PMS171B_技术文档

PMS171B

8bit OTP MCU with 8-bit ADC

Datasheet

Version 1.03 – Sep. 2, 2020

6F-6, No.1, Sec. 3, Gongdao 5th Rd., Hsinchu City 30069, Taiwan, R.O.C.

TEL: 886-3-572-8688  www.padauk.com.tw

PMS171B

8bit OTP MCU with 8-bit ADC

IMPORTANT NOTICE

PADAUK Technology reserves the right to make changes to its products or to terminate

production of its products at any time without notice. Customers are strongly

recommended to contact PADAUK Technology for the latest information and verify

whether the information is correct and complete before placing orders.

PADAUK Technology products are not warranted to be suitable for use in life-support

applications or other critical applications. PADAUK Technology assumes no liability for

such applications. Critical applications include, but are not limited to, those which may

involve potential risks of death, personal injury, fire or severe property damage.

PADAUK Technology assumes no responsibility for any issue caused by a customer’s

product design. Customers should design and verify their products within the ranges

guaranteed by PADAUK Technology. In order to minimize the risks in customers’ products,

customers should design a product with adequate operating safeguards.

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PMS171B

8bit OTP MCU with 8-bit ADC

Table of content

1. Features.................................................................................................................................8

1.1.

1.2.

1.3.

1.4.

Special Features.....................................................................................................................8

System Features.....................................................................................................................8

CPU Features.........................................................................................................................8

Package Information ...............................................................................................................8

2. General Description and Block Diagram............................................................................9

3. Pin Definition and Functional Description .......................................................................10

4. Device Characteristics.......................................................................................................16

4.1.

4.2.

4.3.

4.4.

4.5.

4.6.

4.7.

4.8.

4.9.

AC/DC Device Characteristics ..............................................................................................16

Absolute Maximum Ratings...................................................................................................18

Typical ILRC frequency vs. VDD...........................................................................................18

Typical IHRC frequency deviation vs. VDD (calibrated to 16MHz).........................................19

Typical ILRC Frequency vs. Temperature.............................................................................19

Typical IHRC Frequency vs. Temperature (calibrated to 16MHz)..........................................20

Typical operating current vs. VDD @ system clock = ILRC/n................................................20

Typical operating current vs. VDD @ system clock = IHRC/n ...............................................21

Typical operating current vs. VDD @ system clock = 4MHz EOSC / n..................................21

4.10. Typical operating current vs. VDD @ system clock = 32KHz EOSC / n.................................22

4.11. Typical operating current vs. VDD @ system clock = 1MHz EOSC / n..................................22

4.12. Typical IO driving current (I_OH) and sink current (I_OL) .............................................................23

4.13. Typical IO input high/low threshold voltage (V_IH/V_IL) ..............................................................25

4.14. Typical resistance of IO pull high device ...............................................................................25

4.15. Typical resistance of IO pull Low device................................................................................26

4.16. Typical power down current (I_PD) and power save current (I_PS)..............................................27

5. Functional Description.......................................................................................................28

5.1.

5.2.

Program Memory - OTP........................................................................................................28

Boot Procedure.....................................................................................................................28

5.2.1. Timing charts for reset conditions.................................................................................29

Data Memory - SRAM...........................................................................................................30

Oscillator and clock...............................................................................................................30

5.4.1. Internal High RC oscillator and Internal Low RC oscillator.........................................30

5.4.2. Chip calibration..........................................................................................................30

5.4.3. IHRC Frequency Calibration and System Clock ........................................................31

5.4.4. External Crystal Oscillator .........................................................................................32

5.3.

5.4.

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8bit OTP MCU with 8-bit ADC

5.4.5. System Clock and LVR level .....................................................................................34

5.4.6. System Clock Switching ............................................................................................35

Comparator...........................................................................................................................36

5.5.1 Internal reference voltage (V_{internal R})...........................................................................37

5.5.2 Using the comparator ................................................................................................39

5.5.3 Using the comparator and bandgap 1.20V.................................................................40

16-bit Timer (Timer16) ..........................................................................................................41

8-bit Timer (Timer2/Timer3) with PWM generation................................................................42

5.7.1 Using the Timer2 to generate periodical waveform....................................................44

5.7.2 Using the Timer2 to generate 8-bit PWM waveform...................................................45

5.7.3 Using the Timer2 to generate 6-bit / 7-bit PWM waveform.........................................47

5.7.4 Complementary PWM with Dead Zones....................................................................48

WatchDog Timer...................................................................................................................51

Interrupt ................................................................................................................................52

5.5.

5.6

5.7

5.8

5.9

5.10 Power-Save and Power-Down ..............................................................................................54

5.10.1 Power-Save mode (“stopexe”)...................................................................................54

5.10.2 Power-Down mode (“stopsys”) ..................................................................................55

5.10.3 Wake-up....................................................................................................................56

5.11 IO Pins..................................................................................................................................56

5.12 Reset and LVR......................................................................................................................59

5.12.1 Reset.........................................................................................................................59

5.12.2 LVR reset ..................................................................................................................59

5.13 Analog-to-Digital Conversion (ADC) module .........................................................................59

5.13.1 The input requirement for AD conversion ..................................................................60

5.13.2 Select the reference high voltage ..............................................................................61

5.13.3 ADC clock selection...................................................................................................61

5.13.4 Configure the analog pins..........................................................................................61

5.13.5 Using the ADC...........................................................................................................62

5.13.6 How to calculate ADC input voltage V_IN.....................................................................63

6. IO Registers ........................................................................................................................64

6.1.

6.2.

6.3.

6.4.

6.5.

6.6.

6.7.

ACC Status Flag Register (flag), IO address = 0x00 .............................................................64

Stack Pointer Register (sp), IO address = 0x02 ....................................................................64

Clock Mode Register (clkmd), IO address = 0x03 .................................................................64

Interrupt Enable Register (inten), IO address = 0x04 ............................................................65

Interrupt Request Register (intrq), IO address = 0x05...........................................................65

Timer16 mode Register (t16m), IO address = 0x06...............................................................66

Timer2 Bound Register (tm2b), IO address = 0x09 ...............................................................66

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8bit OTP MCU with 8-bit ADC

6.8.

6.9.

External Oscillator setting Register (eoscr), IO address = 0x0a.............................................66

Interrupt Edge Select Register (integs), IO address = 0x0c...................................................67

6.10. Port A Digital Input Enable Register (padier), IO address = 0x0d..........................................67

6.11. Port B Digital Input Enable Register (pbdier), IO address = 0x0e..........................................67

6.12. Port A Data Register (pa), IO address = 0x10.......................................................................68

6.13. Port A Control Register (pac), IO address = 0x11 .................................................................68

6.14. Port A Pull-High Register (paph), IO address = 0x12 ............................................................68

6.15. Port B Data Register (pb), IO address = 0x14.......................................................................68

6.16. Port B Control Register (pbc), IO address = 0x15 .................................................................68

6.17. Port B Pull-High Register (pbph), IO address = 0x16 ............................................................68

6.18. Port B Pull Low Register (pbpl), IO address = 0x38 ..............................................................68

6.19. Miscellaneous Register (misc), IO address = 0x17................................................................69

6.20. Comparator Control Register (gpcc), IO address = 0x18.......................................................69

6.21. Comparator Selection Register (gpcs), IO address = 0x19....................................................70

6.22. Timer2 Control Register (tm2c), IO address = 0x1c ..............................................................70

6.23. Timer2 Counter Register (tm2ct), IO address = 0x1d............................................................71

6.24. Timer2 Scalar Register (tm2s), IO address = 0x1e................................................................71

6.25. Timer3 Control Register (tm3c), IO address = 0x32 ..............................................................71

6.26. Timer3 Counter Register (tm3ct), IO address = 0x33............................................................72

6.27. Timer3 Scalar Register (tm3s), IO address = 0x34................................................................72

6.28. Timer3 Bound Register (tm3b), IO address = 0x3f ................................................................72

6.29. ADC Control Register (adcc), IO address = 0x3b..................................................................72

6.30. ADC Mode Register (adcm), IO address = 0x3c....................................................................73

6.31. ADC Regulator Control Register (adcrgc), IO address = 0x3d...............................................73

6.32. ADC Result High Register (adcr), IO address = 0x3e............................................................73

7. Instructions.........................................................................................................................74

7.1.

7.2.

7.3.

7.4.

7.5.

7.6.

7.7.

7.8.

7.9.

Data Transfer Instructions.....................................................................................................75

Arithmetic Operation Instructions ..........................................................................................77

Shift Operation Instructions...................................................................................................79

Logic Operation Instructions..................................................................................................80

Bit Operation Instructions......................................................................................................82

Conditional Operation Instructions ........................................................................................83

System control Instructions ...................................................................................................84

Summary of Instructions Execution Cycle .............................................................................86

Summary of affected flags by Instructions.............................................................................86

7.10. BIT definition.........................................................................................................................86

8. Code Options......................................................................................................................87

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8bit OTP MCU with 8-bit ADC

9. Special Notes......................................................................................................................88

9.1.

9.2.

