronous mode, 8-bit BRG:
The Baud Rate Generator (BRG) is an 8-bit or 16-bit
timer that is dedicated to the support of both the
asynchronous and synchronous EUSART operation.
By default, the BRG operates in 8-bit mode. Setting the
BRG16 bit of the BAUDCON register selects 16-bit
mode.
FOSC
Desired Baud Rate = -----------------------------------------------------------------------
64[SPBRGH:SPBRGL] + 1
Solving for SPBRGH:SPBRGL:
FOSC
---------------------------------------------
Desired Baud Rate
X = --------------------------------------------- – 1
64
The SPBRGH, SPBRGL register pair determines the
period of the free running baud rate timer. In
Asynchronous mode the multiplier of the baud rate
period is determined by both the BRGH bit of the TXSTA
register and the BRG16 bit of the BAUDCON register. In
Synchronous mode, the BRGH bit is ignored.
16000000
-----------------------
9600
= ----------------------- – 1
64
= 25.042 = 25
Table 22-3 contains the formulas for determining the
baud rate. Example 22-1 provides a sample calculation
for determining the baud rate and baud rate error.
16000000
Calculated Baud Rate = --------------------------
6425 + 1
Typical baud rates and error values for various
asynchronous modes have been computed for your
convenience and are shown in Table 22-3. It may be
advantageous to use the high baud rate (BRGH = 1),
or the 16-bit BRG (BRG16 = 1) to reduce the baud rate
error. The 16-bit BRG mode is used to achieve slow
baud rates for fast oscillator frequencies.
= 9615
Calc. Baud Rate – Desired Baud Rate
Error = --------------------------------------------------------------------------------------------
Desired Baud Rate
9615 – 9600
= ---------------------------------- = 0 . 1 6 %
9600
Writing a new value to the SPBRGH, SPBRGL register
pair causes the BRG timer to be reset (or cleared). This
ensures that the BRG does not wait for a timer overflow
before outputting the new baud rate.
If the system clock is changed during an active receive
operation, a receive error or data loss may result. To
avoid this problem, check the status of the RCIDL bit to
make sure that the receive operation is idle before
changing the system clock.
DS40001609B-page 248
2011-2013 Microchip Technology Inc.
PIC16(L)F1508/9
TABLE 22-3: BAUD RATE FORMULAS
Configuration Bits
Baud Rate Formula
BRG/EUSART Mode
SYNC
BRG16
BRGH
0
0
0
0
1
1
0
0
1
1
0
1
0
1
0
1
x
x
8-bit/Asynchronous
8-bit/Asynchronous
16-bit/Asynchronous
16-bit/Asynchronous
8-bit/Synchronous
16-bit/Synchronous
FOSC/[64 (n+1)]
FOSC/[16 (n+1)]
FOSC/[4 (n+1)]
Legend:
x= Don’t care, n = value of SPBRGH, SPBRGL register pair.
TABLE 22-4: SUMMARY OF REGISTERS ASSOCIATED WITH THE BAUD RATE GENERATOR
Register
on Page
Name
Bit 7
Bit 6
Bit 5
Bit 4
Bit 3
Bit 2
Bit 1
Bit 0
BAUDCON
RCSTA
ABDOVF RCIDL
—
SCKP
CREN
BRG16
ADDEN
—
WUE
ABDEN
RX9D
247
246
SPEN
CSRC
RX9
SREN
FERR
OERR
SPBRGL
SPBRGH
TXSTA
BRG<7:0>
BRG<15:8>
SYNC SENDB
248*
248*
245
TX9
TXEN
BRGH
TRMT
TX9D
Legend: — = unimplemented location, read as ‘0’. Shaded cells are not used for the Baud Rate Generator.
Page provides register information.
*
2011-2013 Microchip Technology Inc.
DS40001609B-page 249
PIC16(L)F1508/9
TABLE 22-5: BAUD RATES FOR ASYNCHRONOUS MODES
SYNC = 0, BRGH = 0, BRG16 = 0
FOSC = 20.000 MHz
FOSC = 18.432 MHz
FOSC = 16.000 MHz
FOSC = 11.0592 MHz
BAUD
RATE
SPBRG
SPBRG
SPBRG
SPBRG
Actual
Rate
%
Actual
Rate
%
Actual
Rate
%
Actual
Rate
%
value
(decimal)
value
(decimal)
value
(decimal)
value
(decimal)
Error
Error
Error
Error
300
1200
—
—
—
255
129
32
—
—
—
239
119
29
—
—
—
207
103
25
—
—
—
143
71
17
16
8
1221
2404
9470
10417
19.53k
1.73
0.16
-1.36
0.00
1.73
1200
2400
9600
10286
19.20k
0.00
0.00
0.00
-1.26
0.00
0.00
—
1202
2404
9615
10417
19.23k
0.16
0.16
0.16
0.00
0.16
—
1200
2400
9600
10165
19.20k
0.00
0.00
0.00
-2.42
0.00
0.00
—
2400
9600
10417
19.2k
57.6k
115.2k
29
27
23
15
14
12
2
—
—
—
—
—
—
57.60k
—
7
—
—
—
—
57.60k
—
—
—
—
SYNC = 0, BRGH = 0, BRG16 = 0
FOSC = 4.000 MHz FOSC = 3.6864 MHz
FOSC = 8.000 MHz
FOSC = 1.000 MHz
BAUD
RATE
SPBRG
SPBRG
value
SPBRG
value
SPBRG
Actual
Rate
%
Actual
Rate
%
Error
Actual
Rate
%
Error
Actual
Rate
%
value
(decimal)
value
(decimal)
Error
Error
(decimal)
(decimal)
0.00
0.00
0.00
0.00
—
300
1200
—
1202
2404
9615
10417
—
—
0.16
0.16
0.16
0.00
—
—
103
51
12
11
300
1202
2404
—
0.16
0.16
0.16
—
207
51
25
—
5
300
1200
2400
9600
—
191
47
23
5
300
1202
—
0.16
0.16
—
51
12
—
—
—
—
—
—
2400
9600
—
—
10417
19.2k
57.6k
115.2k
10417
—
0.00
—
—
2
—
—
—
—
—
—
19.20k
0.00
0.00
—
—
—
—
—
—
—
—
0
—
—
57.60k
—
—
—
—
—
—
—
—
—
SYNC = 0, BRGH = 1, BRG16 = 0
FOSC = 18.432 MHz FOSC = 16.000 MHz
FOSC = 20.000 MHz
FOSC = 11.0592 MHz
BAUD
RATE
SPBRG
SPBRG
value
SPBRG
value
SPBRG
Actual
Rate
%
Actual
Rate
%
Error
Actual
Rate
%
Error
Actual
Rate
%
value
(decimal)
value
(decimal)
Error
Error
(decimal)
(decimal)
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
300
1200
2400
9600
10417
19.2k
57.6k
—
—
—
—
—
—
—
—
—
—
—
—
—
—
71
65
35
11
5
9615
10417
19.23k
56.82k
0.16
0.00
0.16
-1.36
129
119
64
9600
10378
19.20k
57.60k
115.2k
0.00
-0.37
0.00
0.00
0.00
119
110
59
19
9
9615
10417
19.23k
58.82k
111.1k
0.16
0.00
0.16
2.12
-3.55
103
95
51
16
8
9600
0.00
0.53
0.00
0.00
0.00
10473
19.20k
57.60k
115.2k
21
115.2k 113.64k -1.36
10
DS40001609B-page 250
2011-2013 Microchip Technology Inc.
PIC16(L)F1508/9
TABLE 22-5: BAUD RATES FOR ASYNCHRONOUS MODES (CONTINUED)
SYNC = 0, BRGH = 1, BRG16 = 0
FOSC = 4.000 MHz FOSC = 3.6864 MHz
FOSC = 8.000 MHz
FOSC = 1.000 MHz
BAUD
RATE
SPBRG
SPBRG
value
SPBRG
value
SPBRG
Actual
Rate
%
Actual
Rate
%
Error
Actual
Rate
%
Error
Actual
Rate
%
value
(decimal)
value
(decimal)
Error
Error
(decimal)
(decimal)
—
—
—
—
—
—
300
1200
—
1202
2404
9615
10417
19.23k
—
—
—
207
103
25
—
—
—
191
95
23
21
11
3
300
1202
2404
—
0.16
0.16
0.16
—
207
51
25
—
5
0.16
0.16
0.16
0.00
0.16
—
1200
0.00
0.00
0.00
0.53
0.00
0.00
0.00
2400
2404
9615
10417
19231
55556
—
0.16
0.16
0.00
0.16
-3.55
—
207
51
47
25
8
2400
9600
9600
10417
19.2k
57.6k
115.2k
23
10473
19.2k
57.60k
115.2k
10417
—
0.00
—
12
—
—
—
—
—
—
—
—
—
—
1
—
—
SYNC = 0, BRGH = 0, BRG16 = 1
FOSC = 18.432 MHz FOSC = 16.000 MHz
FOSC = 20.000 MHz
FOSC = 11.0592 MHz
BAUD
RATE
SPBRG
SPBRG
value
SPBRG
value
SPBRG
Actual
Rate
%
Actual
Rate
%
Error
Actual
Rate
%
Error
Actual
Rate
%
value
(decimal)
value
(decimal)
Error
Error
(decimal)
(decimal)
300
1200
2400
9600
10417
19.2k
57.6k
300.0
1200
-0.01
-0.03
-0.03
0.16
0.00
0.16
-1.36
4166
1041
520
129
119
64
300.0
1200
0.00
0.00
0.00
0.00
-0.37
0.00
0.00
0.00
3839
959
479
119
110
59
300.03
1200.5
2398
0.01
0.04
-0.08
0.16
0.00
0.16
2.12
3332
832
416
103
95
300.0
1200
0.00
0.00
0.00
0.00
0.53
0.00
0.00
0.00
2303
575
287
71
2399
2400
2400
9615
9600
9615
9600
10417
19.23k
56.818
10378
19.20k
57.60k
115.2k
10417
19.23k
58.82k
10473
19.20k
57.60k
115.2k
65
51
35
21
19
16
11
115.2k 113.636 -1.36
10
9
111.11k -3.55
8
5
SYNC = 0, BRGH = 0, BRG16 = 1
FOSC = 4.000 MHz FOSC = 3.6864 MHz
FOSC = 8.000 MHz
FOSC = 1.000 MHz
BAUD
RATE
SPBRG
value
SPBRG
value
SPBRG
value
SPBRG
Actual
Rate
%
Error
Actual
Rate
%
Error
Actual
Rate
%
Error
Actual
Rate
%
value
(decimal)
Error
(decimal)
(decimal)
(decimal)
300
1200
299.9
1199
-0.02
-0.08
0.16
0.16
0.00
0.16
-3.55
—
1666
416
207
51
300.1
1202
2404
9615
10417
19.23k
—
0.04
0.16
0.16
0.16
0.00
0.16
—
832
207
103
25
300.0
1200
0.00
0.00
0.00
0.00
0.53
0.00
0.00
0.00
767
191
95
23
21
11
3
300.5
1202
2404
—
0.16
0.16
0.16
—
207
51
25
—
5
2400
2404
9615
10417
19.23k
55556
—
2400
9600
9600
10417
19.2k
57.6k
115.2k
47
23
10473
19.20k
57.60k
115.2k
10417
—
0.00
—
25
12
—
—
—
8
—
—
—
—
—
—
—
1
—
—
2011-2013 Microchip Technology Inc.
DS40001609B-page 251
PIC16(L)F1508/9
TABLE 22-5: BAUD RATES FOR ASYNCHRONOUS MODES (CONTINUED)
SYNC = 0, BRGH = 1, BRG16 = 1or SYNC = 1, BRG16 = 1
FOSC = 20.000 MHz
FOSC = 18.432 MHz
FOSC = 16.000 MHz
FOSC = 11.0592 MHz
BAUD
RATE
SPBRG
SPBRG
SPBRG
SPBRG
Actual
Rate
%
Actual
Rate
%
Actual
Rate
%
Actual
Rate
%
value
(decimal)
value
(decimal)
value
(decimal)
value
(decimal)
Error
Error
Error
Error
300
1200
300.0
1200
0.00
-0.01
0.02
-0.03
0.00
0.16
-0.22
0.94
16665
4166
2082
520
479
259
86
300.0
1200
0.00
0.00
0.00
0.00
0.08
0.00
0.00
0.00
15359
3839
1919
479
441
239
79
300.0
1200.1
2399.5
9592
0.00
0.01
-0.02
-0.08
0.00
0.16
0.64
13332
3332
1666
416
383
207
68
300.0
1200
0.00
0.00
0.00
0.00
0.16
0.00
0.00
0.00
9215
2303
1151
287
264
143
47
2400
2400
2400
2400
9600
9597
9600
9600
10417
19.2k
57.6k
115.2k
10417
19.23k
57.47k
116.3k
10425
19.20k
57.60k
115.2k
10417
19.23k
57.97k
10433
19.20k
57.60k
115.2k
42
39
114.29k -0.79
34
23
SYNC = 0, BRGH = 1, BRG16 = 1or SYNC = 1, BRG16 = 1
FOSC = 4.000 MHz FOSC = 3.6864 MHz
FOSC = 8.000 MHz
FOSC = 1.000 MHz
BAUD
RATE
SPBRG
SPBRG
SPBRG
SPBRG
Actual
Rate
%
Actual
Rate
%
Actual
Rate
%
Actual
Rate
%
value
(decimal)
value
(decimal)
value
(decimal)
value
(decimal)
Error
Error
Error
Error
300
1200
300.0
1200
0.00
-0.02
0.04
0.16
0
6666
1666
832
207
191
103
34
300.0
1200
0.01
0.04
0.08
0.16
0.00
0.16
2.12
-3.55
3332
832
416
103
95
300.0
1200
0.00
0.00
0.00
0.00
0.53
0.00
0.00
0.00
3071
767
383
95
300.1
1202
2404
9615
10417
19.23k
—
0.04
0.16
0.16
0.16
0.00
0.16
—
832
207
103
25
2400
2401
2398
2400
9600
9615
9615
9600
10417
19.2k
57.6k
115.2k
10417
19.23k
57.14k
117.6k
10417
19.23k
58.82k
111.1k
10473
19.20k
57.60k
115.2k
87
23
0.16
-0.79
2.12
51
47
12
16
15
—
16
8
7
—
—
—
DS40001609B-page 252
2011-2013 Microchip Technology Inc.
PIC16(L)F1508/9
and SPBRGL registers are clocked at 1/8th the BRG
base clock rate. The resulting byte measurement is the
average bit time when clocked at full speed.
22.4.1
AUTO-BAUD DETECT
The EUSART module supports automatic detection
and calibration of the baud rate.
Note 1: If the WUE bit is set with the ABDEN bit,
auto-baud detection will occur on the byte
following the Break character (see
Section 22.4.3 “Auto-Wake-up on
Break”).
In the Auto-Baud Detect (ABD) mode, the clock to the
BRG is reversed. Rather than the BRG clocking the
incoming RX signal, the RX signal is timing the BRG.
The Baud Rate Generator is used to time the period of
a received 55h (ASCII “U”) which is the Sync character
for the LIN bus. The unique feature of this character is
that it has five rising edges including the Stop bit edge.
2: It is up to the user to determine that the
incoming character baud rate is within the
range of the selected BRG clock source.
Some combinations of oscillator frequency
and EUSART baud rates are not possible.
Setting the ABDEN bit of the BAUDCON register starts
the auto-baud calibration sequence (Figure 22-6).
While the ABD sequence takes place, the EUSART
state machine is held in Idle. On the first rising edge of
the receive line, after the Start bit, the SPBRG begins
counting up using the BRG counter clock as shown in
Table 22-6. The fifth rising edge will occur on the RX pin
at the end of the eighth bit period. At that time, an
accumulated value totaling the proper BRG period is
left in the SPBRGH, SPBRGL register pair, the ABDEN
bit is automatically cleared and the RCIF interrupt flag
is set. The value in the RCREG needs to be read to
clear the RCIF interrupt. RCREG content should be
discarded. When calibrating for modes that do not use
the SPBRGH register the user can verify that the
SPBRGL register did not overflow by checking for 00h
in the SPBRGH register.
3: During the auto-baud process, the
auto-baud counter starts counting at 1.
Upon completion of the auto-baud
sequence, to achieve maximum accuracy,
subtract 1 from the SPBRGH:SPBRGL
register pair.
TABLE 22-6:
BRG COUNTER CLOCK RATES
BRG Base
Clock
BRG ABD
Clock
BRG16 BRGH
0
0
0
1
FOSC/64
FOSC/16
FOSC/512
FOSC/128
1
1
0
1
FOSC/16
FOSC/4
FOSC/128
FOSC/32
The BRG auto-baud clock is determined by the BRG16
and BRGH bits as shown in Table 22-6. During ABD,
both the SPBRGH and SPBRGL registers are used as
a 16-bit counter, independent of the BRG16 bit setting.
While calibrating the baud rate period, the SPBRGH
Note:
During the ABD sequence, SPBRGL and
SPBRGH registers are both used as a 16-bit
counter, independent of BRG16 setting.
FIGURE 22-6:
AUTOMATIC BAUD RATE CALIBRATION
XXXXh
0000h
001Ch
BRG Value
Edge #1
bit 1
Edge #2
bit 3
Edge #3
bit 5
Edge #4
bit 7
bit 6
Edge #5
Stop bit
RX pin
Start
bit 0
bit 2
bit 4
BRG Clock
Auto Cleared
Set by User
ABDEN bit
RCIDL
RCIF bit
(Interrupt)
Read
RCREG
XXh
XXh
1Ch
00h
SPBRGL
SPBRGH
Note 1: The ABD sequence requires the EUSART module to be configured in Asynchronous mode.
2011-2013 Microchip Technology Inc.
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PIC16(L)F1508/9
22.4.2
AUTO-BAUD OVERFLOW
22.4.3.1
Special Considerations
During the course of automatic baud detection, the
ABDOVF bit of the BAUDCON register will be set if the
baud rate counter overflows before the fifth rising edge
is detected on the RX pin. The ABDOVF bit indicates
that the counter has exceeded the maximum count that
can fit in the 16 bits of the SPBRGH:SPBRGL register
pair. After the ABDOVF bit has been set, the counter
continues to count until the fifth rising edge is detected
on the RX pin. Upon detecting the fifth RX edge, the
hardware will set the RCIF interrupt flag and clear the
ABDEN bit of the BAUDCON register. The RCIF flag
can be subsequently cleared by reading the RCREG
register. The ABDOVF flag of the BAUDCON register
can be cleared by software directly.
Break Character
To avoid character errors or character fragments
during a wake-up event, the wake-up character must
be all zeros.
When the wake-up is enabled the function works
independent of the low time on the data stream. If the
WUE bit is set and a valid non-zero character is
received, the low time from the Start bit to the first rising
edge will be interpreted as the wake-up event. The
remaining bits in the character will be received as a
fragmented character and subsequent characters can
result in framing or overrun errors.
Therefore, the initial character in the transmission must
be all ‘0’s. This must be ten or more bit times, 13-bit
times recommended for LIN bus, or any number of bit
times for standard RS-232 devices.
To terminate the auto-baud process before the RCIF
flag is set, clear the ABDEN bit then clear the ABDOVF
bit of the BAUDCON register. The ABDOVF bit will
remain set if the ABDEN bit is not cleared first.
Oscillator Start-up Time
Oscillator start-up time must be considered, especially
in applications using oscillators with longer start-up
intervals (i.e., LP, XT or HS/PLL mode). The Sync
Break (or wake-up signal) character must be of
sufficient length, and be followed by a sufficient
interval, to allow enough time for the selected oscillator
to start and provide proper initialization of the EUSART.
22.4.3
AUTO-WAKE-UP ON BREAK
During Sleep mode, all clocks to the EUSART are
suspended. Because of this, the Baud Rate Generator
is inactive and a proper character reception cannot be
performed. The Auto-Wake-up feature allows the
controller to wake-up due to activity on the RX/DT line.
This feature is available only in Asynchronous mode.
WUE Bit
The Auto-Wake-up feature is enabled by setting the
WUE bit of the BAUDCON register. Once set, the normal
receive sequence on RX/DT is disabled, and the
EUSART remains in an Idle state, monitoring for a
wake-up event independent of the CPU mode. A
wake-up event consists of a high-to-low transition on the
RX/DT line. (This coincides with the start of a Sync Break
or a wake-up signal character for the LIN protocol.)
The wake-up event causes a receive interrupt by
setting the RCIF bit. The WUE bit is cleared in
hardware by a rising edge on RX/DT. The interrupt
condition is then cleared in software by reading the
RCREG register and discarding its contents.
To ensure that no actual data is lost, check the RCIDL
bit to verify that a receive operation is not in process
before setting the WUE bit. If a receive operation is not
occurring, the WUE bit may then be set just prior to
entering the Sleep mode.
The EUSART module generates an RCIF interrupt
coincident with the wake-up event. The interrupt is
generated synchronously to the Q clocks in normal CPU
operating modes (Figure 22-7), and asynchronously if
the device is in Sleep mode (Figure 22-8). The interrupt
condition is cleared by reading the RCREG register.
The WUE bit is automatically cleared by the low-to-high
transition on the RX line at the end of the Break. This
signals to the user that the Break event is over. At this
point, the EUSART module is in Idle mode waiting to
receive the next character.
DS40001609B-page 254
2011-2013 Microchip Technology Inc.
PIC16(L)F1508/9
FIGURE 22-7:
AUTO-WAKE-UP BIT (WUE) TIMING DURING NORMAL OPERATION
Q1 Q2 Q3 Q4 Q1 Q2 Q3Q4 Q1Q2 Q3 Q4 Q1Q2 Q3 Q4 Q1Q2 Q3 Q4 Q1Q2 Q3 Q4 Q1Q2 Q3 Q4 Q1Q2 Q3Q4 Q1 Q2 Q3 Q4 Q1Q2 Q3Q4
OSC1
Auto Cleared
Bit set by user
WUE bit
RX/DT Line
RCIF
Cleared due to User Read of RCREG
Note 1: The EUSART remains in Idle while the WUE bit is set.
FIGURE 22-8:
AUTO-WAKE-UP BIT (WUE) TIMINGS DURING SLEEP
Q4
Q1Q2Q3 Q4 Q1Q2 Q3Q4 Q1Q2Q3
Q1
Q2 Q3Q4 Q1Q2Q3 Q4 Q1Q2Q3Q4 Q1Q2Q3 Q4 Q1Q2 Q3Q4
Auto Cleared
OSC1
Bit Set by User
WUE bit
RX/DT Line
Note 1
RCIF
Cleared due to User Read of RCREG
Sleep Command Executed
Sleep Ends
Note 1: If the wake-up event requires long oscillator warm-up time, the automatic clearing of the WUE bit can occur while the stposcsignal is
still active. This sequence should not depend on the presence of Q clocks.
2: The EUSART remains in Idle while the WUE bit is set.
2011-2013 Microchip Technology Inc.
DS40001609B-page 255
PIC16(L)F1508/9
22.4.4
BREAK CHARACTER SEQUENCE
22.4.5
RECEIVING A BREAK CHARACTER
The EUSART module has the capability of sending the
special Break character sequences that are required by
the LIN bus standard. A Break character consists of a
Start bit, followed by 12 ‘0’ bits and a Stop bit.
The Enhanced EUSART module can receive a Break
character in two ways.
The first method to detect a Break character uses the
FERR bit of the RCSTA register and the received data
as indicated by RCREG. The Baud Rate Generator is
assumed to have been initialized to the expected baud
rate.
To send a Break character, set the SENDB and TXEN
bits of the TXSTA register. The Break character trans-
mission is then initiated by a write to the TXREG. The
value of data written to TXREG will be ignored and all
‘0’s will be transmitted.
A Break character has been received when;
• RCIF bit is set
• FERR bit is set
• RCREG = 00h
The SENDB bit is automatically reset by hardware after
the corresponding Stop bit is sent. This allows the user
to preload the transmit FIFO with the next transmit byte
following the Break character (typically, the Sync
character in the LIN specification).
The second method uses the Auto-Wake-up feature
described in Section 22.4.3 “Auto-Wake-up on
Break”. By enabling this feature, the EUSART will
sample the next two transitions on RX/DT, cause an
RCIF interrupt, and receive the next data byte followed
by another interrupt.
The TRMT bit of the TXSTA register indicates when the
transmit operation is active or idle, just as it does during
normal transmission. See Figure 22-9 for the timing of
the Break character sequence.
Note that following a Break character, the user will
typically want to enable the Auto-Baud Detect feature.
For both methods, the user can set the ABDEN bit of
the BAUDCON register before placing the EUSART in
Sleep mode.
22.4.4.1
Break and Sync Transmit Sequence
The following sequence will start a message frame
header made up of a Break, followed by an auto-baud
Sync byte. This sequence is typical of a LIN bus
master.
1. Configure the EUSART for the desired mode.
2. Set the TXEN and SENDB bits to enable the
Break sequence.
3. Load the TXREG with a dummy character to
initiate transmission (the value is ignored).
4. Write ‘55h’ to TXREG to load the Sync character
into the transmit FIFO buffer.
5. After the Break has been sent, the SENDB bit is
reset by hardware and the Sync character is
then transmitted.
When the TXREG becomes empty, as indicated by the
TXIF, the next data byte can be written to TXREG.
FIGURE 22-9:
SEND BREAK CHARACTER SEQUENCE
Write to TXREG
Dummy Write
BRG Output
(Shift Clock)
TX (pin)
Start bit
bit 0
bit 1
Break
bit 11
Stop bit
TXIF bit
(Transmit
Interrupt Flag)
TRMT bit
(Transmit Shift
Empty Flag)
SENDB Sampled Here
Auto Cleared
SENDB
(send Break
control bit)
DS40001609B-page 256
2011-2013 Microchip Technology Inc.
PIC16(L)F1508/9
Clearing the SCKP bit sets the Idle state as low. When
the SCKP bit is cleared, the data changes on the rising
edge of each clock.
22.5 EUSART Synchronous Mode
Synchronous serial communications are typically used
in systems with a single master and one or more
slaves. The master device contains the necessary cir-
cuitry for baud rate generation and supplies the clock
for all devices in the system. Slave devices can take
advantage of the master clock by eliminating the inter-
nal clock generation circuitry.
22.5.1.3
Synchronous Master Transmission
Data is transferred out of the device on the RX/DT pin.
The RX/DT and TX/CK pin output drivers are automat-
ically enabled when the EUSART is configured for syn-
chronous master transmit operation.
There are two signal lines in Synchronous mode: a bidi-
rectional data line and a clock line. Slaves use the
external clock supplied by the master to shift the serial
data into and out of their respective receive and trans-
mit shift registers. Since the data line is bidirectional,
synchronous operation is half-duplex only. Half-duplex
refers to the fact that master and slave devices can
receive and transmit data but not both simultaneously.
The EUSART can operate as either a master or slave
device.
A transmission is initiated by writing a character to the
TXREG register. If the TSR still contains all or part of a
previous character the new character data is held in the
TXREG until the last bit of the previous character has
been transmitted. If this is the first character, or the pre-
vious character has been completely flushed from the
TSR, the data in the TXREG is immediately transferred
to the TSR. The transmission of the character com-
mences immediately following the transfer of the data
to the TSR from the TXREG.
Start and Stop bits are not used in synchronous trans-
missions.
Each data bit changes on the leading edge of the mas-
ter clock and remains valid until the subsequent leading
clock edge.
22.5.1
SYNCHRONOUS MASTER MODE
Note:
The TSR register is not mapped in data
memory, so it is not available to the user.
The following bits are used to configure the EUSART
for synchronous master operation:
• SYNC = 1
22.5.1.4
Synchronous Master Transmission
Set-up:
• CSRC = 1
• SREN = 0(for transmit); SREN = 1(for receive)
• CREN = 0(for transmit); CREN = 1(for receive)
• SPEN = 1
1. Initialize the SPBRGH, SPBRGL register pair
and the BRGH and BRG16 bits to achieve the
desired baud rate (see Section 22.4 “EUSART
Baud Rate Generator (BRG)”).
Setting the SYNC bit of the TXSTA register configures
the device for synchronous operation. Setting the CSRC
bit of the TXSTA register configures the device as a
master. Clearing the SREN and CREN bits of the RCSTA
register ensures that the device is in the Transmit mode,
otherwise the device will be configured to receive. Setting
the SPEN bit of the RCSTA register enables the
EUSART.
2. Enable the synchronous master serial port by
setting bits SYNC, SPEN and CSRC.
3. Disable Receive mode by clearing bits SREN
and CREN.
4. Enable Transmit mode by setting the TXEN bit.
5. If 9-bit transmission is desired, set the TX9 bit.
6. If interrupts are desired, set the TXIE bit of the
PIE1 register and the GIE and PEIE bits of the
INTCON register.
22.5.1.1
Master Clock
Synchronous data transfers use a separate clock line,
which is synchronous with the data. A device config-
ured as a master transmits the clock on the TX/CK line.
The TX/CK pin output driver is automatically enabled
when the EUSART is configured for synchronous
transmit or receive operation. Serial data bits change
on the leading edge to ensure they are valid at the trail-
ing edge of each clock. One clock cycle is generated
for each data bit. Only as many clock cycles are gener-
ated as there are data bits.
7. If 9-bit transmission is selected, the ninth bit
should be loaded in the TX9D bit.
8. Start transmission by loading data to the
TXREG register.
22.5.1.2
Clock Polarity
A clock polarity option is provided for Microwire
compatibility. Clock polarity is selected with the SCKP
bit of the BAUDCON register. Setting the SCKP bit sets
the clock Idle state as high. When the SCKP bit is set,
the data changes on the falling edge of each clock.
2011-2013 Microchip Technology Inc.
DS40001609B-page 257
PIC16(L)F1508/9
FIGURE 22-10:
SYNCHRONOUS TRANSMISSION
RX/DT
pin
bit 0
bit 1
bit 2
bit 7
bit 0
bit 1
Word 2
bit 7
Word 1
TX/CK pin
(SCKP = 0)
TX/CK pin
(SCKP = 1)
Write to
TXREG Reg
Write Word 1
Write Word 2
TXIF bit
(Interrupt Flag)
TRMT bit
‘1’
‘1’
TXEN bit
Note:
Sync Master mode, SPBRGL = 0, continuous transmission of two 8-bit words.
FIGURE 22-11:
SYNCHRONOUS TRANSMISSION (THROUGH TXEN)
RX/DT pin
bit 0
bit 2
bit 1
bit 6
bit 7
TX/CK pin
Write to
TXREG reg
TXIF bit
TRMT bit
TXEN bit
TABLE 22-7: SUMMARY OF REGISTERS ASSOCIATED WITH SYNCHRONOUS MASTER
TRANSMISSION
Register
on Page
Name
Bit 7
Bit 6
Bit 5
Bit 4
Bit 3
Bit 2
Bit 1
Bit 0
BAUDCON
INTCON
PIE1
ABDOVF
GIE
RCIDL
PEIE
ADIE
ADIF
RX9
—
SCKP
INTE
TXIE
BRG16
IOCIE
—
TMR0IF
—
WUE
INTF
ABDEN
IOCIF
247
76
TMR0IE
RCIE
TMR1GIE
TMR1GIF
SPEN
SSP1IE
SSP1IF
ADDEN
TMR2IE
TMR2IF
OERR
TMR1IE
TMR1IF
RX9D
77
PIR1
RCIF
TXIF
—
80
RCSTA
SPBRGL
SPBRGH
SREN
CREN
FERR
246
248*
248*
116
237*
245
BRG<7:0>
BRG<15:8>
TRISB4 TRISB3
TRISB
TXREG
TXSTA
TRISB7
CSRC
TRISB6
TX9
TRISB5
TRISB2
TRISB1
TRMT
TRISB0
TX9D
EUSART Transmit Data Register
TXEN SYNC SENDB BRGH
Legend:
— = unimplemented location, read as ‘0’. Shaded cells are not used for synchronous master transmission.
*
Page provides register information.
DS40001609B-page 258
2011-2013 Microchip Technology Inc.
PIC16(L)F1508/9
buffer can be read, however, no additional characters
will be received until the error is cleared. The OERR bit
can only be cleared by clearing the overrun condition.
If the overrun error occurred when the SREN bit is set
and CREN is clear then the error is cleared by reading
RCREG. If the overrun occurred when the CREN bit is
set then the error condition is cleared by either clearing
the CREN bit of the RCSTA register or by clearing the
SPEN bit which resets the EUSART.
22.5.1.5
Synchronous Master Reception
Data is received at the RX/DT pin. The RX/DT pin
output driver is automatically disabled when the
EUSART is configured for synchronous master receive
operation.
In Synchronous mode, reception is enabled by setting
either the Single Receive Enable bit (SREN of the
RCSTA register) or the Continuous Receive Enable bit
(CREN of the RCSTA register).
22.5.1.8
Receiving 9-bit Characters
When SREN is set and CREN is clear, only as many
clock cycles are generated as there are data bits in a
single character. The SREN bit is automatically cleared
at the completion of one character. When CREN is set,
clocks are continuously generated until CREN is
cleared. If CREN is cleared in the middle of a character
the CK clock stops immediately and the partial charac-
ter is discarded. If SREN and CREN are both set, then
SREN is cleared at the completion of the first character
and CREN takes precedence.
The EUSART supports 9-bit character reception. When
the RX9 bit of the RCSTA register is set the EUSART
will shift 9-bits into the RSR for each character
received. The RX9D bit of the RCSTA register is the
ninth, and Most Significant, data bit of the top unread
character in the receive FIFO. When reading 9-bit data
from the receive FIFO buffer, the RX9D data bit must
be read before reading the eight Least Significant bits
from the RCREG.
To initiate reception, set either SREN or CREN. Data is
sampled at the RX/DT pin on the trailing edge of the
TX/CK clock pin and is shifted into the Receive Shift
Register (RSR). When a complete character is
received into the RSR, the RCIF bit is set and the char-
acter is automatically transferred to the two character
receive FIFO. The Least Significant eight bits of the top
character in the receive FIFO are available in RCREG.
The RCIF bit remains set as long as there are unread
characters in the receive FIFO.
22.5.1.9
Synchronous Master Reception
Set-up:
1. Initialize the SPBRGH, SPBRGL register pair for
the appropriate baud rate. Set or clear the
BRGH and BRG16 bits, as required, to achieve
the desired baud rate.
2. Clear the ANSEL bit for the RX pin (if applicable).
3. Enable the synchronous master serial port by
setting bits SYNC, SPEN and CSRC.
Note:
If the RX/DT function is on an analog pin,
the corresponding ANSEL bit must be
cleared for the receiver to function.
4. Ensure bits CREN and SREN are clear.
5. If interrupts are desired, set the RCIE bit of the
PIE1 register and the GIE and PEIE bits of the
INTCON register.
22.5.1.6
Slave Clock
6. If 9-bit reception is desired, set bit RX9.
Synchronous data transfers use a separate clock line,
which is synchronous with the data. A device configured
as a slave receives the clock on the TX/CK line. The
TX/CK pin output driver is automatically disabled when
the device is configured for synchronous slave transmit
or receive operation. Serial data bits change on the
leading edge to ensure they are valid at the trailing edge
of each clock. One data bit is transferred for each clock
cycle. Only as many clock cycles should be received as
there are data bits.
7. Start reception by setting the SREN bit or for
continuous reception, set the CREN bit.
8. Interrupt flag bit RCIF will be set when reception
of a character is complete. An interrupt will be
generated if the enable bit RCIE was set.
9. Read the RCSTA register to get the ninth bit (if
enabled) and determine if any error occurred
during reception.
10. Read the 8-bit received data by reading the
RCREG register.
Note:
If the device is configured as a slave and
the TX/CK function is on an analog pin, the
corresponding ANSEL bit must be
cleared.
11. If an overrun error occurs, clear the error by
either clearing the CREN bit of the RCSTA
register or by clearing the SPEN bit which resets
the EUSART.
22.5.1.7
Receive Overrun Error
The receive FIFO buffer can hold two characters. An
overrun error will be generated if a third character, in its
entirety, is received before RCREG is read to access
the FIFO. When this happens the OERR bit of the
RCSTA register is set. Previous data in the FIFO will
not be overwritten. The two characters in the FIFO
2011-2013 Microchip Technology Inc.
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PIC16(L)F1508/9
FIGURE 22-12:
SYNCHRONOUS RECEPTION (MASTER MODE, SREN)
RX/DT
pin
bit 0
bit 1
bit 2
bit 3
bit 4
bit 5
bit 6
bit 7
TX/CK pin
(SCKP = 0)
TX/CK pin
(SCKP = 1)
Write to
bit SREN
SREN bit
‘0’
‘0’
CREN bit
RCIF bit
(Interrupt)
Read
RCREG
Note:
Timing diagram demonstrates Sync Master mode with bit SREN = 1and bit BRGH = 0.
TABLE 22-8: SUMMARY OF REGISTERS ASSOCIATED WITH SYNCHRONOUS MASTER
RECEPTION
Register
on Page
Name
Bit 7
Bit 6
Bit 5
Bit 4
Bit 3
Bit 2
Bit 1
Bit 0
BAUDCON
INTCON
PIE1
ABDOVF
GIE
RCIDL
PEIE
ADIE
ADIF
—
SCKP
INTE
TXIE
TXIF
BRG16
IOCIE
—
TMR0IF
—
WUE
INTF
ABDEN
IOCIF
247
76
TMR0IE
RCIE
TMR1GIE
TMR1GIF
SSP1IE
SSP1IF
TMR2IE TMR1IE
TMR2IF TMR1IF
77
PIR1
RCIF
—
80
RCREG
RCSTA
SPBRGL
SPBRGH
TRISB
EUSART Receive Data Register
SREN CREN ADDEN FERR
BRG<7:0>
BRG<15:8>
TRISB6 TRISB5 TRISB4 TRISB3 TRISB2 TRISB1 TRISB0
TX9 TXEN SYNC SENDB BRGH TRMT TX9D
240*
246
248*
248*
116
245
SPEN
RX9
OERR
RX9D
TRISB7
CSRC
TXSTA
Legend: — = unimplemented location, read as ‘0’. Shaded cells are not used for synchronous master reception.
Page provides register information.
*
DS40001609B-page 260
2011-2013 Microchip Technology Inc.
PIC16(L)F1508/9
If two words are written to the TXREG and then the
SLEEPinstruction is executed, the following will occur:
22.5.2
SYNCHRONOUS SLAVE MODE
The following bits are used to configure the EUSART
for synchronous slave operation:
1. The first character will immediately transfer to
the TSR register and transmit.
• SYNC = 1
2. The second word will remain in the TXREG
register.
• CSRC = 0
• SREN = 0(for transmit); SREN = 1(for receive)
• CREN = 0(for transmit); CREN = 1(for receive)
• SPEN = 1
3. The TXIF bit will not be set.
4. After the first character has been shifted out of
TSR, the TXREG register will transfer the second
character to the TSR and the TXIF bit will now be
set.