Warning ................................................................................................................................88

Using IC................................................................................................................................88

9.2.1. IO pin usage and setting............................................................................................88

9.2.2. Interrupt.....................................................................................................................89

9.2.3. System clock switching..............................................................................................89

9.2.4. Watchdog..................................................................................................................90

9.2.5. TIMER time out .........................................................................................................90

9.2.6. IHRC .........................................................................................................................90

9.2.7. LVR...........................................................................................................................91

9.2.8. Programming Writing.................................................................................................91

Using ICE..............................................................................................................................92

9.3

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8bit OTP MCU with 8-bit ADC

Revision History:

Revision

Date

Description

0.00

2018/10/11

Preliminary version

1. Amend 1.1 Special Features

1.00

1.01

2018/11/07

2. Amend Fig. 4: Hardware diagram of comparator

3. Amend 9.2.8 Programming Writing

1. Amend 5.7.1, 5.7.2, and 5.7.3

2. Add Section 5.7.4 Complementary PWM with Dead Zones

3. Add Fig.13 and Fig.14

2019/08/23

4. Amend Section 5.10.1 and 5.10.3

5. Amend Section 5.13.5 Using the ADC

6. Amend Chapter 8 Code Options

7. Amend 9.2.8 Programming Writing

1. Amend Section 4.1 AC/DC Device Characteristics: VIL

2. Amend Section 6.3 Clock Mode Register

1. Amend Section 4.1 AC/DC Device Characteristics: LVR%, I_OH, R_PH,R_PL

2. Update Section 4.3 to 4.16

1.02

1.03

2019/10/21

2020/09/02

3. Adjust Section 4.17 to 5.2.1

4. Amend Section 5.4.6, 5.5, 5.7, 6.21, 6.32, 9.2.7, 9.3

5. Add Section 5.13.6 How to calculate ADC input voltage V_IN

6. Amend Chapter 8

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PMS171B

8bit OTP MCU with 8-bit ADC

1. Features

1.1. Special Features

 General purpose OTP series

 Not supposed to use in AC RC step-down powered or high EFT requirement applications.

PADAUK assumes no liability if such kind of applications can not pass the safety regulation tests.

 Operating temperature range: -20°C ~ 70°C

1.2. System Features

 1.5KW OTP program memory

 96 Bytes data RAM

 Clock sources: internal high RC oscillator, internal low RC oscillator and external crystal oscillator

 Bandgap circuit to provide 1.20V reference voltage

 One hardware 16-bit timer

 Two hardware 8-bit timers with PWM generation

 One hardware comparator

 Up to 11-channel 8-bit resolution ADC with one channel comes from bandgap voltage

 Provide ADC reference high voltage: external input, internal V_DD

 Eight levels of LVR reset by code option: 4.0V, 3.5V, 3.0V, 2.7V, 2.5V, 2.2V, 2.0V, 1.8V

 Max. 14 IO pins with optional pull-high resistor, two of them with additional pull-low resistor

 PB0 provides NMOS and PB7 provides PMOS super large current output (typ. 135mA@V_DD=5.0V)

 Two selectable external interrupt pins by code option

 Every IO pin can be configured to enable wake-up function

 For every wake-up enabled IO, two optional wake-up speed are supported: normal and fast

1.3. CPU Features

 One processing unit operating mode

 82 powerful instructions

 Most instructions are 1T execution cycle

 Programmable stack pointer to provide adjustable stack level

 Support direct and indirect addressing modes for data access. Data memories are available for use as an

index pointer of Indirect addressing mode

 IO space and memory space are independent

1.4. Package Information

 PMS171B-S16: SOP16 (150mil)

 PMS171B-1J16A: QFN3*3-16pin (0.5pitch)

 PMS171B-S14: SOP14 (150mil)

 PMS171B-M10: MSOP10 (118mil)

 PMS171B-S08: SOP8 (150mil)

 PMS171B-U06: SOT23-6 (60mil)

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8bit OTP MCU with 8-bit ADC

2. General Description and Block Diagram

The PMS171B family is an ADC-Type, fully static, OTP-based CMOS 8-bit microcontroller. It employs RISC

architecture and all the instructions are executed in one cycle except that some instructions are two cycles that

handle indirect memory access.

1.5KW OTP program memory and 96 bytes data SRAM are inside, one up to 11 channels 8-bit ADC is built

inside the chip with one channel for internal bandgap reference voltage. PMS171B also provides three hardware

timers: one is 16-bit timer and two are 8-bit timers with PWM generation. PMS171B also supports one hardware

comparator and two super large current outputs.

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PMS171B

8bit OTP MCU with 8-bit ADC

3. Pin Definition and Functional Description

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8bit OTP MCU with 8-bit ADC

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PMS171B

8bit OTP MCU with 8-bit ADC

Pin Type &

Buffer Type

Pin Name

Description

The functions of this pin can be:

(1) Bit 7 of port A. It can be configured as digital input, two-state output with pull-high

resistor by software independently.

IO

PA7 /

X1

ST /

(2) X1 is Crystal XIN when crystal oscillator is used.

CMOS

If this pin is used for crystal oscillator, bit 7 of padier register must be programmed “0”

to avoid leakage current. This pin can be used to wake-up system during sleep mode;

however, wake-up function is also disabled if bit 7 of padier register is “0”.

The functions of this pin can be:

(1) Bit 6 of port A. It can be configured as digital input, two-state output with pull-high

resistor by software independently.

IO

PA6 /

X2

ST /

(2) X2 is Crystal XOUT when crystal oscillator is used.

CMOS

If this pin is used for crystal oscillator, bit 6 of padier register must be programmed “0”

to avoid leakage current. This pin can be used to wake-up system during sleep mode;

however, wake-up function is also disabled if bit 6 of padier register is “0”.

The functions of this pin can be:

(1) Bit 5 of port A. It can be configured as digital input or open-drain output with

pull-high resistor by software independently.

PA5 /

IO (OD)

ST /

PRSTB

(2) Hardware reset.

CMOS

This pin can be used to wake-up system during sleep mode; however, wake-up

function is also disabled if bit 5 of padier register is “0”. Please put 33Ω resistor in

series to have high noise immunity when this pin is in input mode.

The functions of this pin can be:

(1) Bit 4 of port A. It can be configured as digital input, two-state output with pull-high

resistor by software independently.

(2) Channel 9 of ADC analog input.

PA4 /

AD9 /

(3) Plus input source of comparator.

IO

(4) Minus input source 1 of comparator.

ST /

CIN+ /

CIN1- /

INT1A

(5) External interrupt line 1A. It can be used as an external interrupt line 1. Both rising

edge and falling edge are accepted to request interrupt service and configurable

by register setting.

CMOS /

Analog

When this pin is configured as analog input, please use bit 4 of register padier to

disable the digital input to prevent current leakage. The bit 4 of padier register can be

set to “0” to disable digital input; wake-up from power-down by toggling this pin is also

disabled.

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8bit OTP MCU with 8-bit ADC

Pin Type &

Buffer Type

Pin Name

Description

The functions of this pin can be:

(1) Bit 3 of port A. It can be configured as digital input, two-state output with pull-high

resistor independently by software.

PA3 /

AD8 /

IO

(2) Channel 8 of ADC analog input.

ST /

(3) Minus input source 0 of comparator.

CIN0- /

TM2PWM

CMOS /

Analog

(4) PWM output from Timer2.

When this pin is configured as analog input, please use bit 3 of register padier to

disable the digital input to prevent current leakage. The bit 3 of padier register can be

set to “0” to disable digital input; wake-up from power-down by toggling this pin is also

disabled.

The functions of this pin can be:

(1) Bit 0 of port A. It can be configured as digital input, two-state output with pull-high

resistor independently by software.

PA0 /

AD10 /

CO /

IO

(2) Channel 10 of ADC analog input.

ST /

(3) Output of comparator.

CMOS /

Analog

(4) External interrupt line 0. It can be used as an external interrupt line 0. Both rising

edge and falling edge are accepted to request interrupt service and configurable

by register setting.

INT0

The bit 0 of padier register can be set to “0” to disable wake-up from power-down by

toggling this pin.

The functions of this pin can be:

(1) Bit 7 of port B. It can be configured as digital input, two-state output with pull-high

resistor independently by software.

PB7 /

AD7 /

IO

(2) Channel 7 of ADC analog input.

ST /

(3) Minus input source 5 of comparator.

CIN5- /

TM3PWM

CMOS /

Analog

(4) PWM output from Timer3.

When this pin is configured as analog input, please use bit 7 of register pbdier to

disable the digital input to prevent current leakage. The bit 7 of pbdier register can be

set to “0” to disable digital input; wake-up from power-down by toggling this pin is also

disabled.

The functions of this pin can be:

(1) Bit 6 of port B. It can be configured as digital input, two-state output with pull-high

/ pull-low resistor independently by software.

PB6 /

AD6 /

IO

(2) Channel 6 of ADC analog input.

ST /

(3) Minus input source 4 of comparator.

CIN4- /

TM3PWM

CMOS /

Analog

(4) PWM output from Timer3.

When this pin is configured as analog input, please use bit 6 of register pbdier to

disable the digital input to prevent current leakage. The bit 6 of pbdier register can be

set to “0” to disable digital input; wake-up from power-down by toggling this pin is also

disabled.

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8bit OTP MCU with 8-bit ADC

Pin Type &

Buffer Type

Pin Name

Description

The functions of this pin can be:

(1) Bit 5 of port B. It can be configured as digital input, two-state output with pull-high

resistor independently by software.

(2) Channel 5 of ADC analog input.

PB5 /

AD5 /

IO

(3) PWM output from Timer3.

ST /

(4) External interrupt line 0A. It can be used as an external interrupt line 0. Both rising

edge and falling edge are accepted to request interrupt service and configurable

by register setting.

TM3PWM /

INT0A

CMOS /

Analog

When this pin is configured as analog input, please use bit 5 of register pbdier to

disable the digital input to prevent current leakage. The bit 5 of pbdier register can be

set to “0” to disable digital input; wake-up from power-down by toggling this pin is also

disabled.

The functions of this pin can be:

(1) Bit 4 of port B. It can be configured as digital input, two-state output with pull-high

resistor independently by software.

IO

PB4 /

AD4 /

(2) Channel 4 of ADC analog input.

ST /

(3) PWM output from Timer2.

CMOS /

Analog

TM2PWM

When this pin is configured as analog input, please use bit 4 of register pbdier to

disable the digital input to prevent current leakage. The bit 4 of pbdier register can be

set to “0” to disable digital input; wake-up from power-down by toggling this pin is also

disabled.

The functions of this pin can be:

(1) Bit 3 of port B. It can be configured as digital input, two-state output with pull-high

/ pull-low resistor independently by software.

IO

PB3 /

AD3

ST /

(2) Channel 3 of ADC analog input.

CMOS /

Analog

When this pin is configured as analog input, please use bit 3 of register pbdier to

disable the digital input to prevent current leakage. The bit 3 of pbdier register can

be set to “0” to disable digital input; wake-up from power-down by toggling this pin is

also disabled.

The functions of this pin can be:

(1) Bit 2 of port B. It can be configured as digital input, two-state output with pull-high

resistor independently by software.

IO

PB2 /

AD2 /

(2) Channel 2 of ADC analog input.

ST /

(3) PWM output from Timer2.

CMOS /

Analog

TM2PWM

When this pin is configured as analog input, please use bit 2 of register pbdier to

disable the digital input to prevent current leakage. The bit 2 of pbdier register can

be set to “0” to disable digital input; wake-up from power-down by toggling this pin is

also disabled.

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8bit OTP MCU with 8-bit ADC

Pin Type &

Buffer Type

Pin Name

Description

The functions of this pin can be:

(1) Bit 1 of port B. It can be configured as digital input, two-state output with pull-high

resistor independently by software.

IO

PB1 /

AD1 /

Vref

(2) Channel 1 of ADC analog input.

ST /

(3) External reference high voltage for ADC.

CMOS /

Analog

When this pin is configured as analog input, please use bit 1 of register pbdier to

disable the digital input to prevent current leakage. The bit 1 of pbdier register can

be set to “0” to disable digital input; wake-up from power-down by toggling this pin is

also disabled.

The functions of this pin can be:

(1) Bit 0 of port B. It can be configured as input or open-drain output pin.

(2) PWM output from Timer2.

PB0 /

TM2PWM /

INT1

IO (OD)

ST /

(3) External interrupt line 1. It can be used as an external interrupt line 1. Both rising

edge and falling edge are accepted to request interrupt service and configurable

by register setting.

CMOS

Please note that PB0 does NOT have pull-high resistor.

If bit 0 of pbdier register is set to “0” to disable digital input, wake-up from

power-down by toggling this pin is also disabled.

VDD: Digital positive power

VDD /

AVDD

VDD /

AVDD

AVDD: Analog positive power

VDD is the IC power supply while AVDD is the ADC power supply. AVDD and VDD

are double bonding internally and they have the same external pin.

GND: Digital negative power

GND /

AGND

GND /

AGND

AGND: Analog negative power

GND is the IC ground pin while AGND is the ADC ground pin. AGND and GND are

double bonding internally and they have the same external pin.

Notes: IO: Input/Output; ST: Schmitt Trigger input; OD: Open Drain; Analog: Analog input pin;

CMOS: CMOS voltage level

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8bit OTP MCU with 8-bit ADC

4. Device Characteristics

4.1. AC/DC Device Characteristics

All data are acquired under the conditions of V_DD=5.0V, f_SYS=2MHz unless noted.

Symbol

V_DD

Description

Operating Voltage

Min

1.8*

-5

Typ.

Max

5.5

5

Unit

V

Conditions (Ta=25^oC)

5.0

* Subject to LVR tolerance

LVR%

Low Voltage Reset Tolerance

%

System clock (CLK)* =

IHRC/2

0

8M

4M

2M

V_DD≧3.0V

V_DD≧2.2V

V_DD≧1.8V

f_SYS

IHRC/4

Hz

IHRC/8

ILRC

50K

0.7

35

V_DD= 5.0V

mA f_SYS=IHRC/16=1MIPS@5.0V

uA f_SYS=ILRC=50KHz@3.3V

uA f_SYS= 0Hz, V_DD=5.0V

Operating Current

I_OP

I_PD

I_PS

Power Down Current

(by stopsys command)

Power Save Current

(by stopexe command)

1

0.6

uA f_SYS= 0Hz, V_DD=3.3V

V_DD=5.0V; f_SYS= ILRC

3

uA

V

Only ILRC module is enabled.

V_IL

V_IH

Input low voltage for IO lines

Input high voltage for IO lines

0

0.1 V_DD

0.8 V_DD

0.7 V_DD

V_DD

PA5

V

other IO

IO lines sink current

PB0

135

16

PB4, PB5 (normal)

PB4, PB5 (strong)

others

I_OL

mA V_DD=5.0V, V_OL=0.5V

38

16

IO lines drive current

PA5, PB0

0

14

20

135

6

PB4, PB5 (normal)

PB4, PB5 (strong)

PB7

I_OH

mA V_DD=5.0V, V_OH=4.5V

others

V_IN

Input voltage

-0.3

V_DD+0.3

1

V

mA

V_DD+0.3≧V_IN≧ -0.3

I_{INJ (PIN)}

Injected current on pin

PA5

120

75

V_DD=5.0V

R_PH

PB7

KΩ V_DD=5.0V

V_DD=5.0V

Others (except PB0)

82

61

V_DD=5.0V

R_PL

Pull-Low Resistance

100

180

KΩ

V_DD=3.3V

V_DD=2.2V

V_DD=1.8V ~ 5.5V

-20^oC <Ta<70^oC*

V_BG

Bandgap Reference Voltage

1.145*

1.20*

1.255*

V

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PMS171B

8bit OTP MCU with 8-bit ADC

Symbol

Description

Min

Typ

Max

Unit

Conditions (Ta=25^oC)

* Subject to LVR tolerance

25^oC, V_DD=2.0V~5.5V

V_DD=2.0V~5.5V,

V_POR

Power On Reset Voltage

1.8

V

15.76*

15.20*

16.24*

16.80*

Frequency of IHRC after

0^oC <Ta<70^oC*

f_IHRC

16*

MHz

calibration *

V_DD=1.8V~5.5V,

0^oC <Ta<70^oC*

13.60*

18.40*

t_INT

Interrupt pulse width

ADC Input Voltage

ADC resolution

30

0

-

ns

V

V_DD= 5.0V

V_ADC

ADrs

V_DD

-

8

bit

mA

0.9

0.8

2

@5V

ADcs

ADclk

ADC current consumption

-

@3V

ADC clock period

us

1.8V ~ 5.5V

ADC conversion time

t_ADCONV

(T_ADCLKis the period of the

selected AD conversion clock)

ADC Differential NonLinearity

ADC Integral NonLinearity

ADC offset*

-

15

-

T_ADCLK

8-bit resolution

AD DNL

AD INL

ADos

±2*

±4*

5*

LSB

mV

V

@ V_DD=3V

V_DR

RAM data retention voltage*

1.5

in stop mode

8k

misc[1:0]=00 (default)

misc[1:0]=01

16k

t_WDT

Watchdog timeout period

T_ILRC

64k

misc[1:0]=10

misc[1:0]=11

256k

Wake-up time period for fast

wake-up

45

Where T_ILRCis the time

period of ILRC

t_WUP

T_ILRC

Wake-up time period for

normal wake-up

3000

System boot-up period from

power-on for Normal boot-up

System boot-up period from

power-on for Fast boot-up

55

ms

us

V_DD=5V

t_SBP

820

V_DD=5V

t_RST

External reset pulse width

120

-

us

@ V_DD=5V

CPos

Comparator offset*

Comparator input common

mode*

±10

±20

mV

V_DD-1.5

CPcm

CPspt

CPmc

0

V

Comparator response time**

100

2.5

500

7.5

ns

us

Both Rising and Falling

Stable time to change

comparator mode

Comparator

consumption

current

CPcs

20

uA

V_DD= 3.3V

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8bit OTP MCU with 8-bit ADC

*These parameters are for design reference, not tested for each chip.

4.2. Absolute Maximum Ratings



Supply Voltage …………………………….....