Setting the SYNC bit of the TXSTA register configures
the device for synchronous operation. Clearing the
CSRC bit of the TXSTA register configures the device as
a slave. Clearing the SREN and CREN bits of the RCSTA
register ensures that the device is in the Transmit mode,
otherwise the device will be configured to receive. Setting
the SPEN bit of the RCSTA register enables the
EUSART.
5. If the PEIE and TXIE bits are set, the interrupt
will wake the device from Sleep and execute the
next instruction. If the GIE bit is also set, the
program will call the Interrupt Service Routine.
22.5.2.2
Synchronous Slave Transmission
Set-up:
22.5.2.1
EUSART Synchronous Slave
Transmit
1. Set the SYNC and SPEN bits and clear the
CSRC bit.
The operation of the Synchronous Master and Slave
modes are identical (see Section 22.5.1.3
“Synchronous Master Transmission”), except in the
2. Clear the ANSEL bit for the CK pin (if applicable).
3. Clear the CREN and SREN bits.
4. If interrupts are desired, set the TXIE bit of the
PIE1 register and the GIE and PEIE bits of the
INTCON register.
case of the Sleep mode.
5. If 9-bit transmission is desired, set the TX9 bit.
6. Enable transmission by setting the TXEN bit.
7. If 9-bit transmission is selected, insert the Most
Significant bit into the TX9D bit.
8. Start transmission by writing the Least
Significant eight bits to the TXREG register.
TABLE 22-9: SUMMARY OF REGISTERS ASSOCIATED WITH SYNCHRONOUS SLAVE
TRANSMISSION
Register
on Page
Name
Bit 7
Bit 6
Bit 5
Bit 4
Bit 3
Bit 2
Bit 1
Bit 0
BAUDCON
INTCON
PIE1
ABDOVF
GIE
RCIDL
PEIE
ADIE
ADIF
RX9
—
SCKP
INTE
TXIE
BRG16
IOCIE
—
TMR0IF
—
WUE
INTF
ABDEN
IOCIF
247
76
TMR0IE
RCIE
TMR1GIE
TMR1GIF
SSP1IE
SSP1IF
ADDEN
TMR2IE TMR1IE
TMR2IF TMR1IF
77
PIR1
RCIF
TXIF
—
80
SREN
CREN
FERR
OERR
RX9D
RCSTA
SPEN
246
116
237*
245
TRISB
TRISB7
TRISB6 TRISB5 TRISB4 TRISB3 TRISB2 TRISB1 TRISB0
EUSART Transmit Data Register
TXREG
TXSTA
CSRC
TX9
TXEN
SYNC
SENDB
BRGH
TRMT
TX9D
Legend: — = unimplemented location, read as ‘0’. Shaded cells are not used for synchronous slave transmission.
Page provides register information.
*
2011-2013 Microchip Technology Inc.
DS40001609B-page 261
PIC16(L)F1508/9
22.5.2.3
EUSART Synchronous Slave
Reception
22.5.2.4
Synchronous Slave Reception
Set-up:
The operation of the Synchronous Master and Slave
modes is identical (Section 22.5.1.5 “Synchronous
Master Reception”), with the following exceptions:
1. Set the SYNC and SPEN bits and clear the
CSRC bit.
2. Clear the ANSEL bit for both the CK and DT pins
(if applicable).
• Sleep
3. If interrupts are desired, set the RCIE bit of the
PIE1 register and the GIE and PEIE bits of the
INTCON register.
• CREN bit is always set, therefore the receiver is
never idle
• SREN bit, which is a “don’t care” in Slave mode
4. If 9-bit reception is desired, set the RX9 bit.
5. Set the CREN bit to enable reception.
A character may be received while in Sleep mode by
setting the CREN bit prior to entering Sleep. Once the
word is received, the RSR register will transfer the data
to the RCREG register. If the RCIE enable bit is set, the
interrupt generated will wake the device from Sleep
and execute the next instruction. If the GIE bit is also
set, the program will branch to the interrupt vector.
6. The RCIF bit will be set when reception is
complete. An interrupt will be generated if the
RCIE bit was set.
7. If 9-bit mode is enabled, retrieve the Most
Significant bit from the RX9D bit of the RCSTA
register.
8. Retrieve the eight Least Significant bits from the
receive FIFO by reading the RCREG register.
9. If an overrun error occurs, clear the error by
either clearing the CREN bit of the RCSTA
register or by clearing the SPEN bit which resets
the EUSART.
TABLE 22-10: SUMMARY OF REGISTERS ASSOCIATED WITH SYNCHRONOUS SLAVE
RECEPTION
Register
on Page
Name
Bit 7
Bit 6
Bit 5
Bit 4
Bit 3
Bit 2
Bit 1
Bit 0
BAUDCON
INTCON
PIE1
ABDOVF
GIE
RCIDL
PEIE
ADIE
ADIF
—
SCKP
INTE
TXIE
TXIF
BRG16
IOCIE
—
TMR0IF
—
WUE
INTF
ABDEN
IOCIF
247
76
TMR0IE
RCIE
TMR1GIE
TMR1GIF
SSP1IE
SSP1IF
TMR2IE TMR1IE
TMR2IF TMR1IF
77
PIR1
RCIF
—
80
RCREG
RCSTA
EUSART Receive Data Register
SREN CREN ADDEN FERR
240*
246
116
245
RX9
OERR
RX9D
SPEN
TRISB
TXSTA
TRISB7
CSRC
TRISB6 TRISB5 TRISB4 TRISB3 TRISB2 TRISB1 TRISB0
TX9 TXEN SYNC SENDB BRGH TRMT TX9D
Legend: — = unimplemented location, read as ‘0’. Shaded cells are not used for synchronous slave reception.
Page provides register information.
*
DS40001609B-page 262
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PIC16(L)F1508/9
Figure 23-1 shows a simplified block diagram of PWM
operation.
23.0 PULSE WIDTH MODULATION
(PWM) MODULE
For a step-by-step procedure on how to set up this
module for PWM operation, refer to Section 23.1.9
“Setup for PWM Operation using PWMx Pins”.
The PWM module generates a Pulse-Width Modulated
signal determined by the duty cycle, period, and reso-
lution that are configured by the following registers:
• PR2
• T2CON
• PWMxDCH
• PWMxDCL
• PWMxCON
FIGURE 23-1:
SIMPLIFIED PWM BLOCK DIAGRAM
Rev. 10-000022A_A0
PWMxDCL<7:6>
Duty cycle registers
PWMxDCH
PWMx_out
To Peripherals
10-bit Latch
(Not visible to user)
PWMxOE
R
S
Q
Q
Comparator
0
PWMx
1
TMR2 Module
TRIS Control
PWMxPOL
R
(1)
TMR2
Comparator
PR2
T2_match
Note 1: 8-bit timer is concatenated with two bits generated by Fosc or two bits of the internal prescaler to
create 10-bit time-base.
2011-2013 Microchip Technology Inc.
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PIC16(L)F1508/9
When TMR2 is equal to PR2, the following three events
occur on the next increment cycle:
23.1 PWMx Pin Configuration
All PWM outputs are multiplexed with the PORT data
latch. The user must configure the pins as outputs by
clearing the associated TRIS bits.
• TMR2 is cleared
• The PWM output is active. (Exception: When the
PWM duty cycle = 0%, the PWM output will
remain inactive.)
Note:
Clearing the PWMxOE bit will relinquish
control of the PWMx pin.
• The PWMxDCH and PWMxDCL register values
are latched into the buffers.
23.1.1
FUNDAMENTAL OPERATION
Note:
The Timer2 postscaler has no effect on
the PWM operation.
The PWM module produces a 10-bit resolution output.
Timer2 and PR2 set the period of the PWM. The
PWMxDCL and PWMxDCH registers configure the
duty cycle. The period is common to all PWM modules,
whereas the duty cycle is independently controlled.
23.1.4
PWM DUTY CYCLE
The PWM duty cycle is specified by writing a 10-bit
value to the PWMxDCH and PWMxDCL register pair.
The PWMxDCH register contains the eight MSbs and
the PWMxDCL<7:6>, the two LSbs. The PWMxDCH
and PWMxDCL registers can be written to at any time.
Note:
The Timer2 postscaler is not used in the
determination of the PWM frequency. The
postscaler could be used to have a servo
update rate at a different frequency than
the PWM output.
Equation 23-2 is used to calculate the PWM pulse width.
Equation 23-3 is used to calculate the PWM duty cycle
ratio.
All PWM outputs associated with Timer2 are set when
TMR2 is cleared. Each PWMx is cleared when TMR2
is equal to the value specified in the corresponding
PWMxDCH (8 MSb) and PWMxDCL<7:6> (2 LSb) reg-
isters. When the value is greater than or equal to PR2,
the PWM output is never cleared (100% duty cycle).
EQUATION 23-2: PULSE WIDTH
Pulse Width = PWMxDCH:PWMxDCL<7:6>
Note:
The PWMxDCH and PWMxDCL registers
are double buffered. The buffers are
updated when Timer2 matches PR2. Care
should be taken to update both registers
before the timer match occurs.
TOSC (TMR2 Prescale Value)
Note: TOSC = 1/FOSC
EQUATION 23-3: DUTY CYCLE RATIO
23.1.2
PWM OUTPUT POLARITY
PWMxDCH:PWMxDCL<7:6>
Duty Cycle Ratio = -----------------------------------------------------------------------------------
4PR2 + 1
The output polarity is inverted by setting the PWMxPOL
bit of the PWMxCON register.
23.1.3
PWM PERIOD
The 8-bit timer TMR2 register is concatenated with the
two Least Significant bits of 1/FOSC, adjusted by the
Timer2 prescaler to create the 10-bit time base. The
system clock is used if the Timer2 prescaler is set to 1:1.
The PWM period is specified by the PR2 register of
Timer2. The PWM period can be calculated using the
formula of Equation 23-1.
Figure 23-2 shows a waveform of the PWM signal when
the duty cycle is set for the smallest possible pulse.
EQUATION 23-1: PWM PERIOD
PWM Period = PR2 + 1 4 TOSC
FIGURE 23-2:
PWM OUTPUT
(TMR2 Prescale Value)
Rev. 10-000023A_A0
Q1
Q2
Q3
Q4
Note:
TOSC = 1/FOSC
FOSC
Pulse Width
TMR2 = PR2
PWM
TMR2 = 0
TMR2 = PWMxDC
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PIC16(L)F1508/9
23.1.5
PWM RESOLUTION
The resolution determines the number of available duty
cycles for a given period. For example, a 10-bit resolu-
tion will result in 1024 discrete duty cycles, whereas an
8-bit resolution will result in 256 discrete duty cycles.
The maximum PWM resolution is ten bits when PR2 is
255. The resolution is a function of the PR2 register
value as shown by Equation 23-4.
EQUATION 23-4: PWM RESOLUTION
log4PR2 + 1
Resolution = ----------------------------------------- bits
log2
Note:
If the pulse width value is greater than the
period the assigned PWM pin(s) will
remain unchanged.
TABLE 23-1: EXAMPLE PWM FREQUENCIES AND RESOLUTIONS (FOSC = 20 MHz)
PWM Frequency
Timer Prescale
0.31 kHz
4.88 kHz
19.53 kHz
78.12 kHz
156.3 kHz
208.3 kHz
64
0xFF
10
4
1
1
0x3F
8
1
0x1F
7
1
PR2 Value
0xFF
10
0xFF
10
0x17
6.6
Maximum Resolution (bits)
TABLE 23-2: EXAMPLE PWM FREQUENCIES AND RESOLUTIONS (FOSC = 8 MHz)
PWM Frequency
Timer Prescale
0.31 kHz
4.90 kHz
19.61 kHz
76.92 kHz
153.85 kHz 200.0 kHz
64
0x65
8
4
0x65
8
1
0x65
8
1
0x19
6
1
0x0C
5
1
0x09
5
PR2 Value
Maximum Resolution (bits)
23.1.6
OPERATION IN SLEEP MODE
In Sleep mode, the TMR2 register will not increment
and the state of the module will not change. If the
PWMx pin is driving a value, it will continue to drive that
value. When the device wakes up, TMR2 will continue
from its previous state.
23.1.7
CHANGES IN SYSTEM CLOCK
FREQUENCY
The PWM frequency is derived from the system clock
frequency (FOSC). Any changes in the system clock fre-
quency will result in changes to the PWM frequency.
Refer to Section 5.0 “Oscillator Module (With
Fail-Safe Clock Monitor)” for additional details.
23.1.8
EFFECTS OF RESET
Any Reset will force all ports to Input mode and the
PWM registers to their Reset states.
2011-2013 Microchip Technology Inc.
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PIC16(L)F1508/9
23.1.9
SETUP FOR PWM OPERATION
USING PWMx PINS
The following steps should be taken when configuring
the module for PWM operation using the PWMx pins:
1. Disable the PWMx pin output driver(s) by setting
the associated TRIS bit(s).
2. Clear the PWMxCON register.
3. Load the PR2 register with the PWM period
value.
4. Clear the PWMxDCH register and bits <7:6> of
the PWMxDCL register.
5. Configure and start Timer2:
• Clear the TMR2IF interrupt flag bit of the
PIR1 register. See note below.
• Configure the T2CKPS bits of the T2CON
register with the Timer2 prescale value.
• Enable Timer2 by setting the TMR2ON bit of
the T2CON register.
6. Enable PWM output pin and wait until Timer2
overflows, TMR2IF bit of the PIR1 register is set.
See note below.
7. Enable the PWMx pin output driver(s) by clear-
ing the associated TRIS bit(s) and setting the
PWMxOE bit of the PWMxCON register.
8. Configure the PWM module by loading the
PWMxCON register with the appropriate values.
Note 1: In order to send a complete duty cycle
and period on the first PWM output, the
above steps must be followed in the order
given. If it is not critical to start with a
complete PWM signal, then move Step 8
to replace Step 4.
2: For operation with other peripherals only,
disable PWMx pin outputs.
DS40001609B-page 266
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PIC16(L)F1508/9
23.2 Register Definitions: PWM Control
REGISTER 23-1: PWMxCON: PWM CONTROL REGISTER
R/W-0/0
R/W-0/0
R-0/0
R/W-0/0
U-0
—
U-0
—
U-0
—
U-0
—
PWMxEN
PWMxOE
PWMxOUT PWMxPOL
bit 7
bit 0
Legend:
R = Readable bit
W = Writable bit
x = Bit is unknown
‘0’ = Bit is cleared
U = Unimplemented bit, read as ‘0’
-n/n = Value at POR and BOR/Value at all other Resets
u = Bit is unchanged
‘1’ = Bit is set
bit 7
bit 6
PWMxEN: PWM Module Enable bit
1= PWM module is enabled
0= PWM module is disabled
PWMxOE: PWM Module Output Enable bit
1= Output to PWMx pin is enabled
0= Output to PWMx pin is disabled
bit 5
bit 4
PWMxOUT: PWM Module Output Value bit
PWMxPOL: PWMx Output Polarity Select bit
1= PWM output is active low
0= PWM output is active high
bit 3-0
Unimplemented: Read as ‘0’
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PIC16(L)F1508/9
REGISTER 23-2: PWMxDCH: PWM DUTY CYCLE HIGH BITS
R/W-x/u
R/W-x/u
R/W-x/u
R/W-x/u
R/W-x/u
R/W-x/u
R/W-x/u
R/W-x/u
bit 0
PWMxDCH<7:0>
bit 7
Legend:
R = Readable bit
W = Writable bit
U = Unimplemented bit, read as ‘0’
-n/n = Value at POR and BOR/Value at all other Resets
u = Bit is unchanged
‘1’ = Bit is set
x = Bit is unknown
‘0’ = Bit is cleared
bit 7-0
PWMxDCH<7:0>: PWM Duty Cycle Most Significant bits
These bits are the MSbs of the PWM duty cycle. The two LSbs are found in the PWMxDCL register.
REGISTER 23-3: PWMxDCL: PWM DUTY CYCLE LOW BITS
R/W-x/u
R/W-x/u
U-0
—
U-0
—
U-0
—
U-0
—
U-0
—
U-0
—
PWMxDCL<7:6>
bit 7
bit 0
Legend:
R = Readable bit
W = Writable bit
x = Bit is unknown
‘0’ = Bit is cleared
U = Unimplemented bit, read as ‘0’
-n/n = Value at POR and BOR/Value at all other Resets
u = Bit is unchanged
‘1’ = Bit is set
bit 7-6
bit 5-0
PWMxDCL<7:6>: PWM Duty Cycle Least Significant bits
These bits are the LSbs of the PWM duty cycle. The MSbs are found in the PWMxDCH register.
Unimplemented: Read as ‘0’
TABLE 23-3: SUMMARY OF REGISTERS ASSOCIATED WITH PWM
Register
on Page
Name
Bit 7
Bit 6
Bit 5
Bit 4
Bit 3
Bit 2
Bit 1
Bit 0
PR2
Timer2 module Period Register
175*
267
268
268
267
268
268
267
268
268
267
268
268
177
175*
PWM1CON
PWM1DCH
PWM1DCL
PWM2CON
PWM2DCH
PWM2DCL
PWM3CON
PWM3DCH
PWM3DCL
PWM4CON
PWM4DCH
PWM4DCL
T2CON
PWM1EN
PWM1OE
PWM1OUT
PWM1POL
—
—
—
—
PWM1DCH<7:0>
PWM1DCL<7:6>
—
—
—
—
—
—
—
—
—
—
PWM2EN
PWM2OE
PWM2OUT
PWM2POL
PWM2DCH<7:0>
PWM2DCL<7:6>
—
—
—
—
—
—
—
—
—
—
PWM3EN
PWM3OE
PWM3OUT
PWM3POL
PWM3DCH<7:0>
PWM3DCL<7:6>
—
—
—
—
—
—
—
—
—
—
PWM4EN
PWM4OE
PWM4OUT
PWM4POL
PWM4DCH<7:0>
PWM4DCL<7:6>
—
—
—
—
—
—
—
T2OUTPS<3:0>
TMR2ON
T2CKPS<1:0>
TMR2
Timer2 module Register
—(1)
TRISA
—
—
TRISA5
TRISC5
TRISA4
TRISA2
TRISC2
TRISA1
TRISC1
TRISA0
TRISC0
112
120
TRISC
TRISC7
TRISC6
TRISC4
TRISC3
Legend:
-= Unimplemented locations, read as ‘0’, u= unchanged, x= unknown. Shaded cells are not used by the PWM.
*
Page provides register information.
Note 1:
Unimplemented, read as ‘1’.
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Refer to Figure 24-1 for a simplified diagram showing
signal flow through the CLCx.
24.0 CONFIGURABLE LOGIC CELL
(CLC)
Possible configurations include:
The Configurable Logic Cell (CLCx) provides program-
mable logic that operates outside the speed limitations
of software execution. The logic cell takes up to 16
input signals, and through the use of configurable
gates, reduces the 16 inputs to four logic lines that drive
one of eight selectable single-output logic functions.
•
Combinatorial Logic
- AND
- NAND
- AND-OR
- AND-OR-INVERT
- OR-XOR
Input sources are a combination of the following:
• I/O pins
- OR-XNOR
• Internal clocks
• Peripherals
• Register bits
• Latches
- S-R
- Clocked D with Set and Reset
- Transparent D with Set and Reset
- Clocked J-K with Reset
The output can be directed internally to peripherals and
to an output pin.
FIGURE 24-1:
CLCx SIMPLIFIED BLOCK DIAGRAM
Rev. 10-000025A_A1
LCxOUT
MLCxOUT
D
Q
Q1
LCx_in[0]
LCx_in[1]
LCx_in[2]
LCx_in[3]
LCx_in[4]
LCx_in[5]
LCx_in[6]
LCx_in[7]
LCx_in[8]
LCx_in[9]
LCx_in[10]
LCx_in[11]
LCx_in[12]
LCx_in[13]
LCx_in[14]
LCx_in[15]
to Peripherals
LCxOE
LCxEN
lcxq
lcxg1
lcxg2
lcxg3
lcxg4
TRIS Control
Logic
LCx_out
Function
CLCx
(2)
LCxPOL
LCxMODE<2:0>
Interrupt
det
LCXINTP
LCXINTN
set bit
CLCxIF
Interrupt
det
Note 1: See Figure 24-2, Input Data Selection and Gating.
2: See Figure 24-3, Programmable Logic Functions.
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each case, paired with a different group. This arrange-
ment makes possible selection of up to two from a
group without precluding a selection from another
group.
24.1 CLCx Setup
Programming the CLCx module is performed by config-
uring the four stages in the logic signal flow. The four
stages are:
Data selection is through four multiplexers as indicated
on the left side of Figure 24-2. Data inputs in the figure
are identified by a generic numbered input name.
• Data selection
• Data gating
• Logic function selection
• Output polarity
Table 24-1 correlates the generic input name to the
actual signal for each CLC module. The columns labeled
lcxd1 through lcxd4 indicate the MUX output for the
selected data input. D1S through D4S are abbreviations
for the MUX select input codes: LCxD1S<2:0> through
LCxD4S<2:0>, respectively. Selecting a data input in a
column excludes all other inputs in that column.
Each stage is setup at run time by writing to the corre-
sponding CLCx Special Function Registers. This has
the added advantage of permitting logic reconfiguration
on-the-fly during program execution.
24.1.1
DATA SELECTION
Data inputs are selected with CLCxSEL0 and
CLCxSEL1 registers (Register 24-3 and Register 24-5,
respectively).
There are 16 signals available as inputs to the configu-
rable logic. Four 8-input multiplexers are used to select
the inputs to pass on to the next stage. The 16 inputs
to the multiplexers are arranged in groups of four. Each
group is available to two of the four multiplexers, in
Note:
Data selections are undefined at power-up.
TABLE 24-1: CLCx DATA INPUT SELECTION
lcxd1 lcxd2 lcxd3 lcxd4
Data Input
CLC 1
CLC 2
CLC2IN0
CLC 3
CLC3IN0
CLC 4
CLC4IN0
D1S
D2S
D3S
D4S
LCx_in[0]
LCx_in[1]
LCx_in[2]
LCx_in[3]
LCx_in[4]
LCx_in[5]
LCx_in[6]
LCx_in[7]
LCx_in[8]
LCx_in[9]
LCx_in[10]
LCx_in[11]
LCx_in[12]
000
001
010
011
100
101
110
111
—
—
—
—
—
100 CLC1IN0
101 CLC1IN1
CLC2IN1
C1OUT_sync
C2OUT_sync
FOSC
CLC3IN1
C1OUT_sync
C2OUT_sync
FOSC
CLC4IN1
C1OUT_sync
C2OUT_sync
FOSC
—
—
110 C1OUT_sync
111 C2OUT_sync
—
—
000
001
010
011
100
101
110
111
—
—
—
—
—
—
—
—
—
—
FOSC
—
T0_overflow
T1_overflow
T2_match
LC1_out
LC2_out
LC3_out
LC4_out
T0_overflow
T1_overflow
T2_match
LC1_out
T0_overflow
T1_overflow
T2_match
LC1_out
T0_overflow
T1_overflow
T2_match
LC1_out
—
—
000
001
010
011
100
—
LC2_out
LC2_out
LC2_out
—
LC3_out
LC3_out
LC3_out
—
LC4_out
LC4_out
LC4_out
—
000 NCO1_out
LFINTOSC
TX_out
(EUSART)
SCK_output
(MSSP)
LCx_in[13]
—
—
101
001 HFINTOSC
FRC
LFINTOSC
SDO_output
(MSSP)
LCx_in[14]
LCx_in[15]
—
—
—
—
110
111
010 PWM3_out
011 PWM4_out
PWM1_out
PWM2_out
PWM2_out
PWM3_out
PWM1_out
PWM4_out
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Data gating is indicated in the right side of Figure 24-2.
Only one gate is shown in detail. The remaining three
gates are configured identically with the exception that
the data enables correspond to the enables for that
gate.
24.1.2
DATA GATING
Outputs from the input multiplexers are directed to the
desired logic function input through the data gating
stage. Each data gate can direct any combination of the
four selected inputs.
24.1.3
LOGIC FUNCTION
Note:
Data gating is undefined at power-up.
There are eight available logic functions including:
The gate stage is more than just signal direction. The
gate can be configured to direct each input signal as
inverted or non-inverted data. Directed signals are
ANDed together in each gate. The output of each gate
can be inverted before going on to the logic function
stage.
• AND-OR
• OR-XOR
• AND
• S-R Latch
• D Flip-Flop with Set and Reset
• D Flip-Flop with Reset
• J-K Flip-Flop with Reset
• Transparent Latch with Set and Reset
The gating is in essence
a
1-to-4 input
AND/NAND/OR/NOR gate. When every input is
inverted and the output is inverted, the gate is an OR of
all enabled data inputs. When the inputs and output are
not inverted, the gate is an AND or all enabled inputs.
Logic functions are shown in Figure 24-3. Each logic
function has four inputs and one output. The four inputs
are the four data gate outputs of the previous stage.
The output is fed to the inversion stage and from there
to other peripherals, an output pin, and back to the
CLCx itself.
Table 24-2 summarizes the basic logic that can be
obtained in gate 1 by using the gate logic select bits.
The table shows the logic of four input variables, but
each gate can be configured to use less than four. If
no inputs are selected, the output will be zero or one,
depending on the gate output polarity bit.
24.1.4
OUTPUT POLARITY
The last stage in the configurable logic cell is the output
polarity. Setting the LCxPOL bit of the CLCxCON reg-
ister inverts the output signal from the logic stage.
Changing the polarity while the interrupts are enabled
will cause an interrupt for the resulting output transition.
TABLE 24-2: DATA GATING LOGIC
CLCxGLS0
LCxG1POL
Gate Logic
0x55
0x55
0xAA
0xAA
0x00
0x00
1
0
1
0
0
1
AND
NAND
NOR
OR
Logic 0
Logic 1
It is possible (but not recommended) to select both the
true and negated values of an input. When this is done,
the gate output is zero, regardless of the other inputs,
but may emit logic glitches (transient-induced pulses).
If the output of the channel must be zero or one, the
recommended method is to set all gate bits to zero and
use the gate polarity bit to set the desired level.
Data gating is configured with the logic gate select
registers as follows:
• Gate 1: CLCxGLS0 (Register 24-5)
• Gate 2: CLCxGLS1 (Register 24-6)
• Gate 3: CLCxGLS2 (Register 24-7)
• Gate 4: CLCxGLS3 (Register 24-8)
Register number suffixes are different than the gate
numbers because other variations of this module have
multiple gate selections in the same register.
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24.1.5
CLCx SETUP STEPS
24.2 CLCx Interrupts
The following steps should be followed when setting up
the CLCx:
An interrupt will be generated upon a change in the
output value of the CLCx when the appropriate interrupt
enables are set. A rising edge detector and a falling
edge detector are present in each CLC for this purpose.
• Disable CLCx by clearing the LCxEN bit.
• Select desired inputs using CLCxSEL0 and
CLCxSEL1 registers (See Table 24-1).
• Clear any associated ANSEL bits.
The CLCxIF bit of the associated PIR registers will be
set when either edge detector is triggered and its asso-
ciated enable bit is set. The LCxINTP enables rising
edge interrupts and the LCxINTN bit enables falling
edge interrupts. Both are located in the CLCxCON
register.
• Set all TRIS bits associated with inputs.
• Clear all TRIS bits associated with outputs.
• Enable the chosen inputs through the four gates
using CLCxGLS0, CLCxGLS1, CLCxGLS2, and
CLCxGLS3 registers.
To fully enable the interrupt, set the following bits:
• Select the gate output polarities with the
LCxPOLy bits of the CLCxPOL register.
• LCxON bit of the CLCxCON register
• CLCxIE bit of the associated PIE registers
• Select the desired logic function with the
LCxMODE<2:0> bits of the CLCxCON register.
• LCxINTP bit of the CLCxCON register (for a rising
edge detection)
• Select the desired polarity of the logic output with
the LCxPOL bit of the CLCxPOL register. (This
step may be combined with the previous gate
output polarity step).
• LCxINTN bit of the CLCxCON register (for a
falling edge detection)
• PEIE and GIE bits of the INTCON register
The CLCxIF bit of the associated PIR registers, must
be cleared in software as part of the interrupt service. If
another edge is detected while this flag is being
cleared, the flag will still be set at the end of the
sequence.
• If driving a device, set the desired pin PPS control
register and also clear the TRIS bit corresponding
to that output.
• If interrupts are desired, configure the following
bits:
- Set the LCxINTP bit in the CLCxCON register
for rising event.
24.3 Output Mirror Copies
Mirror copies of all LCxCON output bits are contained
in the CLCxDATA register. Reading this register reads
the outputs of all CLCs simultaneously. This prevents
any reading skew introduced by testing or reading the
CLCxOUT bits in the individual CLCxCON registers.
- Set the LCxINTN bit in the CLCxCON
register or falling event.
- Set the CLCxIE bit of the associated PIE
registers.
- Set the GIE and PEIE bits of the INTCON
register.
24.4 Effects of a Reset
• Enable the CLCx by setting the LCxEN bit of the
CLCxCON register.
The CLCxCON register is cleared to zero as the result
of a Reset. All other selection and gating values remain
unchanged.
24.5 Operation During Sleep
The CLC module operates independently from the
system clock and will continue to run during Sleep,
provided that the input sources selected remain active.
The HFINTOSC remains active during Sleep when the
CLC module is enabled and the HFINTOSC is
selected as an input source, regardless of the system
clock source selected.
In other words, if the HFINTOSC is simultaneously
selected as the system clock and as a CLC input
source, when the CLC is enabled, the CPU will go idle
during Sleep, but the CLC will continue to operate and
the HFINTOSC will remain active.
This will have a direct effect on the Sleep mode current.
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FIGURE 24-2:
INPUT DATA SELECTION AND GATING
Data Selection
LCx_in[0]
00000
Data GATE 1
lcxd1T
lcxd1N
LCxD1G1T
LCxD1G1N
LCxD2G1T
LCxD2G1N
LCxD3G1T
LCxD3G1N
LCxD4G1T
LCxD4G1N
11111
00000
LCx_in[31]
LCx_in[0]
LCxD1S<4:0>
lcxg1
LCxG1POL
lcxd2T
lcxd2N
11111
00000
LCx_in[31]
LCx_in[0]
LCxD2S<4:0>
LCxD3S<4:0>
LCxD4S<4:0>
Data GATE 2
lcxg2
lcxd3T
lcxd3N
(Same as Data GATE 1)
Data GATE 3
11111
00000
LCx_in[31]
LCx_in[0]
lcxg3
lcxg4
(Same as Data GATE 1)
Data GATE 4
(Same as Data GATE 1)
lcxd4T
lcxd4N
11111
LCx_in[31]
Note:
All controls are undefined at power-up.
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FIGURE 24-3:
PROGRAMMABLE LOGIC FUNCTIONS
AND - OR
OR - XOR
lcxg1
lcxg2
lcxg3
lcxg4
lcxg1
lcxg2
lcxg3
lcxg4
lcxq
lcxq
LCxMODE<2:0>= 000
LCxMODE<2:0>= 001
4-Input AND
S-R Latch
lcxg1
lcxg1
lcxq
S
R
Q
lcxg2
lcxg3
lcxg4
lcxg2
lcxg3
lcxg4
lcxq
LCxMODE<2:0>= 010
LCxMODE<2:0>= 011
1-Input D Flip-Flop with S and R
2-Input D Flip-Flop with R
lcxg4
lcxg4
lcxg2
S
lcxq
D
Q
lcxg2
lcxq
D
Q
lcxg1
lcxg3
lcxg1
lcxg3
R
R
LCxMODE<2:0>= 100
LCxMODE<2:0>= 101
J-K Flip-Flop with R
1-Input Transparent Latch with S and R
lcxg4
lcxg2
lcxg1
lcxg4
lcxq
J
Q
S
lcxg2
lcxq
D
Q
K
R
LE
lcxg1
lcxg3
R
lcxg3
LCxMODE<2:0>= 110
LCxMODE<2:0>= 111
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24.6 Register Definitions: CLC Control
REGISTER 24-1: CLCxCON: CONFIGURABLE LOGIC CELL CONTROL REGISTER
R/W-0/0
LCxEN
U-0
—
R-0/0
R/W-0/0
R/W-0/0
R/W-0/0
R/W-0/0
R/W-0/0
bit 0
LCxOUT
LCxINTP
LCxINTN
LCxMODE<2:0>
bit 7
Legend:
R = Readable bit
u = Bit is unchanged
‘1’ = Bit is set
W = Writable bit
U = Unimplemented bit, read as ‘0’
-n/n = Value at POR and BOR/Value at all other Resets
x = Bit is unknown
‘0’ = Bit is cleared
bit 7
LCxEN: Configurable Logic Cell Enable bit
1= Configurable logic cell is enabled and mixing input signals
0= Configurable logic cell is disabled and has logic zero output
bit 6
bit 5
Unimplemented: Read as ‘0’
LCxOUT: Configurable Logic Cell Data Output bit
Read-only: logic cell output data, after LCxPOL; sampled from lcx_out wire.
LCxINTP: Configurable Logic Cell Positive Edge Going Interrupt Enable bit
bit 4
1= CLCxIF will be set when a rising edge occurs on lcx_out
0= CLCxIF will not be set
bit 3
LCxINTN: Configurable Logic Cell Negative Edge Going Interrupt Enable bit
1= CLCxIF will be set when a falling edge occurs on lcx_out
0= CLCxIF will not be set
bit 2-0
LCxMODE<2:0>: Configurable Logic Cell Functional Mode bits
111= Cell is 1-input transparent latch with S and R
110= Cell is J-K flip-flop with R
101= Cell is 2-input D flip-flop with R
100= Cell is 1-input D flip-flop with S and R
011= Cell is S-R latch
010= Cell is 4-input AND
001= Cell is OR-XOR
000= Cell is AND-OR
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REGISTER 24-2: CLCxPOL: SIGNAL POLARITY CONTROL REGISTER
R/W-0/0
LCxPOL
U-0
—
U-0
—
U-0
—
R/W-x/u
R/W-x/u
R/W-x/u
R/W-x/u
LCxG4POL LCxG3POL
LCxG2POL LCxG1POL
bit 0
bit 7
Legend:
R = Readable bit
u = Bit is unchanged
‘1’ = Bit is set
W = Writable bit
x = Bit is unknown
‘0’ = Bit is cleared
U = Unimplemented bit, read as ‘0’
-n/n = Value at POR and BOR/Value at all other Resets
bit 7
LCxPOL: LCOUT Polarity Control bit
1= The output of the logic cell is inverted
0= The output of the logic cell is not inverted
bit 6-4
bit 3
Unimplemented: Read as ‘0’
LCxG4POL: Gate 4 Output Polarity Control bit
1= The output of gate 4 is inverted when applied to the logic cell
0= The output of gate 4 is not inverted
bit 2
bit 1
bit 0
LCxG3POL: Gate 3 Output Polarity Control bit
1= The output of gate 3 is inverted when applied to the logic cell
0= The output of gate 3 is not inverted
LCxG2POL: Gate 2 Output Polarity Control bit
1= The output of gate 2 is inverted when applied to the logic cell
0= The output of gate 2 is not inverted
LCxG1POL: Gate 1 Output Polarity Control bit
1= The output of gate 1 is inverted when applied to the logic cell
0= The output of gate 1 is not inverted
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REGISTER 24-3: CLCxSEL0: MULTIPLEXER DATA 1 AND 2 SELECT REGISTER
U-0
—
R/W-x/u
R/W-x/u
R/W-x/u
U-0
—
R/W-x/u
R/W-x/u
R/W-x/u
(1)
(1)
LCxD2S<2:0>
LCxD1S<2:0>
bit 7
bit 0
Legend:
R = Readable bit
W = Writable bit
U = Unimplemented bit, read as ‘0’
u = Bit is unchanged
‘1’ = Bit is set
x = Bit is unknown
‘0’ = Bit is cleared
-n/n = Value at POR and BOR/Value at all other Resets
bit 7
Unimplemented: Read as ‘0’
(1)
bit 6-4
LCxD2S<2:0>: Input Data 2 Selection Control bits
111= LCx_in[11] is selected for lcxd2
110= LCx_in[10] is selected for lcxd2
101= LCx_in[9] is selected for lcxd2
100= LCx_in[8] is selected for lcxd2
011= LCx_in[7] is selected for lcxd2
010= LCx_in[6] is selected for lcxd2
001= LCx_in[5] is selected for lcxd2
000= LCx_in[4] is selected for lcxd2
bit 3
Unimplemented: Read as ‘0’
(1)
bit 2-0
LCxD1S<2:0>: Input Data 1 Selection Control bits
111= LCx_in[7] is selected for lcxd1
110= LCx_in[6] is selected for lcxd1
101= LCx_in[5] is selected for lcxd1
100= LCx_in[4] is selected for lcxd1
011= LCx_in[3] is selected for lcxd1
010= LCx_in[2] is selected for lcxd1
001= LCx_in[1] is selected for lcxd1
000= LCx_in[0] is selected for lcxd1
Note 1: See Table 24-1 for signal names associated with inputs.
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REGISTER 24-4: CLCxSEL1: MULTIPLEXER DATA 3 AND 4 SELECT REGISTER
U-0
—
R/W-x/u
R/W-x/u
R/W-x/u
U-0
—
R/W-x/u
R/W-x/u
R/W-x/u
(1)
(1)
LCxD4S<2:0>
LCxD3S<2:0>
bit 7
bit 0
Legend:
R = Readable bit
W = Writable bit
U = Unimplemented bit, read as ‘0’
u = Bit is unchanged
‘1’ = Bit is set
x = Bit is unknown
‘0’ = Bit is cleared
-n/n = Value at POR and BOR/Value at all other Resets
bit 7
Unimplemented: Read as ‘0’
(1)
bit 6-4
LCxD4S<2:0>: Input Data 4 Selection Control bits
111= LCx_in[3] is selected for lcxd4
110= LCx_in[2] is selected for lcxd4
101= LCx_in[1] is selected for lcxd4
100= LCx_in[0] is selected for lcxd4
011= LCx_in[15] is selected for lcxd4
010= LCx_in[14] is selected for lcxd4
001= LCx_in[13] is selected for lcxd4
000= LCx_in[12] is selected for lcxd4
bit 3
Unimplemented: Read as ‘0’
(1)
bit 2-0
LCxD3S<2:0>: Input Data 3 Selection Control bits
111= LCx_in[15] is selected for lcxd3
110= LCx_in[14] is selected for lcxd3
101= LCx_in[13] is selected for lcxd3
100= LCx_in[12] is selected for lcxd3
011= LCx_in[11] is selected for lcxd3
010= LCx_in[10] is selected for lcxd3
001= LCx_in[9] is selected for lcxd3
000= LCx_in[8] is selected for lcxd3
Note 1: See Table 24-1 for signal names associated with inputs.