1.8V ~ 5.5V

Input Voltage ………………………………….. -0.3V ~ V_DD+ 0.3V

Operating Temperature ............................... -20^oC ~ 70^oC

Junction Temperature ………………………… 150°C

Storage Temperature ………………………… -50°C ~ 125°C

4.3. Typical ILRC frequency vs. VDD

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8bit OTP MCU with 8-bit ADC

4.4. Typical IHRC frequency deviation vs. VDD (calibrated to 16MHz)

4.5. Typical ILRC Frequency vs. Temperature

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8bit OTP MCU with 8-bit ADC

4.6. Typical IHRC Frequency vs. Temperature (calibrated to 16MHz)

4.7. Typical operating current vs. VDD @ system clock = ILRC/n

Conditions:

ON: Bandgap, LVR, ILRC; OFF: IHRC, EOSC, T16, TM2, TM3, ADC modules;

IO: PA0:0.5Hz output toggle and no loading, others: input and no floating

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8bit OTP MCU with 8-bit ADC

4.8. Typical operating current vs. VDD @ system clock = IHRC/n

Conditions:

ON: Bandgap, LVR, IHRC; OFF: ILRC, EOSC, LVR, T16, TM2, TM3, ADC modules;

IO: PA0:0.5Hz output toggle and no loading, others: input and no floating

4.9. Typical operating current vs. VDD @ system clock = 4MHz EOSC / n

Conditions:

ON: Bandgap, LVR, EOSC, MISC.6 = 1; OFF: IHRC, ILRC, T16, TM2, TM3, ADC modules;

IO: PA0:0.5Hz output toggle and no loading, others: input and no floating

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8bit OTP MCU with 8-bit ADC

4.10.Typical operating current vs. VDD @ system clock = 32KHz EOSC / n

Conditions:

ON: Bandgap, LVR, EOSC, MISC.6 = 1; OFF: IHRC, ILRC, T16, TM2, TM3, ADC modules;

IO: PA0:0.5Hz output toggle and no loading, others: input and no floating

4.11.Typical operating current vs. VDD @ system clock = 1MHz EOSC / n

Conditions:

ON: Bandgap, LVR, EOSC, MISC.6 = 1; OFF: IHRC, ILRC, T16, TM2, TM3, ADC modules;

IO: PA0:0.5Hz output toggle and no loading, others: input and no floating

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8bit OTP MCU with 8-bit ADC

4.12.Typical IO driving current (I_OH) and sink current (I_OL)

(VOH=0.9*VDD, VOL=0.1*VDD)

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8bit OTP MCU with 8-bit ADC

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8bit OTP MCU with 8-bit ADC

4.13. Typical IO input high/low threshold voltage (V_IH/V_IL)

4.14. Typical resistance of IO pull high device

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8bit OTP MCU with 8-bit ADC

4.15. Typical resistance of IO pull Low device

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8bit OTP MCU with 8-bit ADC

4.16. Typical power down current (I_PD) and power save current (I_PS)

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8bit OTP MCU with 8-bit ADC

5. Functional Description

5.1. Program Memory - OTP

The OTP (One Time Programmable) program memory is used to store the program instructions to be executed.

The OTP program memory may contains the data, tables and interrupt entry. After reset, the initial address

0x000 is reserved for system using, so the program will start from 0x001 which is GOTO FPPA0 instruction

usually. The interrupt entry is 0x10 if used, the last 24 addresses are reserved for system using, like checksum,

serial number, etc. The OTP program memory for PMS171B is 1.5Kx14 bit that is partitioned as Table 1. The

OTP memory from address “0x5E8 to 0x5FF” is for system using, address space from “0x002 to 0x00F” and

from “0x011 to 0x5E7” are user program spaces.

Address

0x000

0x001

0x002

•

Function

System Using

GOTO FPPA0 instruction

User program

•

0x00F

0x010

0x011

•

User program

Interrupt entry address

User program

•

0x5E7

0x5E8

•

User program

System Using

•

0x5FF

System Using

Table 1: Program Memory Organization

5.2. Boot Procedure

POR (Power-On-Reset) is used to reset PMS171B when power up. The boot up time can be optional fast or

normal. Customer must ensure the stability of supply voltage after power up no matter which option is chosen,

the power up sequence is shown in the Fig. 1 and t_SBPis the boot up time.

Please noted, during Power-On-Reset, the V_DDmust go higher than V_PORto boot-up the MCU.

Fig. 1: Power-Up Sequence

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PMS171B

8bit OTP MCU with 8-bit ADC

5.2.1. Timing charts for reset conditions

LVR level

SBP

VDD

LVR

t

Program

Execution

Boot up from LVR detection

VDD

t

SBP

WD

Time Out

Program

Execution

Boot up from Watch Dog Time Out

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8bit OTP MCU with 8-bit ADC

5.3. Data Memory - SRAM

The access of data memory can be byte or bit operation. Besides data storage, the SRAM data memory is also

served as data pointer of indirect access method and the stack memory.

The stack memory is defined in the data memory. The stack pointer is defined in the stack pointer register; the

depth of stack memory of each processing unit is defined by the user. The arrangement of stack memory fully

flexible and can be dynamically adjusted by the user.

For indirect memory access mechanism, the data memory is used as the data pointer to address the data byte.

All the data memory could be the data pointer; it’s quite flexible and useful to do the indirect memory access.

Since the data width is 8-bit, all the 96 bytes data memory of PMS171B can be accessed by indirect access

mechanism.

5.4. Oscillator and clock

There are three oscillator circuits provided by PMS171B: external crystal oscillator (EOSC), internal high RC

oscillator (IHRC) and internal low RC oscillator (ILRC), and these three oscillators are enabled or disabled by

registers eoscr.7, clkmd.4 and clkmd.2 independently. User can choose one of these three oscillators as

system clock source and use clkmd register to target the desired frequency as system clock to meet different

applications.

Oscillator Module

EOSC

Enable/Disable

eoscr.7

IHRC

clkmd.4

ILRC

clkmd.2

Table 2: Three oscillation circuits

5.4.1. Internal High RC oscillator and Internal Low RC oscillator

After boot-up, the IHRC and ILRC oscillators are enabled. The frequency of IHRC can be calibrated to

eliminate process variation by ihrcr register; normally it is calibrated to 16MHz. Please refer to the

measurement chart for IHRC frequency verse V_DDand IHRC frequency verse temperature. The frequency of

ILRC will vary by process, supply voltage and temperature, please refer to DC specification and do not use for

accurate timing application.

5.4.2. Chip calibration

The IHRC frequency and bandgap reference voltage may be different chip by chip due to manufacturing

variation, PMS171B provide the IHRC frequency calibration to eliminate this variation, and this function can be

selected when compiling user’s program and the command will be inserted into user’s program automatically.

The calibration command is shown as below:

.ADJUST_IC SYSCLK=IHRC/(p1), IHRC=(p2)MHz, V_DD=(p3)V;

Where, p1=2, 4, 8, 16, 32; In order to provide different system clock.

p2=14 ~ 18; In order to calibrate the chip to different frequency, 16MHz is the usually one.

p3=2.5 ~ 5.5; In order to calibrate the chip under different supply voltage.

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8bit OTP MCU with 8-bit ADC

5.4.3. IHRC Frequency Calibration and System Clock

During compiling the user program, the options for IHRC calibration and system clock are shown as Table 3:

SYSCLK

○ Set IHRC / 2

○ Set IHRC / 4

○ Set IHRC / 8

○ Set IHRC / 16

○ Set IHRC / 32

○ Set ILRC

CLKMD

IHRCR

Calibrated

No Change

Description

= 34h (IHRC / 2)

= 14h (IHRC / 4)

= 3Ch (IHRC / 8)

= 1Ch (IHRC / 16)

= 7Ch (IHRC / 32)

= E4h (ILRC / 1)

No change

IHRC calibrated to 16MHz, CLK=8MHz (IHRC/2)

IHRC calibrated to 16MHz, CLK=4MHz (IHRC/4)

IHRC calibrated to 16MHz, CLK=2MHz (IHRC/8)

IHRC calibrated to 16MHz, CLK=1MHz (IHRC/16)

IHRC calibrated to 16MHz, CLK=0.5MHz (IHRC/32)

IHRC calibrated to 16MHz, CLK=ILRC

○ Disable

IHRC not calibrated, CLK not changed

Table 3: Options for IHRC Frequency Calibration

Usually, .ADJUST_IC will be the first command after boot up, in order to set the target operating frequency

whenever starting the system. The program code for IHRC frequency calibration is executed only one time that

occurs in writing the codes into OTP memory; after then, it will not be executed again. If the different option for

IHRC calibration is chosen, the system status is also different after boot. The following shows the status of

PMS171B for different option:

(1) .ADJUST_IC

SYSCLK=IHRC/2, IHRC=16MHz, V_DD=5V

After boot up, CLKMD = 0x34：



IHRC frequency is calibrated to 16MHz@V_DD=5V and IHRC module is enabled

System CLK = IHRC/2 = 8MHz

Watchdog timer is disabled, ILRC is enabled, PA5 is in input mode

(2) .ADJUST_IC

SYSCLK=IHRC/4, IHRC=16MHz, V_DD=3.3V

After boot up, CLKMD = 0x14：



IHRC frequency is calibrated to 16MHz@V_DD=3.3V and IHRC module is enabled

System CLK = IHRC/4 = 4MHz

Watchdog timer is disabled, ILRC is enabled, PA5 is in input mode

(3) .ADJUST_IC

SYSCLK=IHRC/8, IHRC=16MHz, V_DD=2.5V

After boot up, CLKMD = 0x3C：



IHRC frequency is calibrated to 16MHz@V_DD=2.5V and IHRC module is enabled

System CLK = IHRC/8 = 2MHz

Watchdog timer is disabled, ILRC is enabled, PA5 is in input mode

(4) .ADJUST_IC

SYSCLK=IHRC/16, IHRC=16MHz, V_DD=2.5V

After boot up, CLKMD = 0x1C：



IHRC frequency is calibrated to 16MHz@V_DD=2.5V and IHRC module is enabled

System CLK = IHRC/16 = 1MHz

Watchdog timer is disabled, ILRC is enabled, PA5 is in input mode

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8bit OTP MCU with 8-bit ADC

(5) .ADJUST_IC

SYSCLK=IHRC/32, IHRC=16MHz, V_DD=5V

After boot up, CLKMD = 0x7C：



IHRC frequency is calibrated to 16MHz@V_DD=5V and IHRC module is enabled

System CLK = IHRC/32 = 500KHz



Watchdog timer is disabled, ILRC is enabled, PA5 is in input mode

SYSCLK=ILRC, IHRC=16MHz, V_DD=5V

(6) .ADJUST_IC

After boot up, CLKMD = 0XE4：



IHRC frequency is calibrated to 16MHz@V_DD=5V and IHRC module is disabled



System CLK = ILRC

Watchdog timer is disabled, ILRC is enabled, PA5 is input mode

DISABLE

(7) .ADJUST_IC

After boot up, CLKMD is not changed (Do nothing)：



IHRC is not calibrated and IHRC module is disabled

System CLK = ILRC or IHRC/64

Watchdog timer is enabled, ILRC is enabled, PA5 is in input mode

5.4.4. External Crystal Oscillator

If crystal oscillator is used, a crystal or resonator is required between X1 and X2. Fig. 2 shows the hardware

connection under this application; the range of operating frequency of crystal oscillator can be from 32 KHz to

4MHz, depending on the crystal placed on; higher frequency oscillator than 4MHz is NOT supported.

(Select driving current for oscillator)

eoscr[6:5]

(Enable crystal oscillator)

eoscr.7

C1

PA7/X1

System clock = EOSC

PA6/X2

C2

The values of C1 and C2 should depend on

the specification of crystal.

Fig. 2: Connection of crystal oscillator

Besides crystal, external capacitor and options of PMS171B should be fine tuned in eoscr (0x0b) register to

have good sinusoidal waveform. The eoscr.7 is used to enable crystal oscillator module, eoscr.6 and eoscr.5

are used to set the different driving current to meet the requirement of different frequency of crystal oscillator:



eoscr.[6:5]=01 : Low driving capability, for lower frequency, ex: 32KHz crystal oscillator

eoscr.[6:5]=10 : Middle driving capability, for middle frequency, ex: 1MHz crystal oscillator

eoscr.[6:5]=11 : High driving capability, for higher frequency, ex: 4MHz crystal oscillator

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8bit OTP MCU with 8-bit ADC

Table 4 shows the recommended values of C1 and C2 for different crystal oscillator; the measured start-up

time under its corresponding conditions is also shown. Since the crystal or resonator had its own characteristic,

the capacitors and start-up time may be slightly different for different type of crystal or resonator, please refer to

its specification for proper values of C1 and C2.

Frequency

4MHz

C1

C2

Measured Start-up time

Conditions

4.7pF

10pF

22pF

4.7pF

10pF

22pF

6ms

11ms

450ms

(eoscr[6:5]=11, misc.6=0)

(eoscr[6:5]=10, misc.6=0)

(eoscr[6:5]=01, misc.6=0)

1MHz

32KHz

Table 4: Recommend values of C1 and C2 for crystal and resonator oscillators

When using the crystal oscillator, user must pay attention to the stable time of oscillator after enabling it, the

stable time of oscillator will depend on frequency, crystal type, external capacitor and supply voltage. Before

switching the system to the crystal oscillator, user must make sure the oscillator is stable; the reference

program is shown as below:

void

{

FPPA0 (void)

. ADJUST_IC SYSCLK=IHRC/16, IHRC=16MHz, V_DD=5V

$

EOSCR

Enable, 4MHz;

// EOSCR = 0b110_00000;

T16M EOSC, /1, BIT13;

// T16 receive 2^14=16384 clocks of crystal EOSC

// Intrq.T16 =>1, crystal EOSC Is stable

WORD

count =

0;

stt16 count;

Intrq.T16

=

0;

do

{

nop; }while(!Intrq.T16);

// count fm 0x0000 to 0x2000, then set INTRQ.T16

// switch system clock to EOSC;

// close IHRC

clkmd=

clkmd.4=0;

...

0xB4;

Please notice that the crystal oscillator should be fully turned off before entering the power-down mode, in

order to avoid unexpected wakeup event.

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8bit OTP MCU with 8-bit ADC

5.4.5. System Clock and LVR level

The clock source of system clock comes from EOSC, IHRC and ILRC, the hardware diagram of system clock

in the PMS171B is shown as Fig. 3.

clkmd[7:5]

÷2, ÷4,

÷8, ÷16, ÷32, ÷64

IHRC

clock

System

clock

M

EOSC

clock

÷1, ÷2, ÷4, ÷8

CLK

U

X

ILRC

÷1 (default), ÷4, ÷16

clock

Fig. 3: Options of System Clock

User can choose different operating system clock depends on its requirement; the selected operating system

clock should be combined with supply voltage and LVR level to make system stable. The LVR level will be

selected during compilation, and the lowest LVR levels can be chosen for different operating frequencies.

Please refer to Section 4.1.

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8bit OTP MCU with 8-bit ADC

5.4.6. System Clock Switching

After IHRC calibration, user may want to switch system clock to a new frequency or may switch system clock at

any time to optimize the system performance and power consumption. Basically, the system clock of PMS171B

can be switched among IHRC, ILRC and EOSC by setting the clkmd register at any time; system clock will be

the new one after writing to clkmd register immediately. Please notice that the original clock module can NOT

be turned off at the same time as writing command to clkmd register. The examples are shown as below and

more information about clock switching, please refer to the “Help” -> “Application Note” -> “IC Introduction” ->

“Register Introduction” -> CLKMD”.

Case 1: Switching system clock from ILRC to IHRC/2

…

//

system clock is ILRC

CLKMD.4

CLKMD

// CLKMD.2

…

=

1;

turn on IHRC first to improve anti-interference ability

switch to IHRC/2, ILRC CAN NOT be disabled here

if need, ILRC CAN be disabled at this time

=

0x34；

0；

=

Case 2: Switching system clock from ILRC to EOSC

…

//

system clock is ILRC

CLKMD

CLKMD.2

…

=

0xA6；

0；

switch to IHRC, ILRC CAN NOT be disabled here

ILRC CAN be disabled at this time

Case 3: Switching system clock from IHRC/2 to ILRC

…

//

system clock is IHRC/2

CLKMD

CLKMD.4

…

=

0xF4；

0；

switch to ILRC, IHRC CAN NOT be disabled here

IHRC CAN be disabled at this time

Case 4: Switching system clock from IHRC/2 to EOSC

…

//

system clock is IHRC/2

CLKMD

CLKMD.4

…

=

0XB0；

0；

switch to EOSC, IHRC CAN NOT be disabled here

IHRC CAN be disabled at this time

Case 5: Switching system clock from IHRC/2 to IHRC/4

…

//

system clock is IHRC/2, ILRC is enabled here

switch to IHRC/4

CLKMD

…

=

0X14；

Case 6: System may hang if it is to switch clock and turn off original oscillator at the same time

…

//

system clock is ILRC

CLKMD

=

0x30；

//

CAN NOT switch clock from ILRC to IHRC/2 and

turn off ILRC oscillator at the same time

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8bit OTP MCU with 8-bit ADC

5.5. Comparator

One hardware comparator is built inside the PMS171B; Fig. 4 shows its hardware diagram. It can compare

signals between two pins or with either internal reference voltage V_{internal R}or internal bandgap reference voltage.

The two signals to be compared, one is the plus input and the other one is the minus input. For the minus input of

comparator can be PA3, PA4, Internal bandgap 1.20 volt, PB6, PB7 or V_{internal R}selected by bit [3:1] of gpcc

register, and the plus input of comparator can be PA4 or V_{internal R}selected by bit 0 of gpcc register.

The comparator result can be selected through gpcs.7 to forcibly output to PA0 whatever it is input or output

state. It can be a direct output , or sampled by Timer2 clock (TM2_CLK) which comes from Timer2 module

through gpcc.5. The output polarity can be also inverted by setting gpcc.4register, the comparator output can be

used to request interrupt service or read through gpcc.6.

16 stages

VDD

8R

gpcs.5=1

gpcs.4=0

gpcs.4=1

R

gpcs.5=0

MUX

gpcs[3:0]

V_{internal R}

gpcc[3:1]

PA3/CIN0-

PA4/CIN1-

Bandgap

000

001 M

gpcc.4

To request interrupt

gpcc.6

010 U

011 X

100

X

O

R

-

PB6/CIN4-

PB7/CIN5-

M

U

X

101

+

D

F

To

PA0

0

Timer 2

clock

MUX

1

PA4/CIN+

gpcc.0

TM2_CLK

gpcc.5

gpcs.7

Fig. 4: Hardware diagram of comparator

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8bit OTP MCU with 8-bit ADC

5.5.1 Internal reference voltage (V_{internal R}

)

The internal reference voltage V_{internal R}is built by series resistance to provide different level of reference

voltage, bit 4 and bit 5 of gpcs register are used to select the maximum and minimum values of V_{internal R}

and bit [3:0] of gpcs register are used to select one of the voltage level which is deivided-by-16 from the

defined maximum level to minimum level. Fig. 5 to Fig. 8 shows four conditions to have different reference

voltage V_{internal R}. By setting the gpcs register, the internal reference voltage V_{internal R}can be ranged from

(1/32)*V_DDto (3/4)*V_DD.