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REGISTER 24-5: CLCxGLS0: GATE 1 LOGIC SELECT REGISTER
R/W-x/u
R/W-x/u
R/W-x/u
R/W-x/u
R/W-x/u
R/W-x/u
R/W-x/u
R/W-x/u
LCxG1D4T
LCxG1D4N LCxG1D3T LCxG1D3N LCxG1D2T
LCxG1D2N
LCxG1D1T LCxG1D1N
bit 0
bit 7
Legend:
R = Readable bit
u = Bit is unchanged
‘1’ = Bit is set
W = Writable bit
x = Bit is unknown
‘0’ = Bit is cleared
U = Unimplemented bit, read as ‘0’
-n/n = Value at POR and BOR/Value at all other Resets
bit 7
bit 6
bit 5
bit 4
bit 3
bit 2
bit 1
bit 0
LCxG1D4T: Gate 1 Data 4 True (non-inverted) bit
1= lcxd4T is gated into lcxg1
0= lcxd4T is not gated into lcxg1
LCxG1D4N: Gate 1 Data 4 Negated (inverted) bit
1= lcxd4N is gated into lcxg1
0= lcxd4N is not gated into lcxg1
LCxG1D3T: Gate 1 Data 3 True (non-inverted) bit
1= lcxd3T is gated into lcxg1
0= lcxd3T is not gated into lcxg1
LCxG1D3N: Gate 1 Data 3 Negated (inverted) bit
1= lcxd3N is gated into lcxg1
0= lcxd3N is not gated into lcxg1
LCxG1D2T: Gate 1 Data 2 True (non-inverted) bit
1= lcxd2T is gated into lcxg1
0= lcxd2T is not gated into lcxg1
LCxG1D2N: Gate 1 Data 2 Negated (inverted) bit
1= lcxd2N is gated into lcxg1
0= lcxd2N is not gated into lcxg1
LCxG1D1T: Gate 1 Data 1 True (non-inverted) bit
1= lcxd1T is gated into lcxg1
0= lcxd1T is not gated into lcxg1
LCxG1D1N: Gate 1 Data 1 Negated (inverted) bit
1= lcxd1N is gated into lcxg1
0= lcxd1N is not gated into lcxg1
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PIC16(L)F1508/9
REGISTER 24-6: CLCxGLS1: GATE 2 LOGIC SELECT REGISTER
R/W-x/u
R/W-x/u
R/W-x/u
R/W-x/u
R/W-x/u
R/W-x/u
R/W-x/u
R/W-x/u
LCxG2D4T
LCxG2D4N LCxG2D3T LCxG2D3N LCxG2D2T
LCxG2D2N
LCxG2D1T LCxG2D1N
bit 0
bit 7
Legend:
R = Readable bit
u = Bit is unchanged
‘1’ = Bit is set
W = Writable bit
x = Bit is unknown
‘0’ = Bit is cleared
U = Unimplemented bit, read as ‘0’
-n/n = Value at POR and BOR/Value at all other Resets
bit 7
bit 6
bit 5
bit 4
bit 3
bit 2
bit 1
bit 0
LCxG2D4T: Gate 2 Data 4 True (non-inverted) bit
1= lcxd4T is gated into lcxg2
0= lcxd4T is not gated into lcxg2
LCxG2D4N: Gate 2 Data 4 Negated (inverted) bit
1= lcxd4N is gated into lcxg2
0= lcxd4N is not gated into lcxg2
LCxG2D3T: Gate 2 Data 3 True (non-inverted) bit
1= lcxd3T is gated into lcxg2
0= lcxd3T is not gated into lcxg2
LCxG2D3N: Gate 2 Data 3 Negated (inverted) bit
1= lcxd3N is gated into lcxg2
0= lcxd3N is not gated into lcxg2
LCxG2D2T: Gate 2 Data 2 True (non-inverted) bit
1= lcxd2T is gated into lcxg2
0= lcxd2T is not gated into lcxg2
LCxG2D2N: Gate 2 Data 2 Negated (inverted) bit
1= lcxd2N is gated into lcxg2
0= lcxd2N is not gated into lcxg2
LCxG2D1T: Gate 2 Data 1 True (non-inverted) bit
1= lcxd1T is gated into lcxg2
0= lcxd1T is not gated into lcxg2
LCxG2D1N: Gate 2 Data 1 Negated (inverted) bit
1= lcxd1N is gated into lcxg2
0= lcxd1N is not gated into lcxg2
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PIC16(L)F1508/9
REGISTER 24-7: CLCxGLS2: GATE 3 LOGIC SELECT REGISTER
R/W-x/u
R/W-x/u
R/W-x/u
R/W-x/u
R/W-x/u
R/W-x/u
R/W-x/u
R/W-x/u
LCxG3D4T
LCxG3D4N LCxG3D3T LCxG3D3N LCxG3D2T
LCxG3D2N
LCxG3D1T LCxG3D1N
bit 0
bit 7
Legend:
R = Readable bit
u = Bit is unchanged
‘1’ = Bit is set
W = Writable bit
x = Bit is unknown
‘0’ = Bit is cleared
U = Unimplemented bit, read as ‘0’
-n/n = Value at POR and BOR/Value at all other Resets
bit 7
bit 6
bit 5
bit 4
bit 3
bit 2
bit 1
bit 0
LCxG3D4T: Gate 3 Data 4 True (non-inverted) bit
1= lcxd4T is gated into lcxg3
0= lcxd4T is not gated into lcxg3
LCxG3D4N: Gate 3 Data 4 Negated (inverted) bit
1= lcxd4N is gated into lcxg3
0= lcxd4N is not gated into lcxg3
LCxG3D3T: Gate 3 Data 3 True (non-inverted) bit
1= lcxd3T is gated into lcxg3
0= lcxd3T is not gated into lcxg3
LCxG3D3N: Gate 3 Data 3 Negated (inverted) bit
1= lcxd3N is gated into lcxg3
0= lcxd3N is not gated into lcxg3
LCxG3D2T: Gate 3 Data 2 True (non-inverted) bit
1= lcxd2T is gated into lcxg3
0= lcxd2T is not gated into lcxg3
LCxG3D2N: Gate 3 Data 2 Negated (inverted) bit
1= lcxd2N is gated into lcxg3
0= lcxd2N is not gated into lcxg3
LCxG3D1T: Gate 3 Data 1 True (non-inverted) bit
1= lcxd1T is gated into lcxg3
0= lcxd1T is not gated into lcxg3
LCxG3D1N: Gate 3 Data 1 Negated (inverted) bit
1= lcxd1N is gated into lcxg3
0= lcxd1N is not gated into lcxg3
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PIC16(L)F1508/9
REGISTER 24-8: CLCxGLS3: GATE 4 LOGIC SELECT REGISTER
R/W-x/u
R/W-x/u
R/W-x/u
R/W-x/u
R/W-x/u
R/W-x/u
R/W-x/u
R/W-x/u
LCxG4D4T
LCxG4D4N LCxG4D3T LCxG4D3N LCxG4D2T
LCxG4D2N
LCxG4D1T LCxG4D1N
bit 0
bit 7
Legend:
R = Readable bit
u = Bit is unchanged
‘1’ = Bit is set
W = Writable bit
x = Bit is unknown
‘0’ = Bit is cleared
U = Unimplemented bit, read as ‘0’
-n/n = Value at POR and BOR/Value at all other Resets
bit 7
bit 6
bit 5
bit 4
bit 3
bit 2
bit 1
bit 0
LCxG4D4T: Gate 4 Data 4 True (non-inverted) bit
1= lcxd4T is gated into lcxg4
0= lcxd4T is not gated into lcxg4
LCxG4D4N: Gate 4 Data 4 Negated (inverted) bit
1= lcxd4N is gated into lcxg4
0= lcxd4N is not gated into lcxg4
LCxG4D3T: Gate 4 Data 3 True (non-inverted) bit
1= lcxd3T is gated into lcxg4
0= lcxd3T is not gated into lcxg4
LCxG4D3N: Gate 4 Data 3 Negated (inverted) bit
1= lcxd3N is gated into lcxg4
0= lcxd3N is not gated into lcxg4
LCxG4D2T: Gate 4 Data 2 True (non-inverted) bit
1= lcxd2T is gated into lcxg4
0= lcxd2T is not gated into lcxg4
LCxG4D2N: Gate 4 Data 2 Negated (inverted) bit
1= lcxd2N is gated into lcxg4
0= lcxd2N is not gated into lcxg4
LCxG4D1T: Gate 4 Data 1 True (non-inverted) bit
1= lcxd1T is gated into lcxg4
0= lcxd1T is not gated into lcxg4
LCxG4D1N: Gate 4 Data 1 Negated (inverted) bit
1= lcxd1N is gated into lcxg4
0= lcxd1N is not gated into lcxg4
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PIC16(L)F1508/9
REGISTER 24-9: CLCDATA: CLC DATA OUTPUT
U-0
—
U-0
—
U-0
—
U-0
—
R-0
R-0
R-0
R-0
MLC4OUT
MLC3OUT
MLC2OUT
MLC1OUT
bit 7
bit 0
Legend:
R = Readable bit
u = Bit is unchanged
‘1’ = Bit is set
W = Writable bit
x = Bit is unknown
‘0’ = Bit is cleared
U = Unimplemented bit, read as ‘0’
-n/n = Value at POR and BOR/Value at all other Resets
bit 7-4
bit 3
bit 2
bit 1
bit 0
Unimplemented: Read as ‘0’
MLC4OUT: Mirror copy of LC4OUT bit
MLC3OUT: Mirror copy of LC3OUT bit
MLC2OUT: Mirror copy of LC2OUT bit
MLC1OUT: Mirror copy of LC1OUT bit
2011-2013 Microchip Technology Inc.
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PIC16(L)F1508/9
TABLE 24-3: SUMMARY OF REGISTERS ASSOCIATED WITH CLCx
Register
on Page
Name
Bit7
Bit6
Bit5
Bit4
BIt3
Bit2
Bit1
Bit0
ANSELA
—
—
—
ANSB5
—
ANSA4
ANSB4
—
—
—
ANSA2
—
ANSA1
—
ANSA0
—
113
117
121
275
283
279
280
281
282
276
277
278
275
279
280
281
282
276
277
278
275
279
280
281
282
276
277
278
275
279
280
281
282
276
277
278
76
ANSELB
ANSELC
—
—
ANSC7
ANSC6
ANSC3
ANSC2
ANSC1
ANSC0
CLC1CON
CLCDATA
CLC1GLS0
CLC1GLS1
CLC1GLS2
LC1EN
—
LC1OE
—
LC1OUT
—
LC1INTP
—
LC1INTN
—
LC1MODE<2:0>
MLC2OUT
MLC3OUT
LC1G1D2N
LC1G2D2N
LC1G3D2N
LC1G4D2N
LC1G3POL
MLC1OUT
LC1G1D1N
LC1G2D1N
LC1G3D1N
LC1G4D1N
LC1G1POL
LC1G1D4T
LC1G2D4T
LC1G3D4T
LC1G1D4N
LC1G2D4N
LC1G3D4N
LC1G4D4N
—
LC1G1D3T
LC1G2D3T
LC1G3D3T
LC1G1D3N
LC1G2D3N
LC1G3D3N
LC1G4D3N
—
LC1G1D2T
LC1G2D2T
LC1G3D2T
LC1G1D1T
LC1G2D1T
LC1G3D1T
CLC1GLS3
CLC1POL
CLC1SEL0
LC1G4D4T
LC1POL
—
LC1G4D3T
—
LC1G4D2T
LC1G4POL
—
LC1G4D1T
LC1G2POL
LC1D2S<2:0>
LC1D1S<2:0>
CLC1SEL1
CLC2CON
CLC2GLS0
CLC2GLS1
CLC2GLS2
—
LC1D4S<2:0>
LC2OUT
—
LC1D3S<2:0>
LC2MODE<2:0>
LC2G1D1T
LC2EN
LC2OE
LC2G1D4N
LC2G2D4N
LC2G3D4N
LC2G4D4N
—
LC2INTP
LC2G1D3N
LC2G2D3N
LC2G3D3N
LC2G4D3N
—
LC2INTN
LC2G1D2T
LC2G2D2T
LC2G3D2T
LC2G1D4T
LC2G2D4T
LC2G3D4T
LC2G1D3T
LC2G2D3T
LC2G3D3T
LC2G1D2N
LC2G2D2N
LC2G3D2N
LC2G4D2N
LC2G3POL
LC2G1D1N
LC2G2D1N
LC2G3D1N
LC2G4D1N
LC2G1POL
LC2G2D1T
LC2G3D1T
CLC2GLS3
CLC2POL
CLC2SEL0
CLC2SEL1
LC2G4D4T
LC2G4D3T
—
LC2G4D2T
LC2G4D1T
LC2G2POL
LC2POL
LC2G4POL
—
—
LC2D2S<2:0>
LC2D4S<2:0>
—
—
LC2D1S<2:0>
LC2D3S<2:0>
CLC3CON
CLC3GLS0
CLC3GLS1
CLC3GLS2
CLC3GLS3
LC3EN
LC3OE
LC3G1D4N
LC3G2D4N
LC3G3D4N
LC3G4D4N
—
LC3OUT
LC3G1D3T
LC3G2D3T
LC3G3D3T
LC3G4D3T
LC3INTP
LC3G1D3N
LC3G2D3N
LC3G3D3N
LC3G4D3N
—
LC3INTN
LC3G1D2T
LC3G2D2T
LC3G3D2T
LC3G4D2T
LC3MODE<2:0>
LC3G1D1T
LC3G2D1T
LC3G3D1T
LC3G4D1T
LC3G1D4T
LC3G2D4T
LC3G3D4T
LC3G4D4T
LC3G1D2N
LC3G2D2N
LC3G3D2N
LC3G4D2N
LC3G3POL
LC3G1D1N
LC3G2D1N
LC3G3D1N
LC3G4D1N
LC3G1POL
CLC3POL
CLC3SEL0
CLC3SEL1
LC3POL
—
LC3G4POL
LC3G2POL
LC3D1S<2:0>
LC3D3S<2:0>
—
—
LC3D2S<2:0>
LC3D4S<2:0>
—
—
CLC4CON
CLC4GLS0
CLC4GLS1
LC4EN
LC4OE
LC4G1D4N
LC4G2D4N
LC4G3D4N
LC4G4D4N
—
LC4OUT
LC4G1D3T
LC4G2D3T
LC4INTP
LC4G1D3N
LC4G2D3N
LC4G3D3N
LC4G4D3N
—
LC4INTN
LC4G1D2T
LC4G2D2T
LC4MODE<2:0>
LC4G1D1T
LC4G1D4T
LC4G2D4T
LC4G1D2N
LC4G2D2N
LC4G3D2N
LC4G4D2N
LC4G3POL
LC4G1D1N
LC4G2D1N
LC4G3D1N
LC4G4D1N
LC4G1POL
LC4G2D1T
CLC4GLS2
CLC4GLS3
CLC4POL
CLC4SEL0
LC4G3D4T
LC4G4D4T
LC4POL
—
LC4G3D3T
LC4G4D3T
—
LC4G3D2T
LC4G4D2T
LC4G4POL
—
LC4G3D1T
LC4G4D1T
LC4G2POL
LC4D1S<2:0>
LC4D2S<2:0>
CLC4SEL1
INTCON
PIE3
—
LC4D4S<2:0>
—
LC4D3S<2:0>
GIE
—
PEIE
—
TMR0IE
—
INTE
—
IOCIE
TMR0IF
CLC3IE
INTF
IOCIF
CLC4IE
CLC2IE
CLC1IE
79
—
—
—
—
CLC4IF
CLC3IF
TRISA2
—
CLC2IF
TRISA1
—
CLC1IF
TRISA0
—
PIR3
82
(1)
—
—
TRISA5
TRISB5
TRISC5
TRISA4
TRISB4
TRISC4
—
TRISA
TRISB
TRISC
112
116
120
TRISB7
TRISC7
TRISB6
TRISC6
—
TRISC3
TRISC2
TRISC1
TRISC0
Legend:
Note 1:
— = unimplemented read as ‘0’,. Shaded cells are not used for CLC module.
Unimplemented, read as ‘1’.
DS40001609B-page 284
2011-2013 Microchip Technology Inc.
PIC16(L)F1508/9
25.1.2
ACCUMULATOR
25.0 NUMERICALLY CONTROLLED
OSCILLATOR (NCO) MODULE
The accumulator is a 20-bit register. Read and write
access to the accumulator is available through three
registers:
The Numerically Controlled Oscillator (NCOx) module
is a timer that uses the overflow from the addition of an
increment value to divide the input frequency. The
advantage of the addition method over simple counter
driven timer is that the resolution of division does not
vary with the divider value. The NCOx is most useful for
applications that require frequency accuracy and fine
resolution at a fixed duty cycle.
• NCOxACCL
• NCOxACCH
• NCOxACCU
25.1.3
ADDER
The NCOx adder is a full adder, which operates
independently from the system clock. The addition of the
previous result and the increment value replaces the
accumulator value on the rising edge of each input clock.
Features of the NCOx include:
• 16-bit increment function
• Fixed Duty Cycle (FDC) mode
• Pulse Frequency (PF) mode
• Output pulse width control
• Multiple clock input sources
• Output polarity control
25.1.4
INCREMENT REGISTERS
The increment value is stored in two 8-bit registers
making up a 16-bit increment. In order of LSB to MSB
they are:
• Interrupt capability
• NCOxINCL
• NCOxINCH
Figure 25-1 is a simplified block diagram of the NCOx
module.
When the NCO module is enabled, the NCOxINCH
should be written first, then the NCOxINCL register.
Writing to the NCOxINCL register initiates the incre-
ment buffer registers to be loaded simultaneously on
the second rising edge of the NCOx_clk signal.
25.1 NCOx Operation
The NCOx operates by repeatedly adding a fixed value
to an accumulator. Additions occur at the input clock rate.
The accumulator will overflow with a carry periodically,
which is the raw NCOx output (NCO_overflow). This
effectively reduces the input clock by the ratio of the
addition value to the maximum accumulator value. See
Equation 25-1.
The registers are readable and writable. The increment
registers are double-buffered to allow value changes to
be made without first disabling the NCOx module.
When the NCO module is disabled, the increment
buffers are loaded immediately after a write to the
increment registers.
The NCOx output can be further modified by stretching
the pulse or toggling a flip-flop. The modified NCOx
output is then distributed internally to other peripherals
and optionally output to a pin. The accumulator
overflow also generates an interrupt (NCO_interrupt).
Note: The increment buffer registers are not
user-accessible.
The NCOx period changes in discrete steps to create
an average frequency. This output depends on the
ability of the receiving circuit (i.e., CWG or external
resonant converter circuitry) to average the NCOx
output to reduce uncertainty.
25.1.1
NCOx CLOCK SOURCES
Clock sources available to the NCOx include:
• HFINTOSC
• FOSC
• LC1_out
• CLKIN pin
The NCOx clock source is selected by configuring the
NxCKS<2:0> bits in the NCOxCLK register.
EQUATION 25-1:
NCO Clock Frequency Increment Value
FOVERFLOW= ---------------------------------------------------------------------------------------------------------------
2n
n = Accumulator width in bits
2011-2013 Microchip Technology Inc.
DS40001609B-page 285
FIGURE 25-1:
NUMERICALLY CONTROLLED OSCILLATOR (NCOx) MODULE SIMPLIFIED BLOCK DIAGRAM
Rev. 10-000028A_A0
NCOxINCH NCOxINCL
16
(1)
INCBUFH INCBUFL
16
20
NCO_overflow
Adder
20
HFINTOSC
00
01
10
FOSC
NCOx_clk
NCOxACCU NCOxACCH NCOxACCL
20
LCx_out
NCO1CLK
NxCKS<1:0>
11
NCO_interrupt
set bit
NCOxIF
2
Fixed Duty
Cycle Mode
Circuitry
NxOE
D
Q
D
Q
0
1
TRIS bit
NCOx
_
Q
NxPFM
NxPOL
NCOx_out
To Peripherals
NxOUT
S
Q
EN
D
Q
_
Q
Ripple
Counter
R
Q1
Pulse
R
Frequency
Mode Circuitry
3
NxPWS<2:0>
Note 1:
The increment registers are double-buffered to allow for value changes to be made without first disabling the NCO module. The full increment value is loaded into the buffer registers on the
second rising edge of the NCOx_clk signal that occurs immediately after a write to NCOxINCL register. The buffers are not user-accessible and are shown here for reference.
PIC16(L)F1508/9
25.2 Fixed Duty Cycle (FDC) Mode
25.5 Interrupts
In Fixed Duty Cycle (FDC) mode, every time the
accumulator overflows (NCO_overflow), the output is
toggled. This provides a 50% duty cycle, provided that
the increment value remains constant. For more
information, see Figure 25-2.
When the accumulator overflows (NCO_overflow), the
NCOx Interrupt Flag bit, NCOxIF, of the PIRx register is
set. To enable the interrupt event (NCO_interrupt), the
following bits must be set:
• NxEN bit of the NCOxCON register
• NCOxIE bit of the PIEx register
• PEIE bit of the INTCON register
• GIE bit of the INTCON register
The FDC mode is selected by clearing the NxPFM bit
in the NCOxCON register.
25.3 Pulse Frequency (PF) Mode
The interrupt must be cleared by software by clearing
the NCOxIF bit in the Interrupt Service Routine.
In Pulse Frequency (PF) mode, every time the accumu-
lator overflows (NCO_overflow), the output becomes
active for one or more clock periods. Once the clock
period expires, the output returns to an inactive state.
This provides a pulsed output.
25.6 Effects of a Reset
All of the NCOx registers are cleared to zero as the
result of a Reset.
The output becomes active on the rising clock edge
immediately following the overflow event. For more
information, see Figure 25-2.
25.7 Operation In Sleep
The NCO module operates independently from the
system clock and will continue to run during Sleep,
provided that the clock source selected remains
active.
The value of the active and inactive states depends on
the polarity bit, NxPOL in the NCOxCON register.
The PF mode is selected by setting the NxPFM bit in
the NCOxCON register.
The HFINTOSC remains active during Sleep when the
NCO module is enabled and the HFINTOSC is
selected as the clock source, regardless of the system
clock source selected.
25.3.1
OUTPUT PULSE WIDTH CONTROL
When operating in PF mode, the active state of the out-
put can vary in width by multiple clock periods. Various
pulse widths are selected with the NxPWS<2:0> bits in
the NCOxCLK register.
In other words, if the HFINTOSC is simultaneously
selected as the system clock and the NCO clock
source, when the NCO is enabled, the CPU will go idle
during Sleep, but the NCO will continue to operate and
the HFINTOSC will remain active.
When the selected pulse width is greater than the
accumulator overflow time frame, the output of the
NCOx operation is indeterminate.
This will have a direct effect on the Sleep mode current.
25.4 Output Polarity Control
The last stage in the NCOx module is the output polar-
ity. The NxPOL bit in the NCOxCON register selects the
output polarity. Changing the polarity while the inter-
rupts are enabled will cause an interrupt for the result-
ing output transition.
25.8 Alternate Pin Locations
This module incorporates I/O pins that can be moved to
other locations with the use of the alternate pin function
register, APFCON. To determine which pins can be
moved and what their default locations are upon a
Reset, see Section 11.1 “Alternate Pin Function” for
more information.
The NCOx output can be used internally by source
code or other peripherals. Accomplish this by reading
the NxOUT (read-only) bit of the NCOxCON register.
The NCOx output signal is available to the following
peripherals:
• CLC
• CWG
2011-2013 Microchip Technology Inc.
DS40001609B-page 287
FIGURE 25-2:
NCO – FIXED DUTY CYCLE (FDC) AND PULSE FREQUENCY MODE (PFM) OUTPUT OPERATION DIAGRAM
Rev. 10-000029A_A0
NCOx
Clock
Source
NCOx
Increment
Value
4000h
4000h
4000h
NCOx
Accumulator
Value
00000h 04000h 08000h
FC000h 00000h 04000h 08000h
FC000h 00000h 04000h 08000h
NCO_overflow
NCO_interrupt
NCOx Output
FDC Mode
NCOx Output
PF Mode
NCOxPWS =
000
NCOx Output
PF Mode
NCOxPWS =
001
PIC16(L)F1508/9
25.9 Register Definitions: NCOx Control Registers
REGISTER 25-1: NCOxCON: NCOx CONTROL REGISTER
R/W-0/0
NxEN
R/W-0/0
NxOE
R-0/0
R/W-0/0
NxPOL
U-0
—
U-0
—
U-0
—
R/W-0/0
NxPFM
NxOUT
bit 7
bit 0
Legend:
R = Readable bit
u = Bit is unchanged
‘1’ = Bit is set
W = Writable bit
x = Bit is unknown
‘0’ = Bit is cleared
U = Unimplemented bit, read as ‘0’
-n/n = Value at POR and BOR/Value at all other Resets
bit 7
bit 6
bit 5
bit 4
NxEN: NCOx Enable bit
1= NCOx module is enabled
0= NCOx module is disabled
NxOE: NCOx Output Enable bit
1= NCOx output pin is enabled
0= NCOx output pin is disabled
NxOUT: NCOx Output bit
1= NCOx output is high
0= NCOx output is low
NxPOL: NCOx Polarity bit
1= NCOx output signal is active low (inverted)
0= NCOx output signal is active high (non-inverted)
bit 3-1
bit 0
Unimplemented: Read as ‘0’
NxPFM: NCOx Pulse Frequency Mode bit
1= NCOx operates in Pulse Frequency mode
0= NCOx operates in Fixed Duty Cycle mode
REGISTER 25-2: NCOxCLK: NCOx INPUT CLOCK CONTROL REGISTER
R/W-0/0
R/W-0/0
NxPWS<2:0>(1, 2)
R/W-0/0
U-0
—
U-0
—
U-0
—
R/W-0/0
R/W-0/0
NxCKS<1:0>
bit 7
bit 0
Legend:
R = Readable bit
u = Bit is unchanged
‘1’ = Bit is set
W = Writable bit
x = Bit is unknown
‘0’ = Bit is cleared
U = Unimplemented bit, read as ‘0’
-n/n = Value at POR and BOR/Value at all other Resets
bit 7-5
NxPWS<2:0>: NCOx Output Pulse Width Select bits(1, 2)
111= 128 NCOx clock periods
110= 64 NCOx clock periods
101= 32 NCOx clock periods
100= 16 NCOx clock periods
011= 8 NCOx clock periods
010= 4 NCOx clock periods
001= 2 NCOx clock periods
000= 1 NCOx clock periods
bit 4-2
bit 1-0
Unimplemented: Read as ‘0’
NxCKS<1:0>: NCOx Clock Source Select bits
11= NCO1CLK pin
10= LC1_out
01= FOSC
00= HFINTOSC (16 MHz)
Note 1: NxPWS applies only when operating in Pulse Frequency mode.
2: If NCOx pulse width is greater than NCO_overflow period, operation is undeterminate.
2011-2013 Microchip Technology Inc.
DS40001609B-page 289
PIC16(L)F1508/9
REGISTER 25-3: NCOxACCL: NCOx ACCUMULATOR REGISTER – LOW BYTE
R/W-0/0
bit 7
R/W-0/0
R/W-0/0
R/W-0/0
R/W-0/0
R/W-0/0
R/W-0/0
R/W-0/0
bit 0
NCOxACC<7:0>
Legend:
R = Readable bit
W = Writable bit
U = Unimplemented bit, read as ‘0’
-n/n = Value at POR and BOR/Value at all other Resets
u = Bit is unchanged
‘1’ = Bit is set
x = Bit is unknown
‘0’ = Bit is cleared
bit 7-0
NCOxACC<7:0>: NCOx Accumulator, Low Byte
REGISTER 25-4: NCOxACCH: NCOx ACCUMULATOR REGISTER – HIGH BYTE
R/W-0/0
bit 7
R/W-0/0
R/W-0/0
R/W-0/0
R/W-0/0
R/W-0/0
R/W-0/0
R/W-0/0
bit 0
NCOxACC<15:8>
Legend:
R = Readable bit
W = Writable bit
U = Unimplemented bit, read as ‘0’
-n/n = Value at POR and BOR/Value at all other Resets
u = Bit is unchanged
‘1’ = Bit is set
x = Bit is unknown
‘0’ = Bit is cleared
bit 7-0
NCOxACC<15:8>: NCOx Accumulator, High Byte
REGISTER 25-5: NCOxACCU: NCOx ACCUMULATOR REGISTER – UPPER BYTE
U-0
—
U-0
—
U-0
—
U-0
—
R/W-0/0
R/W-0/0
R/W-0/0
R/W-0/0
NCOxACC<19:16>
bit 7
bit 0
Legend:
R = Readable bit
W = Writable bit
x = Bit is unknown
‘0’ = Bit is cleared
U = Unimplemented bit, read as ‘0’
-n/n = Value at POR and BOR/Value at all other Resets
u = Bit is unchanged
‘1’ = Bit is set
bit 7-4
bit 3-0
Unimplemented: Read as ‘0’
NCOxACC<19:16>: NCOx Accumulator, Upper Byte
DS40001609B-page 290
2011-2013 Microchip Technology Inc.
PIC16(L)F1508/9
(1)
REGISTER 25-6: NCOxINCL: NCOx INCREMENT REGISTER – LOW BYTE
R/W-0/0
R/W-0/0
R/W-0/0
R/W-0/0
R/W-0/0
R/W-0/0
R/W-0/0
R/W-1/1
bit 0
NCOxINC<7:0>
bit 7
Legend:
R = Readable bit
W = Writable bit
U = Unimplemented bit, read as ‘0’
-n/n = Value at POR and BOR/Value at all other Resets
u = Bit is unchanged
‘1’ = Bit is set
x = Bit is unknown
‘0’ = Bit is cleared
bit 7-0
NCOxINC<7:0>: NCOx Increment, Low Byte
Note 1: Write the NCOxINCH register first, then the NCOxINCL register. See 25.1.4 “Increment Registers” for
more information.
(1)
REGISTER 25-7: NCOxINCH: NCOx INCREMENT REGISTER – HIGH BYTE
R/W-0/0
R/W-0/0
R/W-0/0
R/W-0/0
R/W-0/0
R/W-0/0
R/W-0/0
R/W-0/0
NCOxINC<15:8>
bit 7
bit 0
Legend:
R = Readable bit
W = Writable bit
U = Unimplemented bit, read as ‘0’
-n/n = Value at POR and BOR/Value at all other Resets
u = Bit is unchanged
‘1’ = Bit is set
x = Bit is unknown
‘0’ = Bit is cleared
bit 7-0
NCOxINC<15:8>: NCOx Increment, High Byte
Note 1: Write the NCOxINCH register first, then the NCOxINCL register. See 25.1.4 “Increment Registers” for
more information.
TABLE 25-1: SUMMARY OF REGISTERS ASSOCIATED WITH NCOx
Register
on Page
Name
Bit 7
Bit 6
Bit 5
Bit 4
Bit 3
Bit 2
Bit 1
Bit 0
—
SSSEL
INTE
T1GSEL
IOCIE
APFCON
INTCON
NCO1ACCH
NCO1ACCL
NCO1ACCU
NCO1CLK
NCO1CON
NCO1INCH
NCO1INCL
PIE2
—
—
—
CLC1SEL NCO1SEL
110
76
GIE
PEIE
TMR0IE
TMR0IF
INTF
IOCIF
NCO1ACC<15:8>
NCO1ACC<7:0>
290
290
290
289
289
291
291
78
—
NCO1ACC<19:16>
N1PWS<2:0>
N1OE
—
—
—
—
—
N1CKS<1:0>
N1EN
N1OUT
N1POL
—
N1PFM
NCO1INC<15:8>
NCO1INC<7:0>
OSFIE
OSFIF
—
C2IE
C2IF
C1IE
C1IF
—
BCL1IE
BCL1IF
NCO1IE
NCO1IF
TRISA2
TRISC2
—
—
—
—
—
PIR2
81
(1)
TRISA
—
TRISA5
TRISC5
TRISA4
TRISC4
—
TRISA1
TRISC1
TRISA0
TRISC0
112
120
TRISC
TRISC7
TRISC6
TRISC3
Legend:
x= unknown, u= unchanged, —= unimplemented read as ‘0’, q= value depends on condition. Shaded cells are not
used for NCOx module.
Note 1: Unimplemented, read as ‘1’.
2011-2013 Microchip Technology Inc.
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PIC16(L)F1508/9
NOTES:
DS40001609B-page 292
2011-2013 Microchip Technology Inc.
PIC16(L)F1508/9
26.3 Selectable Input Sources
26.0 COMPLEMENTARY WAVEFORM
GENERATOR (CWG) MODULE
The CWG generates the output waveforms from the
input sources in Table 26-1.
The Complementary Waveform Generator (CWG)
produces a complementary waveform with dead-band
delay from a selection of input sources.
TABLE 26-1: SELECTABLE INPUT
SOURCES
The CWG module has the following features:
• Selectable dead-band clock source control
• Selectable input sources
Source Peripheral
Signal Name
C1OUT_sync
Comparator C1
Comparator C2
PWM1
• Output enable control
C2OUT_sync
PWM1_out
PWM2_out
PWM3_out
PWM4_out
NCO1_out
LC1_out
• Output polarity control
• Dead-band control with independent 6-bit rising
and falling edge dead-band counters
PWM2
PWM3
• Auto-shutdown control with:
- Selectable shutdown sources
- Auto-restart enable
PWM4
NCO1
- Auto-shutdown pin override control
CLC1
The input sources are selected using the GxIS<2:0>
bits in the CWGxCON1 register (Register 26-2).
26.1 Fundamental Operation
The CWG generates two output waveforms from the
selected input source.
26.4 Output Control
The off-to-on transition of each output can be delayed
from the on-to-off transition of the other output, thereby,
creating a time delay immediately where neither output
is driven. This is referred to as dead time and is covered
in Section 26.5 “Dead-Band Control”. A typical
operating waveform, with dead band, generated from a
single input signal is shown in Figure 26-2.
Immediately after the CWG module is enabled, the
complementary drive is configured with both CWGxA
and CWGxB drives cleared.
26.4.1
OUTPUT ENABLES
Each CWG output pin has individual output enable
control. Output enables are selected with the GxOEA
and GxOEB bits of the CWGxCON0 register. When an
output enable control is cleared, the module asserts no
control over the pin. When an output enable is set, the
override value or active PWM waveform is applied to
the pin per the port priority selection. The output pin
enables are dependent on the module enable bit,
GxEN. When GxEN is cleared, CWG output enables
and CWG drive levels have no effect.
It may be necessary to guard against the possibility of
circuit faults or a feedback event arriving too late or not
at all. In this case, the active drive must be terminated
before the Fault condition causes damage. This is
referred to as auto-shutdown and is covered in
Section 26.9 “Auto-Shutdown Control”.
26.2 Clock Source
The CWG module allows the following clock sources
to be selected:
26.4.2
POLARITY CONTROL
The polarity of each CWG output can be selected
independently. When the output polarity bit is set, the
corresponding output is active-high. Clearing the output
polarity bit configures the corresponding output as
active-low. However, polarity does not affect the
override levels. Output polarity is selected with the
GxPOLA and GxPOLB bits of the CWGxCON0 register.
• Fosc (system clock)
• HFINTOSC (16 MHz only)
The clock sources are selected using the G1CS0 bit of
the CWGxCON0 register (Register 26-1).
2011-2013 Microchip Technology Inc.
DS40001609B-page 293
FIGURE 26-1:
SIMPLIFIED CWG BLOCK DIAGRAM
2
GxASDLA
00
10
11
1
GxCS
FOSC
‘0’
‘1’
GxASDLA = 01
cwg_clock
GxOEA
CWGxDBR
6
HFINTOSC
1
3
EN
R
=
=
GxIS
0
TRISx
TRISx
CWGxA
S
R
Q
Q
C1OUT_async
C2OUT_async
PWM1_out
PWM2_out
PWM3_out
PWM4_out
NCO1_out
LC1_out
GxPOLA
Input Source
CWGxDBF
6
GxOEB
EN
R
0
1
GxPOLB
CWGxB
GxASDLB = 01
00
10
11
‘0’
‘1’
CWG1FLT (INT pin)
GxASDFLT
C1OUT_async
GxASDC1
C2OUT_async
GxASDC2
GxASE
shutdown
GxASDLB
Auto-Shutdown
Source
2
S
S
R
Q
Q
D
Q
LC2_out
GxASCLC
GxASE Data Bit
WRITE
GxARSEN
set dominate
x = CWG module number
PIC16(L)F1508/9
FIGURE 26-2:
TYPICAL CWG OPERATION WITH PWM1 (NO AUTO-SHUTDOWN)
cwg_clock
PWM1
CWGxA
Rising Edge
Dead Band
Rising Edge Dead Band
Falling Edge Dead Band
Rising Edge D
Falling Edge Dead Band
CWGxB
26.5 Dead-Band Control
26.7 Falling Edge Dead Band
Dead-band control provides for non-overlapping output
signals to prevent shoot-through current in power
switches. The CWG contains two 6-bit dead-band
counters. One dead-band counter is used for the rising
edge of the input source control. The other is used for
the falling edge of the input source control.
The falling edge dead band delays the turn-on of the
CWGxB output from when the CWGxA output is turned
off. The falling edge dead-band time starts when the
falling edge of the input source goes true. When this
happens, the CWGxA output is immediately turned off
and the falling edge dead-band delay time starts. When
the falling edge dead-band delay time is reached, the
CWGxB output is turned on.
Dead band is timed by counting CWG clock periods
from zero up to the value in the rising or falling dead-
band counter registers. See CWGxDBR and
CWGxDBF registers (Register 26-4 and Register 26-5,
respectively).
The CWGxDBF register sets the duration of the dead-
band interval on the falling edge of the input source sig-
nal. This duration is from 0 to 64 counts of dead band.
Dead band is always counted off the edge on the input
source signal. A count of 0 (zero), indicates that no
dead band is present.
26.6 Rising Edge Dead Band
The rising edge dead-band delays the turn-on of the
CWGxA output from when the CWGxB output is turned
off. The rising edge dead-band time starts when the
rising edge of the input source signal goes true. When
this happens, the CWGxB output is immediately turned
off and the rising edge dead-band delay time starts.
When the rising edge dead-band delay time is reached,
the CWGxA output is turned on.
If the input source signal is not present for enough time
for the count to be completed, no output will be seen on
the respective output.
Refer to Figure 26-3 and Figure 26-4 for examples.
The CWGxDBR register sets the duration of the dead-
band interval on the rising edge of the input source
signal. This duration is from 0 to 64 counts of dead band.
Dead band is always counted off the edge on the input
source signal. A count of 0 (zero), indicates that no
dead band is present.
If the input source signal is not present for enough time
for the count to be completed, no output will be seen on
the respective output.
2011-2013 Microchip Technology Inc.
DS40001609B-page 295
FIGURE 26-3:
DEAD-BAND OPERATION, CWGxDBR = 01H, CWGxDBF = 02H
cwg_clock
Input Source
CWGxA
CWGxB
FIGURE 26-4:
DEAD-BAND OPERATION, CWGxDBR = 03H, CWGxDBF = 04H, SOURCE SHORTER THAN DEAD BAND
cwg_clock
Input Source
CWGxA
CWGxB
source shorter than dead band
PIC16(L)F1508/9
26.8 Dead-Band Uncertainty
26.9 Auto-Shutdown Control
When the rising and falling edges of the input source
triggers the dead-band counters, the input may be asyn-
chronous. This will create some uncertainty in the dead-
band time delay. The maximum uncertainty is equal to
one CWG clock period. Refer to Equation 26-1 for more
detail.