Case 1 : gpcs.5=0 & gpcs.4=0

16 stages

VDD

8R

gpcs.4=0

gpcs.4=1

gpcs.5=1

R

gpcs.5=0

MUX

gpcs[3:0]

V _{internal R}= (3/4) VDD ~ (1/4) VDD + (1/32) VDD

@ gpcs[3:0] = 1111 ~ gpcs[3:0] = 0000

1

4

(n+1)

32

V _{internal R}

=

*

VDD +

*

VDD, n = gpcs[3:0] in decimal

Fig. 5: V_{internal R}hardware connection if gpcs.5=0 and gpcs.4=0

Case 2 : gpcs.5=0 & gpcs.4= 1

16 stages

VDD

8R

gpcs.4=0

gpcs.4=1

gpcs.5=1

R

gpcs.5=0

MUX

gpcs[3:0]

V

_{internal R}= (2/3) VDD ~ (1/24) VDD

@ gpcs[3:0] = 1111 ~ gpcs[3:0] = 0000

(n+1)

V _{internal R}

=

*

VDD, n = gpcs[3:0] in decimal

24

Fig. 6: V_{internal R}hardware connection if gpcs.5=0 and gpcs.4=1

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Case 3 : gpcs.5=1 & gpcs.4= 0

16 stages

VDD

8R

gpcs.4=0

gpcs.4=1

gpcs.5=1

R

gpcs.5=0

MUX

gpcs[3:0]

V _{internal R}= (3/5) VDD ~ (1/5) VDD + (1/40) VDD

@ gpcs[3:0] = 1111 ~ gpcs[3:0] = 0000

1

5

(n+1)

40

V _{internal R}

=

*

VDD +

*

VDD, n = gpcs[3:0] in decimal

Fig. 7: V_{internal R}hardware connection if gpcs.5=1 and gpcs.4=0

Case 4 : gpcs.5=1 & gpcs.4=1

16 stages

VDD

8R

gpcs.4=0

gpcs.4=1

gpcs.5=1

R

gpcs.5=0

MUX

gpcs[3:0]

V _{internal R}= (1/2) VDD ~ (1/32) VDD

@ gpcs[3:0] = 1111 ~ gpcs[3:0] = 0000

(n+1)

V _{internal R}

=

*

VDD, n = gpcs[3:0] in decimal

32

Fig. 8: V_{internal R}hardware connection if gpcs.5=1 and gpcs.4=1

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5.5.2

Using the comparator

Case 1:

Choosing PA3 as minus input and V_{internal R}with (18/32)*V_DDvoltage level as plus input. V_{internal R}is

configured as the above Figure “gpcs[5:4] = 2b’00” and gpcs [3:0] = 4b’1001 (n=9) to have V_{internal R}

(1/4)*V_DD+ [(9+1)/32]*V_DD= [(9+9)/32]*V_DD= (18/32)*V_DD.

=

gpcs = 0b0_0_00_1001;

gpcc = 0b1_0_0_0_000_0;

padier = 0bxxxx_0_xxx;

// V_{internal R}= V_DD*(18/32)

// enable comp, - input: PA3, + input: V_{internal R}

// disable PA3 digital input to prevent leakage current

or

$ GPCS

V_DD*18/32;

$ GPCC Enable, N_PA3, P_R;

PADIER = 0bxxxx_0_xxx;

// - input: N_xx，+ input: P_R(V_{internal R})

Case 2:

Choosing V_{internal R}as minus input with (22/40)*V_DDvoltage level and PA4 as plus input, the comparator

result will be inversed and then output to PA0. V_{internal R}is configured as the above Figure “gpcs[5:4] =

2b’10” and gpcs [3:0] = 4b’1101 (n=13) to have V_{internal R}= (1/5)*V_DD+ [(13+1)/40]*V_DD= [(13+9)/40]*V_DD

(22/40)*V_DD.

=

gpcs = 0b1_0_10_1101;

gpcc = 0b1_0_0_1_011_1;

padier = 0bxxx_0_xxxx;

// output to PA0, V_{internal R}= V_DD*(22/40)

// Inverse output, - input: V_{internal R}, + input: PA4

// disable PA4 digital input to prevent leakage current

or

$ GPCS Output, V_DD*22/40;

$ GPCC Enable, Inverse, N_R, P_PA4;

PADIER = 0bxxx_0_xxxx;

// - input: N_R(V_{internal R})，+ input: P_xx

Note: When selecting output to PA0 output, GPCS will affect the PA3 output function in ICE. Though the

IC is fine, be careful to avoid this error during emulation.

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5.5.3 Using the comparator and bandgap 1.20V

The internal bandgap module can provide 1.20 volt, it can measure the external supply voltage level. The

bandgap 1.20 volt is selected as minus input of comparator and V_{internal R}is selected as plus input, the

supply voltage of V_{internal R}is VDD, the V_DDvoltage level can be detected by adjusting the voltage level of

V_{internal R}to compare with bandgap. If N (gpcs[3:0] in decimal) is the number to let V_{internal R}closest to

bandgap 1.20 volt, the supply voltage VDD can be calculated by using the following equations:

For using Case 1:

V_DD= [ 32 / (N+9) ] * 1.20 volt ;

For using Case 2: V_DD= [ 24 / (N+1) ] * 1.20 volt ;

For using Case 3:

For using Case 4:

V

_DD= [ 40 / (N+9) ] * 1.20 volt ;

_DD= [ 32 / (N+1) ] * 1.20 volt ;

V

Case 1:

$ GPCS V_DD*12/40;

// 4.0V * 12/40 = 1.2V

$ GPCC Enable, BANDGAP, P_R;

// - input: BANDGAP, + input: P_R(V_{internal R})

….

if (GPC_Out)

// or GPCC.6

{

// when V_DD﹥4V

}

else

{

// when V_DD﹤4V

}

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5.6 16-bit Timer (Timer16)

A 16-bit hardware timer (Timer16) is implemented in the PMS171B, the clock sources of Timer16 may come

from system clock (CLK), clock of external crystal oscillator (EOSC), internal high RC oscillator (IHRC),

internal low RC oscillator (ILRC), PA4 and PA0, a multiplex is used to select clock output for the clock source.

Before sending clock to the counter16, a pre-scaling logic with divided-by-1, 4, 16, and 64 is used for wide

range counting.

The 16-bit counter performs up-counting operation only, the counter initial values can be stored from memory

by stt16 instruction and the counting values can be loaded to memory by ldt16 instruction. A selector is used to

select the interrupt condition of Timer16, whenever overflow occurs, the Timer16 interrupt can be triggered.

The hardware diagram of Timer16 is shown as Fig. 9. The interrupt source of Timer16 comes from one of bit 8

to 15 of 16-bit counter, and the interrupt type can be rising edge trigger or falling edge trigger which is specified

in the bit 4 of integs register (IO address 0x0C).

PA4

Fig. 9: Hardware diagram of Timer16

When using the Timer16, the syntax for Timer16 has been defined in the .INC file. There are three parameters

to define the Timer16; 1^stparameter is used to define the clock source of Timer16, 2^ndparameter is used to

define the pre-scalar and the last one is to define the interrupt source. The detail description is shown as

below:

T16M IO_RW

0x06

$ 7~5:STOP, SYSCLK, X, PA4_F, IHRC, EOSC, ILRC, PA0_F

$ 4~3:/1, /4, /16, /64

// 1^stpar.

// 2^ndpar.

// 3^rdpar.

$ 2~0:BIT8, BIT9, BIT10, BIT11, BIT12, BIT13, BIT14, BIT15

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User can define the parameters of T16M based on system requirement, some examples are shown below and

more examples please refer to “Help  Application Note  IC Introduction  Register Introduction  T16M” in

IDE utility.

$ T16M SYSCLK, /64, BIT15;

// choose (SYSCLK/64) as Timer16 clock source, every 2^16 clock to set INTRQ.2=1

// if using System Clock = IHRC / 2 = 8 MHz

// SYSCLK/64 = 8 MHz/64 = 125KHz, about every 512 mS to generate INTRQ.2=1

$ T16M EOSC, /1, BIT13;

// choose (EOSC/1) as Timer16 clock source, every 2^14 clocks to generate INTRQ.2=1

// if EOSC=32768 Hz, 32768 Hz/(2^14) = 2Hz, every 0.5S to generate INTRQ.2=1

$ T16M PA0_F, /1, BIT8;

// choose PA0 as Timer16 clock source, every 2^9 to generate INTRQ.2=1

// receiving every 512 times PA0 to generate INTRQ.2=1

$ T16M STOP;

// stop Timer16 counting

If Timer16 is operated at free running, the frequency of interrupt can be described as below:

F_{INTRQ_T16M}= F_{clock source}÷ P ÷ 2ⁿ⁺¹

Where, F is the frequency of selected clock source to Timer16;

P is the selection of t16m [4:3]; (1, 4, 16, 64)

N is the n^thbit selected to request interrupt service, for example: n=10 if bit 10 is selected.

5.7 8-bit Timer (Timer2/Timer3) with PWM generation

Two 8-bit hardware timers (Timer2 and Timer3) with PWM generation are implemented in the PMS171B. The

following descriptions thereinafter are for Timer2 only. It is because Timer3 have same structure with Timer2.

Please refer to Fig. 10 shown the hardware diagram of Timer2, the clock sources of Timer2 may come from

system clock, internal high RC oscillator (IHRC), internal low RC oscillator (ILRC), external crystal oscillator

(EOSC), PA0, PB0, PA4 and comparator result. Bit [7:4] of register tm2c is used to select the clock of Timer2. If

IHRC is selected for Timer2 clock source, the clock sent to Timer2 will keep running when using ICE in halt

state. The output of Timer2 can be sent to pin PB2(or PB0 by option code), PA3 or PB4, depending on bit [3:2]

of tm2c register. It will be a forcibly output whatever the PX.x is in input or output state. A clock pre-scaling

module is provided with divided-by- 1, 4, 16, and 64 options, controlled by bit [6:5] of tm2s register; one scaling

module with divided-by-1~31 is also provided and controlled by bit [4:0] of tm2s register. In conjunction of

pre-scaling function and scaling function, the frequency of Timer2 clock (TM2_CLK) can be wide range and

flexible.