Auto-shutdown is a method to immediately override the
CWG output levels with specific overrides that allow for
safe shutdown of the circuit. The shutdown state can
be either cleared automatically or held until cleared by
software.
26.9.1
SHUTDOWN
EQUATION 26-1: DEAD-BAND
UNCERTAINTY
The shutdown state can be entered by either of the
following two methods:
• Software generated
• External Input
1
TDEADBAND_UNCERTAINTY = ----------------------------
Fcwg_clock
26.9.1.1
Software Generated Shutdown
Setting the GxASE bit of the CWGxCON2 register will
force the CWG into the shutdown state.
When auto-restart is disabled, the shutdown state will
persist as long as the GxASE bit is set.
Example:
When auto-restart is enabled, the GxASE bit will clear
automatically and resume operation on the next rising
edge event. See Figure 26-6.
Fcwg_clock = 16 MHz
26.9.1.2
External Input Source
External shutdown inputs provide the fastest way to
safely suspend CWG operation in the event of a Fault
condition. When any of the selected shutdown inputs
goes active, the CWG outputs will immediately go to
the selected override levels without software delay. Any
combination of two input sources can be selected to
cause a shutdown condition. The sources are:
Therefore:
1
TDEADBAND_UNCERTAINTY = ----------------------------
Fcwg_clock
• Comparator C1 – C1OUT_async
• Comparator C2 – C2OUT_async
• CLC2 – LC2_out
1
= ------------------
16 MHz
• CWG1FLT
= 62.5ns
Shutdown inputs are selected using the GxASDS0 and
GxASDS1 bits of the CWGxCON2 register.
(Register 26-3).
Note:
Shutdown inputs are level sensitive, not
edge sensitive. The shutdown state can-
not be cleared, except by disabling auto-
shutdown, as long as the shutdown input
level persists.
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PIC16(L)F1508/9
26.11.1 PIN OVERRIDE LEVELS
26.10 Operation During Sleep
The levels driven to the output pins, while the shutdown
input is true, are controlled by the GxASDLA and
GxASDLB bits of the CWGxCON2 register
(Register 26-3). GxASDLA controls the CWG1A
override level and GxASDLB controls the CWG1B
override level. The control bit logic level corresponds to
the output logic drive level while in the shutdown state.
The polarity control does not apply to the override level.
The CWG module operates independently from the
system clock and will continue to run during Sleep,
provided that the clock and input sources selected
remain active.
The HFINTOSC remains active during Sleep, provided
that the CWG module is enabled, the input source is
active, and the HFINTOSC is selected as the clock
source, regardless of the system clock source
selected.
26.11.2 AUTO-SHUTDOWN RESTART
After an auto-shutdown event has occurred, there are
two ways to have resume operation:
In other words, if the HFINTOSC is simultaneously
selected as the system clock and the CWG clock
source, when the CWG is enabled and the input
source is active, the CPU will go idle during Sleep, but
the CWG will continue to operate and the HFINTOSC
will remain active.
• Software controlled
• Auto-restart
The restart method is selected with the GxARSEN bit
of the CWGxCON2 register. Waveforms of software
controlled and automatic restarts are shown in
Figure 26-5 and Figure 26-6.
This will have a direct effect on the Sleep mode current.
26.11 Configuring the CWG
26.11.2.1 Software Controlled Restart
When the GxARSEN bit of the CWGxCON2 register is
cleared, the CWG must be restarted after an auto-shut-
down event by software.
The following steps illustrate how to properly configure
the CWG to ensure a synchronous start:
1. Ensure that the TRIS control bits corresponding
to CWGxA and CWGxB are set so that both are
configured as inputs.
Clearing the shutdown state requires all selected shut-
down inputs to be low, otherwise the GxASE bit will
remain set. The overrides will remain in effect until the
first rising edge event after the GxASE bit is cleared.
The CWG will then resume operation.
2. Clear the GxEN bit, if not already cleared.
3. Set desired dead-band times with the CWGxDBR
and CWGxDBF registers.
4. Setup the following controls in CWGxCON2
auto-shutdown register:
26.11.2.2 Auto-Restart
When the GxARSEN bit of the CWGxCON2 register is
set, the CWG will restart from the auto-shutdown state
automatically.
• Select desired shutdown source.
• Select both output overrides to the desired
levels (this is necessary even if not using
auto-shutdown because start-up will be from
a shutdown state).
The GxASE bit will clear automatically when all shut-
down sources go low. The overrides will remain in
effect until the first rising edge event after the GxASE
bit is cleared. The CWG will then resume operation.
• Set the GxASE bit and clear the GxARSEN
bit.
5. Select the desired input source using the
CWGxCON1 register.
6. Configure the following controls in CWGxCON0
register:
• Select desired clock source.
• Select the desired output polarities.
• Set the output enables for the outputs to be
used.
7. Set the GxEN bit.
8. Clear TRIS control bits corresponding to
CWGxA and CWGxB to be used to configure
those pins as outputs.
9. If auto-restart is to be used, set the GxARSEN
bit and the GxASE bit will be cleared automati-
cally. Otherwise, clear the GxASE bit to start the
CWG.
DS40001609B-page 298
2011-2013 Microchip Technology Inc.
FIGURE 26-5: SHUTDOWN FUNCTIONALITY, AUTO-RESTART DISABLED (GxARSEN = 0,GxASDLA = 01, GxASDLB = 01)
GxASE Cleared by Software
Shutdown Event Ceases
CWG Input
Source
Shutdown Source
GxASE
Tri-State (No Pulse)
Tri-State (No Pulse)
CWG1A
CWG1B
No Shutdown
Output Resumes
Shutdown
FIGURE 26-6:
SHUTDOWN FUNCTIONALITY, AUTO-RESTART ENABLED (GxARSEN = 1,GxASDLA = 01, GxASDLB = 01)
Shutdown Event Ceases
GxASE auto-cleared by hardware
CWG Input
Source
Shutdown Source
GxASE
CWG1A
Tri-State (No Pulse)
CWG1B
Tri-State (No Pulse)
Shutdown
No Shutdown
Output Resumes
PIC16(L)F1508/9
26.12 Register Definitions: CWG Control
REGISTER 26-1: CWGxCON0: CWG CONTROL REGISTER 0
R/W-0/0
GxEN
R/W-0/0
GxOEB
R/W-0/0
GxOEA
R/W-0/0
GxPOLB
R/W-0/0
GxPOLA
U-0
—
U-0
—
R/W-0/0
GxCS0
bit 7
bit 0
Legend:
R = Readable bit
W = Writable bit
U = Unimplemented bit, read as ‘0’
u = Bit is unchanged
‘1’ = Bit is set
x = Bit is unknown
‘0’ = Bit is cleared
-n/n = Value at POR and BOR/Value at all other Resets
q = Value depends on condition
bit 7
bit 6
bit 5
bit 4
bit 3
GxEN: CWGx Enable bit
1= Module is enabled
0= Module is disabled
GxOEB: CWGxB Output Enable bit
1= CWGxB is available on appropriate I/O pin
0= CWGxB is not available on appropriate I/O pin
GxOEA: CWGxA Output Enable bit
1= CWGxA is available on appropriate I/O pin
0= CWGxA is not available on appropriate I/O pin
GxPOLB: CWGxB Output Polarity bit
1= Output is inverted polarity
0= Output is normal polarity
GxPOLA: CWGxA Output Polarity bit
1= Output is inverted polarity
0= Output is normal polarity
bit 2-1
bit 0
Unimplemented: Read as ‘0’
GxCS0: CWGx Clock Source Select bit
1= HFINTOSC
0= FOSC
DS40001609B-page 300
2011-2013 Microchip Technology Inc.
PIC16(L)F1508/9
REGISTER 26-2: CWGxCON1: CWG CONTROL REGISTER 1
R/W-x/u
R/W-x/u
R/W-x/u
R/W-x/u
U-0
—
R/W-0/0
R/W-0/0
R/W-0/0
GxASDLB<1:0>
GxASDLA<1:0>
GxIS<2:0>
bit 7
bit 0
Legend:
R = Readable bit
W = Writable bit
U = Unimplemented bit, read as ‘0’
u = Bit is unchanged
‘1’ = Bit is set
x = Bit is unknown
‘0’ = Bit is cleared
-n/n = Value at POR and BOR/Value at all other Resets
q = Value depends on condition
bit 7-6
GxASDLB<1:0>: CWGx Shutdown State for CWGxB
When an auto shutdown event is present (GxASE = 1):
11= CWGxB pin is driven to ‘1’, regardless of the setting of the GxPOLB bit.
10= CWGxB pin is driven to ‘0’, regardless of the setting of the GxPOLB bit.
01= CWGxB pin is tri-stated
00= CWGxB pin is driven to its inactive state after the selected dead-band interval. GxPOLB still will
control the polarity of the output.
bit 5-4
GxASDLA<1:0>: CWGx Shutdown State for CWGxA
When an auto shutdown event is present (GxASE = 1):
11= CWGxA pin is driven to ‘1’, regardless of the setting of the GxPOLA bit.
10= CWGxA pin is driven to ‘0’, regardless of the setting of the GxPOLA bit.
01= CWGxA pin is tri-stated
00= CWGxA pin is driven to its inactive state after the selected dead-band interval. GxPOLA still will
control the polarity of the output.
bit 3
Unimplemented: Read as ‘0’
bit 2-0
GxIS<2:0>: CWGx Input Source Select bits
111= CLC1 – LC1_out
110= NCO1 – NCO1_out
101= PWM4 – PWM4_out
100= PWM3 – PWM3_out
011= PWM2 – PWM2_out
010= PWM1 – PWM1_out
001= Comparator C1 – C1OUT_async
000= Comparator C2 – C2OUT_async
2011-2013 Microchip Technology Inc.
DS40001609B-page 301
PIC16(L)F1508/9
REGISTER 26-3: CWGxCON2: CWG CONTROL REGISTER 2
R/W-0/0
GxASE
R/W-0/0
U-0
—
U-0
—
R/W-0/0
R/W-0/0
R/W-0/0
R/W-0/0
GxARSEN
GxASDC2
GxASDC1
GxASDFLT GxASDCLC2
bit 0
bit 7
Legend:
R = Readable bit
W = Writable bit
x = Bit is unknown
‘0’ = Bit is cleared
U = Unimplemented bit, read as ‘0’
u = Bit is unchanged
‘1’ = Bit is set
-n/n = Value at POR and BOR/Value at all other Resets
q = Value depends on condition
bit 7
bit 6
GxASE: Auto-Shutdown Event Status bit
1= An auto-shutdown event has occurred
0= No auto-shutdown event has occurred
GxARSEN: Auto-Restart Enable bit
1= Auto-restart is enabled
0= Auto-restart is disabled
bit 5-4
bit 3
Unimplemented: Read as ‘0’
GxASDC2: CWG Auto-shutdown on Comparator C2 Enable bit
1= Shutdown when Comparator C2 output (C2OUT_async) is high
0= Comparator C2 output has no effect on shutdown
bit 2
bit 1
bit 0
GxASDC1: CWG Auto-shutdown on Comparator C1 Enable bit
1= Shutdown when Comparator C1 output (C1OUT_async) is high
0= Comparator C1 output has no effect on shutdown
GxASDFLT: CWG Auto-shutdown on FLT Enable bit
1= Shutdown when CWG1FLT input is low
0= CWG1FLT input has no effect on shutdown
GxASDCLC2: CWG Auto-shutdown on CLC2 Enable bit
1= Shutdown when CLC2 output (LC2_out) is high
0= CLC2 output has no effect on shutdown
DS40001609B-page 302
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PIC16(L)F1508/9
REGISTER 26-4: CWGxDBR: COMPLEMENTARY WAVEFORM GENERATOR (CWGx) RISING
DEAD-BAND COUNT REGISTER
U-0
—
U-0
—
R/W-x/u
R/W-x/u
R/W-x/u
R/W-x/u
R/W-x/u
R/W-x/u
CWGxDBR<5:0>
bit 7
bit 0
Legend:
R = Readable bit
u = Bit is unchanged
‘1’ = Bit is set
W = Writable bit
U = Unimplemented bit, read as ‘0’
x = Bit is unknown
‘0’ = Bit is cleared
-n/n = Value at POR and BOR/Value at all other Resets
q = Value depends on condition
bit 7-6
bit 5-0
Unimplemented: Read as ‘0’
CWGxDBR<5:0>: Complementary Waveform Generator (CWGx) Rising Counts
11 1111= 63-64 counts of dead band
11 1110= 62-63 counts of dead band
00 0010= 2-3 counts of dead band
00 0001= 1-2 counts of dead band
00 0000= 0 counts of dead band
REGISTER 26-5: CWGxDBF: COMPLEMENTARY WAVEFORM GENERATOR (CWGx) FALLING
DEAD-BAND COUNT REGISTER
U-0
—
U-0
—
R/W-x/u
R/W-x/u
R/W-x/u
R/W-x/u
R/W-x/u
R/W-x/u
CWGxDBF<5:0>
bit 7
bit 0
Legend:
R = Readable bit
u = Bit is unchanged
‘1’ = Bit is set
W = Writable bit
U = Unimplemented bit, read as ‘0’
x = Bit is unknown
‘0’ = Bit is cleared
-n/n = Value at POR and BOR/Value at all other Resets
q = Value depends on condition
bit 7-6
bit 5-0
Unimplemented: Read as ‘0’
CWGxDBF<5:0>: Complementary Waveform Generator (CWGx) Falling Counts
11 1111= 63-64 counts of dead band
11 1110= 62-63 counts of dead band
00 0010= 2-3 counts of dead band
00 0001= 1-2 counts of dead band
00 0000= 0 counts of dead band. Dead-band generation is bypassed.
2011-2013 Microchip Technology Inc.
DS40001609B-page 303
PIC16(L)F1508/9
TABLE 26-2: SUMMARY OF REGISTERS ASSOCIATED WITH CWG
Register
on Page
Name
Bit 7
Bit 6
Bit 5
Bit 4
Bit 3
Bit 2
Bit 1
Bit 0
ANSELA
—
—
—
ANSA4
—
ANSA2
—
ANSA1
—
ANSA0
G1CS0
113
300
301
302
303
303
112
120
CWG1CON0
CWG1CON1
CWG1CON2
CWG1DBF
CWG1DBR
TRISA
G1EN
G1OEB
G1OEA G1POLB G1POLA
G1ASDLA<1:0>
G1ASDLB<1:0>
G1IS<1:0>
G1ASDSFLT G1ASDSCLC2
—
—
G1ASE
G1ARSEN
G1ASDC2 G1ASDC1
CWG1DBF<5:0>
—
—
—
—
—
—
CWG1DBR<5:0>
(1)
—
—
TRISA5
TRISC5
TRISA4
TRISC4
TRISA2
TRISC2
TRISA1
TRISC1
TRISA0
TRISC0
—
TRISC
TRISC7
TRISC6
TRISC3
Legend:
x= unknown, u= unchanged, –= unimplemented locations read as ‘0’. Shaded cells are not used by CWG.
Note 1: Unimplemented, read as ‘1’.
DS40001609B-page 304
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PIC16(L)F1508/9
27.3 Common Programming Interfaces
27.0 IN-CIRCUIT SERIAL
PROGRAMMING™ (ICSP™)
Connection to a target device is typically done through
an ICSP™ header. A commonly found connector on
development tools is the RJ-11 in the 6P6C (6-pin,
6-connector) configuration. See Figure 27-1.
ICSP™ programming allows customers to manufacture
circuit boards with unprogrammed devices. Programming
can be done after the assembly process allowing the
device to be programmed with the most recent firmware
or a custom firmware. Five pins are needed for ICSP™
programming:
FIGURE 27-1:
ICD RJ-11 STYLE
CONNECTOR INTERFACE
• ICSPCLK
• ICSPDAT
• MCLR/VPP
• VDD
ICSPDAT
• VSS
NC
2 4 6
VDD
In Program/Verify mode the program memory, user IDs
and the Configuration Words are programmed through
serial communications. The ICSPDAT pin is a bidirec-
tional I/O used for transferring the serial data and the
ICSPCLK pin is the clock input. For more information on
ICSP™ refer to the “PIC12(L)F1501/PIC16(L)F150X
Memory Programming Specification” (DS41573).
ICSPCLK
1 3
5
Target
PC Board
Bottom Side
VPP/MCLR
VSS
Pin Description*
1 = VPP/MCLR
2 = VDD Target
3 = VSS (ground)
4 = ICSPDAT
27.1 High-Voltage Programming Entry
Mode
The device is placed into High-Voltage Programming
Entry mode by holding the ICSPCLK and ICSPDAT
pins low then raising the voltage on MCLR/VPP to VIHH.
5 = ICSPCLK
6 = No Connect
27.2 Low-Voltage Programming Entry
Mode
Another connector often found in use with the PICkit™
programmers is a standard 6-pin header with 0.1 inch
spacing. Refer to Figure 27-2.
The Low-Voltage Programming Entry mode allows the
PIC® Flash MCUs to be programmed using VDD only,
without high voltage. When the LVP bit of Configuration
Words is set to ‘1’, the ICSP Low-Voltage Programming
Entry mode is enabled. To disable the Low-Voltage
ICSP mode, the LVP bit must be programmed to ‘0’.
Entry into the Low-Voltage Programming Entry mode
requires the following steps:
1. MCLR is brought to VIL.
2.
A
32-bit key sequence is presented on
ICSPDAT, while clocking ICSPCLK.
Once the key sequence is complete, MCLR must be
held at VIL for as long as Program/Verify mode is to be
maintained.
If low-voltage programming is enabled (LVP = 1), the
MCLR Reset function is automatically enabled and
cannot be disabled. See Section 6.5 “MCLR” for more
information.
The LVP bit can only be reprogrammed to ‘0’ by using
the High-Voltage Programming mode.
2011-2013 Microchip Technology Inc.
DS40001609B-page 305
PIC16(L)F1508/9
FIGURE 27-2:
PICkit™ PROGRAMMER STYLE CONNECTOR INTERFACE
Pin 1 Indicator
Pin Description*
1 = VPP/MCLR
2 = VDD Target
3 = VSS (ground)
4 = ICSPDAT
1
2
3
4
5
6
5 = ICSPCLK
6 = No Connect
*
The 6-pin header (0.100" spacing) accepts 0.025" square pins.
For additional interface recommendations, refer to your
specific device programmer manual prior to PCB
design.
It is recommended that isolation devices be used to
separate the programming pins from other circuitry.
The type of isolation is highly dependent on the specific
application and may include devices such as resistors,
diodes, or even jumpers. See Figure 27-3 for more
information.
FIGURE 27-3:
TYPICAL CONNECTION FOR ICSP™ PROGRAMMING
External
Programming
Signals
Device to be
Programmed
VDD
VDD
VDD
VPP
VSS
MCLR/VPP
VSS
Data
ICSPDAT
ICSPCLK
Clock
*
*
*
To Normal Connections
Isolation devices (as required).
*
DS40001609B-page 306
2011-2013 Microchip Technology Inc.
PIC16(L)F1508/9
28.1 Read-Modify-Write Operations
28.0 INSTRUCTION SET SUMMARY
Any instruction that specifies a file register as part of
the instruction performs a Read-Modify-Write (R-M-W)
operation. The register is read, the data is modified,
and the result is stored according to either the instruc-
tion, or the destination designator ‘d’. A read operation
is performed on a register even if the instruction writes
to that register.
Each instruction is a 14-bit word containing the opera-
tion code (opcode) and all required operands. The
opcodes are broken into three broad categories.
• Byte Oriented
• Bit Oriented
• Literal and Control
The literal and control category contains the most
varied instruction word format.
TABLE 28-1: OPCODE FIELD
DESCRIPTIONS
Table 28-3 lists the instructions recognized by the
MPASMTM assembler.
Field
Description
All instructions are executed within a single instruction
cycle, with the following exceptions, which may take
two or three cycles:
f
W
b
Register file address (0x00 to 0x7F)
Working register (accumulator)
Bit address within an 8-bit file register
Literal field, constant data or label
• Subroutine takes two cycles (CALL, CALLW)
• Returns from interrupts or subroutines take two
cycles (RETURN, RETLW, RETFIE)
k
x
Don’t care location (= 0or 1).
• Program branching takes two cycles (GOTO, BRA,
BRW, BTFSS, BTFSC, DECFSZ, INCSFZ)
• One additional instruction cycle will be used when
any instruction references an indirect file register
and the file select register is pointing to program
memory.
The assembler will generate code with x = 0.
It is the recommended form of use for
compatibility with all Microchip software tools.
d
Destination select; d = 0: store result in W,
d = 1: store result in file register f.
Default is d = 1.
One instruction cycle consists of 4 oscillator cycles; for
an oscillator frequency of 4 MHz, this gives a nominal
instruction execution rate of 1 MHz.
n
FSR or INDF number. (0-1)
mm
Pre-post increment-decrement mode
selection
All instruction examples use the format ‘0xhh’ to
represent a hexadecimal number, where ‘h’ signifies a
hexadecimal digit.
TABLE 28-2: ABBREVIATION
DESCRIPTIONS
Field
Description
PC
TO
C
Program Counter
Time-Out bit
Carry bit
DC
Z
Digit Carry bit
Zero bit
PD
Power-Down bit
2011-2013 Microchip Technology Inc.
DS40001609B-page 307
PIC16(L)F1508/9
FIGURE 28-1:
GENERAL FORMAT FOR
INSTRUCTIONS
Byte-oriented file register operations
13
8
7
6
0
OPCODE
d
f (FILE #)
d = 0for destination W
d = 1for destination f
f = 7-bit file register address
Bit-oriented file register operations
13 10 9
7 6
0
OPCODE
b (BIT #)
f (FILE #)
b = 3-bit bit address
f = 7-bit file register address
Literal and control operations
General
13
8
7
0
OPCODE
k (literal)
k = 8-bit immediate value
CALLand GOTOinstructions only
13 11 10
OPCODE
0
k (literal)
k = 11-bit immediate value
MOVLPinstruction only
13
7
6
0
0
OPCODE
k (literal)
k = 7-bit immediate value
MOVLBinstruction only
13
5 4
OPCODE
k (literal)
k = 5-bit immediate value
BRAinstruction only
13
9
8
0
OPCODE
k (literal)
k = 9-bit immediate value
FSR Offset instructions
13
7
6
5
0
0
OPCODE
n
k (literal)
n = appropriate FSR
k = 6-bit immediate value
FSRIncrement instructions
13
3
2
n
1
OPCODE
m (mode)
n = appropriate FSR
m = 2-bit mode value
OPCODE only
13
0
OPCODE
DS40001609B-page 308
2011-2013 Microchip Technology Inc.
PIC16(L)F1508/9
TABLE 28-3: PIC16(L)F1508/9 INSTRUCTION SET
14-Bit Opcode
Status
Mnemonic,
Description
Operands
Cycles
Notes
Affected
MSb
LSb
BYTE-ORIENTED FILE REGISTER OPERATIONS
ADDWF
ADDWFC f, d
ANDWF
ASRF
LSLF
f, d
Add W and f
Add with Carry W and f
AND W with f
Arithmetic Right Shift
Logical Left Shift
Logical Right Shift
Clear f
Clear W
Complement f
Decrement f
Increment f
Inclusive OR W with f
Move f
Move W to f
Rotate Left f through Carry
Rotate Right f through Carry
Subtract W from f
Subtract with Borrow W from f
Swap nibbles in f
Exclusive OR W with f
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
00 0111 dfff ffff C, DC, Z
11 1101 dfff ffff C, DC, Z
00 0101 dfff ffff Z
11 0111 dfff ffff C, Z
11 0101 dfff ffff C, Z
11 0110 dfff ffff C, Z
2
2
2
2
2
2
2
f, d
f, d
f, d
f, d
f
LSRF
CLRF
CLRW
COMF
DECF
INCF
IORWF
MOVF
MOVWF
RLF
RRF
SUBWF
SUBWFB f, d
SWAPF
XORWF
00 0001 lfff ffff
00 0001 0000 00xx
00 1001 dfff ffff
00 0011 dfff ffff
00 1010 dfff ffff
00 0100 dfff ffff
00 1000 dfff ffff
00 0000 1fff ffff
00 1101 dfff ffff
00 1100 dfff ffff
Z
Z
Z
Z
Z
Z
Z
–
f, d
f, d
f, d
f, d
f, d
f
f, d
f, d
f, d
2
2
2
2
2
2
2
2
2
2
2
2
C
C
00 0010 dfff ffff C, DC, Z
11 1011 dfff ffff C, DC, Z
00 1110 dfff ffff
f, d
f, d
00 0110 dfff ffff
Z
BYTE ORIENTED SKIP OPERATIONS
f, d
f, d
Decrement f, Skip if 0
Increment f, Skip if 0
1(2)
1(2)
00
00
1011 dfff ffff
1111 dfff ffff
1, 2
1, 2
DECFSZ
INCFSZ
BIT-ORIENTED FILE REGISTER OPERATIONS
f, b
f, b
Bit Clear f
Bit Set f
1
1
01
01
00bb bfff ffff
01bb bfff ffff
2
2
BCF
BSF
BIT-ORIENTED SKIP OPERATIONS
BTFSC
BTFSS
f, b
f, b
Bit Test f, Skip if Clear
Bit Test f, Skip if Set
1 (2)
1 (2)
01
01
10bb bfff ffff
11bb bfff ffff
1, 2
1, 2
LITERAL OPERATIONS
ADDLW
ANDLW
IORLW
MOVLB
MOVLP
MOVLW
SUBLW
XORLW
k
k
k
k
k
k
k
k
Add literal and W
AND literal with W
Inclusive OR literal with W
Move literal to BSR
Move literal to PCLATH
Move literal to W
1
1
1
1
1
1
1
1
11
11
11
00
11
11
11
11
1110 kkkk kkkk C, DC, Z
1001 kkkk kkkk
1000 kkkk kkkk
0000 001k kkkk
0001 1kkk kkkk
0000 kkkk kkkk
Z
Z
Subtract W from literal
Exclusive OR literal with W
1100 kkkk kkkk C, DC, Z
1010 kkkk kkkk
Z
Note 1: If the Program Counter (PC) is modified, or a conditional test is true, the instruction requires two cycles. The second cycle
is executed as a NOP.
2: If this instruction addresses an INDF register and the MSb of the corresponding FSR is set, this instruction will require one
additional instruction cycle.
2011-2013 Microchip Technology Inc.
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PIC16(L)F1508/9
TABLE 28-3: PIC16(L)F1508/9 INSTRUCTION SET (CONTINUED)
14-Bit Opcode
Mnemonic,
Operands
Status
Affected
Description
Cycles
Notes
MSb
LSb
CONTROL OPERATIONS
BRA
BRW
CALL
CALLW
GOTO
RETFIE
RETLW
RETURN
k
–
k
–
k
k
k
–
Relative Branch
Relative Branch with W
Call Subroutine
Call Subroutine with W
Go to address
Return from interrupt
Return with literal in W
Return from Subroutine
2
2
2
2
2
2
2
2
11
00
10
00
10
00
11
00
001k kkkk kkkk
0000 0000 1011
0kkk kkkk kkkk
0000 0000 1010
1kkk kkkk kkkk
0000 0000 1001
0100 kkkk kkkk
0000 0000 1000
INHERENT OPERATIONS
CLRWDT
NOP
OPTION
RESET
SLEEP
TRIS
–
–
–
–
–
f
Clear Watchdog Timer
No Operation
Load OPTION_REG register with W
Software device Reset
Go into Standby mode
Load TRIS register with W
1
1
1
1
1
1
00
00
00
00
00
00
0000 0110 0100 TO, PD
0000 0000 0000
0000 0110 0010
0000 0000 0001
0000 0110 0011 TO, PD
0000 0110 0fff
C-COMPILER OPTIMIZED
ADDFSR n, k
Add Literal k to FSRn
Move Indirect FSRn to W with pre/post inc/dec
modifier, mm
1
1
11 0001 0nkk kkkk
00 0000 0001 0nmm
kkkk
MOVIW
n mm
Z
Z
2, 3
k[n]
n mm
Move INDFn to W, Indexed Indirect.
Move W to Indirect FSRn with pre/post inc/dec
modifier, mm
1
1
11 1111 0nkk 1nmm
00 0000 0001 kkkk
2
2, 3
MOVWI
k[n]
Move W to INDFn, Indexed Indirect.
1
11 1111 1nkk
2
Note 1: If the Program Counter (PC) is modified, or a conditional test is true, the instruction requires two cycles. The second cycle
is executed as a NOP.
2: If this instruction addresses an INDF register and the MSb of the corresponding FSR is set, this instruction will require
one additional instruction cycle.
3: See Table in the MOVIW and MOVWI instruction descriptions.
DS40001609B-page 310
2011-2013 Microchip Technology Inc.
PIC16(L)F1508/9
28.2 Instruction Descriptions
ADDFSR
Add Literal to FSRn
ANDLW
AND literal with W
Syntax:
[ label ] ADDFSR FSRn, k
Syntax:
[ label ] ANDLW
0 k 255
k
Operands:
-32 k 31
n [ 0, 1]
Operands:
Operation:
Status Affected:
Description:
(W) .AND. (k) (W)
Operation:
FSR(n) + k FSR(n)
Z
Status Affected:
Description:
None
The contents of W register are
AND’ed with the 8-bit literal ‘k’. The
result is placed in the W register.
The signed 6-bit literal ‘k’ is added to
the contents of the FSRnH:FSRnL
register pair.
FSRn is limited to the range 0000h -
FFFFh. Moving beyond these bounds
will cause the FSR to wrap-around.
ANDWF
AND W with f
ADDLW
Add literal and W
Syntax:
[ label ] ANDWF f,d
Syntax:
[ label ] ADDLW
0 k 255
k
Operands:
0 f 127
d 0,1
Operands:
Operation:
Status Affected:
Description:
(W) + k (W)
C, DC, Z
Operation:
(W) .AND. (f) (destination)
Status Affected:
Description:
Z
The contents of the W register are
added to the 8-bit literal ‘k’ and the
result is placed in the W register.
AND the W register with register ‘f’. If
‘d’ is ‘0’, the result is stored in the W
register. If ‘d’ is ‘1’, the result is stored
back in register ‘f’.
ASRF
Arithmetic Right Shift
ADDWF
Add W and f
Syntax:
[ label ] ASRF f {,d}
Syntax:
[ label ] ADDWF f,d
Operands:
0 f 127
d [0,1]
Operands:
0 f 127
d 0,1
Operation:
(f<7>) dest<7>
(f<7:1>) dest<6:0>,
(f<0>) C,
Operation:
(W) + (f) (destination)
Status Affected:
Description:
C, DC, Z
Add the contents of the W register
with register ‘f’. If ‘d’ is ‘0’, the result is
stored in the W register. If ‘d’ is ‘1’, the
result is stored back in register ‘f’.
Status Affected:
Description:
C, Z
The contents of register ‘f’ are shifted
one bit to the right through the Carry
flag. The MSb remains unchanged. If
‘d’ is ‘0’, the result is placed in W. If ‘d’
is ‘1’, the result is stored back in
register ‘f’.
ADDWFC
ADD W and CARRY bit to f
C
register f
Syntax:
[ label ] ADDWFC
f {,d}
Operands:
0 f 127
d [0,1]
Operation:
(W) + (f) + (C) dest
Status Affected:
Description:
C, DC, Z
Add W, the Carry flag and data mem-
ory location ‘f’. If ‘d’ is ‘0’, the result is
placed in W. If ‘d’ is ‘1’, the result is
placed in data memory location ‘f’.
2011-2013 Microchip Technology Inc.
DS40001609B-page 311
PIC16(L)F1508/9
BTFSC
Bit Test f, Skip if Clear
BCF
Bit Clear f
Syntax:
[ label ] BTFSC f,b
Syntax:
[ label ] BCF f,b
Operands:
0 f 127
0 b 7
Operands:
0 f 127
0 b 7
Operation:
skip if (f<b>) = 0
Operation:
0 (f<b>)
Status Affected:
Description:
None
Status Affected:
Description:
None
If bit ‘b’ in register ‘f’ is ‘1’, the next
instruction is executed.
Bit ‘b’ in register ‘f’ is cleared.
If bit ‘b’, in register ‘f’, is ‘0’, the next
instruction is discarded, and a NOPis
executed instead, making this a
2-cycle instruction.
BTFSS
Bit Test f, Skip if Set
BRA
Relative Branch
Syntax:
[ label ] BTFSS f,b
Syntax:
[ label ] BRA label
[ label ] BRA $+k
Operands:
0 f 127
0 b < 7
Operands:
-256 label - PC + 1 255
-256 k 255
Operation:
skip if (f<b>) = 1
Operation:
(PC) + 1 + k PC
Status Affected:
Description:
None
Status Affected:
Description:
None
If bit ‘b’ in register ‘f’ is ‘0’, the next
instruction is executed.
If bit ‘b’ is ‘1’, then the next
instruction is discarded and a NOPis
executed instead, making this a
2-cycle instruction.
Add the signed 9-bit literal ‘k’ to the
PC. Since the PC will have incre-
mented to fetch the next instruction,
the new address will be PC + 1 + k.
This instruction is a 2-cycle instruc-
tion. This branch has a limited range.
BRW
Relative Branch with W
Syntax:
[ label ] BRW
None
Operands:
Operation:
Status Affected:
Description:
(PC) + (W) PC
None
Add the contents of W (unsigned) to
the PC. Since the PC will have incre-
mented to fetch the next instruction,
the new address will be PC + 1 + (W).
This instruction is a 2-cycle instruc-
tion.
BSF
Bit Set f
Syntax:
[ label ] BSF f,b
Operands:
0 f 127
0 b 7
Operation:
1 (f<b>)
Status Affected:
Description:
None
Bit ‘b’ in register ‘f’ is set.
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CALL
Call Subroutine
CLRWDT
Clear Watchdog Timer
Syntax:
[ label ] CALL
0 k 2047
k
Syntax:
[ label ] CLRWDT
Operands:
Operation:
Operands:
Operation:
None
(PC)+ 1 TOS,
k PC<10:0>,
(PCLATH<6:3>) PC<14:11>
00h WDT
0 WDT prescaler,
1 TO
1 PD
Status Affected:
Description:
None
Status Affected:
Description:
TO, PD
Call Subroutine. First, return address
(PC + 1) is pushed onto the stack.
The 11-bit immediate address is
loaded into PC bits <10:0>. The upper
bits of the PC are loaded from
PCLATH. CALLis a 2-cycle instruc-
tion.
CLRWDTinstruction resets the Watch-
dog Timer. It also resets the prescaler
of the WDT.
Status bits TO and PD are set.
COMF
Complement f
CALLW
Subroutine Call With W
Syntax:
[ label ] COMF f,d
Syntax:
[ label ] CALLW
Operands:
0 f 127
d [0,1]
Operands:
Operation:
None
(PC) +1 TOS,
(W) PC<7:0>,
Operation:
(f) (destination)
(PCLATH<6:0>) PC<14:8>
Status Affected:
Description:
Z
The contents of register ‘f’ are com-
plemented. If ‘d’ is ‘0’, the result is
stored in W. If ‘d’ is ‘1’, the result is
stored back in register ‘f’.
Status Affected:
Description:
None
Subroutine call with W. First, the
return address (PC + 1) is pushed
onto the return stack. Then, the con-
tents of W is loaded into PC<7:0>,
and the contents of PCLATH into
PC<14:8>. CALLWis a 2-cycle
instruction.
DECF
Decrement f
CLRF
Clear f
Syntax:
[ label ] DECF f,d
Syntax:
[ label ] CLRF
0 f 127
f
Operands:
0 f 127
d [0,1]
Operands:
Operation:
00h (f)
1 Z
Operation:
(f) - 1 (destination)
Status Affected:
Description:
Z
Status Affected:
Description:
Z
Decrement register ‘f’. If ‘d’ is ‘0’, the
result is stored in the W
The contents of register ‘f’ are cleared
and the Z bit is set.
register. If ‘d’ is ‘1’, the result is stored
back in register ‘f’.
CLRW
Clear W
Syntax:
[ label ] CLRW
Operands:
Operation:
None
00h (W)
1 Z
Status Affected:
Description:
Z
W register is cleared. Zero bit (Z) is
set.
2011-2013 Microchip Technology Inc.
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PIC16(L)F1508/9
DECFSZ
Decrement f, Skip if 0
INCFSZ
Increment f, Skip if 0
Syntax:
[ label ] DECFSZ f,d
Syntax:
[ label ] INCFSZ f,d
Operands:
0 f 127
d [0,1]
Operands:
0 f 127
d [0,1]
Operation:
(f) - 1 (destination);
skip if result = 0
Operation:
(f) + 1 (destination),
skip if result = 0
Status Affected:
Description:
None
Status Affected:
Description:
None
The contents of register ‘f’ are decre-
mented. If ‘d’ is ‘0’, the result is placed
in the W register. If ‘d’ is ‘1’, the result
is placed back in register ‘f’.
The contents of register ‘f’ are incre-
mented. If ‘d’ is ‘0’, the result is placed
in the W register. If ‘d’ is ‘1’, the result
is placed back in register ‘f’.
If the result is ‘1’, the next instruction is
executed. If the result is ‘0’, then a
NOPis executed instead, making it a
2-cycle instruction.
If the result is ‘1’, the next instruction is
executed. If the result is ‘0’, a NOPis
executed instead, making it a 2-cycle
instruction.
GOTO
Unconditional Branch
IORLW
Inclusive OR literal with W
Syntax:
[ label ] GOTO
0 k 2047
k
Syntax:
[ label ] IORLW
0 k 255
(W) .OR. k (W)
Z
k
Operands:
Operation:
Operands:
Operation:
Status Affected:
Description:
k PC<10:0>
PCLATH<6:3> PC<14:11>
Status Affected:
Description:
None
The contents of the W register are
OR’ed with the 8-bit literal ‘k’. The
result is placed in the W register.
GOTOis an unconditional branch. The
11-bit immediate value is loaded into
PC bits <10:0>. The upper bits of PC
are loaded from PCLATH<4:3>. GOTO
is a 2-cycle instruction.
INCF
Increment f
IORWF
Inclusive OR W with f
Syntax:
[ label ] INCF f,d
Syntax:
[ label ] IORWF f,d
Operands:
0 f 127
d [0,1]
Operands:
0 f 127
d [0,1]
Operation:
(f) + 1 (destination)
Operation:
(W) .OR. (f) (destination)
Status Affected:
Description:
Z
Status Affected:
Description:
Z
The contents of register ‘f’ are incre-
mented. If ‘d’ is ‘0’, the result is placed
in the W register. If ‘d’ is ‘1’, the result
is placed back in register ‘f’.
Inclusive OR the W register with regis-
ter ‘f’. If ‘d’ is ‘0’, the result is placed in
the W register. If ‘d’ is ‘1’, the result is
placed back in register ‘f’.
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PIC16(L)F1508/9
LSLF
Logical Left Shift
MOVF
Move f
Syntax:
[ label ] LSLF f {,d}
Syntax:
[ label ] MOVF f,d
Operands:
0 f 127
d [0,1]
Operands:
0 f 127
d [0,1]
Operation:
(f<7>) C
Operation:
(f) (dest)
(f<6:0>) dest<7:1>
0 dest<0>
Status Affected:
Description:
Z
The contents of register f is moved to
a destination dependent upon the
status of d. If d = 0,
destination is W register. If d = 1, the
destination is file register f itself. d = 1
is useful to test a file register since
status flag Z is affected.
Status Affected:
Description:
C, Z
The contents of register ‘f’ are shifted
one bit to the left through the Carry flag.
A ‘0’ is shifted into the LSb. If ‘d’ is ‘0’,
the result is placed in W. If ‘d’ is ‘1’, the
result is stored back in register ‘f’.
Words:
1
1
C
register f
0
Cycles:
Example:
MOVF
FSR, 0
After Instruction
LSRF
Logical Right Shift
W
Z
=
=
value in FSR register
1
Syntax:
[ label ] LSRF f {,d}
Operands:
0 f 127
d [0,1]
Operation:
0 dest<7>
(f<7:1>) dest<6:0>,
(f<0>) C,
Status Affected:
Description:
C, Z
The contents of register ‘f’ are shifted
one bit to the right through the Carry
flag. A ‘0’ is shifted into the MSb. If ‘d’ is
‘0’, the result is placed in W. If ‘d’ is ‘1’,
the result is stored back in register ‘f’.
0
C
register f
2011-2013 Microchip Technology Inc.
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PIC16(L)F1508/9
MOVIW
Move INDFn to W
MOVLP
Move literal to PCLATH
Syntax:
[ label ] MOVIW ++FSRn
[ label ] MOVIW --FSRn
[ label ] MOVIW FSRn++
[ label ] MOVIW FSRn--
[ label ] MOVIW k[FSRn]
Syntax:
[ label ] MOVLP
0 k 127
k PCLATH
None
k
Operands:
Operation:
Status Affected:
Description:
Operands:
Operation:
n [0,1]
mm [00,01, 10, 11]
-32 k 31
The 7-bit literal ‘k’ is loaded into the
PCLATH register.
INDFn W
Effective address is determined by
MOVLW
Move literal to W
•
•
•
FSR + 1 (preincrement)
FSR - 1 (predecrement)
FSR + k (relative offset)
Syntax:
[ label ] MOVLW
0 k 255
k (W)
k
Operands:
Operation:
Status Affected:
Description:
After the Move, the FSR value will be
either:
None
•
•
•
FSR + 1 (all increments)
FSR - 1 (all decrements)
Unchanged
The 8-bit literal ‘k’ is loaded into W reg-
ister. The “don’t cares” will assemble as
‘0’s.
Status Affected:
Z
Words:
1
1
Cycles:
Example:
Mode
Syntax
mm
00
01
10
11
MOVLW
0x5A
Preincrement
Predecrement
Postincrement
Postdecrement
++FSRn
--FSRn
FSRn++
FSRn--
After Instruction
W
=
0x5A
MOVWF
Move W to f
[ label ] MOVWF
0 f 127
(W) (f)
Syntax:
f
Description:
This instruction is used to move data
between W and one of the indirect
registers (INDFn). Before/after this
move, the pointer (FSRn) is updated by
pre/post incrementing/decrementing it.
Operands:
Operation:
Status Affected:
Description:
None
Move data from W register to register
‘f’.
Note: The INDFn registers are not
physical registers. Any instruction that
accesses an INDFn register actually
accesses the register at the address
specified by the FSRn.
Words:
1
1
Cycles:
Example:
MOVWF
Before Instruction
OPTION_REG = 0xFF
OPTION_REG
FSRn is limited to the range 0000h -
FFFFh. Incrementing/decrementing it
beyond these bounds will cause it to
wrap-around.
W
= 0x4F
After Instruction
OPTION_REG = 0x4F
= 0x4F
W
MOVLB
Move literal to BSR
Syntax:
[ label ] MOVLB
0 k 31
k BSR
None
k
Operands:
Operation:
Status Affected:
Description:
The 5-bit literal ‘k’ is loaded into the
Bank Select Register (BSR).
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PIC16(L)F1508/9
NOP
No Operation
[ label ] NOP
None
MOVWI
Move W to INDFn
Syntax:
Syntax:
[ label ] MOVWI ++FSRn
[ label ] MOVWI --FSRn
[ label ] MOVWI FSRn++
[ label ] MOVWI FSRn--
[ label ] MOVWI k[FSRn]
Operands:
Operation:
No operation
Status Affected:
Description:
Words:
None
No operation.
Operands:
Operation:
n [0,1]
mm [00,01, 10, 11]
-32 k 31
1
Cycles:
1
W INDFn
Effective address is determined by
Example:
NOP
•
•
•
FSR + 1 (preincrement)
FSR - 1 (predecrement)
FSR + k (relative offset)
After the Move, the FSR value will be
either:
Load OPTION_REG Register
with W
OPTION
•
•
FSR + 1 (all increments)
FSR - 1 (all decrements)
Syntax:
[ label ] OPTION
None
Unchanged
Operands:
Operation:
Status Affected:
Description:
Status Affected:
None
(W) OPTION_REG
None
Mode
Syntax
mm
00
01
10
11
Move data from W register to
OPTION_REG register.
Preincrement
Predecrement
Postincrement
Postdecrement
++FSRn
--FSRn
FSRn++
FSRn--
RESET
Software Reset
Syntax:
[ label ] RESET
Description:
This instruction is used to move data
between W and one of the indirect
registers (INDFn). Before/after this
move, the pointer (FSRn) is updated by
pre/post incrementing/decrementing it.
Operands:
Operation:
None
Execute a device Reset. Resets the
nRI flag of the PCON register.
Status Affected:
Description:
None
Note: The INDFn registers are not
physical registers. Any instruction that
accesses an INDFn register actually
accesses the register at the address
specified by the FSRn.
This instruction provides a way to
execute a hardware Reset by soft-
ware.
FSRn is limited to the range 0000h -
FFFFh. Incrementing/decrementing it
beyond these bounds will cause it to
wrap-around.
The increment/decrement operation on
FSRn WILL NOT affect any Status bits.
2011-2013 Microchip Technology Inc.
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PIC16(L)F1508/9
RETURN
Return from Subroutine
RETFIE
Syntax:
Return from Interrupt
[ label ] RETFIE
None
Syntax:
[ label ] RETURN
None
Operands:
Operation:
Status Affected:
Description:
Operands:
Operation:
TOS PC
None
TOS PC,
1 GIE
Status Affected:
Description:
None
Return from subroutine. The stack is
POPed and the top of the stack (TOS)
is loaded into the program counter.
This is a 2-cycle instruction.
Return from Interrupt. Stack is POPed
and Top-of-Stack (TOS) is loaded in
the PC. Interrupts are enabled by
setting Global Interrupt Enable bit,
GIE (INTCON<7>). This is a 2-cycle
instruction.
Words:
1
Cycles:
Example:
2
RETFIE
After Interrupt
PC
=
TOS
GIE =
1
RETLW
Syntax:
Return with literal in W
RLF
Rotate Left f through Carry
[ label ] RETLW
0 k 255
k
Syntax:
Operands:
[ label ]
RLF f,d
Operands:
Operation:
0 f 127
d [0,1]
k (W);
TOS PC
Operation:
See description below
C
Status Affected:
Description:
None
Status Affected:
Description:
The W register is loaded with the 8-bit
literal ‘k’. The program counter is
loaded from the top of the stack (the
return address). This is a 2-cycle
instruction.
The contents of register ‘f’ are rotated
one bit to the left through the Carry
flag. If ‘d’ is ‘0’, the result is placed in
the W register. If ‘d’ is ‘1’, the result is
stored back in register ‘f’.
Words:
1
2
C
Register f
Cycles:
Example:
CALL TABLE;W contains table
;offset value
Words:
1
1
Cycles:
Example:
•
•
•
;W now has table value
TABLE
RLF
REG1,0
Before Instruction
ADDWF PC ;W = offset
RETLW k1 ;Begin table
REG1
C
=
=
1110 0110
0
RETLW k2
;
After Instruction
•
•
•
REG1
W
C
=
=
=
1110 0110
1100 1100
1
RETLW kn ; End of table
Before Instruction
W
=
0x07
After Instruction
W
=
value of k8
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PIC16(L)F1508/9
SUBLW
Subtract W from literal
RRF
Rotate Right f through Carry
Syntax:
[ label ] SUBLW
0 k 255
k
Syntax:
[ label ] RRF f,d
Operands:
Operation:
Status Affected:
Description:
Operands:
0 f 127
d [0,1]
k - (W) W)
C, DC, Z
Operation:
See description below
C
The W register is subtracted (2’s com-
plement method) from the 8-bit literal
‘k’. The result is placed in the W regis-
ter.
Status Affected:
Description:
The contents of register ‘f’ are rotated
one bit to the right through the Carry
flag. If ‘d’ is ‘0’, the result is placed in
the W register. If ‘d’ is ‘1’, the result is
placed back in register ‘f’.
C = 0
W k
C = 1
W k
C
Register f
DC = 0
DC = 1
W<3:0> k<3:0>
W<3:0> k<3:0>
SUBWF
Subtract W from f
SLEEP
Enter Sleep mode
[ label ] SLEEP
None
Syntax:
[ label ] SUBWF f,d
Syntax:
Operands:
0 f 127
d [0,1]
Operands:
Operation:
00h WDT,
0 WDT prescaler,
1 TO,
Operation:
(f) - (W) destination)
Status Affected:
Description:
C, DC, Z
0 PD
Subtract (2’s complement method) W
register from register ‘f’. If ‘d’ is ‘0’, the
result is stored in the W
register. If ‘d’ is ‘1’, the result is stored
back in register ‘f.
Status Affected:
Description:
TO, PD
The power-down Status bit, PD is
cleared. Time-out Status bit, TO is
set. Watchdog Timer and its pres-
caler are cleared.
C = 0
W f
The processor is put into Sleep mode
with the oscillator stopped.
C = 1
W f
DC = 0
DC = 1
W<3:0> f<3:0>
W<3:0> f<3:0>
SUBWFB
Subtract W from f with Borrow
Syntax:
SUBWFB f {,d}
Operands:
0 f 127
d [0,1]
Operation:
(f) – (W) – (B) dest
Status Affected:
Description:
C, DC, Z
Subtract W and the BORROW flag
(CARRY) from register ‘f’ (2’s comple-
ment method). If ‘d’ is ‘0’, the result is
stored in W. If ‘d’ is ‘1’, the result is
stored back in register ‘f’.
2011-2013 Microchip Technology Inc.
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PIC16(L)F1508/9
SWAPF
Swap Nibbles in f
XORLW
Exclusive OR literal with W
Syntax:
[ label ] SWAPF f,d
Syntax:
[ label ] XORLW
0 k 255
k
Operands:
0 f 127
d [0,1]
Operands:
Operation:
Status Affected:
Description:
(W) .XOR. k W)
Z
Operation:
(f<3:0>) (destination<7:4>),
(f<7:4>) (destination<3:0>)
The contents of the W register are
XOR’ed with the 8-bit
literal ‘k’. The result is placed in the
W register.
Status Affected:
Description:
None
The upper and lower nibbles of regis-
ter ‘f’ are exchanged. If ‘d’ is ‘0’, the
result is placed in the W register. If ‘d’
is ‘1’, the result is placed in register ‘f’.
XORWF
Exclusive OR W with f
TRIS
Load TRIS Register with W
Syntax:
[ label ] XORWF f,d
Syntax:
[ label ] TRIS f
5 f 7
Operands:
0 f 127
d [0,1]
Operands:
Operation:
Status Affected:
Description:
(W) TRIS register ‘f’
None
Operation:
(W) .XOR. (f) destination)
Status Affected:
Description:
Z
Move data from W register to TRIS
register.
When ‘f’ = 5, TRISA is loaded.
When ‘f’ = 6, TRISB is loaded.
When ‘f’ = 7, TRISC is loaded.
Exclusive OR the contents of the W
register with register ‘f’. If ‘d’ is ‘0’, the
result is stored in the W register. If ‘d’
is ‘1’, the result is stored back in regis-
ter ‘f’.
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PIC16(L)F1508/9
29.0 ELECTRICAL SPECIFICATIONS
(†)
29.1 Absolute Maximum Ratings
Ambient temperature under bias...................................................................................................... -40°C to +125°C
Storage temperature ........................................................................................................................ -65°C to +150°C
Voltage on pins with respect to VSS
on VDD pin
PIC16F1508/9 ........................................................................................................... -0.3V to +6.5V
PIC16LF1508/9 ......................................................................................................... -0.3V to +4.0V
on MCLR pin ........................................................................................................................... -0.3V to +9.0V
on all other pins ............................................................................................................ -0.3V to (VDD + 0.3V)
Maximum current
(1)
on VSS pin
-40°C TA +85°C .............................................................................................................. 170 mA
-40°C TA +125°C .............................................................................................................. 70 mA
(1)
on VDD pin
-40°C TA +85°C .............................................................................................................. 170 mA
-40°C TA +125°C .............................................................................................................. 70 mA
on any I/O pin ..................................................................................................................................... 25 mA
Clamp current, IK (VPIN < 0 or VPIN > VDD) ................................................................................................... 20 mA
† NOTICE: Stresses above those listed under “Absolute Maximum Ratings” may cause permanent damage to the
device. This is a stress rating only and functional operation of the device at those or any other conditions above those
indicated in the operation listings of this specification is not implied. Exposure above maximum rating conditions for
extended periods may affect device reliability.
Note 1: Maximum current rating requires even load distribution across I/O pins. Maximum current rating may be
limited by the device package power dissipation characterizations, see Table 29-6: “Thermal
Characteristics” to calculate device specifications.
2011-2013 Microchip Technology Inc.
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PIC16(L)F1508/9
29.2 Standard Operating Conditions
The standard operating conditions for any device are defined as:
Operating Voltage:
Operating Temperature:
VDDMIN VDD VDDMAX
TA_MIN TA TA_MAX
(1)
VDD — Operating Supply Voltage
PIC16LF1508/9
VDDMIN (Fosc 16 MHz).......................................................................................................... +1.8V
VDDMIN (Fosc 20 MHz).......................................................................................................... +2.5V
VDDMAX .................................................................................................................................... +3.6V
PIC16F1508/9
VDDMIN (Fosc 16 MHz).......................................................................................................... +2.3V
VDDMIN (Fosc 20 MHz).......................................................................................................... +2.5V
VDDMAX .................................................................................................................................... +5.5V
TA — Operating Ambient Temperature Range
Industrial Temperature
TA_MIN ...................................................................................................................................... -40°C
TA_MAX .................................................................................................................................... +85°C
Extended Temperature
TA_MIN ...................................................................................................................................... -40°C
TA_MAX .................................................................................................................................. +125°C
Note 1: See Parameter D001, DS Characteristics: Supply Voltage.
DS40001609B-page 322
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PIC16(L)F1508/9
FIGURE 29-1:
VOLTAGE FREQUENCY GRAPH, -40°C TA +125°C, PIC16F1508/9 ONLY
5.5
2.5
2.3
0
4
10
16
20
Frequency (MHz)
Note 1: The shaded region indicates the permissible combinations of voltage and frequency.
2: Refer to Table 29-7 for each Oscillator mode’s supported frequencies.
FIGURE 29-2:
VOLTAGE FREQUENCY GRAPH, -40°C TA +125°C, PIC16LF1508/9 ONLY
3.6
2.5
1.8
0
4
10
16
20
Frequency (MHz)
Note 1: The shaded region indicates the permissible combinations of voltage and frequency.
2: Refer to Table 29-7 for each Oscillator mode’s supported frequencies.
2011-2013 Microchip Technology Inc.
DS40001609B-page 323
PIC16(L)F1508/9
29.3 DC Characteristics
TABLE 29-1: SUPPLY VOLTAGE
PIC16LF1508/9
Standard Operating Conditions (unless otherwise stated)
PIC16F1508/9
Param.
No.
Sym.
Characteristic
Supply Voltage
Min.
Typ†
Max.
Units
Conditions
D001
VDD
VDDMIN
1.8
2.5
VDDMAX
3.6
3.6
—
—
V
V
FOSC 16 MHz
FOSC 20 MHz
D001
2.3
2.5
—
—
5.5
5.5
V
V
FOSC 16 MHz
FOSC 20 MHz
D002*
VDR
RAM Data Retention Voltage(1)
Power-on Reset Release Voltage(2)
Power-on Reset Rearm Voltage(2)
Fixed Voltage Reference Voltage
1.5
1.7
—
—
—
—
V
V
Device in Sleep mode
Device in Sleep mode
D002*
D002A* VPOR
—
—
1.6
1.6
—
—
V
V
D002A*
D002B* VPORR*
—
—
—
0.8
1.5
—
—
—
V
V
V
D002B*
D003
VFVR
1.024
-40°C TA +85°C
D003A VADFVR
FVR Gain Voltage Accuracy for
ADC
1x VFVR, ADFVR = 01, VDD 2.5V
2x VFVR, ADFVR = 10, VDD 2.5V
4x VFVR, ADFVR = 11, VDD 4.75V
-4
—
+4
%
D003B VCDAFVR FVR Gain Voltage Accuracy for
1x VFVR, CDAFVR = 01, VDD 2.5V
2x VFVR, CDAFVR = 10, VDD 2.5V
4x VFVR, CDAFVR = 11, VDD 4.75V
-4
—
—
+4
—
%
Comparator
D004*
SVDD
VDD Rise Rate(2)
0.05
V/ms Ensures that the Power-on Reset
signal is released properly.
*
These parameters are characterized but not tested.
†
Data in “Typ” column is at 3.0V, 25°C unless otherwise stated. These parameters are for design guidance only and are not
tested.
Note 1: This is the limit to which VDD can be lowered in Sleep mode without losing RAM data.
2: See Figure 29-3, POR and POR REARM with Slow Rising VDD.
DS40001609B-page 324
2011-2013 Microchip Technology Inc.
PIC16(L)F1508/9
FIGURE 29-3:
POR AND POR REARM WITH SLOW RISING VDD
VDD
VPOR
VPORR
SVDD
VSS
NPOR(1)
POR REARM
VSS
(3)
(2)
TPOR
TVLOW
Note 1: When NPOR is low, the device is held in Reset.
2: TPOR 1 s typical.
3: TVLOW 2.7 s typical.
2011-2013 Microchip Technology Inc.
DS40001609B-page 325
PIC16(L)F1508/9
(1,2)
TABLE 29-2: SUPPLY CURRENT (IDD)
Standard Operating Conditions (unless otherwise stated)
PIC16LF1508/9
PIC16F1508/9
Conditions
Note
Param.
No.
Device
Characteristics
Min.
Typ†
Max. Units
VDD
D010
—
—
8
20
25
A
A
1.8
3.0
FOSC = 32 kHz,
LP Oscillator,
-40°C TA +85°C
10
D010
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
15
17
31
33
A
A
A
A
A
A
A
A
A
A
A
A
A
A
A
2.3
3.0
5.0
1.8
3.0
2.3
3.0
5.0
1.8
3.0
2.3
3.0
5.0
1.8
3.0
FOSC = 32 kHz,
LP Oscillator,
-40°C TA +85°C
21
39
D011
D011
60
100
180
180
220
280
240
360
320
410
500
65
FOSC = 1 MHz,
XT Oscillator
100
100
130
170
140
250
210
280
340
30
FOSC = 1 MHz,
XT Oscillator
D012
D012
FOSC = 4 MHz,
XT Oscillator
FOSC = 4 MHz,
XT Oscillator
D013
D013
FOSC = 1 MHz,
External Clock (ECM),
Medium-Power mode
55
100
—
—
—
—
—
65
85
110
140
190
190
310
A
A
A
A
A
2.3
3.0
5.0
1.8
3.0
FOSC = 1 MHz,
External Clock (ECM),
Medium-Power mode
115
115
210
D014
D014
FOSC = 4 MHz,
External Clock (ECM),
Medium-Power mode
—
—
—
180
240
295
270
365
460
A
A
A
2.3
3.0
5.0
FOSC = 4 MHz,
External Clock (ECM),
Medium-Power mode
*
These parameters are characterized but not tested.
†
Data in “Typ” column is at 3.0V, 25°C unless otherwise stated. These parameters are for design guidance
only and are not tested.
Note 1: The test conditions for all IDD measurements in active operation mode are: OSC1 = external square wave,
from rail-to-rail; all I/O pins tri-stated, pulled to VSS; MCLR = VDD; WDT disabled.
2: The supply current is mainly a function of the operating voltage and frequency. Other factors, such as I/O
pin loading and switching rate, oscillator type, internal code execution pattern and temperature, also have
an impact on the current consumption.
3: For EXTRC oscillator configurations, current through REXT is not included. The current through the resis-
tor can be extended by the formula IR = VDD/2REXT (mA) with REXT in k.
DS40001609B-page 326
2011-2013 Microchip Technology Inc.
PIC16(L)F1508/9
(1,2)
TABLE 29-2: SUPPLY CURRENT (IDD)
(CONTINUED)
Standard Operating Conditions (unless otherwise stated)
PIC16LF1508/9
PIC16F1508/9
Conditions
Note
Param.
No.
Device
Characteristics
Min.
Typ†
Max. Units
VDD
D015
—
—
3.2
5.4
12
20
A
A
1.8
3.0
FOSC = 31 kHz,
LFINTOSC,
-40°C TA +85°C
D015
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
13
15
28
30
A
A
A
A
A
A
A
A
A
A
A
A
A
A
A
A
A
A
A
2.3
3.0
5.0
1.8
3.0
2.3
3.0
5.0
1.8
3.0
2.3
3.0
5.0
1.8
3.0
2.3
3.0
5.0
3.0
FOSC = 31 kHz,
LFINTOSC,
-40°C TA +85°C
17
36
D016
D016
215
275
270
300
350
410
630
530
660
730
600
970
780
1000
1090
1030
360
480
450
500
620
660
970
750
1100
1200
940
1400
1200
1550
1700
1500
FOSC = 500 kHz,
HFINTOSC
FOSC = 500 kHz,
HFINTOSC
D017*
D017*
FOSC = 8 MHz,
HFINTOSC
FOSC = 8 MHz,
HFINTOSC
D018
D018
FOSC = 16 MHz,
HFINTOSC
FOSC = 16 MHz,
HFINTOSC
D019A
D019A
FOSC = 20 MHz,
External Clock (ECH),
High-Power mode
—
—
1060
1220
1600
1800
A
A
3.0
5.0
FOSC = 20 MHz,
External Clock (ECH),
High-Power mode
*
These parameters are characterized but not tested.
†
Data in “Typ” column is at 3.0V, 25°C unless otherwise stated. These parameters are for design guidance
only and are not tested.
Note 1: The test conditions for all IDD measurements in active operation mode are: OSC1 = external square wave,
from rail-to-rail; all I/O pins tri-stated, pulled to VSS; MCLR = VDD; WDT disabled.
2: The supply current is mainly a function of the operating voltage and frequency. Other factors, such as I/O
pin loading and switching rate, oscillator type, internal code execution pattern and temperature, also have
an impact on the current consumption.
3: For EXTRC oscillator configurations, current through REXT is not included. The current through the resis-
tor can be extended by the formula IR = VDD/2REXT (mA) with REXT in k.
2011-2013 Microchip Technology Inc.
DS40001609B-page 327
PIC16(L)F1508/9
(1,2)
TABLE 29-2: SUPPLY CURRENT (IDD)
(CONTINUED)
Standard Operating Conditions (unless otherwise stated)
PIC16LF1508/9
PIC16F1508/9
Conditions
Note
Param.
No.
Device
Characteristics
Min.
Typ†
Max. Units
VDD
D019B
—
—
6
8
16
22
A
A
1.8
3.0
FOSC = 32 kHz,
External Clock (ECL),
Low-Power mode
D019B
—
—
—
—
—
13
15
16
19
32
28
31
36
35
55
A
A
A
A
A
2.3
3.0
5.0
1.8
3.0
FOSC = 32 kHz,
External Clock (ECL),
Low-Power mode
D019C
D019C
FOSC = 500 kHz,
External Clock (ECL),
Low-Power mode
—
—
—
—
—
—
—
—
—
31
38
52
65
A
A
A
A
A
A
A
A
A
2.3
3.0
5.0
1.8
3.0
2.3
3.0
5.0
3.0
FOSC = 500 kHz,
External Clock (ECL),
Low-Power mode
44
74
D020
D020
140
250
210
280
350
1135
210
330
290
380
470
1700
FOSC = 4 MHz,
EXTRC (Note 3)
FOSC = 4 MHz,
EXTRC (Note 3)
D021
D021
FOSC = 20 MHz,
HS Oscillator
—
—
1170
1555
1800
2300
A
A
3.0
5.0
FOSC = 20 MHz,
HS Oscillator
*
These parameters are characterized but not tested.
†
Data in “Typ” column is at 3.0V, 25°C unless otherwise stated. These parameters are for design guidance
only and are not tested.
Note 1: The test conditions for all IDD measurements in active operation mode are: OSC1 = external square wave,
from rail-to-rail; all I/O pins tri-stated, pulled to VSS; MCLR = VDD; WDT disabled.
2: The supply current is mainly a function of the operating voltage and frequency. Other factors, such as I/O
pin loading and switching rate, oscillator type, internal code execution pattern and temperature, also have
an impact on the current consumption.
3: For EXTRC oscillator configurations, current through REXT is not included. The current through the resis-
tor can be extended by the formula IR = VDD/2REXT (mA) with REXT in k.
DS40001609B-page 328
2011-2013 Microchip Technology Inc.
PIC16(L)F1508/9
(1,2)
TABLE 29-3: POWER-DOWN CURRENTS (IPD)
Operating Conditions: (unless otherwise stated)
Low-Power Sleep Mode
PIC16LF1508/9
PIC16F1508/9
Param.
Low-Power Sleep Mode, VREGPM = 1
Conditions
Note
Max.
+85°C +125°C
Max.
Device Characteristics
Min.
Typ†
Units
No.
VDD
D022
Base IPD
Base IPD
—
—
—
—
—
—
—
—
0.020
0.025
0.25
0.30
0.40
9.8
1.0
2.0
3.0
4.0
6.0
16
8.0
9.0
10
12
15
18
20
26
A
A
A
A
A
A
A
A
1.8
3.0
2.3
3.0
5.0
2.3
3.0
5.0
WDT, BOR, FVR and SOSC
disabled, all Peripherals inactive
D022
WDT, BOR, FVR and SOSC
disabled, all Peripherals inactive,
Low-Power Sleep mode
D022A
Base IPD
WDT, BOR, FVR and SOSC
disabled, all Peripherals inactive,
Normal-Power Sleep mode,
VREGPM = 0
10.3
11.5
18
21
D023
D023
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
0.26
0.44
0.43
0.53
0.64
15
2.0
3.0
6.0
7.0
8.0
28
9.0
10
15
20
22
30
33
35
37
39
20
30
40
10
14
17
A
A
A
A
A
A
A
A
A
A
A
A
A
A
A
A
1.8
3.0
2.3
3.0
5.0
1.8
3.0
2.3
3.0
5.0
3.0
3.0
5.0
3.0
3.0
5.0
WDT Current
WDT Current
D023A
D023A
FVR Current
FVR Current
18
30
18
33
19
35
20
37
D024
D024
6.0
17
BOR Current
BOR Current
7.0
17
8.0
20
D24A
D24A
0.1
4.0
5.0
8.0
LPBOR Current
LPBOR Current
0.35
0.45
*
These parameters are characterized but not tested.
†
Data in “Typ” column is at 3.0V, 25°C unless otherwise stated. These parameters are for design guidance only and are
not tested.
Note 1: The peripheral current can be determined by subtracting the base IPD current from this limit. Max. values should be
used when calculating total current consumption.
2: The power-down current in Sleep mode does not depend on the oscillator type. Power-down current is measured with
the part in Sleep mode, with all I/O pins in high-impedance state and tied to VSS.
3: ADC clock source is FRC.
2011-2013 Microchip Technology Inc.
DS40001609B-page 329
PIC16(L)F1508/9
(1,2)
TABLE 29-3: POWER-DOWN CURRENTS (IPD)
(CONTINUED)
Operating Conditions: (unless otherwise stated)
Low-Power Sleep Mode
PIC16LF1508/9
PIC16F1508/9
Param.
Low-Power Sleep Mode, VREGPM = 1
Conditions
Max.
+85°C +125°C
Max.
Device Characteristics
Min.
Typ†
Units
No.
VDD
Note
SOSC Current
D025
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
0.7
2.3
1.0
2.4
6.9
0.11
0.12
0.30
0.35
0.45
250
250
280
280
280
7
4.0
8.0
6.0
8.5
20
1.5
2.7
4.0
5.0
8.0
—
9.0
12
11
20
25
9.0
10
11
13
16
—
A
A
A
A
A
A
A
A
A
A
A
A
A
A
A
A
A
A
A
A
1.8
3.0
2.3
3.0
5.0
1.8
3.0
2.3
3.0
5.0
1.8
3.0
2.3
3.0
5.0
1.8
3.0
2.3
3.0
5.0
D025
SOSC Current
D026
D026
ADC Current (Note 3),
No conversion in progress
ADC Current (Note 3),
No conversion in progress
D026A*
D026A*
ADC Current (Note 3),
Conversion in progress
—
—
—
—
ADC Current (Note 3),
Conversion in progress
—
—
—
—
D027
D027
22
23
35
37
38
25
27
37
38
40
Comparator,
CxSP = 0
8
17
Comparator,
CxSP = 0
18
19
*
These parameters are characterized but not tested.
†
Data in “Typ” column is at 3.0V, 25°C unless otherwise stated. These parameters are for design guidance only and are
not tested.
Note 1: The peripheral current can be determined by subtracting the base IPD current from this limit. Max. values should be
used when calculating total current consumption.
2: The power-down current in Sleep mode does not depend on the oscillator type. Power-down current is measured with
the part in Sleep mode, with all I/O pins in high-impedance state and tied to VSS.
3: ADC clock source is FRC.
DS40001609B-page 330
2011-2013 Microchip Technology Inc.
PIC16(L)F1508/9
TABLE 29-4: I/O PORTS
Standard Operating Conditions (unless otherwise stated)
Param.
No.
Sym.
Characteristic
Min.
Typ†
Max.
Units
Conditions
VIL
Input Low Voltage
I/O PORT:
D030
D030A
D031
with TTL buffer
—
—
—
—
—
—
—
—
—
—
—
—
—
—
0.8
V
V
V
V
V
V
V
4.5V VDD 5.5V
0.15 VDD
0.2 VDD
0.3 VDD
0.8
1.8V VDD 4.5V
2.0V VDD 5.5V
with Schmitt Trigger buffer
with I2C™ levels
with SMbus levels
MCLR, OSC1 (EXTRC mode)
OSC1 (HS mode)
2.7V VDD 5.5V
D032
D033
0.2 VDD
0.3 VDD
(Note 1)
VIH
Input High Voltage
I/O PORT:
D040
with TTL buffer
2.0
—
—
—
—
V
V
4.5V VDD 5.5V
1.8V VDD 4.5V
D040A
0.25 VDD +
0.8
D041
with Schmitt Trigger buffer
with I2C™ levels
0.8 VDD
0.7 VDD
2.1
—
—
—
—
—
—
—
—
—
—
—
—
V
V
V
V
V
V
2.0V VDD 5.5V
2.7V VDD 5.5V
with SMbus levels
MCLR
D042
0.8 VDD
0.7 VDD
0.9 VDD
D043A
D043B
OSC1 (HS mode)
OSC1 (EXTRC mode)
Input Leakage Current(2)
I/O Ports
VDD 2.0V (Note 1)
IIL
D060
—
—
—
± 5
± 5
± 125
± 1000
± 200
nA
nA
nA
VSS VPIN VDD,
Pin at high-impedance, 85°C
VSS VPIN VDD,
Pin at high-impedance, 125°C
D061
MCLR(3)
± 50
VSS VPIN VDD,
Pin at high-impedance, 85°C
IPUR
VOL
Weak Pull-up Current
D070*
25
25
100
140
200
300
A
A
VDD = 3.3V, VPIN = VSS
VDD = 5.0V, VPIN = VSS
Output Low Voltage(4)
D080
I/O Ports
IOL = 8 mA, VDD = 5V
IOL = 6 mA, VDD = 3.3V
IOL = 1.8 mA, VDD = 1.8V
—
—
0.6
—
V
V
VOH
Output High Voltage(4)
D090
I/O Ports
IOH = 3.5 mA, VDD = 5V
IOH = 3 mA, VDD = 3.3V
IOH = 1 mA, VDD = 1.8V
VDD - 0.7
—
D101*
COSC2 Capacitive Loading Specifications on Output Pins
OSC2 pin
In XT, HS, LP modes when
external clock is used to drive
OSC1
—
—
—
—
15
50
pF
pF
D101A* CIO
All I/O pins
*
These parameters are characterized but not tested.
†
Data in “Typ” column is at 3.0V, 25°C unless otherwise stated. These parameters are for design guidance only and are
not tested.
Note 1: In EXTRC oscillator configuration, the OSC1/CLKIN pin is a Schmitt Trigger input. It is not recommended to use an
external clock in EXTRC mode.
2: Negative current is defined as current sourced by the pin.
3: The leakage current on the MCLR pin is strongly dependent on the applied voltage level. The specified levels represent
normal operating conditions. Higher leakage current may be measured at different input voltages.
4: Excluding OSC2 in CLKOUT mode.
2011-2013 Microchip Technology Inc.
DS40001609B-page 331
PIC16(L)F1508/9
TABLE 29-5: MEMORY PROGRAMMING SPECIFICATIONS
Standard Operating Conditions (unless otherwise stated)
Param.
Sym.
Characteristic
Min.
Typ†
Max.
Units
Conditions
No.
Program Memory
Programming Specifications
D110
D111
VIHH
Voltage on MCLR/VPP pin
8.0
—
—
—
9.0
10
V
(Note 2)
IDDP
Supply Current during
Programming
mA
D112
D113
VBE
VDD for Bulk Erase
2.7
—
—
VDDMAX
VDDMAX
V
V
VPEW
VDD for Write or Row Erase
VDDMIN
D114
IPPPGM Current on MCLR/VPP during
Erase/Write
—
1.0
—
mA
D115
IDDPGM Current on VDD during
Erase/Write
—
5.0
—
mA
Program Flash Memory
D121
EP
Cell Endurance
10K
—
—
E/W -40C TA +85C
(Note 1)
D122
D123
D124
VPRW
TIW
VDD for Read/Write
VDDMIN
—
—
2
VDDMAX
2.5
V
Self-timed Write Cycle Time
Characteristic Retention
ms
TRETD
—
40
—
Year Provided no other
specifications are violated
D125
EHEFC High-Endurance Flash Cell
100K
—
—
E/W 0°C to +60°C, lower byte
last 128 addresses
†
Data in “Typ” column is at 3.0V, 25°C unless otherwise stated. These parameters are for design guidance
only and are not tested.
Note 1: Self-write and Block Erase.
2: Required only if single-supply programming is disabled.
DS40001609B-page 332
2011-2013 Microchip Technology Inc.
PIC16(L)F1508/9
TABLE 29-6: THERMAL CHARACTERISTICS
Standard Operating Conditions (unless otherwise stated)
Param.
Sym.
Characteristic
Typ.
Units
Conditions
20-pin DIP package
No.
TH01
JA
Thermal Resistance Junction to Ambient
62.2
77.7
87.3
43
C/W
C/W
C/W
C/W
C/W
20-pin SOIC package
20-pin SSOP package
20-pin QFN 4X4mm package
TH02
JC
Thermal Resistance Junction to Case
27.5
20-pin DIP package
23.1
31.1
5.3
150
—
C/W
C/W
C/W
C
20-pin SOIC package
20-pin SSOP package
20-pin QFN 4X4mm package
TH03
TH04
TH05
TH06
TH07
TJMAX
PD
Maximum Junction Temperature
Power Dissipation
W
PD = PINTERNAL + PI/O
(1)
PINTERNAL Internal Power Dissipation
—
W
PINTERNAL = IDD x VDD
PI/O
I/O Power Dissipation
Derated Power
—
W
PI/O = (IOL * VOL) + (IOH * (VDD - VOH))
(2)
PDER
—
W
PDER = PDMAX (TJ - TA)/JA
Note 1: IDD is current to run the chip alone without driving any load on the output pins.
2: TA = Ambient Temperature; TJ = Junction Temperature
2011-2013 Microchip Technology Inc.
DS40001609B-page 333
PIC16(L)F1508/9
29.4 AC Characteristics
Timing Parameter Symbology has been created with one of the following formats:
1. TppS2ppS
2. TppS
T
F
Frequency
Lowercase letters (pp) and their meanings:
pp
cc
T
Time
CCP1
CLKOUT
CS
osc
rd
CLKIN
RD
ck
cs
di
rw
sc
ss
t0
RD or WR
SCKx
SS
SDIx
do
dt
SDO
Data in
I/O PORT
MCLR
T0CKI
T1CKI
WR
io
t1
mc
wr
Uppercase letters and their meanings:
S
F
H
I
Fall
P
R
V
Z
Period
High
Rise
Invalid (High-impedance)
Low
Valid
L
High-impedance
FIGURE 29-4:
LOAD CONDITIONS
Load Condition
Pin
CL
VSS
Legend: CL = 50 pF for all pins
FIGURE 29-5:
CLOCK TIMING
Q4
Q1
Q2
Q3
Q4
Q1
CLKIN
OS12
OS11
OS02
OS03
CLKOUT
(CLKOUT mode)
Note 1:
See Table 29-9.
DS40001609B-page 334
2011-2013 Microchip Technology Inc.
PIC16(L)F1508/9
TABLE 29-7: CLOCK OSCILLATOR TIMING REQUIREMENTS
Standard Operating Conditions (unless otherwise stated)
Param.
Sym.
Characteristic
Min.
Typ†
Max.
Units
Conditions
No.
OS01
FOSC
External CLKIN Frequency(1)
DC
DC
—
—
0.5
4
MHz External Clock (ECL)
MHz
MHz
kHz
External Clock (ECM)
DC
—
20
External Clock (ECH)
LP Oscillator
Oscillator Frequency(1)
—
0.1
1
32.768
—
—
4
MHz XT Oscillator
—
4
MHz HS Oscillator
1
—
20
4
MHz HS Oscillator, VDD > 2.7V
MHz EXTRC, VDD > 2.0V
DC
27
250
50
50
—
—
OS02
TOSC
External CLKIN Period(1)
Oscillator Period(1)
—
µs
ns
ns
ns
µs
ns
ns
ns
ns
µs
ns
ns
ns
ns
ns
LP Oscillator
XT Oscillator
HS Oscillator
External Clock (EC)
LP Oscillator
XT Oscillator
HS Oscillator
EXTRC
—
—
—
30.5
—
—
250
50
250
200
2
10,000
1,000
—
—
—
OS03
TCY
Instruction Cycle Time(1)
External CLKIN High
External CLKIN Low
TCY
—
DC
—
TCY = 4/FOSC
LP Oscillator
XT Oscillator
HS Oscillator
LP Oscillator
XT Oscillator
HS Oscillator
OS04*
TosH,
TosL
100
20
0
—
—
—
—
OS05*
TosR,
TosF
External CLKIN Rise
External CLKIN Fall
—
—
0
—
—
0
—
—
*
These parameters are characterized but not tested.