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The Timer2 counter performs 8-bit up-counting operation only; the counter values can be set or read back by

tm2ct register. The 8-bit counter will be clear to zero automatically when its values reach for upper bound

register, the upper bound register is used to define the period of timer or duty of PWM. There are two operating

modes for Timer2: period mode and PWM mode; period mode is used to generate periodical output waveform

or interrupt event; PWM mode is used to generate PWM output waveform with optional 6-bit to 8-bit PWM

resolution, Fig. 11 shows the timing diagram of Timer2 for both period mode and PWM mode.

Fig. 10: Timer2 hardware diagram

The output of Timer3 can be sent to pin PB5, PB6 or PB7.

Time out and

Interrupt request

Counter

0xFF

bound

Counter

0xFF

Counter

0x3F

bound

Time

Event Trigger

Output-pin

Time

Mode 0 – Period Mode

Mode 1 – 8-bit PWM Mode

Mode 1 – 6-bit PWM Mode

Fig. 11: Timing diagram of Timer2 in period mode and PWM mode (tm2c.1=1)

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A Code Option GPC_PWM is for the applications which need the generated PWM waveform to be controlled by

the comparator result. If the Code Option GPC_PWM is selected, the PWM output stops while the comparator

output is 1 and then the PWM output turns on while the comparator output goes back to 0, as shown in Fig. 12.

PWM Output

Comparator

Output

Fig. 12: Comparator controls the output of PWM waveform

5.7.1 Using the Timer2 to generate periodical waveform

If periodical mode is selected, the duty cycle of output is always 50%; its frequency can be summarized as

below:

Frequency of Output = Y ÷ [2 × (K+1) × S1 × (S2+1) ]

Where,

Y = tm2c[7:4] : frequency of selected clock source

K = tm2b[7:0] : bound register in decimal

S1 = tm2s[6:5] : pre-scalar (S1= 1, 4, 16, 64)

S2 = tm2s[4:0] : scalar register in decimal (S2= 0 ~ 31)

Example 1:

tm2c = 0b0001_1000, Y=8MHz

tm2b = 0b0111_1111, K=127

tm2s = 0b0000_00000, S1=1, S2=0

 frequency of output = 8MHz ÷ [ 2 × (127＋1) × 1 × (0＋1) ] = 31.25KHz

Example 2:

Example 3:

tm2c = 0b0001_1000, Y=8MHz

tm2b = 0b0111_1111, K=127

tm2s[7:0] = 0b0111_11111, S1=64 , S2 = 31

 frequency = 8MHz ÷ ( 2 × (127＋1) × 64 × (31＋1) ) =15.25Hz

tm2c = 0b0001_1000, Y=8MHz

tm2b = 0b0000_1111, K=15

tm2s = 0b0000_00000, S1=1, S2=0

 frequency = 8MHz ÷ ( 2 × (15＋1) × 1 × (0＋1) ) = 250KHz

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Example 4:

tm2c = 0b0001_1000, Y=8MHz

tm2b = 0b0000_0001, K=1

tm2s = 0b0000_00000, S1=1, S2=0

 frequency = 8MHz ÷ ( 2 × (1＋1) × 1 × (0＋1) ) =2MHz

The sample program for using the Timer2 to generate periodical waveform from PA3 is shown as below:

Void FPPA0 (void)

{

. ADJUST_IC SYSCLK=IHRC/2, IHRC=16MHz, V_DD=5V

…

tm2ct = 0x00;

tm2b = 0x7f;

tm2s = 0b0_00_00001;

//

8-bit PWM, pre-scalar = 1, scalar = 2

system clock, output=PA3, period mode

tm2c = 0b0001_10_0_0;

while(1)

{

nop;

}

5.7.2 Using the Timer2 to generate 8-bit PWM waveform

If 8-bit PWM mode is selected, it should set tm2c[1]=1 and tm2s[7]=0, the frequency and duty cycle of

output waveform can be summarized as below:

Frequency of Output = Y ÷ [256 × S1 × (S2+1) ]

Duty of Output = [ ( K + 1 ) ÷ 256] × 100%

Where, Y = tm2c[7:4] : frequency of selected clock source

K = tm2b[7:0] : bound register in decimal

S1= tm2s[6:5] : pre-scalar (S1= 1, 4, 16, 64)

S2 = tm2s[4:0] : scalar register in decimal (S2= 0 ~ 31)

Example 1:

tm2c = 0b0001_1010, Y=8MHz

tm2b = 0b0111_1111, K=127

tm2s = 0b0000_00000, S1=1, S2=0

 frequency of output = 8MHz ÷ ( 256 × 1 × (0+1) ) = 31.25KHz

 duty of output = [(127+1) ÷ 256] × 100% = 50%

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Example 2:

Example 3:

tm2c = 0b0001_1010, Y=8MHz

tm2b = 0b0111_1111, K=127

tm2s = 0b0111_11111, S1=64, S2=31

 frequency of output = 8MHz ÷ ( 256 × 64 × (31+1) ) = 15.25Hz

 duty of output = [(127+1) ÷ 256] × 100% = 50%

tm2c = 0b0001_1010, Y=8MHz

tm2b = 0b1111_1111, K=255

tm2s = 0b0000_00000, S1=1, S2=0

 PWM output keep high

 duty of output = [(255+1) ÷ 256] × 100% = 100%

Example 4:

tm2c = 0b0001_1010, Y=8MHz

tm2b = 0b0000_1001, K = 9

tm2s = 0b0000_00000, S1=1, S2=0

 frequency of output = 8MHz ÷ ( 256 × 1 × (0+1) ) = 31.25KHz

 duty of output = [(9+1) ÷ 256] × 100% = 3.9%

The sample program for using the Timer2 to generate PWM waveform from PA3 is shown as below:

void

{

FPPA0 (void)

.ADJUST_IC

SYSCLK=IHRC/2, IHRC=16MHz, V_DD=5V

wdreset;

tm2ct = 0x00;

tm2b = 0x7f;

tm2s = 0b0_00_00001;

//

8-bit PWM, pre-scalar = 1, scalar = 2

system clock, output=PA3, PWM mode

tm2c = 0b0001_10_1_0;

while(1)

{

nop;

}

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5.7.3 Using the Timer2 to generate 6-bit / 7-bit PWM waveform

If 6-bit/7-bit PWM mode is selected, it should set tm2c[1]=1 and tm2s[7]=1, the frequency and duty cycle

of output waveform can be summarized as below:

//Code options: TMX Bit = 6 bit

Frequency of Output = Y ÷ [64 × S1 × (S2+1) ]

Duty of Output = [( K＋1 ) ÷ 64] × 100%

//Code options: TMX Bit = 7 bit

Frequency of Output = Y ÷ [128 × S1 × (S2+1) ]

Duty of Output = [( K＋1 ) ÷ 128] × 100%

Where, tm2c[7:4] = Y : frequency of selected clock source

tm2b[7:0] = K : bound register in decimal

tm2s[6:5] = S1 : pre-scalar (S1= 1, 4, 16, 64)

tm2s[4:0] = S2 : scalar register in decimal (S2= 0 ~ 31)

Example 1:

tm2c = 0b0001_1010, Y=8MHz

tm2b = 0b0001_1111, K=31

tm2s = 0b1000_00000, S1=1, S2=0

 frequency of output = 8MHz ÷ ( 64 × 1 × (0+1) ) = 125KHz

 duty = [(31+1) ÷ 64] × 100% = 50%

Example 2:

tm2c = 0b0001_1010, Y=8MHz

tm2b = 0b0001_1111, K=31

tm2s = 0b1111_11111, S1=64, S2=31

 frequency of output = 8MHz ÷ ( 64 × 64 × (31+1) ) = 61.03 Hz

 duty of output = [(31+1) ÷ 64] × 100% = 50%

Example 3:

tm2c = 0b0001_1010, Y=8MHz

tm2b = 0b0011_1111, K=63

tm2s = 0b1000_00000, S1=1, S2=0

 PWM output keep high

 duty of output = [(63+1) ÷ 64] × 100% = 100%

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5.7.4 Complementary PWM with Dead Zones

User can get complementary PWM with dead zones by employing TM2 and TM3. Here provide an

example in which duty cycle and dead time are adjustable.

//------- These two parameters need be defined when T^(PWM)= 256 us ----------

#define

PWM_pulse

dead_zone

70

30

// 70 us; Adjust it for a different duty cycle of TM2/TM3.

// 30 us; Adjust it for the best dead time.

//--------Parameters for switching duty cycle -----------------------------------

#define

PWM_Pulse_a

PWM_Pulse_b

t_delay

100 // 100 us; Adjust it for a different duty cycle of TM2/TM3

160 // 160 us; Adjust it for a different duty cycle of TM2/TM3

500 // 500 us; Switching time of duty cycle

void

{

FPPA0 (void)

// SYSCLK must quicker than Timer2’s clock. Here set SYSCLK=2MHz to capture Tm2ct = 0.