†
Data in “Typ” column is at 3.0V, 25°C unless otherwise stated. These parameters are for design guidance only and are not
tested.
Note 1: Instruction cycle period (TCY) equals four times the input oscillator time base period. All specified values are based on
characterization data for that particular oscillator type under standard operating conditions with the device executing code.
Exceeding these specified limits may result in an unstable oscillator operation and/or higher than expected current con-
sumption. All devices are tested to operate at “min” values with an external clock applied to CLKIN pin. When an external
clock input is used, the “max” cycle time limit is “DC” (no clock) for all devices.
2011-2013 Microchip Technology Inc.
DS40001609B-page 335
PIC16(L)F1508/9
TABLE 29-8: OSCILLATOR PARAMETERS
Standard Operating Conditions (unless otherwise stated)
Param.
No.
Freq.
Tolerance
Sym.
Characteristic
Min. Typ† Max. Units
Conditions
OS08
HFOSC
Internal Calibrated HFINTOSC
Frequency(1)
±2%
—
16.0
—
MHz VDD = 3.0V, TA = 25°C,
(Note 2)
OS09
LFOSC
Internal LFINTOSC Frequency
—
—
—
—
31
5
—
kHz (Note 3)
s
OS10* TIOSC ST HFINTOSC
Wake-up from Sleep Start-up Time
OS10A* TLFOSC ST LFINTOSC
Wake-up from Sleep Start-up Time
These parameters are characterized but not tested.
15
—
—
0.5
—
ms
-40°C TA +125°C
*
†
Data in “Typ” column is at 3.0V, 25°C unless otherwise stated. These parameters are for design guidance only and are
not tested.
Note 1: To ensure these oscillator frequency tolerances, VDD and VSS must be capacitively decoupled as close to the device as
possible. 0.1 F and 0.01 F values in parallel are recommended.
2: See Figure 29-6: “HFINTOSC Frequency Accuracy over Device VDD and Temperature”,
Figure 30-73: “HFINTOSC Accuracy Over Temperature, VDD = 1.8V, PIC16LF1508/9 Only”, and
Figure 30-74: “HFINTOSC Accuracy Over Temperature, 2.3V VDD 5.5V”.
3: See Figure 30-71: “LFINTOSC Frequency over VDD and Temperature, PIC16LF1508/9 Only”, and
Figure 30-72: “ LFINTOSC Frequency over VDD and Temperature, PIC16F1508/9”.
FIGURE 29-6:
HFINTOSC FREQUENCY ACCURACY OVER VDD AND TEMPERATURE
125
±12%
85
60
25
0
-4.5% to +7%
±4.5%
±12%
-40
1.8
2.0
2.3 2.5
3.5
4.0
VDD (V)
4.5
5.0
5.5
3.0
Note:
See Figure 30-73: “HFINTOSC Accuracy Over Temperature, VDD = 1.8V, PIC16LF1508/9 Only”,
and Figure 30-74: “HFINTOSC Accuracy Over Temperature, 2.3V VDD 5.5V”.
DS40001609B-page 336
2011-2013 Microchip Technology Inc.
PIC16(L)F1508/9
FIGURE 29-7:
CLKOUT AND I/O TIMING
Cycle
Write
Q4
Fetch
Q1
Read
Execute
Q3
Q2
FOSC
OS12
OS11
OS20
OS21
CLKOUT
OS19
OS13
OS18
OS16
OS17
I/O pin
(Input)
OS14
OS15
I/O pin
(Output)
New Value
Old Value
OS18, OS19
TABLE 29-9: CLKOUT AND I/O TIMING PARAMETERS
Standard Operating Conditions (unless otherwise stated)
Param.
No.
Sym.
Characteristic
Min.
Typ† Max. Units
Conditions
(1)
OS11
OS12
OS13
TosH2ckL
TosH2ckH
TckL2ioV
FOSC to CLKOUT
—
—
—
—
—
—
70
72
20
ns
ns
ns
3.3V VDD 5.0V
3.3V VDD 5.0V
(1)
FOSC to CLKOUT
CLKOUT to Port out valid(1)
(1)
OS14
OS15
OS16
TioV2ckH
TosH2ioV
TosH2ioI
Port input valid before CLKOUT
TOSC + 200 ns
—
50
—
—
70*
—
ns
ns
ns
Fosc (Q1 cycle) to Port out valid
—
3.3V VDD 5.0V
3.3V VDD 5.0V
Fosc (Q2 cycle) to Port input invalid
50
(I/O in setup time)
OS17
TioV2osH
TioR
Port input valid to Fosc(Q2 cycle)
(I/O in setup time)
20
—
—
ns
ns
ns
OS18*
OS19*
Port output rise time
Port output fall time
—
—
40
15
72
32
VDD = 1.8V
3.3V VDD 5.0V
TioF
—
—
28
15
55
30
VDD = 1.8V
3.3V VDD 5.0V
OS20*
OS21*
Tinp
Tioc
INT pin input high or low time
25
25
—
—
—
—
ns
ns
Interrupt-on-change new input level time
*
These parameters are characterized but not tested.
Data in “Typ” column is at 3.0V, 25C unless otherwise stated.
Note 1: Measurements are taken in EXTRC mode where CLKOUT output is 4 x TOSC.
†
2011-2013 Microchip Technology Inc.
DS40001609B-page 337
PIC16(L)F1508/9
FIGURE 29-8:
RESET, WATCHDOG TIMER, OSCILLATOR START-UP TIMER AND POWER-UP
TIMER TIMING
VDD
MCLR
30
Internal
POR
33
PWRT
Time-out
32
OSC
Start-up Time
Internal Reset(1)
Watchdog Timer
Reset(1)
31
34
34
I/O pins
Note 1: Asserted low.
FIGURE 29-9:
BROWN-OUT RESET TIMING AND CHARACTERISTICS
VDD
VBOR and VHYST
VBOR
(Device in Brown-out Reset)
(Device not in Brown-out Reset)
37
Reset
33(1)
(due to BOR)
Note 1: 64 ms delay only if PWRTE bit in the Configuration Words is programmed to ‘0’.
2 ms delay if PWRTE = 0.
DS40001609B-page 338
2011-2013 Microchip Technology Inc.
PIC16(L)F1508/9
TABLE 29-10: RESET, WATCHDOG TIMER, OSCILLATOR START-UP TIMER, POWER-UP TIMER
AND BROWN-OUT RESET PARAMETERS
Standard Operating Conditions (unless otherwise stated)
Param.
Sym.
TMCL
Characteristic
Min. Typ† Max. Units
Conditions
No.
30
MCLR Pulse Width (low)
2
—
—
s
31
TWDTLP Low-Power Watchdog Timer
Time-out Period
10
16
27
ms VDD = 3.3V-5V,
1:16 Prescaler used
(1)
32
TOST
—
1024
—
TOSC
Oscillator Start-up Timer Period
TPWRT Power-up Timer Period, PWRTE = 0
33*
34*
40
—
65
—
140
2.0
ms
TIOZ
I/O high-impedance from MCLR Low
or Watchdog Timer Reset
s
(2)
35
VBOR
Brown-out Reset Voltage
2.55 2.70 2.85
V
BORV = 0
2.35 2.45 2.58
1.80 1.90 2.05
V
V
BORV = 1 (PIC16F1508/9)
BORV = 1(PIC16LF1508/9)
36*
37*
38
VHYST
Brown-out Reset Hysteresis
0
1
25
16
60
35
mV -40°C TA +85°C
s VDD VBOR
TBORDC Brown-out Reset DC Response Time
VLPBOR Low-Power Brown-Out Reset Voltage 1.8
2.1
2.5
V
LPBOR = 1
*
These parameters are characterized but not tested.
†
Data in “Typ” column is at 3.0V, 25°C unless otherwise stated. These parameters are for design guidance
only and are not tested.
Note 1: By design, the Oscillator Start-up Timer (OST) counts the first 1024 cycles, independent of frequency.
2: To ensure these voltage tolerances, VDD and VSS must be capacitively decoupled as close to the device as
possible. 0.1 F and 0.01 F values in parallel are recommended.
2011-2013 Microchip Technology Inc.
DS40001609B-page 339
PIC16(L)F1508/9
FIGURE 29-10:
TIMER0 AND TIMER1 EXTERNAL CLOCK TIMINGS
T0CKI
40
41
42
T1CKI
45
46
49
47
TMR0 or
TMR1
TABLE 29-11: TIMER0 AND TIMER1 EXTERNAL CLOCK REQUIREMENTS
Standard Operating Conditions (unless otherwise stated)
Param.
Sym.
TT0H
Characteristic
Min.
Typ†
Max.
Units
Conditions
No.
40*
T0CKI High Pulse Width
No Prescaler
With Prescaler
No Prescaler
With Prescaler
0.5 TCY + 20
—
—
—
—
—
—
—
—
—
—
ns
ns
ns
ns
10
0.5 TCY + 20
10
41*
42*
TT0L
TT0P
T0CKI Low Pulse Width
T0CKI Period
Greater of:
20 or TCY + 40
N
ns N = prescale value
45*
46*
47*
TT1H
TT1L
TT1P
T1CKI High Synchronous, No Prescaler
0.5 TCY + 20
—
—
—
—
—
—
—
—
—
—
—
—
—
—
ns
Time
Synchronous, with Prescaler
Asynchronous
15
ns
30
ns
T1CKI Low Synchronous, No Prescaler
0.5 TCY + 20
ns
Time
Synchronous, with Prescaler
Asynchronous
15
30
ns
ns
T1CKI Input Synchronous
Period
Greater of:
30 or TCY + 40
N
ns N = prescale value
Asynchronous
60
—
—
ns
48
FT1
Secondary Oscillator Input Frequency Range
(Oscillator enabled by setting bit T1OSCEN)
32.4
32.768 33.1
kHz
49*
TCKEZTMR1 Delay from External Clock Edge to Timer
Increment
2 TOSC
—
7 TOSC
—
Timers in Sync
mode
*
These parameters are characterized but not tested.
†
Data in “Typ” column is at 3.0V, 25°C unless otherwise stated. These parameters are for design guidance only and are not
tested.
DS40001609B-page 340
2011-2013 Microchip Technology Inc.
PIC16(L)F1508/9
FIGURE 29-11:
CLC PROPAGATION TIMING
Rev. 10-000031A_A3
LCx_in[n](1)
CLC
Input time
CLC
Module
CLC
CLCx
CLCxINn
CLCxINn
LCx_out(1)
Output time
CLC
CLC
Module
CLC
CLCx
LCx_in[n](1)
Input time
LCx_out(1)
Output time
CLC01
CLC02
CLC03
Note 1: See Figure 24-1, CLC Simplified Block Diagram.
TABLE 29-12: CONFIGURATION LOGIC CELL (CLC) CHARACTERISTICS
Standard Operating Conditions (unless otherwise stated)
Param.
No.
Sym.
Characteristic
Min. Typ† Max. Units
Conditions
CLC01* TCLCIN
CLC02* TCLC
CLC input time
CLC module input to output progagation time
—
7
—
ns
—
—
24
12
—
—
ns VDD = 1.8V
ns VDD > 3.6V
CLC03* TCLCOUT CLC output time
Rise Time
Fall Time
—
—
—
OS18
OS19
45
—
—
—
—
—
(Note 1)
(Note 1)
CLC04* FCLCMAX CLC maximum switching frequency
MHz
*
These parameters are characterized but not tested.
†
Data in “Typ” column is at 3.0V, 25°C unless otherwise stated. These parameters are for design guidance
only and are not tested.
Note 1: See Table 29-9 for OS18 and OS19 rise and fall times.
2011-2013 Microchip Technology Inc.
DS40001609B-page 341
PIC16(L)F1508/9
(1,2,3,4)
TABLE 29-13: ANALOG-TO-DIGITAL CONVERTER (ADC) CHARACTERISTICS
Operating Conditions (unless otherwise stated)
VDD = 3.0V, TA = 25°C
Param.
No.
Sym.
Characteristic
Resolution
Min.
Typ†
Max. Units
Conditions
AD01
AD02
AD03
NR
—
—
—
—
±1
±1
10
±1.7
±1
bit
EIL
EDL
Integral Error
LSb VREF = 3.0V
Differential Error
LSb No missing codes
VREF = 3.0V
AD04
AD05
AD06
AD07
AD08
EOFF Offset Error
—
—
±1
±1
—
—
—
±2.5
±2.0
VDD
VREF
10
LSb VREF = 3.0V
LSb VREF = 3.0V
EGN Gain Error
VREF Reference Voltage
VAIN Full-Scale Range
1.8
VSS
—
V
V
VREF = (VREF+ minus VREF-)
ZAIN Recommended Impedance of
Analog Voltage Source
k Can go higher if external 0.01F capacitor is
present on input pin.
*
These parameters are characterized but not tested.
†
Data in “Typ” column is at 3.0V, 25°C unless otherwise stated. These parameters are for design guidance only and are not
tested.
Note 1: Total Absolute Error includes integral, differential, offset and gain errors.
2: The ADC conversion result never decreases with an increase in the input voltage and has no missing codes.
3: ADC VREF is from external VREF or the VDD pin, whichever is selected as reference input.
4: See Section 30.0 “DC and AC Characteristics Graphs and Charts” for operating characterization.
DS40001609B-page 342
2011-2013 Microchip Technology Inc.
PIC16(L)F1508/9
FIGURE 29-12:
ADC CONVERSION TIMING (ADC CLOCK FOSC-BASED)
BSF ADCON0, GO
AD133
Q4
1 TCY
AD131
AD130
ADC_clk
9
8
7
6
3
2
1
0
ADC Data
NEW_DATA
1 TCY
OLD_DATA
ADRES
ADIF
GO
DONE
Sampling Stopped
AD132
Sample
FIGURE 29-13:
ADC CONVERSION TIMING (ADC CLOCK FROM FRC)
BSF ADCON0, GO
AD133
Q4
1 TCY
AD131
AD130
ADC_clk
9
8
7
3
2
1
0
6
ADC Data
NEW_DATA
1 TCY
OLD_DATA
ADRES
ADIF
GO
DONE
Sampling Stopped
AD132
Sample
Note 1: If the ADC clock source is selected as FRC, a time of TCY is added before the ADC clock starts. This allows the
SLEEPinstruction to be executed.
2011-2013 Microchip Technology Inc.
DS40001609B-page 343
PIC16(L)F1508/9
TABLE 29-14: ADC CONVERSION REQUIREMENTS
Standard Operating Conditions (unless otherwise stated)
Param.
Sym.
Characteristic
Min.
Typ†
Max. Units
Conditions
No.
AD130* TAD
ADC Clock Period (TADC)
ADC Internal FRC Oscillator Period (TFRC)
AD131 TCNV Conversion Time
(not including Acquisition Time)(1)
1.0
1.0
—
—
2.0
11
6.0
6.0
—
s FOSC-based
s ADCS<2:0> = x11(ADC FRC mode)
TAD Set GO/DONE bit to conversion
complete
AD132* TACQ Acquisition Time
—
5.0
—
s
AD133* THCD Holding Capacitor Disconnect Time
—
—
1/2 TAD
1/2 TAD + 1TCY
—
—
FOSC-based
ADCS<2:0> = x11 (ADC FRC mode)
*
These parameters are characterized but not tested.
†
Data in “Typ” column is at 3.0V, 25°C unless otherwise stated. These parameters are for design guidance only and are not
tested.
Note 1: The ADRES register may be read on the following TCY cycle.
DS40001609B-page 344
2011-2013 Microchip Technology Inc.
PIC16(L)F1508/9
(1)
TABLE 29-15: COMPARATOR SPECIFICATIONS
Operating Conditions (unless otherwise stated)
VDD = 3.0V, TA = 25°C
Param.
No.
Sym.
Characteristics
Input Offset Voltage
Min.
Typ.
Max.
Units
Comments
CM01
VIOFF
—
±7.5
±60
mV CxSP = 1,
VICM = VDD/2
CM02
VICM
Input Common Mode Voltage
Common Mode Rejection Ration
Response Time Rising Edge
Response Time Falling Edge
Response Time Rising Edge
Response Time Falling Edge
0
—
50
VDD
—
V
CM03
CMRR
—
—
—
—
—
—
dB
CM04A
CM04B
CM04C
CM04D
CM05*
400
200
1200
550
—
800
400
—
ns
ns
ns
ns
s
CxSP = 1
CxSP = 1
CxSP = 0
CxSP = 0
(2)
TRESP
—
TMC2OV Comparator Mode Change to
Output Valid
10
CM06
CHYSTER Comparator Hysteresis
—
25
—
mV CxHYS = 1,
CxSP = 1
*
These parameters are characterized but not tested.
Note 1: See Section 30.0 “DC and AC Characteristics Graphs and Charts” for operating characterization.
2: Response time measured with one comparator input at VDD/2, while the other input transitions from VSS to
VDD.
(1)
TABLE 29-16: DIGITAL-TO-ANALOG CONVERTER (DAC) SPECIFICATIONS
Operating Conditions (unless otherwise stated)
VDD = 3.0V, TA = 25°C
Param.
No.
Sym.
Characteristics
Step Size
Min.
Typ.
Max.
Units
Comments
DAC01*
DAC02*
DAC03*
DAC04*
*
CLSB
—
—
—
—
VDD/32
—
—
1/2
—
V
LSb
CACC
CR
Absolute Accuracy
Unit Resistor Value (R)
5K
(2)
CST
Settling Time
—
10
s
These parameters are characterized but not tested.
Note 1: See Section 30.0 “DC and AC Characteristics Graphs and Charts” for operating characterization.
2: Settling time measured while DACR<4:0> transitions from ‘0000’ to ‘1111’.
2011-2013 Microchip Technology Inc.
DS40001609B-page 345
PIC16(L)F1508/9
FIGURE 29-14:
USART SYNCHRONOUS TRANSMISSION (MASTER/SLAVE) TIMING
CK
DT
US121
US121
US122
US120
Refer to Figure 29-4 for load conditions.
Note:
TABLE 29-17: USART SYNCHRONOUS TRANSMISSION REQUIREMENTS
Standard Operating Conditions (unless otherwise stated)
Param.
No.
Symbol
Characteristic
Min.
Max.
Units
Conditions
US120 TCKH2DTV SYNC XMIT (Master and Slave)
Clock high to data-out valid
—
—
—
—
—
—
80
100
45
ns
ns
ns
ns
ns
ns
3.0V VDD 5.5V
1.8V VDD 5.5V
3.0V VDD 5.5V
1.8V VDD 5.5V
3.0V VDD 5.5V
1.8V VDD 5.5V
US121 TCKRF
Clock out rise time and fall time
(Master mode)
50
US122 TDTRF
Data-out rise time and fall time
45
50
FIGURE 29-15:
USART SYNCHRONOUS RECEIVE (MASTER/SLAVE) TIMING
CK
DT
US125
US126
Note: Refer to Figure 29-4 for load conditions.
TABLE 29-18: USART SYNCHRONOUS RECEIVE REQUIREMENTS
Standard Operating Conditions (unless otherwise stated)
Param.
No.
Symbol
Characteristic
Min.
Max. Units
Conditions
US125 TDTV2CKL SYNC RCV (Master and Slave)
Data-hold before CK (DT hold time)
10
15
—
—
ns
ns
US126 TCKL2DTL Data-hold after CK (DT hold time)
DS40001609B-page 346
2011-2013 Microchip Technology Inc.
PIC16(L)F1508/9
FIGURE 29-16:
SPI MASTER MODE TIMING (CKE = 0, SMP = 0)
SS
SP81
SCK
(CKP = 0)
SP71
SP72
SP78
SP79
SP79
SCK
(CKP = 1)
SP78
LSb
SP80
MSb
bit 6 - - - - - -1
SDO
SDI
SP75, SP76
bit 6 - - - -1
MSb In
LSb In
SP74
SP73
Note: Refer to Figure 29-4 for load conditions.
FIGURE 29-17:
SPI MASTER MODE TIMING (CKE = 1, SMP = 1)
SS
SP81
SCK
(CKP = 0)
SP71
SP73
SP72
SP79
SCK
(CKP = 1)
SP80
SP78
LSb
MSb
bit 6 - - - - - -1
SDO
SDI
SP75, SP76
bit 6 - - - -1
MSb In
SP74
Note: Refer to Figure 29-4 for load conditions.
LSb In
2011-2013 Microchip Technology Inc.
DS40001609B-page 347
PIC16(L)F1508/9
FIGURE 29-18:
SPI SLAVE MODE TIMING (CKE = 0)
SS
SP70
SCK
(CKP = 0)
SP83
SP71
SP72
SP78
SP79
SP79
SCK
(CKP = 1)
SP78
LSb
SP80
MSb
SDO
SDI
bit 6 - - - - - -1
SP75, SP76
bit 6 - - - -1
SP77
MSb In
SP74
SP73
LSb In
Note: Refer to Figure 29-4 for load conditions.
FIGURE 29-19:
SPI SLAVE MODE TIMING (CKE = 1)
SP82
SP70
SS
SP83
SCK
(CKP = 0)
SP72
SP71
SCK
(CKP = 1)
SP80
MSb
bit 6 - - - - - -1
LSb
SDO
SDI
SP77
SP75, SP76
bit 6 - - - -1
MSb In
SP74
LSb In
Note: Refer to Figure 29-4 for load conditions.
DS40001609B-page 348
2011-2013 Microchip Technology Inc.
PIC16(L)F1508/9
TABLE 29-19: SPI MODE REQUIREMENTS
Standard Operating Conditions (unless otherwise stated)
Param.
No.
Symbol
Characteristic
Min.
Typ† Max. Units
Conditions
SP70* TSSL2SCH, SS to SCK or SCK input
2.25 TCY
—
—
ns
TSSL2SCL
SP71* TSCH
SP72* TSCL
SCK input high time (Slave mode)
SCK input low time (Slave mode)
1 TCY + 20
1 TCY + 20
100
—
—
—
—
—
—
ns
ns
ns
SP73* TDIV2SCH, Setup time of SDI data input to SCK
TDIV2SCL
edge
SP74* TSCH2DIL,
TSCL2DIL
Hold time of SDI data input to SCK
edge
100
—
—
ns
SP75* TDOR
SDO data output rise time
—
—
10
25
10
—
10
25
10
—
—
—
25
50
25
50
25
50
25
50
145
—
ns 3.0V VDD 5.5V
ns 1.8V VDD 5.5V
SP76* TDOF
SDO data output fall time
—
ns
SP77* TSSH2DOZ SS to SDO output high-impedance
10
ns
SP78* TSCR
SCK output rise time
(Master mode)
—
ns 3.0V VDD 5.5V
ns 1.8V VDD 5.5V
ns
—
SP79* TSCF
SCK output fall time (Master mode)
—
SP80* TSCH2DOV, SDO data output valid after SCK
TSCL2DOV edge
—
ns 3.0V VDD 5.5V
ns 1.8V VDD 5.5V
ns
—
SP81* TDOV2SCH, SDO data output setup to SCK edge
TDOV2SCL
1 Tcy
SP82* TSSL2DOV
SDO data output valid after SS
edge
—
—
—
50
—
ns
ns
SP83* TSCH2SSH, SS after SCK edge
1.5 TCY + 40
TSCL2SSH
*
These parameters are characterized but not tested.
†
Data in “Typ” column is at 3.0V, 25°C unless otherwise stated. These parameters are for design guidance
only and are not tested.
2011-2013 Microchip Technology Inc.
DS40001609B-page 349
PIC16(L)F1508/9
2
FIGURE 29-20:
I C™ BUS START/STOP BITS TIMING
SCL
SP93
SP91
SP90
SP92
SDA
Stop
Condition
Start
Condition
Note: Refer to Figure 29-4 for load conditions.
2
TABLE 29-20: I C™ BUS START/STOP BITS REQUIREMENTS
Standard Operating Conditions (unless otherwise stated)
Param.
No.
Symbol
Characteristic
Min. Typ Max. Units
Conditions
SP90* TSU:STA Start condition
Setup time
100 kHz mode
400 kHz mode
100 kHz mode
400 kHz mode
100 kHz mode
400 kHz mode
100 kHz mode
400 kHz mode
4700
600
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
ns Only relevant for Repeated
Start condition
SP91* THD:STA Start condition
Hold time
4000
600
ns After this period, the first
clock pulse is generated
SP92* TSU:STO Stop condition
Setup time
4700
600
ns
SP93 THD:STO Stop condition
Hold time
4000
600
ns
*
These parameters are characterized but not tested.
2
FIGURE 29-21:
I C™ BUS DATA TIMING
SP100
SP103
SP102
SP101
SCL
SP90
SP106
SP107
SP92
SP91
SDA
In
SP110
SP109
SP109
SDA
Out
Note: Refer to Figure 29-4 for load conditions.
DS40001609B-page 350
2011-2013 Microchip Technology Inc.
PIC16(L)F1508/9
2
TABLE 29-21: I C™ BUS DATA REQUIREMENTS
Standard Operating Conditions (unless otherwise stated)
Param.
No.
Symbol
Characteristic
Min.
Max. Units
Conditions
SP100* THIGH
Clock high time
Clock low time
100 kHz mode
4.0
—
—
s
s
Device must operate at a
minimum of 1.5 MHz
400 kHz mode
0.6
Device must operate at a
minimum of 10 MHz
SSP module
1.5TCY
4.7
—
—
SP101* TLOW
100 kHz mode
s
s
Device must operate at a
minimum of 1.5 MHz
400 kHz mode
SSP module
1.3
—
Device must operate at a
minimum of 10 MHz
1.5TCY
—
—
SP102* TR
SP103* TF
SDA and SCL rise 100 kHz mode
time
1000
ns
ns
400 kHz mode
20 + 0.1CB 300
CB is specified to be from
10-400 pF
SDA and SCL fall
time
100 kHz mode
400 kHz mode
—
250
ns
ns
20 + 0.1CB 250
CB is specified to be from
10-400 pF
SP106* THD:DAT Data input hold time 100 kHz mode
400 kHz mode
0
—
0.9
—
ns
s
ns
ns
ns
ns
s
s
0
SP107* TSU:DAT Data input setup
time
100 kHz mode
400 kHz mode
100 kHz mode
400 kHz mode
100 kHz mode
400 kHz mode
250
100
—
(Note 2)
(Note 1)
—
SP109* TAA
Output valid from
clock
3500
—
—
SP110* TBUF
Bus free time
4.7
1.3
—
Time the bus must be free
before a new transmission
can start
—
SP111 CB
Bus capacitive loading
—
400
pF
*
These parameters are characterized but not tested.
Note 1: As a transmitter, the device must provide this internal minimum delay time to bridge the undefined region
(min. 300 ns) of the falling edge of SCL to avoid unintended generation of Start or Stop conditions.
2
2
2: A Fast mode (400 kHz) I C™ bus device can be used in a Standard mode (100 kHz) I C bus system, but
the requirement TSU:DAT 250 ns must then be met. This will automatically be the case if the device does
not stretch the low period of the SCL signal. If such a device does stretch the low period of the SCL signal,
it must output the next data bit to the SDA line TR max. + TSU:DAT = 1000 + 250 = 1250 ns (according to
2
the Standard mode I C bus specification), before the SCL line is released.
2011-2013 Microchip Technology Inc.
DS40001609B-page 351
PIC16(L)F1508/9
DS40001609B-page 352
2011-2013 Microchip Technology Inc.
PIC16(L)F1508/9
30.0 DC AND AC CHARACTERISTICS GRAPHS AND CHARTS
The graphs and tables provided in this section are for design guidance and are not tested.
In some graphs or tables, the data presented are outside specified operating range (i.e., outside specified VDD
range). This is for information only and devices are ensured to operate properly only within the specified range.
Note:
The graphs and tables provided following this note are a statistical summary based on a limited number of
samples and are provided for informational purposes only. The performance characteristics listed herein
are not tested or guaranteed. In some graphs or tables, the data presented may be outside the specified
operating range (e.g., outside specified power supply range) and therefore, outside the warranted range.
“Typical” represents the mean of the distribution at 25C. “MAXIMUM”, “Max.”, “MINIMUM” or “Min.”
represents (mean + 3) or (mean - 3) respectively, where is a standard deviation, over each
temperature range.
2011-2013 Microchip Technology Inc.
Preliminary
DS40001609B-page 351
PIC16(L)F1508/9
FIGURE 30-1:
IDD, LP OSCILLATOR, FOSC = 32 kHz, PIC16LF1508/9 ONLY
18
16
14
12
10
8
Max: 85°C + 3ı
Typical: 25°C
Max.
Typical
6
4
2
0
1.6
1.8
2.0
2.2
2.4
2.6
2.8
3.0
3.2
3.4
3.6
3.8
VDD (V)
FIGURE 30-2:
IDD, LP OSCILLATOR, FOSC = 32 kHz, PIC16F1508/9 ONLY
30
Max.
Max: 85°C + 3ı
Typical: 25°C
25
20
15
10
5
Typical
0
2.0
2.5
3.0
3.5
4.0
4.5
5.0
5.5
6.0
VDD (V)
DS40001609B-page 352
Preliminary
2011-2013 Microchip Technology Inc.
PIC16(L)F1508/9
FIGURE 30-3:
IDD TYPICAL, XT AND EXTRC OSCILLATOR, PIC16LF1508/9 ONLY
350
Typical: 25°C
300
250
200
150
100
50
4 MHz EXTRC
4 MHz XT
1 MHz XT
1 MHz EXTRC
0
1.6
1.8
2.0
2.2
2.4
2.6
2.8
3.0
3.2
3.4
3.6
3.8
VDD (V)
FIGURE 30-4:
IDD MAXIMUM, XT AND EXTRC OSCILLATOR, PIC16LF1508/9 ONLY
400
350
300
250
200
150
100
50
Max: 85°C + 3ı
4 MHz XT
4 MHz EXTRC
1 MHz XT
1 MHz EXTRC
2.8
0
1.6
1.8
2.0
2.2
2.4
2.6
3.0
3.2
3.4
3.6
3.8
VDD (V)
2011-2013 Microchip Technology Inc.
Preliminary
DS40001609B-page 353
PIC16(L)F1508/9
FIGURE 30-5:
IDD TYPICAL, XT AND EXTRC OSCILLATOR, PIC16F1508/9 ONLY
400
350
300
250
200
150
100
50
4 MHz EXTRC
4 MHz XT
Typical: 25°C
1 MHz XT
1 MHz EXTRC
0
2.0
2.5
3.0
3.5
4.0
4.5
5.0
5.5
6.0
VDD (V)
FIGURE 30-6:
IDD MAXIMUM, XT AND EXTRC OSCILLATOR, PIC16F1508/9 ONLY
500
450
400
350
300
250
200
150
100
50
4 MHz XT
Max: 85°C + 3ı
4 MHz EXTRC
1 MHz XT
1 MHz EXTRC
0
2.0
2.5
3.0
3.5
4.0
4.5
5.0
5.5
6.0
VDD (V)
DS40001609B-page 354
Preliminary
2011-2013 Microchip Technology Inc.
PIC16(L)F1508/9
FIGURE 30-7:
IDD, EXTERNAL CLOCK (ECL), LOW-POWER MODE, FOSC = 32 kHz,
PIC16LF1508/9 ONLY
14
12
10
8
Max.
Typical
6
4
Max: 85°C + 3ı
Typical: 25°C
2
0
1.6
1.8
2.0
2.2
2.4
2.6
2.8
3.0
3.2
3.4
3.6
3.8
VDD (V)
FIGURE 30-8:
IDD, EXTERNAL CLOCK (ECL), LOW-POWER MODE, FOSC = 32 kHz,
PIC16F1508/9 ONLY
25
Max.
20
15
10
5
Typical
Max: 85°C + 3ı
Typical: 25°C
0
2.0
2.5
3.0
3.5
4.0
4.5
5.0
5.5
6.0
VDD (V)
2011-2013 Microchip Technology Inc.
Preliminary
DS40001609B-page 355
PIC16(L)F1508/9
FIGURE 30-9:
IDD, EXTERNAL CLOCK (ECL), LOW-POWER MODE, FOSC = 500 kHz,
PIC16LF1508/9 ONLY
50
45
40
35
30
25
20
15
10
5
Max: 85°C + 3ı
Typical: 25°C
Max.
Typical
0
1.6
1.8
2.0
2.2
2.4
2.6
2.8
3.0
3.2
3.4
3.6
3.8
VDD (V)
FIGURE 30-10:
IDD, EXTERNAL CLOCK (ECL), LOW-POWER MODE, FOSC = 500 kHz,
PIC16F1508/9 ONLY
60
50
40
30
20
10
Max.
Typical
Max: 85°C + 3ı
Typical: 25°C
0
2.0
2.5
3.0
3.5
4.0
4.5
5.0
5.5
6.0
VDD (V)
DS40001609B-page 356
Preliminary
2011-2013 Microchip Technology Inc.
PIC16(L)F1508/9
FIGURE 30-11:
IDD TYPICAL, EXTERNAL CLOCK (ECM), MEDIUM-POWER MODE,
PIC16LF1508/9 ONLY
300
250
200
150
100
50
Typical: 25°C
4 MHz
1 MHz
0
1.6
1.8
2.0
2.2
2.4
2.6
2.8
3.0
3.2
3.4
3.6
3.8
VDD (V)
FIGURE 30-12:
IDD MAXIMUM, EXTERNAL CLOCK (ECM), MEDIUM-POWER MODE,
PIC16LF1508/9 ONLY
350
300
250
200
150
100
50
Max: 85°C + 3ı
4 MHz
1 MHz
0
1.6
1.8
2.0
2.2
2.4
2.6
2.8
3.0
3.2
3.4
3.6
3.8
VDD (V)
2011-2013 Microchip Technology Inc.
Preliminary
DS40001609B-page 357
PIC16(L)F1508/9
FIGURE 30-13:
IDD TYPICAL, EXTERNAL CLOCK (ECM), MEDIUM-POWER MODE,
PIC16F1508/9 ONLY
350
300
250
200
150
100
50
4 MHz
Typical: 25°C
1 MHz
0
2.0
2.5
3.0
3.5
4.0
4.5
5.0
5.5
6.0
VDD (V)
FIGURE 30-14:
IDD MAXIMUM, EXTERNAL CLOCK (ECM), MEDIUM-POWER MODE,
PIC16F1508/9 ONLY
400
350
300
250
200
150
100
50
4 MHz
Max: 85°C + 3ı
1 MHz
0
2.0
2.5
3.0
3.5
4.0
4.5
5.0
5.5
6.0
VDD (V)
DS40001609B-page 358
Preliminary
2011-2013 Microchip Technology Inc.
PIC16(L)F1508/9
FIGURE 30-15:
IDD TYPICAL, EXTERNAL CLOCK (ECH), HIGH-POWER MODE,
PIC16LF1508/9 ONLY
1.4
1.2
1.0
0.8
0.6
0.4
0.2
20 MHz
16 MHz
Typical: 25°C
8 MHz
0.0
1.6
1.8
2.0
2.2
2.4
2.6
2.8
DD (V)
3.0
3.2
3.4
3.6
3.8
V
FIGURE 30-16:
IDD MAXIMUM, EXTERNAL CLOCK (ECH), HIGH-POWER MODE,
PIC16LF1508/9 ONLY
1.6
1.4
1.2
1.0
0.8
0.6
0.4
0.2
20 MHz
Max: 85°C + 3ı
16 MHz
8 MHz
0.0
1.6
1.8
2.0
2.2
2.4
2.6
2.8
DD (V)
3.0
3.2
3.4
3.6
3.8
V
2011-2013 Microchip Technology Inc.
Preliminary
DS40001609B-page 359
PIC16(L)F1508/9
FIGURE 30-17:
IDD TYPICAL, EXTERNAL CLOCK (ECH), HIGH-POWER MODE,
PIC16F1508/9 ONLY
1.4
1.2
1.0
0.8
0.6
0.4
0.2
20 MHz
16 MHz
Typical: 25°C
8 MHz
0.0
2.0
2.5
3.0
3.5
4.0
4.5
5.0
5.5
6.0
VDD (V)
FIGURE 30-18:
IDD MAXIMUM, EXTERNAL CLOCK (ECH), HIGH-POWER MODE,
PIC16F1508/9 ONLY
1.6
20 MHz
16 MHz
Max: 85°C + 3ı
1.4
1.2
1.0
0.8
0.6
0.4
0.2
0.0
8 MHz
2.0
2.5
3.0
3.5
4.0
4.5
5.0
5.5
6.0
VDD (V)
DS40001609B-page 360
Preliminary
2011-2013 Microchip Technology Inc.
PIC16(L)F1508/9
FIGURE 30-19:
IDD, LFINTOSC, FOSC = 31 kHz, PIC16LF1508/9 ONLY
12
Max.
Max: 85°C + 3ı
Typical: 25°C
10
8
6
Typical
4
2
0
1.6
1.8
2.0
2.2
2.4
2.6
2.8
3.0
3.2
3.4
3.6
3.8
VDD (V)
FIGURE 30-20:
IDD, LFINTOSC, FOSC = 31 kHz, PIC16F1508/9 ONLY
25
Max.
20
15
10
5
Typical
Max: 85°C + 3ı
Typical: 25°C
0
2.0
2.5
3.0
3.5
4.0
4.5
5.0
5.5
6.0
VDD (V)
2011-2013 Microchip Technology Inc.
Preliminary
DS40001609B-page 361
PIC16(L)F1508/9
FIGURE 30-21:
IDD, MFINTOSC, FOSC = 500 kHz, PIC16LF1508/9 ONLY
400
350
300
250
200
150
100
50
Max: 85°C + 3ı
Typical: 25°C
Max.
Typical
0
1.6
1.8
2.0
2.2
2.4
2.6
2.8
3.0
3.2
3.4
3.6
3.8
VDD (V)
FIGURE 30-22:
IDD, MFINTOSC, FOSC = 500 kHz, PIC16F1508/9 ONLY
450
Max: 85°C + 3ı
Typical: 25°C
Max.
400
350
300
250
200
150
100
50
Typical
0
2.0
2.5
3.0
3.5
4.0
4.5
5.0
5.5
6.0
VDD (V)
DS40001609B-page 362
Preliminary
2011-2013 Microchip Technology Inc.
PIC16(L)F1508/9
FIGURE 30-23:
IDD TYPICAL, HFINTOSC, PIC16LF1508/9 ONLY
1.4
1.2
1.0
0.8
0.6
0.4
0.2
Typical: 25°C
16 MHz
8 MHz
4 MHz
0.0
1.6
1.8
2.0
2.2
2.4
2.6
2.8
3.0
3.2
3.4
3.6
3.8
VDD (V)
FIGURE 30-24:
IDD MAXIMUM, HFINTOSC, PIC16LF1508/9 ONLY
1.6
1.4
1.2
1.0
0.8
0.6
0.4
0.2
Max: 85°C + 3ı
16 MHz
8 MHz
4 MHz
0.0
1.6
1.8
2.0
2.2
2.4
2.6
2.8
3.0
3.2
3.4
3.6
3.8
VDD (V)
2011-2013 Microchip Technology Inc.
Preliminary
DS40001609B-page 363
PIC16(L)F1508/9
FIGURE 30-25:
IDD TYPICAL, HFINTOSC, PIC16F1508/9 ONLY
1.2
16 MHz
1.0
0.8
0.6
0.4
0.2
8 MHz
4 MHz
Typical: 25°C
2.5
0.0
2.0
3.0
3.5
4.0
4.5
5.0
5.5
6.0
VDD (V)
FIGURE 30-26:
IDD MAXIMUM, HFINTOSC, PIC16F1508/9 ONLY
1.4
1.2
1.0
0.8
0.6
0.4
0.2
16 MHz
8 MHz
4 MHz
Max: 85°C + 3ı
0.0
2.0
2.5
3.0
3.5
4.0
4.5
5.0
5.5
6.0
VDD (V)
DS40001609B-page 364
Preliminary
2011-2013 Microchip Technology Inc.
PIC16(L)F1508/9
FIGURE 30-27:
IDD TYPICAL, HS OSCILLATOR, PIC16LF1508/9 ONLY
1.6
1.4
1.2
1.0
0.8
0.6
0.4
0.2
Typical: 25°C
20 MHz
8 MHz
4 MHz
0.0
1.6
1.8
2.0
2.2
2.4
2.6
2.8
DD (V)
3.0
3.2
3.4
3.6
3.8
V
FIGURE 30-28:
IDD MAXIMUM, HS OSCILLATOR, PIC16LF1508/9 ONLY
1.8
1.6
1.4
1.2
1.0
0.8
0.6
0.4
0.2
Max: 85°C + 3ı
20 MHz
8 MHz
4 MHz
0.0
1.6
1.8
2.0
2.2
2.4
2.6
2.8
DD (V)
3.0
3.2
3.4
3.6
3.8
V
2011-2013 Microchip Technology Inc.
Preliminary
DS40001609B-page 365
PIC16(L)F1508/9
FIGURE 30-29:
IDD TYPICAL, HS OSCILLATOR, PIC16F1508/9 ONLY
1.8
1.6
1.4
1.2
1.0
0.8
0.6
0.4
0.2
20 MHz
Typical: 25°C
8 MHz
4 MHz
0.0
2.0
2.5
3.0
3.5
4.0
4.5
5.0
5.5
6.0
VDD (V)
FIGURE 30-30:
IDD MAXIMUM, HS OSCILLATOR, PIC16F1508/9 ONLY
2.5
Max: 85°C + 3ı
20 MHz
2.0
1.5
1.0
0.5
8 MHz
4 MHz
0.0
2.0
2.5
3.0
3.5
4.0
4.5
5.0
5.5
6.0
VDD (V)
DS40001609B-page 366
Preliminary
2011-2013 Microchip Technology Inc.
PIC16(L)F1508/9
FIGURE 30-31:
IPD BASE, LOW-POWER SLEEP MODE, PIC16LF1508/9 ONLY
450
400
350
300
250
200
150
100
50
Max: 85°C + 3ı
Typical: 25°C
Max.
Typical
0
1.6
1.8
2.0
2.2
2.4
2.6
2.8
3.0
3.2
3.4
3.6
3.8
VDD (V)
FIGURE 30-32:
IPD BASE, LOW-POWER SLEEP MODE, VREGPM = 1, PIC16F1508/9 ONLY
600
Max.
Max: 85°C + 3ı
Typical: 25°C
500
400
300
200
100
Typical
0
2.0
2.5
3.0
3.5
4.0
4.5
5.0
5.5
6.0
VDD (V)
2011-2013 Microchip Technology Inc.
Preliminary
DS40001609B-page 367
PIC16(L)F1508/9
FIGURE 30-33:
IPD, WATCHDOG TIMER (WDT), PIC16LF1508/9 ONLY
2.0
1.8
1.6
1.4
1.2
1.0
0.8
0.6
0.4
0.2
Max: 85°C + 3ı
Typical: 25°C
Max.
Typical
2.8
0.0
1.6
1.8
2.0
2.2
2.4
2.6
3.0
3.2
3.4
3.6
3.8
VDD (V)
FIGURE 30-34:
IPD, WATCHDOG TIMER (WDT), PIC16F1508/9 ONLY
1.4
Max.
1.2
1.0
0.8
0.6
0.4
0.2
Typical
Max: 85°C + 3ı
Typical: 25°C
0.0
2.0
2.5
3.0
3.5
4.0
4.5
5.0
5.5
6.0
VDD (V)
DS40001609B-page 368
Preliminary
2011-2013 Microchip Technology Inc.
PIC16(L)F1508/9
FIGURE 30-35:
IPD, FIXED VOLTAGE REFERENCE (FVR), PIC16LF1508/9 ONLY
45
40
35
30
25
20
15
10
5
Max: 85°C + 3ı
Typical: 25°C
Max.
Typical
0
1.6
1.8
2.0
2.2
2.4
2.6
2.8
3.0
3.2
3.4
3.6
3.8
VDD (V)
FIGURE 30-36:
IPD, FIXED VOLTAGE REFERENCE (FVR), PIC16F1508/9 ONLY
30
Max.
25
20
15
10
5
Typical
Max: 85°C + 3ı
Typical: 25°C
0
2.0
2.5
3.0
3.5
4.0
4.5
5.0
5.5
6.0
VDD (V)
2011-2013 Microchip Technology Inc.
Preliminary
DS40001609B-page 369
PIC16(L)F1508/9
FIGURE 30-37:
IPD, BROWN-OUT RESET (BOR), BORV = 0, PIC16LF1508/9 ONLY
10
9
Max.
Max: 85°C + 3ı
Typical: 25°C
8
7
6
5
4
3
2
1
0
Typical
1.6
1.8
2.0
2.2
2.4
2.6
2.8
3.0
3.2
3.4
3.6
3.8
VDD (V)
FIGURE 30-38:
IPD, BROWN-OUT RESET (BOR), BORV = 1, PIC16LF1508/9 ONLY
12
Max.
Max: 85°C + 3ı
Typical: 25°C
10
8
Typical
6
4
2
0
1.6
1.8
2.0
2.2
2.4
2.6
2.8
3.0
3.2
3.4
3.6
3.8
VDD (V)
DS40001609B-page 370
Preliminary
2011-2013 Microchip Technology Inc.
PIC16(L)F1508/9
FIGURE 30-39:
IPD, BROWN-OUT RESET (BOR), BORV = 0, PIC16F1508/9 ONLY
12
Max.
Max: 85°C + 3ı
Typical: 25°C
10
8
Typical
6
4
2
0
2.0
2.5
3.0
3.5
4.0
4.5
5.0
5.5
6.0
VDD (V)
FIGURE 30-40:
IPD, BROWN-OUT RESET (BOR), BORV = 1, PIC16F1508/9 ONLY
14
Max.
Max: 85°C + 3ı
Typical: 25°C
12
10
8
Typical
6
4
2
0
2.0
2.5
3.0
3.5
4.0
4.5
5.0
5.5
6.0
VDD (V)
2011-2013 Microchip Technology Inc.
Preliminary
DS40001609B-page 371
PIC16(L)F1508/9
FIGURE 30-41:
IPD, SECONDARY OSCILLATOR, FOSC = 32 kHz, PIC16LF1508/9 ONLY
8.0
7.0
6.0
5.0
4.0
3.0
2.0
1.0
Max: 85°C + 3ı
Typical: 25°C
Max.
Typical
2.8
0.0
1.6
1.8
2.0
2.2
2.4
2.6
VDD (V)
3.0
3.2
3.4
3.6
3.8
FIGURE 30-42:
IPD, SECONDARY OSCILLATOR, FOSC = 32 kHz, PIC16F1508/9 ONLY
16
14
12
10
8
Max: 85°C + 3ı
Typical: 25°C
Max.
Typical
6
4
2
0
2.0
2.5
3.0
3.5
4.0
4.5
5.0
5.5
6.0
VDD (V)
DS40001609B-page 372
Preliminary
2011-2013 Microchip Technology Inc.
PIC16(L)F1508/9
FIGURE 30-43:
IPD, COMPARATOR, LOW-POWER MODE (CxSP = 0), PIC16LF1508/9 ONLY
14
12
10
8
Max.
Typical
6
4
Max: 85°C + 3ı
Typical: 25°C
2
0
1.6
1.8
2.0
2.2
2.4
2.6
2.8
3.0
3.2
3.4
3.6
3.8
VDD (V)
FIGURE 30-44:
IPD, COMPARATOR, LOW-POWER MODE (CxSP = 0), PIC16F1508/9 ONLY
30
25
20
15
10
5
Max.
Typical
Max: 85°C + 3ı
Typical: 25°C
0
2.0
2.5
3.0
3.5
4.0
4.5
5.0
5.5
6.0
VDD (V)
2011-2013 Microchip Technology Inc.
Preliminary
DS40001609B-page 373
PIC16(L)F1508/9
FIGURE 30-45:
IPD, COMPARATOR, NORMAL-POWER MODE (CxSP = 1), PIC16LF1508/9 ONLY
40
35
30
25
20
15
10
5
Max.
Typical
Max: 85°C + 3ı
Typical: 25°C
0
1.6
1.8
2.0
2.2
2.4
2.6
2.8
3.0
3.2
3.4
3.6
3.8
VDD (V)
FIGURE 30-46:
IPD, COMPARATOR, NORMAL-POWER MODE (CxSP = 1), PIC16F1508/9 ONLY
60
50
40
30
20
Max.
Typical
Max: 85°C + 3ı
Typical: 25°C
10
0
2.0
2.5
3.0
3.5
4.0
4.5
5.0
5.5
6.0
VDD (V)
DS40001609B-page 374
Preliminary
2011-2013 Microchip Technology Inc.
PIC16(L)F1508/9
FIGURE 30-47:
VOH vs. IOH OVER TEMPERATURE, VDD = 5.5V, PIC16F1508/9 ONLY
6
Max: 125°C + 3ı
Typical: 25°C
5
4
3
2
1
0
Min: -40°C - 3ı
Min. (-40°C)
Typical (25°C)
Max. (125°C)
-45
-40
-35
-30
-25
-20
-15
-10
-5
0
I
OH (mA)
FIGURE 30-48:
VOL vs. IOL OVER TEMPERATURE, VDD = 5.5V, PIC16F1508/9 ONLY
5
Max: 125°C + 3ı
Typical: 25°C
Min: -40°C - 3ı
Max. (125°C)
4
3
2
1
0
Typical (25°C)
Min. (-40°C)
0
10
20
30
40
50
OL (mA)
60
70
80
90
100
I
2011-2013 Microchip Technology Inc.
Preliminary
DS40001609B-page 375
PIC16(L)F1508/9
FIGURE 30-49:
VOH vs. IOH OVER TEMPERATURE, VDD = 3.0V
3.5
Max: 125°C + 3ı
Typical: 25°C
3.0
2.5
2.0
1.5
1.0
0.5
Min: -40°C - 3ı
Min. (-40°C)
Typical (25°C)
-9
Max. (125°C)
-5
0.0
-15
-13
-11
-7
-3
-1
I
OH (mA)
FIGURE 30-50:
VOL vs. IOL OVER TEMPERATURE, VDD = 3.0V
3.0
Max: 125°C + 3ı
2.5
2.0
1.5
1.0
0.5
Typical: 25°C
Min: -40°C - 3ı
Min. (-40°C)
Typical (25°C)
Max. (125°C)
0.0
0
5
10
15
20
25
30
35
40
I
OL (mA)
DS40001609B-page 376
Preliminary
2011-2013 Microchip Technology Inc.
PIC16(L)F1508/9
FIGURE 30-51:
VOH vs. IOH OVER TEMPERATURE, VDD = 1.8V, PIC16LF1508/9 ONLY
2.0
1.8
1.6
1.4
1.2
1.0
0.8
0.6
0.4
0.2
0.0
Max: 125°C + 3ı
Typical: 25°C
Min: -40°C - 3ı
Max. (125°C)
Min. (-40°C)
Typical (25°C)
-4.5
-4.0
-3.5
-3.0
-2.5
-2.0
-1.5
-1.0
-0.5
0.0
I
OH (mA)
FIGURE 30-52:
VOL vs. IOL OVER TEMPERATURE, VDD = 1.8V, PIC16LF1508/9 ONLY
1.8
Max: 125°C + 3ı
Typical: 25°C
Min: -40°C - 3ı
1.6
1.4
1.2
1.0
0.8
0.6
0.4
0.2
0.0
Max. (125°C)
Min. (-40°C)
Typical (25°C)
0
1
2
3
4
5
6
7
8
9
10
I
OL (mA)
2011-2013 Microchip Technology Inc.
Preliminary
DS40001609B-page 377
PIC16(L)F1508/9
FIGURE 30-53:
POR RELEASE VOLTAGE
1.70
1.68
1.66
1.64
1.62
1.60
1.58
1.56
1.54
1.52
Max.
Typical
Min.
Max: Typical + 3ı
Typical: 25°C
Min: Typical - 3ı
1.50
-60
-40
-20
0
20
40
60
80
100
120
140
Temperature (°C)
FIGURE 30-54:
POR REARM VOLTAGE, PIC16F1508/9 ONLY
1.54
1.52
1.50
1.48
1.46
1.44
1.42
1.40
1.38
1.36
Max: Typical + 3ı
Typical: 25°C
Min: Typical - 3ı
Max.
Typical
Min.
1.34
-60
-40
-20
0
20
40
60
80
100
120
140
Temperature (°C)
DS40001609B-page 378
Preliminary
2011-2013 Microchip Technology Inc.
PIC16(L)F1508/9
FIGURE 30-55:
BROWN-OUT RESET VOLTAGE, BORV = 1, PIC16LF1508/9 ONLY
2.00
Max.
1.95
1.90
1.85
Typical
Min.
Max: Typical + 3ı
Min: Typical - 3ı
1.80
-60
-40
-20
0
20
40
60
80
100
120
140
Temperature (°C)
FIGURE 30-56:
BROWN-OUT RESET HYSTERESIS, BORV = 1, PIC16LF1508/9 ONLY
60
50
Max.
Max: Typical + 3ı
Typical: 25°C
Min: Typical - 3ı
40
30
20
10
0
Typical
Min.
-60
-40
-20
0
20
40
60
80
100
120
140
Temperature (°C)
2011-2013 Microchip Technology Inc.
Preliminary
DS40001609B-page 379
PIC16(L)F1508/9
FIGURE 30-57:
BROWN-OUT RESET VOLTAGE, BORV = 1, PIC16F1508/9 ONLY
2.60
Max.
2.55
2.50
2.45
2.40
2.35
Typical
Min.
Max: Typical + 3ı
Min: Typical - 3ı
2.30
-60
-40
-20
0
20
40
60
80
100
120
140
Temperature (°C)
FIGURE 30-58:
BROWN-OUT RESET HYSTERESIS, BORV = 1, PIC16F1508/9 ONLY
70
Max.
60
50
40
30
20
10
Max: Typical + 3ı
Typical: 25°C
Min: Typical - 3ı
Typical
Min.
0
-60
-40
-20
0
20
40
60
80
100
120
140
Temperature (°C)
DS40001609B-page 380
Preliminary
2011-2013 Microchip Technology Inc.
PIC16(L)F1508/9
FIGURE 30-59:
BROWN-OUT RESET VOLTAGE, BORV = 0
2.80
2.75
2.70
2.65
2.60
Max.
Typical
Min.
Max: Typical + 3ı
Min: Typical - 3ı
2.55
-60
-40
-20
0
20
40
60
80
100
120
140
Temperature (°C)
FIGURE 30-60:
BROWN-OUT RESET HYSTERESIS, BORV = 0
90
80
70
60
50
40
30
20
10
Min.
Typical
Max: Typical + 3ı
Typical: 25°C
Min: Typical - 3ı
Max.
0
-60
-40
-20
0
20
40
60
80
100
120
140
Temperature (°C)
2011-2013 Microchip Technology Inc.
Preliminary
DS40001609B-page 381
PIC16(L)F1508/9
FIGURE 30-61:
LOW-POWER BROWN-OUT RESET VOLTAGE, LPBOR = 0
2.50
Max.
Max: Typical + 3ı
Min: Typical - 3ı
2.40
2.30
2.20
2.10
2.00
1.90
Typical
Min.
1.80
-60
-40
-20
0
20
40
60
80
100
120
140
Temperature (°C)
FIGURE 30-62:
LOW-POWER BROWN-OUT RESET HYSTERESIS, LPBOR = 0
45
40
35
30
25
20
15
10
5
Max: Typical + 3ı
Max.
Typical: 25°C
Min: Typical - 3ı
Typical
Min.
0
-60
-40
-20
0
20
40
60
80
100
120
140
Temperature (°C)
DS40001609B-page 382
Preliminary
2011-2013 Microchip Technology Inc.
PIC16(L)F1508/9
FIGURE 30-63:
WDT TIME-OUT PERIOD
24
22
20
18
16
14
12
Max.
Typical
Min.
Max: Typical + 3ı (-40°C to +125°C)
Typical: statistical mean @ 25°C
Min: Typical - 3ı (-40°C to +125°C)
10
1.5
2.0
2.5
3.0
3.5
VDD (V)
4.0
4.5
5.0
5.5
6.0
FIGURE 30-64:
PWRT PERIOD
100
Max: Typical + 3ı (-40°C to +125°C)
Typical: statistical mean @ 25°C
Min: Typical - 3ı (-40°C to +125°C)
90
80
70
60
50
Max.
Typical
Min.
40
1.5
2.0
2.5
3.0
3.5
VDD (V)
4.0
4.5
5.0
5.5
6.0
2011-2013 Microchip Technology Inc.
Preliminary
DS40001609B-page 383
PIC16(L)F1508/9
FIGURE 30-65:
FVR STABILIZATION PERIOD
60
Max: Typical + 3ı
50
40
30
20
10
Typical: statistical mean @ 25°C
Max.
Typical
Note:
The FVR Stabilization Period applies when:
1) coming out of RESET or exiting Sleep mode for PIC12/16LFxxxx devices.
2) when exiting sleep mode with VREGPM = 1 for PIC12/16Fxxxx devices
In all other cases, the FVR is stable when released from RESET.
0
1.6
1.8
2.0
2.2
2.4
2.6
2.8
3.0
3.2
3.4
3.6
3.8
VDD (V)
DS40001609B-page 384
Preliminary
2011-2013 Microchip Technology Inc.
PIC16(L)F1508/9
FIGURE 30-66:
COMPARATOR HYSTERESIS, NORMAL-POWER MODE (CxSP = 1, CxHYS = 1)
40
35
30
25
20
15
10
5
Max.
Typical
Min.
Max: Typical + 3ı
Typical: 25°C
Min: Typical - 3ı
0
1.5
2.0
2.5
3.0
3.5
4.0
VDD (V)
4.5
5.0
5.5
6.0
FIGURE 30-67:
COMPARATOR HYSTERESIS, LOW-POWER MODE (CxSP = 0, CxHYS = 1)
8
7
6
5
4
3
2
1
Max.
Typical
Max: Typical + 3ı
Typical: 25°C
Min: Typical - 3ı
Min.
0
1.5
2.0
2.5
3.0
3.5
4.0
VDD (V)
4.5
5.0
5.5
6.0
2011-2013 Microchip Technology Inc.
Preliminary
DS40001609B-page 385
PIC16(L)F1508/9
FIGURE 30-68:
COMPARATOR RESPONSE TIME, NORMAL-POWER MODE (CxSP = 1)
350
300
250
200
150
100
50
Max.
Typical
Max: Typical + 3ı
Typical: 25°C
0
1.5
2.0
2.5
3.0
3.5
4.0
4.5
5.0
5.5
6.0
VDD (V)
FIGURE 30-69:
COMPARATOR RESPONSE TIME OVER TEMPERATURE,
NORMAL-POWER MODE (CxSP = 1)
400
350
300
250
200
150
100
50
Max: 125°C + 3ı
Typical: 25°C
Min: -45°C - 3ı
Max. (125°C)
Typical (25°C)
Min. (-40°C)
0
1.5
2.0
2.5
3.0
3.5
4.0
DD (V)
4.5
5.0
5.5
6.0
V
DS40001609B-page 386
Preliminary
2011-2013 Microchip Technology Inc.
PIC16(L)F1508/9
FIGURE 30-70:
COMPARATOR INPUT OFFSET AT 25°C, NORMAL-POWER MODE (CxSP = 1),
PIC16F1508/9 ONLY
50
40
30
20
10
0
Max.
Typical
Min.
-10
-20
-30
-40
Max: Typical + 3ı
Typical: 25°C
Min: Typical - 3ı
-50
0.0
1.0
2.0
3.0
4.0
5.0
Common Mode Voltage (V)
2011-2013 Microchip Technology Inc.
Preliminary
DS40001609B-page 387
PIC16(L)F1508/9
FIGURE 30-71:
LFINTOSC FREQUENCY OVER VDD AND TEMPERATURE, PIC16LF1508/9 ONLY
36
34
32
30
28
26
24
22
Max.
Typical
Min.
Max: Typical + 3ı (-40°C to +125°C)
Typical: statistical mean @ 25°C
Min: Typical - 3ı (-40°C to +125°C)
20
1.6
1.8
2.0
2.2
2.4
2.6
2.8
3.0
3.2
3.4
3.6
3.8
VDD (V)
FIGURE 30-72:
LFINTOSC FREQUENCY OVER VDD AND TEMPERATURE, PIC16F1508/9 ONLY
36
34
32
30
28
26
24
22
Max.
Typical
Min.
Max: Typical + 3ı (-40°C to +125°C)
Typical: statistical mean @ 25°C
Min: Typical - 3ı (-40°C to +125°C)
20
2.0
2.5
3.0
3.5
VDD (V)
4.0
4.5
5.0
5.5
6.0
DS40001609B-page 388
Preliminary
2011-2013 Microchip Technology Inc.
PIC16(L)F1508/9
FIGURE 30-73:
HFINTOSC ACCURACY OVER TEMPERATURE, VDD = 1.8V,
PIC16LF1508/9 ONLY
8%
6%
Max: Typical + 3ı
Max.
Typical
Min.
Typical: statistical mean
Min: Typical - 3ı
4%
2%
0%
-2%
-4%
-6%
-8%
-10%
-60
-40
-20
0
20
40
60
80
100
120
140
Temperature (°C)
FIGURE 30-74:
HFINTOSC ACCURACY OVER TEMPERATURE, 2.3V VDD 5.5V
8%
6%
Max: Typical + 3ı
Typical: statistical mean
Max.
Min: Typical - 3ı
4%
2%
Typical
Min.
0%
-2%
-4%
-6%
-8%
-10%
-60
-40
-20
0
20
40
60
80
100
120
140
Temperature (°C)
2011-2013 Microchip Technology Inc.
Preliminary
DS40001609B-page 389
PIC16(L)F1508/9
FIGURE 30-75:
SLEEP MODE, WAKE PERIOD WITH HFINTOSC SOURCE, PIC16LF1508/9 ONLY
5.0
4.5
4.0
3.5
3.0
2.5
2.0
1.5
1.0
0.5
Max.
Typical
Max: 85°C + 3ı
Typical: 25°C
0.0
1.6
1.8
2.0
2.2
2.4
2.6
2.8
3.0
3.2
3.4
3.6
3.8
VDD (V)
DS40001609B-page 390
Preliminary
2011-2013 Microchip Technology Inc.
PIC16(L)F1508/9
FIGURE 30-76:
LOW-POWER SLEEP MODE, WAKE PERIOD WITH HFINTOSC SOURCE,
VREGPM = 1, PIC16F1508/9 ONLY
35
30
25
20
15
10
5
Max.
Typical
Max: 85°C + 3ı
Typical: 25°C
0
2.0
2.5
3.0
3.5
VDD (V)
4.0
4.5
5.0
5.5
6.0
FIGURE 30-77:
SLEEP MODE, WAKE PERIOD WITH HFINTOSC SOURCE, VREGPM = 0,
PIC16F1508/9 ONLY
12
10
8
Max.
Typical
6
4
Max: 85°C + 3ı
Typical: 25°C
2
0
2.0
2.5
3.0
3.5
VDD (V)
4.0
4.5
5.0
5.5
6.0
2011-2013 Microchip Technology Inc.
Preliminary
DS40001609B-page 391
PIC16(L)F1508/9
NOTES:
DS40001609B-page 392
Preliminary
2011-2013 Microchip Technology Inc.
PIC16(L)F1508/9
31.1 MPLAB X Integrated Development
Environment Software
31.0 DEVELOPMENT SUPPORT
The PIC® microcontrollers (MCU) and dsPIC® digital
signal controllers (DSC) are supported with a full range
of software and hardware development tools:
The MPLAB X IDE is a single, unified graphical user
interface for Microchip and third-party software, and
®
hardware development tool that runs on Windows ,
• Integrated Development Environment
- MPLAB® X IDE Software
• Compilers/Assemblers/Linkers
- MPLAB XC Compiler
- MPASMTM Assembler
- MPLINKTM Object Linker/
MPLIBTM Object Librarian
®
Linux and Mac OS X. Based on the NetBeans IDE,
MPLAB X IDE is an entirely new IDE with a host of free
software components and plug-ins for high-
performance application development and debugging.
Moving between tools and upgrading from software
simulators to hardware debugging and programming
tools is simple with the seamless user interface.
- MPLAB Assembler/Linker/Librarian for
Various Device Families
With complete project management, visual call graphs,
a configurable watch window and a feature-rich editor
that includes code completion and context menus,
MPLAB X IDE is flexible and friendly enough for new
users. With the ability to support multiple tools on
multiple projects with simultaneous debugging, MPLAB
X IDE is also suitable for the needs of experienced
users.
• Simulators
- MPLAB X SIM Software Simulator
• Emulators
- MPLAB REAL ICE™ In-Circuit Emulator
• In-Circuit Debuggers/Programmers
- MPLAB ICD 3
Feature-Rich Editor:
- PICkit™ 3
• Color syntax highlighting
• Device Programmers
- MPLAB PM3 Device Programmer
• Smart code completion makes suggestions and
provides hints as you type
• Low-Cost Demonstration/Development Boards,
Evaluation Kits and Starter Kits
• Automatic code formatting based on user-defined
rules
• Third-party development tools
• Live parsing
User-Friendly, Customizable Interface:
• Fully customizable interface: toolbars, toolbar
buttons, windows, window placement, etc.
• Call graph window
Project-Based Workspaces:
• Multiple projects
• Multiple tools
• Multiple configurations
• Simultaneous debugging sessions
File History and Bug Tracking:
• Local file history feature
• Built-in support for Bugzilla issue tracker
2011-2013 Microchip Technology Inc.
DS40001609B-page 393
PIC16(L)F1508/9
31.2 MPLAB XC Compilers
31.4 MPLINK Object Linker/
MPLIB Object Librarian
The MPLAB XC Compilers are complete ANSI C
compilers for all of Microchip’s 8, 16, and 32-bit MCU
and DSC devices. These compilers provide powerful
integration capabilities, superior code optimization and
ease of use. MPLAB XC Compilers run on Windows,
Linux or MAC OS X.
The MPLINK Object Linker combines relocatable
objects created by the MPASM Assembler. It can link
relocatable objects from precompiled libraries, using
directives from a linker script.
The MPLIB Object Librarian manages the creation and
modification of library files of precompiled code. When
a routine from a library is called from a source file, only
the modules that contain that routine will be linked in
with the application. This allows large libraries to be
used efficiently in many different applications.
For easy source level debugging, the compilers provide
debug information that is optimized to the MPLAB X
IDE.
The free MPLAB XC Compiler editions support all
devices and commands, with no time or memory
restrictions, and offer sufficient code optimization for
most applications.
The object linker/library features include:
• Efficient linking of single libraries instead of many
smaller files
MPLAB XC Compilers include an assembler, linker and
utilities. The assembler generates relocatable object
files that can then be archived or linked with other relo-
catable object files and archives to create an execut-
able file. MPLAB XC Compiler uses the assembler to
produce its object file. Notable features of the assem-
bler include:
• Enhanced code maintainability by grouping
related modules together
• Flexible creation of libraries with easy module
listing, replacement, deletion and extraction
31.5 MPLAB Assembler, Linker and
Librarian for Various Device
Families
• Support for the entire device instruction set
• Support for fixed-point and floating-point data
• Command-line interface
MPLAB Assembler produces relocatable machine
code from symbolic assembly language for PIC24,
PIC32 and dsPIC DSC devices. MPLAB XC Compiler
uses the assembler to produce its object file. The
assembler generates relocatable object files that can
then be archived or linked with other relocatable object
files and archives to create an executable file. Notable
features of the assembler include:
• Rich directive set
• Flexible macro language
• MPLAB X IDE compatibility
31.3 MPASM Assembler
The MPASM Assembler is a full-featured, universal
macro assembler for PIC10/12/16/18 MCUs.
• Support for the entire device instruction set
• Support for fixed-point and floating-point data
• Command-line interface
The MPASM Assembler generates relocatable object
files for the MPLINK Object Linker, Intel® standard HEX
files, MAP files to detail memory usage and symbol
reference, absolute LST files that contain source lines
and generated machine code, and COFF files for
debugging.
• Rich directive set
• Flexible macro language
• MPLAB X IDE compatibility
The MPASM Assembler features include:
• Integration into MPLAB X IDE projects
• User-defined macros to streamline
assembly code
• Conditional assembly for multipurpose
source files
• Directives that allow complete control over the
assembly process
DS40001609B-page 394
2011-2013 Microchip Technology Inc.
PIC16(L)F1508/9
31.6 MPLAB X SIM Software Simulator
31.8 MPLAB ICD 3 In-Circuit Debugger
System
The MPLAB X SIM Software Simulator allows code
development in a PC-hosted environment by simulat-
ing the PIC MCUs and dsPIC DSCs on an instruction
level. On any given instruction, the data areas can be
examined or modified and stimuli can be applied from
a comprehensive stimulus controller. Registers can be
logged to files for further run-time analysis. The trace
buffer and logic analyzer display extend the power of
the simulator to record and track program execution,
actions on I/O, most peripherals and internal registers.
The MPLAB ICD 3 In-Circuit Debugger System is
Microchip’s most cost-effective, high-speed hardware
debugger/programmer for Microchip Flash DSC and
MCU devices. It debugs and programs PIC Flash
microcontrollers and dsPIC DSCs with the powerful,
yet easy-to-use graphical user interface of the MPLAB
IDE.
The MPLAB ICD 3 In-Circuit Debugger probe is
connected to the design engineer’s PC using a high-
speed USB 2.0 interface and is connected to the target
with a connector compatible with the MPLAB ICD 2 or
MPLAB REAL ICE systems (RJ-11). MPLAB ICD 3
supports all MPLAB ICD 2 headers.
The MPLAB X SIM Software Simulator fully supports
symbolic debugging using the MPLAB XC Compilers,
and the MPASM and MPLAB Assemblers. The soft-
ware simulator offers the flexibility to develop and
debug code outside of the hardware laboratory envi-
ronment, making it an excellent, economical software
development tool.
31.9 PICkit 3 In-Circuit Debugger/
Programmer
The MPLAB PICkit 3 allows debugging and program-
ming of PIC and dsPIC Flash microcontrollers at a most
affordable price point using the powerful graphical user
interface of the MPLAB IDE. The MPLAB PICkit 3 is
connected to the design engineer’s PC using a full-
speed USB interface and can be connected to the tar-
get via a Microchip debug (RJ-11) connector (compati-
ble with MPLAB ICD 3 and MPLAB REAL ICE). The
connector uses two device I/O pins and the Reset line
to implement in-circuit debugging and In-Circuit Serial
Programming™ (ICSP™).
31.7 MPLAB REAL ICE In-Circuit
Emulator System
The MPLAB REAL ICE In-Circuit Emulator System is
Microchip’s next generation high-speed emulator for
Microchip Flash DSC and MCU devices. It debugs and
programs all 8, 16 and 32-bit MCU, and DSC devices
with the easy-to-use, powerful graphical user interface of
the MPLAB X IDE.
The emulator is connected to the design engineer’s
PC using a high-speed USB 2.0 interface and is
connected to the target with either a connector
compatible with in-circuit debugger systems (RJ-11)
or with the new high-speed, noise tolerant, Low-
Voltage Differential Signal (LVDS) interconnection
(CAT5).
31.10 MPLAB PM3 Device Programmer
The MPLAB PM3 Device Programmer is a universal,
CE compliant device programmer with programmable
voltage verification at VDDMIN and VDDMAX for
maximum reliability. It features a large LCD display
(128 x 64) for menus and error messages, and a mod-
ular, detachable socket assembly to support various
package types. The ICSP cable assembly is included
as a standard item. In Stand-Alone mode, the MPLAB
PM3 Device Programmer can read, verify and program
PIC devices without a PC connection. It can also set
code protection in this mode. The MPLAB PM3
connects to the host PC via an RS-232 or USB cable.
The MPLAB PM3 has high-speed communications and
optimized algorithms for quick programming of large
memory devices, and incorporates an MMC card for file
storage and data applications.
The emulator is field upgradable through future firmware
downloads in MPLAB X IDE. MPLAB REAL ICE offers
significant advantages over competitive emulators
including full-speed emulation, run-time variable
watches, trace analysis, complex breakpoints, logic
probes, a ruggedized probe interface and long (up to
three meters) interconnection cables.
2011-2013 Microchip Technology Inc.
DS40001609B-page 395
PIC16(L)F1508/9
31.11 Demonstration/Development
Boards, Evaluation Kits, and
Starter Kits
31.12 Third-Party Development Tools
Microchip also offers a great collection of tools from
third-party vendors. These tools are carefully selected
to offer good value and unique functionality.
A wide variety of demonstration, development and
evaluation boards for various PIC MCUs and dsPIC
DSCs allows quick application development on fully
functional systems. Most boards include prototyping
areas for adding custom circuitry and provide applica-
tion firmware and source code for examination and
modification.
• Device Programmers and Gang Programmers
from companies, such as SoftLog and CCS
• Software Tools from companies, such as Gimpel
and Trace Systems
• Protocol Analyzers from companies, such as
Saleae and Total Phase
The boards support a variety of features, including LEDs,
temperature sensors, switches, speakers, RS-232
interfaces, LCD displays, potentiometers and additional
EEPROM memory.
• Demonstration Boards from companies, such as
MikroElektronika, Digilent and Olimex
®
• Embedded Ethernet Solutions from companies,
®
such as EZ Web Lynx, WIZnet and IPLogika
The demonstration and development boards can be
used in teaching environments, for prototyping custom
circuits and for learning about various microcontroller
applications.
In addition to the PICDEM™ and dsPICDEM™
demonstration/development board series of circuits,
Microchip has a line of evaluation kits and demonstra-
®
tion software for analog filter design, KEELOQ security
ICs, CAN, IrDA®, PowerSmart battery management,
SEEVAL® evaluation system, Sigma-Delta ADC, flow
rate sensing, plus many more.
Also available are starter kits that contain everything
needed to experience the specified device. This usually
includes a single application and debug capability, all
on one board.
Check the Microchip web page (www.microchip.com)
for the complete list of demonstration, development
and evaluation kits.
DS40001609B-page 396
2011-2013 Microchip Technology Inc.
PIC16(L)F1508/9
32.0 PACKAGING INFORMATION
32.1 Package Marking Information
20-Lead PDIP (300 mil)
Example
PIC16F1508
XXXXXXXXXXXXXXXXX
XXXXXXXXXXXXXXXXX
e
3
-E/P
YYWWNNN
1120123
20-Lead SOIC (7.50 mm)
Example
PIC16F1508
e
3
-E/SO
1120123
Legend: XX...X Customer-specific information
Y
YY
Year code (last digit of calendar year)
Year code (last 2 digits of calendar year)
WW
NNN
Week code (week of January 1 is week ‘01’)
Alphanumeric traceability code
e
3
Pb-free JEDEC designator for Matte Tin (Sn)
*
This package is Pb-free. The Pb-free JEDEC designator (
can be found on the outer packaging for this package.
)
e3
Note: In the event the full Microchip part number cannot be marked on one line, it will
be carried over to the next line, thus limiting the number of available
characters for customer-specific information.
®
*
Standard PICmicro device marking consists of Microchip part number, year code, week code and
traceability code. For PICmicro device marking beyond this, certain price adders apply. Please check
with your Microchip Sales Office. For QTP devices, any special marking adders are included in QTP
price.
2011-2013 Microchip Technology Inc.
DS40001609B-page 397
PIC16(L)F1508/9
32.2 Package Marking Information
20-Lead SSOP (5.30 mm)
Example
PIC16F1508
e
3
-E/SS
1120123
20-Lead QFN (4x4x0.9 mm)
Example
PIC16
F1508
PIN 1
PIN 1
e
3
E/ML
120123
DS40001609B-page 398
2011-2013 Microchip Technology Inc.
PIC16(L)F1508/9
32.3 Package Details
The following sections give the technical details of the packages.
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2011-2013 Microchip Technology Inc.
DS40001609B-page 399
PIC16(L)F1508/9
Note: For the most current package drawings, please see the Microchip Packaging Specification located at
http://www.microchip.com/packaging
DS40001609B-page 400
2011-2013 Microchip Technology Inc.
PIC16(L)F1508/9
Note: For the most current package drawings, please see the Microchip Packaging Specification located at
http://www.microchip.com/packaging
2011-2013 Microchip Technology Inc.
DS40001609B-page 401
PIC16(L)F1508/9
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ꢔꢄꢌꢉꢋꢌꢍꢄꢓ ꢙꢈꢌꢍꢅꢋꢇꢋꢑꢊ ꢒꢉꢆ*ꢄꢅꢑ ,ꢕꢖꢞꢕꢜꢎ1
DS40001609B-page 402
2011-2013 Microchip Technology Inc.
PIC16(L)F1508/9
Note: For the most current package drawings, please see the Microchip Packaging Specification located at
http://www.microchip.com/packaging
2011-2013 Microchip Technology Inc.
DS40001609B-page 403
PIC16(L)F1508/9
ꢀꢁꢂꢃꢄꢅꢆꢇꢈꢉꢅꢊꢋꢌꢍꢇ'ꢏꢅꢆꢇ(ꢉꢅꢋ)ꢇꢛꢗꢇꢃꢄꢅꢆꢇꢈꢅꢍ#ꢅ*ꢄꢇꢒ+ꢃꢓꢇMꢇ,-,-ꢁ&.ꢇꢕꢕꢇꢖꢗꢆꢘꢇꢙ'(ꢛꢚ
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ꢝ.32 ꢝꢈ%ꢈꢉꢈꢅꢌꢈꢀꢒꢄ'ꢈꢅ!ꢄꢋꢅ(ꢀ"!"ꢆꢇꢇꢊꢀ*ꢄ&ꢍꢋ"&ꢀ&ꢋꢇꢈꢉꢆꢅꢌꢈ(ꢀ%ꢋꢉꢀꢄꢅ%ꢋꢉ'ꢆ&ꢄꢋꢅꢀꢓ"ꢉꢓꢋ!ꢈ!ꢀꢋꢅꢇꢊꢂ
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DS40001609B-page 404
2011-2013 Microchip Technology Inc.
PIC16(L)F1508/9
ꢛꢗꢋꢄꢜ 3ꢋꢉꢀ&ꢍꢈꢀ'ꢋ!&ꢀꢌ"ꢉꢉꢈꢅ&ꢀꢓꢆꢌ4ꢆꢑꢈꢀ#ꢉꢆ*ꢄꢅꢑ!(ꢀꢓꢇꢈꢆ!ꢈꢀ!ꢈꢈꢀ&ꢍꢈꢀꢔꢄꢌꢉꢋꢌꢍꢄꢓꢀꢃꢆꢌ4ꢆꢑꢄꢅꢑꢀꢐꢓꢈꢌꢄ%ꢄꢌꢆ&ꢄꢋꢅꢀꢇꢋꢌꢆ&ꢈ#ꢀꢆ&ꢀ
ꢍ&&ꢓ255***ꢂ'ꢄꢌꢉꢋꢌꢍꢄꢓꢂꢌꢋ'5ꢓꢆꢌ4ꢆꢑꢄꢅꢑ
2011-2013 Microchip Technology Inc.
DS40001609B-page 405
PIC16(L)F1508/9
NOTES:
DS40001609B-page 406
2011-2013 Microchip Technology Inc.
PIC16(L)F1508/9
APPENDIX A: DATA SHEET
REVISION HISTORY
Revision A (10/2011)
Original release.
Revision B (6/2013)
Updated Electrical Specifications and added
Characterization Data.
2011-2013 Microchip Technology Inc.
DS40001609B-page 407
PIC16(L)F1508/9
NOTES:
DS40001609B-page 408
2011-2013 Microchip Technology Inc.
PIC16(L)F1508/9
INDEX
ADC.......................................................................... 133
ADC Transfer Function............................................. 145
Analog Input Model........................................... 145, 153
Block Diagrams
A
Absolute Maximum Ratings .............................................. 321
AC Characteristics
Load Conditions........................................................ 333
ACKSTAT ......................................................................... 215
ACKSTAT Status Flag ...................................................... 215
ADC .................................................................................. 133
Acquisition Requirements ......................................... 144
Associated registers.................................................. 146
Block Diagram........................................................... 133
Calculating Acquisition Time..................................... 144
Channel Selection..................................................... 134
Configuration............................................................. 134
Configuring Interrupt ................................................. 138
Conversion Clock...................................................... 134
Conversion Procedure .............................................. 138
Internal Sampling Switch (RSS) Impedance.............. 144
Interrupts................................................................... 136
Operation .................................................................. 137
Operation During Sleep ............................................ 137
Port Configuration..................................................... 134
Reference Voltage (VREF)......................................... 134
Source Impedance.................................................... 144
Specifications............................................................ 342
Starting an ADC Conversion..................................... 136
ADCON0 Register....................................................... 27, 139
ADCON1 Register....................................................... 27, 140
ADCON2 Register....................................................... 27, 141
ADDFSR ........................................................................... 311
ADDWFC .......................................................................... 311
ADRESH Register (ADFM = 0)......................................... 142
ADRESH Register (ADFM = 1)......................................... 143
ADRESL Register ............................................................... 27
ADRESL Register (ADFM = 0).......................................... 142
ADRESL Register (ADFM = 1).......................................... 143
Alternate Pin Function....................................................... 110
Analog-to-Digital Converter. See ADC
PIC16(L)1508/9.................................................... 3
Clock Source .............................................................. 48
Comparator............................................................... 151
Crystal Operation.................................................. 50, 51
Digital-to-Analog Converter (DAC) ........................... 147
EUSART Receive..................................................... 236
EUSART Transmit.................................................... 235
External RC Mode ...................................................... 51
Fail-Safe Clock Monitor (FSCM)................................. 58
Generic I/O Port........................................................ 109
Interrupt Logic............................................................. 71
NCO.......................................................................... 286
On-Chip Reset Circuit................................................. 63
PIC16(L)F1508/9.......................................................... 8
PWM......................................................................... 263
Resonator Operation .................................................. 50
Timer0 ...................................................................... 159
Timer1 ...................................................................... 163
Timer1 Gate.............................................. 168, 169, 170
Timer2 ...................................................................... 175
Voltage Reference.................................................... 129
BORCON Register.............................................................. 65
BRA .................................................................................. 312
Break Character (12-bit) Transmit and Receive ............... 256
Brown-Out Reset (BOR)..................................................... 65
Specifications ........................................................... 338
Timing and Characteristics....................................... 337
BRW ................................................................................. 312
C
C Compilers
MPLAB C18.............................................................. 394
CALL................................................................................. 313
CALLW ............................................................................. 313
CLCDATA Register........................................................... 283
CLCxCON Register .......................................................... 275
CLCxGLS0 Register ......................................................... 279
CLCxGLS1 Register ......................................................... 280
CLCxGLS2 Register ......................................................... 281
CLCxGLS3 Register ......................................................... 282
CLCxPOL Register ........................................................... 276
CLCxSEL0 Register.......................................................... 277
Clock Accuracy with Asynchronous Operation................. 244
Clock Sources
External Modes........................................................... 49
EC ...................................................................... 49
HS ...................................................................... 49
LP....................................................................... 49
OST .................................................................... 50
RC ...................................................................... 51
XT....................................................................... 49
Internal Modes............................................................ 52
FRC.................................................................... 52
HFINTOSC ......................................................... 52
Internal Oscillator Clock Switch Timing.............. 53
LFINTOSC.......................................................... 52
Clock Switching .................................................................. 55
CMOUT Register.............................................................. 156
CMxCON0 Register.......................................................... 155
CMxCON1 Register.......................................................... 156
ANSELA Register ............................................................. 113
ANSELB Register ............................................................. 117
ANSELC Register ............................................................. 121
APFCON Register............................................................. 110
Assembler
MPASM Assembler................................................... 394
Automatic Context Saving................................................... 75
B
Bank 10............................................................................... 30
Bank 11............................................................................... 30
Bank 12............................................................................... 30
Bank 13............................................................................... 30
Bank 2................................................................................. 28
Bank 3................................................................................. 28
Bank 30............................................................................... 31
Bank 4................................................................................. 29
Bank 5................................................................................. 29
Bank 6................................................................................. 29
Bank 7................................................................................. 29
Bank 8................................................................................. 29
Bank 9................................................................................. 29
BAUDCON Register.......................................................... 247
BF ............................................................................. 215, 217
BF Status Flag .......................................................... 215, 217
Block Diagrams
2011-2013 Microchip Technology Inc.
DS40001609B-page 409
PIC16(L)F1508/9
Code Examples
Receive .................................................... 243
Transmit.................................................... 239
Auto-Wake-up on Break ................................... 254
Baud Rate Generator (BRG) ............................ 248
Clock Accuracy................................................. 244
Receiver ........................................................... 240
Setting up 9-bit Mode with Address Detect ...... 242
Transmitter ....................................................... 237
Baud Rate Generator (BRG)
Auto Baud Rate Detect..................................... 253
Baud Rate Error, Calculating............................ 248
Baud Rates, Asynchronous Modes .................. 250
Formulas........................................................... 249
High Baud Rate Select (BRGH Bit) .................. 248
Synchronous Master Mode............................... 257, 261
Associated Registers
ADC Conversion .......................................................138
Initializing PORTA.....................................................111
Writing to Flash Program Memory ............................102
Comparator
Associated Registers ................................................157
Operation ..................................................................151
Comparator Module ..........................................................151
Cx Output State Versus Input Conditions .................153
Comparator Specifications................................................343
Comparators
C2OUT as T1 Gate...................................................165
Complementary Waveform Generator (CWG).......... 293, 294
CONFIG1 Register..............................................................42
CONFIG2 Register..............................................................44
Core Function Register .......................................................26
Customer Change Notification Service .............................415
Customer Notification Service...........................................415
Customer Support.............................................................415
CWG
Auto-shutdown Control .............................................297
Clock Source.............................................................293
Output Control...........................................................293
Selectable Input Sources..........................................293
CWGxCON0 Register .......................................................300
CWGxCON1 Register .......................................................301
CWGxCON2 Register .......................................................302
CWGxDBF Register..........................................................303
CWGxDBR Register..........................................................303
Receive .................................................... 260
Transmit.................................................... 258
Reception ......................................................... 259
Transmission .................................................... 257
Synchronous Slave Mode
Associated Registers
Receive .................................................... 262
Transmit.................................................... 261
Reception ......................................................... 262
Transmission .................................................... 261
F
Fail-Safe Clock Monitor ...................................................... 58
Fail-Safe Condition Clearing....................................... 58
Fail-Safe Detection ..................................................... 58
Fail-Safe Operation..................................................... 58
Reset or Wake-up from Sleep .................................... 59
Firmware Instructions ....................................................... 307
Fixed Voltage Reference (FVR)........................................ 129
Associated Registers................................................ 130
Flash Program Memory ...................................................... 93
Associated Registers................................................ 108
Configuration Word w/ Flash Program Memory........ 108
Erasing ....................................................................... 97
Modifying .................................................................. 103
Write Verify............................................................... 105
Writing ........................................................................ 99
FSR Register ...................................................................... 26
FVRCON (Fixed Voltage Reference Control) Register..... 130
D
DACxCON0 (Digital-to-Analog Converter Control 0)
Register.....................................................................149
DACxCON1 (Digital-to-Analog Converter Control 1)
Register.....................................................................149
Data Memory.......................................................................18
DC and AC Characteristics ...............................................351
DC Characteristics
Extended and Industrial ............................................330
Industrial and Extended ............................................323
Development Support .......................................................393
Device Configuration...........................................................41
Code Protection ..........................................................45
Configuration Word.....................................................41
User ID..................................................................45, 46
Device ID Register ..............................................................46
Device Overview .............................................................7, 89
Digital-to-Analog Converter (DAC)....................................147
Associated Registers ................................................149
Effects of a Reset......................................................147
Specifications............................................................343
I
I2C Mode (MSSPx)
Acknowledge Sequence Timing ............................... 219
Bus Collision
During a Repeated Start Condition................... 224
During a Stop Condition ................................... 225
Effects of a Reset ..................................................... 220
I2C Clock Rate w/BRG.............................................. 227
Master Mode
Operation.......................................................... 211
Reception ......................................................... 217
Start Condition Timing.............................. 213, 214
Transmission .................................................... 215
Multi-Master Communication, Bus Collision and
Arbitration ......................................................... 220
Multi-Master Mode.................................................... 220
Read/Write Bit Information (R/W Bit)........................ 195
Slave Mode
E
Effects of Reset
PWM mode ...............................................................265
Electrical Specifications ....................................................321
Enhanced Mid-Range CPU.................................................13
Enhanced Universal Synchronous Asynchronous
Receiver Transmitter (EUSART)...............................235
Errata ....................................................................................6
EUSART............................................................................235
Associated Registers
Baud Rate Generator........................................249
Asynchronous Mode .................................................237
12-bit Break Transmit and Receive...................256
Associated Registers
Transmission .................................................... 201
Sleep Operation........................................................ 220
DS40001609B-page 410
2011-2013 Microchip Technology Inc.
PIC16(L)F1508/9
Stop Condition Timing............................................... 219
INDF Register ..................................................................... 26
Indirect Addressing ............................................................. 36
Instruction Format............................................................. 308
Instruction Set................................................................... 307
ADDLW..................................................................... 311
ADDWF..................................................................... 311
ADDWFC .................................................................. 311
ANDLW..................................................................... 311
ANDWF..................................................................... 311
BCF........................................................................... 312
BRA........................................................................... 312
BRW.......................................................................... 312
BSF........................................................................... 312
BTFSC ...................................................................... 312
BTFSS ...................................................................... 312
CALL......................................................................... 313
CALLW...................................................................... 313
CLRF......................................................................... 313
CLRW ....................................................................... 313
CLRWDT................................................................... 313
COMF ....................................................................... 313
DECF ........................................................................ 313
DECFSZ.................................................................... 314
GOTO ....................................................................... 314
INCF.......................................................................... 314
INCFSZ..................................................................... 314
IORLW ...................................................................... 314
IORWF...................................................................... 314
LSLF ......................................................................... 315
LSRF......................................................................... 315
MOVF........................................................................ 315
MOVIW ..................................................................... 316
MOVLB ..................................................................... 316
MOVLP ..................................................................... 316
MOVLW .................................................................... 316
MOVWF .................................................................... 316
MOVWI ..................................................................... 317
NOP .......................................................................... 317
OPTION .................................................................... 317
RESET...................................................................... 317
RETFIE ..................................................................... 318
RETLW ..................................................................... 318
RETURN................................................................... 318
RLF ........................................................................... 318
RRF........................................................................... 319
SLEEP ...................................................................... 319
SUBLW ..................................................................... 319
SUBWF..................................................................... 319
SUBWFB................................................................... 319
SWAPF ..................................................................... 320
TRIS.......................................................................... 320
XORLW..................................................................... 320
XORWF..................................................................... 320
INTCON Register................................................................ 76
Internal Oscillator Block
Configuration Word w/ Clock Sources........................ 62
TMR1........................................................................ 167
INTOSC Specifications..................................................... 335
IOCAF Register ................................................................ 125
IOCAN Register................................................................ 125
IOCAP Register................................................................ 125
IOCBF Register ................................................................ 126
IOCBN Register................................................................ 126
IOCBP Register................................................................ 126
L
LATA Register .......................................................... 113, 120
LATB Register .................................................................. 117
Load Conditions................................................................ 333
LSLF ................................................................................. 315
LSRF ................................................................................ 315
M
Master Synchronous Serial Port. See MSSPx
MCLR ................................................................................. 66
Internal........................................................................ 66
Memory Organization ......................................................... 15
Data............................................................................ 18
Program...................................................................... 15
Microchip Internet Web Site.............................................. 415
MOVIW............................................................................. 316
MOVLB............................................................................. 316
MOVLP............................................................................. 316
MOVWI............................................................................. 317
MPLAB ASM30 Assembler, Linker, Librarian................... 394
MPLAB Integrated Development Environment Software.. 393
MPLAB PM3 Device Programmer .................................... 395
MPLAB REAL ICE In-Circuit Emulator System ................ 395
MPLINK Object Linker/MPLIB Object Librarian................ 394
MSSPx.............................................................................. 179
SPI Mode.................................................................. 182
SSPxBUF Register................................................... 186
SSPxSR Register ..................................................... 186
N
NCO
Associated registers ................................................. 291
NCOxACCH Register ....................................................... 290
NCOxACCL Register........................................................ 290
NCOxACCU Register ....................................................... 290
NCOxCLK Register........................................................... 289
NCOxCON Register.......................................................... 289
NCOxINCH Register......................................................... 291
NCOxINCL Register ......................................................... 291
Numerically Controlled Oscillator (NCO) .......................... 285
O
OPCODE Field Descriptions............................................. 307
OPTION............................................................................ 317
OPTION Register.............................................................. 161
OSCCON Register.............................................................. 60
Oscillator
INTOSC
Associated Registers.................................................. 62
Associated registers ................................................. 304
Oscillator Module................................................................ 47
ECH............................................................................ 47
ECL............................................................................. 47
ECM............................................................................ 47
HS............................................................................... 47
INTOSC...................................................................... 47
LP ............................................................................... 47
Specifications.................................................... 335
Internal Sampling Switch (RSS) Impedance...................... 144
Internet Address................................................................ 415
Interrupt-On-Change......................................................... 123
Associated Registers ................................................ 127
Interrupts............................................................................. 71
ADC .......................................................................... 138
Associated registers w/ Interrupts............................... 83
2011-2013 Microchip Technology Inc.
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PIC16(L)F1508/9
RC...............................................................................47
XT ...............................................................................47
Oscillator Parameters........................................................335
Oscillator Specifications....................................................334
Oscillator Start-up Timer (OST)
PWM Mode
Duty Cycle ........................................................ 264
Effects of Reset ................................................ 265
Example PWM Frequencies and
Resolutions, 20 MHZ................................ 265
Specifications............................................................338
Oscillator Switching
Example PWM Frequencies and
Resolutions, 8 MHz .................................. 265
Fail-Safe Clock Monitor...............................................58
Two-Speed Clock Start-up..........................................56
OSCSTAT Register.............................................................61
Operation in Sleep Mode.................................. 265
Setup for Operation using PWMx pins ............. 266
System Clock Frequency Changes .................. 265
PWM Period.............................................................. 264
Setup for PWM Operation using PWMx Pins ........... 266
PWMxCON Register......................................................... 267
PWMxDCH Register......................................................... 268
PWMxDCL Register.......................................................... 268
P
Packaging .........................................................................397
Marking ............................................................. 397, 398
PDIP Details..............................................................399
PCL and PCLATH...............................................................13
PCL Register.......................................................................26
PCLATH Register................................................................26
PCON Register ............................................................. 27, 69
PIE1 Register................................................................27, 77
PIE2 Register................................................................27, 78
PIE3 Register................................................................27, 79
Pinout Descriptions
R
RCREG............................................................................. 242
RCREG Register ................................................................ 28
RCSTA Register ......................................................... 28, 246
Reader Response............................................................. 416
Read-Modify-Write Operations ......................................... 307
Registers
PIC16(L)F1508/9 ..........................................................9
PIR1 Register................................................................27, 80
PIR2 Register................................................................27, 81
PIR3 Register................................................................27, 82
PMADR Registers...............................................................93
PMADRH Registers ............................................................93
PMADRL Register.............................................................106
PMADRL Registers.............................................................93
PMCON1 Register ...................................................... 93, 107
PMCON2 Register ...................................................... 93, 108
PMDATH Register.............................................................106
PMDATL Register .............................................................106
PMDRH Register...............................................................106
PORTA..............................................................................111
Associated Registers ................................................114
LATA Register.............................................................28
PORTA Register .........................................................27
Specifications............................................................336
PORTA Register ...............................................................112
PORTB..............................................................................115
Associated Registers ................................................118
LATB Register.............................................................28
PORTB Register .........................................................27
PORTB Register ...............................................................116
PORTC
Associated Registers ................................................121
LATC Register ............................................................28
Pin Descriptions and Diagrams.................................119
PORTC Register.........................................................27
PORTC Register ...............................................................120
Power-Down Mode (Sleep).................................................85
Associated Registers ..................................................87
Power-on Reset ..................................................................64
Power-up Timer (PWRT).....................................................64
Specifications............................................................338
PR2 Register.......................................................................27
Program Memory ................................................................15
Map and Stack (PIC16(L)F1508 .................................16
Map and Stack (PIC16(L)F1509 .................................16
Programming Mode Exit......................................................66
Programming, Device Instructions ....................................307
Pulse Width Modulation (PWM) ........................................263
Associated registers w/ PWM ...................................268
ADCON0 (ADC Control 0)........................................ 139
ADCON1 (ADC Control 1)........................................ 140
ADCON2 (ADC Control 2)........................................ 141
ADRESH (ADC Result High) with ADFM = 0) .......... 142
ADRESH (ADC Result High) with ADFM = 1) .......... 143
ADRESL (ADC Result Low) with ADFM = 0)............ 142
ADRESL (ADC Result Low) with ADFM = 1)............ 143
ANSELA (PORTA Analog Select)............................. 113
ANSELB (PORTB Analog Select)............................. 117
ANSELC (PORTC Analog Select) ............................ 121
APFCON (Alternate Pin Function Control) ............... 110
BAUDCON (Baud Rate Control)............................... 247
BORCON (Brown-out Reset Control)......................... 65
CLCDATA (Data Output).......................................... 283
CLCxCON (CLCx Control)........................................ 275
CLCxGLS0 (Gate 1 Logic Select)............................. 279
CLCxGLS1 (Gate 2 Logic Select)............................. 280
CLCxGLS2 (Gate 3 Logic Select)............................. 281
CLCxGLS3 (Gate 4 Logic Select)............................. 282
CLCxPOL (Signal Polarity Control)........................... 276
CLCxSEL0 (Multiplexer Data 1 and 2 Select)........... 277
CMOUT (Comparator Output) .................................. 156
CMxCON0 (Cx Control)............................................ 155
CMxCON1 (Cx Control 1)......................................... 156
Configuration Word 1.................................................. 42
Configuration Word 2.................................................. 44
Core Function, Summary............................................ 26
CWGxCON0 (CWG Control 0) ................................. 300
CWGxCON1 (CWG Control 1) ................................. 301
CWGxCON2 (CWG Control 1) ................................. 302
CWGxDBF (CWGx Dead Band Falling Count)......... 303
CWGxDBR (CWGx Dead Band Rising Count)......... 303
DACxCON0 .............................................................. 149
DACxCON1 .............................................................. 149
Device ID.................................................................... 46
FVRCON................................................................... 130
INTCON (Interrupt Control)......................................... 76
IOCAF (Interrupt-on-Change PORTA Flag).............. 125
IOCAN (Interrupt-on-Change PORTA
Negative Edge)................................................. 125
IOCAP (Interrupt-on-Change PORTA
Positive Edge) .................................................. 125
IOCBF (Interrupt-on-Change PORTB Flag).............. 126
DS40001609B-page 412
2011-2013 Microchip Technology Inc.
PIC16(L)F1508/9
IOCBN (Interrupt-on-Change PORTB
Negative Edge)................................................. 126
IOCBP (Interrupt-on-Change PORTB
Associated Registers.................................................. 70
Revision History................................................................ 407
S
Positive Edge)................................................... 126
LATA (Data Latch PORTA)....................................... 113
LATB (Data Latch PORTB)....................................... 117
LATC (Data Latch PORTC) ...................................... 120
NCOxACCH (NCOx Accumulator High Byte) ........... 290
NCOxACCL (NCOx Accumulator Low Byte)............. 290
NCOxACCU (NCOx Accumulator Upper Byte)......... 290
NCOxCLK (NCOx Clock Control) ............................. 289
NCOxCON (NCOx Control) ...................................... 289
NCOxINCH (NCOx Increment High Byte)................. 291
NCOxINCL (NCOx Increment Low Byte).................. 291
OPTION_REG (OPTION) ......................................... 161
OSCCON (Oscillator Control) ..................................... 60
OSCSTAT (Oscillator Status) ..................................... 61
PCON (Power Control Register)................................. 69
PCON (Power Control) ............................................... 69
PIE1 (Peripheral Interrupt Enable 1)........................... 77
PIE2 (Peripheral Interrupt Enable 2)........................... 78
PIE3 (Peripheral Interrupt Enable 3)........................... 79
PIR1 (Peripheral Interrupt Register 1) ........................ 80
PIR2 (Peripheral Interrupt Request 2) ........................ 81
PIR3 (Peripheral Interrupt Request 3) ........................ 82
PMADRL (Program Memory Address)...................... 106
PMCON1 (Program Memory Control 1).................... 107
PMCON2 (Program Memory Control 2).................... 108
PMDATH (Program Memory Data)........................... 106
PMDATL (Program Memory Data)............................ 106
PMDRH (Program Memory Address) ....................... 106
PORTA...................................................................... 112
PORTB...................................................................... 116
PORTC ..................................................................... 120
PWMxCON (PWM Control)....................................... 267
PWMxDCH (PWM Control)....................................... 268
PWMxDCL (PWM Control) ....................................... 268
RCREG..................................................................... 253
RCSTA (Receive Status and Control)....................... 246
SPBRGH................................................................... 248
SPBRGL ................................................................... 248
Special Function, Summary........................................ 27
SSPxADD (MSSPx Address and Baud Rate,
Software Simulator (MPLAB SIM) .................................... 395
SPBRG Register................................................................. 28
SPBRGH Register............................................................ 248
SPBRGL Register............................................................. 248
Special Function Registers (SFRs)..................................... 27
SPI Mode (MSSPx)
Associated Registers................................................ 190
SPI Clock.................................................................. 186
SSPOV ............................................................................. 217
SSPOV Status Flag.......................................................... 217
SSPxADD Register........................................................... 233
SSPxCON1 Register ........................................................ 230
SSPxCON2 Register ........................................................ 231
SSPxCON3 Register ........................................................ 232
SSPxMSK Register........................................................... 233
SSPxSTAT Register ......................................................... 228
R/W Bit ..................................................................... 195
Stack................................................................................... 34
Accessing ................................................................... 34
Reset .......................................................................... 36
Stack Overflow/Underflow .................................................. 66
Standard Operating Conditions ........................................ 321
STATUS Register ............................................................... 19
SUBWFB .......................................................................... 319
T
T1CON Register ......................................................... 27, 171
T1GCON Register ............................................................ 172
T2CON (Timer2) Register................................................. 177
T2CON Register ................................................................. 27
Temperature Indicator
Associated Registers................................................ 132
Temperature Indicator Module.......................................... 131
Thermal Considerations.................................................... 332
Timer0 .............................................................................. 159
Associated Registers................................................ 161
Operation.................................................................. 159
Specifications ........................................................... 339
Timer1 ...................................................................... 162, 163
Associated registers ................................................. 173
Asynchronous Counter Mode................................... 165
Reading and Writing......................................... 165
Clock Source Selection ............................................ 164
Interrupt .................................................................... 167
Operation.................................................................. 164
Operation During Sleep............................................ 167
Prescaler .................................................................. 165
Specifications ........................................................... 339
Timer1 Gate
I2C Mode) ......................................................... 233
SSPxCON1 (MSSPx Control 1)................................ 230
SSPxCON2 (SSPx Control 2)................................... 231
SSPxCON3 (SSPx Control 3)................................... 232
SSPxMSK (SSPx Mask) ........................................... 233
SSPxSTAT (SSPx Status) ........................................ 228
STATUS...................................................................... 19
T1CON (Timer1 Control)........................................... 171
T1GCON (Timer1 Gate Control)............................... 172
T2CON...................................................................... 177
TRISA (Tri-State PORTA)......................................... 112
TRISB (Tri-State PORTB)......................................... 116
TRISC (Tri-State PORTC) ........................................ 120
TXSTA (Transmit Status and Control) ...................... 245
VREGCON (Voltage Regulator Control)..................... 87
WDTCON (Watchdog Timer Control) ......................... 91
WPUA (Weak Pull-up PORTA)................................. 114
WPUB (Weak Pull-up PORTB)................................. 118
RESET .............................................................................. 317
Reset................................................................................... 63
Reset Instruction................................................................. 66
Resets................................................................................. 63
Selecting Source .............................................. 165
TMR1H Register....................................................... 163
TMR1L Register ....................................................... 163
Timer2 .............................................................................. 175
Associated registers ................................................. 177
Timers
Timer1
T1CON ............................................................. 171
T1GCON........................................................... 172
Timer2
T2CON ............................................................. 177
Timing Diagrams
Acknowledge Sequence........................................... 219
2011-2013 Microchip Technology Inc.
DS40001609B-page 413
PIC16(L)F1508/9
ADC Conversion .......................................................342
Asynchronous Reception..........................................242
Asynchronous Transmission.....................................238
Asynchronous Transmission (Back to Back) ............238
Auto Wake-up Bit (WUE) During Normal Operation .255
Auto Wake-up Bit (WUE) During Sleep ....................255
Automatic Baud Rate Calibration..............................253
Baud Rate Generator with Clock Arbitration.............212
BRG Reset Due to SDA Arbitration During Start
Condition...........................................................223
Brown-Out Reset (BOR) ...........................................337
Brown-out Reset Situations ........................................65
Bus Collision During a Repeated Start Condition
TRISB Register........................................................... 27, 116
TRISC............................................................................... 119
TRISC Register........................................................... 27, 120
Two-Speed Clock Start-up Mode........................................ 56
TXREG ............................................................................. 237
TXREG Register................................................................. 28
TXSTA Register.......................................................... 28, 245
BRGH Bit .................................................................. 248
U
USART
Synchronous Master Mode
Requirements, Synchronous Receive .............. 344
Requirements, Synchronous Transmission...... 344
Timing Diagram, Synchronous Receive ........... 344
Timing Diagram, Synchronous Transmission... 344
(Case 1) ............................................................224
Bus Collision During a Repeated Start Condition
(Case 2) ............................................................224
Bus Collision During a Start Condition (SCL = 0) .....223
Bus Collision During a Stop Condition (Case 1) .......225
Bus Collision During a Stop Condition (Case 2) .......225
Bus Collision During Start Condition (SDA only) ......222
Bus Collision for Transmit and Acknowledge............221
CLC Propagation Timing...........................................340
CLKOUT and I/O.......................................................336
Clock Synchronization ..............................................209
Clock Timing .............................................................333
Comparator Output ...................................................152
Fail-Safe Clock Monitor (FSCM).................................59
First Start Bit Timing .................................................213
I2C Bus Data.............................................................348
I2C Bus Start/Stop Bits..............................................348
I2C Master Mode (7 or 10-Bit Transmission) ............216
I2C Master Mode (7-Bit Reception)...........................218
I2C Stop Condition Receive or Transmit Mode .........220
INT Pin Interrupt..........................................................74
Internal Oscillator Switch Timing.................................54
Repeat Start Condition..............................................214
Reset Start-up Sequence............................................67
Reset, WDT, OST and Power-up Timer ...................337
Send Break Character Sequence .............................256
SPI Master Mode (CKE = 1, SMP = 1) .....................345
SPI Mode (Master Mode)..........................................186
SPI Slave Mode (CKE = 0) .......................................346
SPI Slave Mode (CKE = 1) .......................................346
Synchronous Reception (Master Mode, SREN) .......260
Synchronous Transmission.......................................258
Synchronous Transmission (Through TXEN) ...........258
T2_match..................................................................176
Timer0 and Timer1 External Clock ...........................339
Timer1 Incrementing Edge........................................167
Timer2.......................................................................175
Two-Speed Start-up....................................................57
USART Synchronous Receive (Master/Slave) .........344
USART Synchronous Transmission (Master/Slave) .344
Wake-up from Interrupt ...............................................86
Timing Parameter Symbology...........................................333
Timing Requirements
V
VREF. SEE ADC Reference Voltage
VREGCON Register ........................................................... 87
W
Wake-up on Break............................................................ 254
Wake-up Using Interrupts................................................... 85
Watchdog Timer ................................................................. 89
Watchdog Timer (WDT)...................................................... 66
Associated Registers.................................................. 92
Modes......................................................................... 90
Specifications ........................................................... 338
WCOL....................................................... 212, 215, 217, 219
WCOL Status Flag.................................... 212, 215, 217, 219
WDTCON Register ............................................................. 91
WPUA Register................................................................. 114
WPUB Register................................................................. 118
Write Protection .................................................................. 45
WWW Address ................................................................. 415
WWW, On-Line Support ................................................... 2, 6
I2C Bus Data.............................................................349
I2C Bus Start/Stop Bits .............................................348
SPI Mode ..................................................................347
TMR0 Register....................................................................27
TMR1H Register .................................................................27
TMR1L Register..................................................................27
TMR2 Register....................................................................27
TRIS..................................................................................320
TRISA Register ........................................................... 27, 112
DS40001609B-page 414
2011-2013 Microchip Technology Inc.
PIC16(L)F1508/9
THE MICROCHIP WEB SITE
CUSTOMER SUPPORT
Microchip provides online support via our WWW site at
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2011-2013 Microchip Technology Inc.
DS40001609B-page 415
PIC16(L)F1508/9
READER RESPONSE
It is our intention to provide you with the best documentation possible to ensure successful use of your Microchip
product. If you wish to provide your comments on organization, clarity, subject matter, and ways in which our
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Device: PIC16(L)F1508/9
Questions:
Literature Number:
DS40001609B
1. What are the best features of this document?
2. How does this document meet your hardware and software development needs?
3. Do you find the organization of this document easy to follow? If not, why?
4. What additions to the document do you think would enhance the structure and subject?
5. What deletions from the document could be made without affecting the overall usefulness?
6. Is there any incorrect or misleading information (what and where)?
7. How would you improve this document?
DS40001609B-page 416
2011-2013 Microchip Technology Inc.
PIC16(L)F1508/9
PRODUCT IDENTIFICATION SYSTEM
To order or obtain information, e.g., on pricing or delivery, refer to the factory or the listed sales office.
[X](1)
PART NO.
X
/XX
XXX
-
Examples:
Device Tape and Reel
Option
Temperature
Range
Package
Pattern
a)
PIC16LF1508T - I/SO
Tape and Reel,
Industrial temperature,
SOIC package
b)
c)
PIC16F1509 - I/P
Industrial temperature
PDIP package
Device:
PIC16F1508, PIC16LF1508,
PIC16F1509, PIC16LF1509
PIC16F1508 - E/ML 298
Extended temperature,
QFN package
Tape and Reel
Option:
Blank = Standard packaging (tube or tray)
T
= Tape and Reel(1)
QTP pattern #298
Temperature
Range:
I
E
=
=
-40C to +85C (Industrial)
-40C to +125C (Extended)
Package:(2)
ML
P
SO
SS
=
=
=
=
QFN
Plastic DIP
SOIC
SSOP
Note 1:
Tape and Reel identifier only appears in the
catalog part number description. This
identifier is used for ordering purposes and is
not printed on the device package. Check
with your Microchip Sales Office for package
availability with the Tape and Reel option.
Pattern:
QTP, SQTP, Code or Special Requirements
(blank otherwise)
2:
For other small form-factor package
availability and marking information, please
visit www.microchip.com/packaging or
contact your local sales office.
2011-2013 Microchip Technology Inc.
DS40001609B-page 417
PIC16(L)F1508/9
NOTES:
DS40001609B-page 418
2011-2013 Microchip Technology Inc.
Note the following details of the code protection feature on Microchip devices:
•
Microchip products meet the specification contained in their particular Microchip Data Sheet.
•
Microchip believes that its family of products is one of the most secure families of its kind on the market today, when used in the
intended manner and under normal conditions.
•
There are dishonest and possibly illegal methods used to breach the code protection feature. All of these methods, to our
knowledge, require using the Microchip products in a manner outside the operating specifications contained in Microchip’s Data
Sheets. Most likely, the person doing so is engaged in theft of intellectual property.
•
•
Microchip is willing to work with the customer who is concerned about the integrity of their code.
Neither Microchip nor any other semiconductor manufacturer can guarantee the security of their code. Code protection does not
mean that we are guaranteeing the product as “unbreakable.”
Code protection is constantly evolving. We at Microchip are committed to continuously improving the code protection features of our
products. Attempts to break Microchip’s code protection feature may be a violation of the Digital Millennium Copyright Act. If such acts
allow unauthorized access to your software or other copyrighted work, you may have a right to sue for relief under that Act.
Information contained in this publication regarding device
applications and the like is provided only for your convenience
and may be superseded by updates. It is your responsibility to
ensure that your application meets with your specifications.
MICROCHIP MAKES NO REPRESENTATIONS OR
WARRANTIES OF ANY KIND WHETHER EXPRESS OR
IMPLIED, WRITTEN OR ORAL, STATUTORY OR
OTHERWISE, RELATED TO THE INFORMATION,
INCLUDING BUT NOT LIMITED TO ITS CONDITION,
QUALITY, PERFORMANCE, MERCHANTABILITY OR
FITNESS FOR PURPOSE. Microchip disclaims all liability
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devices in life support and/or safety applications is entirely at
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hold harmless Microchip from any and all damages, claims,
suits, or expenses resulting from such use. No licenses are
conveyed, implicitly or otherwise, under any Microchip
intellectual property rights.
Trademarks
The Microchip name and logo, the Microchip logo, dsPIC,
FlashFlex, KEELOQ, KEELOQ logo, MPLAB, PIC, PICmicro,
PICSTART, PIC32 logo, rfPIC, SST, SST Logo, SuperFlash
and UNI/O are registered trademarks of Microchip
Technology Incorporated in the U.S.A. and other countries.
FilterLab, Hampshire, HI-TECH C, Linear Active Thermistor,
MTP, SEEVAL and The Embedded Control Solutions
Company are registered trademarks of Microchip Technology
Incorporated in the U.S.A.
Silicon Storage Technology is a registered trademark of
Microchip Technology Inc. in other countries.
Analog-for-the-Digital Age, Application Maestro, BodyCom,
chipKIT, chipKIT logo, CodeGuard, dsPICDEM,
dsPICDEM.net, dsPICworks, dsSPEAK, ECAN,
ECONOMONITOR, FanSense, HI-TIDE, In-Circuit Serial
Programming, ICSP, Mindi, MiWi, MPASM, MPF, MPLAB
Certified logo, MPLIB, MPLINK, mTouch, Omniscient Code
Generation, PICC, PICC-18, PICDEM, PICDEM.net, PICkit,
PICtail, REAL ICE, rfLAB, Select Mode, SQI, Serial Quad I/O,
Total Endurance, TSHARC, UniWinDriver, WiperLock, ZENA
and Z-Scale are trademarks of Microchip Technology
Incorporated in the U.S.A. and other countries.
SQTP is a service mark of Microchip Technology Incorporated
in the U.S.A.
GestIC and ULPP are registered trademarks of Microchip
Technology Germany II GmbH & Co. KG, a subsidiary of
Microchip Technology Inc., in other countries.
All other trademarks mentioned herein are property of their
respective companies.
© 2011-2013, Microchip Technology Incorporated, Printed in
the U.S.A., All Rights Reserved.
Printed on recycled paper.
ISBN: 9781620772621
QUALITY MANAGEMENT SYSTEM
CERTIFIED BY DNV
Microchip received ISO/TS-16949:2009 certification for its worldwide
headquarters, design and wafer fabrication facilities in Chandler and
Tempe, Arizona; Gresham, Oregon and design centers in California
and India. The Company’s quality system processes and procedures
are for its PIC® MCUs and dsPIC® DSCs, KEELOQ® code hopping
devices, Serial EEPROMs, microperipherals, nonvolatile memory and
analog products. In addition, Microchip’s quality system for the design
and manufacture of development systems is ISO 9001:2000 certified.
== ISO/TS 16949 ==
2011-2013 Microchip Technology Inc.
DS40001609B-page 419
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Taiwan - Taipei
Tel: 886-2-2508-8600
Fax: 886-2-2508-0102
Santa Clara
Santa Clara, CA
Tel: 408-961-6444
Fax: 408-961-6445
China - Xian
Tel: 86-29-8833-7252
Fax: 86-29-8833-7256
Thailand - Bangkok
Tel: 66-2-694-1351
Fax: 66-2-694-1350
Toronto
Mississauga, Ontario,
Canada
China - Xiamen
Tel: 905-673-0699
Fax: 905-673-6509
Tel: 86-592-2388138
Fax: 86-592-2388130
China - Zhuhai
Tel: 86-756-3210040
Fax: 86-756-3210049
11/29/12
DS40001609B-page 420
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