.ADJUST_IC SYSCLK=IHRC/8, IHRC=16MHz, VDD=3.3V, Init_ram;

//******Generate complementary PWM with dead zones in a fixed-duty cycle****************

//------Set the counter upper bound, duty cycle and TMXCT -----------

$ TM2S 8BIT,/4,/4

TM2B

// 16MHz /4 /4 /256 = 1MHz / 256 =

256 us

=

PWM_pulse - 1;

$ TM3S 8BIT,/4,/4

// 16MHz /4 /4 /256

TM3B

=

PWM_pulse + 2 * dead_zone - 1;

TM2CT

TM3CT

0;

//------Timer PWM output control -------------------

$ TM3C

.delay

IHRC, PB5, PWM, Inverse;

dead_zone*2 - 2;

// Inverse output

// "*2": SYSCLK = 2MHz

// "-2": executing “$ TM3C XXXX” needs two

// instructions

$ TM2C

IHRC, PB4, PWM;

//***Note: Do not change the sequence of the control part’s program*****

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//-------Following codes can be for reference when user needs switch duty cycle ----------

//------ Switching PWM_pulse -------------------

While (1)

{

While(tm2ct!=0)

{}

// Wait till tm2ct=0 to avoid noise

TM2B

TM3B

.delay

=

PWM_Pulse_a - 1;

PWM_Pulse_a + 2 * dead_zone - 1;

t_delay*2;

While(tm2ct!=0) {}

TM2B

TM3B

.delay

=

PWM_Pulse_b - 1;

PWM_Pulse_b + 2 * dead_zone - 1;

t_delay*2;

}

The following figures show the waveforms at different condition.

1. The PWM waveforms in a fixed-duty cycle:

Dead time

30us.

TM2

TM3

Fig. 13： Two complementary PWM waveforms with dead zones

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2. PWM waveforms when switching two duty cycles:

Dead time 30us

TM2

TM3

Fig. 14： Two complementary PWM waveforms with dead zones

Note: This example just illustrate a method for generating complementary PWM with dead zones and

switching duty cycle. If users try to switch duty cycle by adjusting PWM_pulse: such as when the present

PWM_pulse = 70, directly let PWM_pulse_a = 100 and PWM_pulse_b = 160. Then the new value must not

be re-assigned to tm2b register until tm2ct is 0.

This method can effectively deal with the problems such as first duty cycle inaccuracy and possible

dead zone time reduction or dead zone disappear caused by assigning new value to tm2b when tm2ct is not 0.

Please handle it carefully and consult FAE when necessary according to the practical application

specifications.

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5.8 WatchDog Timer

The watchdog timer (WDT) is a counter with clock coming from ILRC. WDT can be cleared by power-on-reset

or by command wdreset at any time. There are four different timeout periods of watchdog timer to be chosen

by setting the misc register, it is:

 8k ILRC clocks period if register misc[1:0]=00 (default)

 16k ILRC clocks period if register misc[1:0]=01

 64k ILRC clocks period if register misc[1:0]=10

 256k ILRC clocks period if register misc[1:0]=11

The frequency of ILRC may drift a lot due to the variation of manufacture, supply voltage and temperature; user

should reserve guard band for save operation. Besides, the watchdog period will also be shorter than expected

after Reset or Wakeup events. It is suggested to clear WDT by wdreset command after these events to ensure

enough clock periods before WDT timeout.

When WDT is timeout, PMS171B will be reset to restart the program execution. The relative timing diagram of

watchdog timer is shown as Fig. 15.

VDD

t

SBP

WD

Time Out

Program

Execution

Watch Dog Time Out Sequence

Fig. 15: Sequence of Watch Dog Time Out

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5.9 Interrupt

There are 7 interrupt lines for PMS171B:

 External interrupt PA0/PB5

 External interrupt PB0/PA4

 ADC interrupt

 Timer16 interrupt

 GPC interrupt

 Timer2 interrupt

 Timer3 interrupt

Every interrupt request line has its own corresponding interrupt control bit to enable or disable it; the hardware

diagram of interrupt function is shown as Fig. 16. All the interrupt request flags are set by hardware and cleared

by writing intrq register. When the request flags are set, it can be rising edge, falling edge or both, depending

on the setting of register integs. All the interrupt request lines are also controlled by engint instruction (enable

global interrupt) to enable interrupt operation and disgint instruction (disable global interrupt) to disable it.

The stack memory for interrupt is shared with data memory and its address is specified by stack register sp.

Since the program counter is 16 bits width, the bit 0 of stack register sp should be kept 0. Moreover, user can

use pushaf / popaf instructions to store or restore the values of ACC and flag register to / from stack memory.

Since the stack memory is shared with data memory, the stack position and level are arranged by the compiler

in Mini-C project. When defining the stack level in ASM project, users should arrange their locations carefully to

prevent address conflicts.

Fig. 16: Hardware diagram of interrupt controller

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Once the interrupt occurs, its operation will be:

 The program counter will be stored automatically to the stack memory specified by register sp.

 New sp will be updated to sp+2.

 Global interrupt will be disabled automatically.

 The next instruction will be fetched from address 0x010.

During the interrupt service routine, the interrupt source can be determined by reading the intrq register.

Note: Even if INTEN=0, INTRQ will be still triggered by the interrupt source.

After finishing the interrupt service routine and issuing the reti instruction to return back, its operation will be:

 The program counter will be restored automatically from the stack memory specified by register sp.

 New sp will be updated to sp-2.

 Global interrupt will be enabled automatically.

 The next instruction will be the original one before interrupt.

User must reserve enough stack memory for interrupt, two bytes stack memory for one level interrupt and four

bytes for two levels interrupt. And so on, two bytes stack memory is for pushaf. For interrupt operation, the

following sample program shows how to handle the interrupt, noticing that it needs four bytes stack memory to

handle one level interrupt and pushaf.

void

{

FPPA0 (void)

...

$

INTEN PA0;

// INTEN =1; interrupt request when PA0 level changed

// clear INTRQ

INTRQ

ENGINT

...

=

0;

// global interrupt enable

DISGINT

...

// global interrupt disable

}

void

{

Interrupt (void)

// interrupt service routine

PUSHAF

// store ALU and FLAG register

// If INTEN.PA0 will be opened and closed dynamically,

// user can judge whether INTEN.PA0 =1 or not.

// Example: If (INTEN.PA0 && INTRQ.PA0) {…}

// If INTEN.PA0 is always enable,

// user can omit the INTEN.PA0 judgement to speed up interrupt service routine.

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If (INTRQ.PA0)

{

// Here for PA0 interrupt service routine

INTRQ.PA0 = 0;

// Delete corresponding bit (take PA0 for example)

...

}

...

// X : INTRQ = 0;

// It is not recommended to use INTRQ = 0 to clear all at the end of the

// interrupt service routine.

// It may accidentally clear out the interrupts that have just occurred

// and are not yet processed.

POPAF

// restore ALU and FLAG register

}

5.10 Power-Save and Power-Down

There are three operational modes defined by hardware: ON mode, Power-Save mode and Power-Down

modes. ON mode is the state of normal operation with all functions ON, Power-Save mode (“stopexe”) is the

state to reduce operating current and CPU keeps ready to continue, Power-Down mode (“stopsys”) is used to

save power deeply. Therefore, Power-Save mode is used in the system which needs low operating power with

wake-up periodically and Power-Down mode is used in the system which needs power down deeply with

seldom wake-up.

5.10.1 Power-Save mode (“stopexe”)

Using “stopexe” instruction to enter the Power-Save mode, only system clock is disabled, remaining all

the oscillator modules active. For CPU, it stops executing; however, for Timer16, counter keep counting

if its clock source is not the system clock. The wake-up sources for “stopexe” can be IO-toggle or

Timer16 counts to set values when the clock source of Timer16 is IHRC or ILRC modules,or wakeup by

comparator when setting GPCC.7=1 and GPCS.6=1 to enable the comparator wakeup function at the

same time. Wake-up from input pins can be considered as a continuation of normal execution, the detail

information for Power-Save mode shows below:

 IHRC and EOSC oscillator modules: No change, keep active if it was enabled

 ILRC oscillator modules: must remain enabled, need to start with ILRC when be wakening up

 System clock: Disable, therefore, CPU stops execution

 OTP memory is turned off

 Timer counter: Stop counting if its clock source is system clock or the corresponding oscillator module

is disabled; otherwise, it keeps counting. (The Timer contains TM16, TM2, TM3.)

 Wake-up sources:

a. IO toggle wake-up: IO toggling in digital input mode (PxC bit is 1 and PxDIER bit is 1)

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b. Timer wake-up: If the clock source of Timer is not the SYSCLK, the system will be awakened

when the Timer counter reaches the set value.

c. Comparator wake-up: It need setting GPCC.7=1 and GPCS.6=1 to enable the comparator

wake-up function at the same time.

An example shows how to use Timer16 to wake-up from “stopexe”:

$ T16M

IHRC, /1, BIT8

// Timer16 setting

$ INTEGS BIT_R, xxx;

…

// BITx 0 to 1 will trigger (default)

WORD

STT16

count =

count;

0;

stopexe;

…

The initial counting value of Timer16 is zero and the system will be woken up after the Timer16 counts 256

IHRC clocks.

5.10.2 Power-Down mode (“stopsys”)

Power-Down mode is the state of deeply power-saving with turning off all the oscillator modules. By using

the “stopsys” instruction, this chip will be put on Power-Down mode directly. It is recommend to set

GPCC.7=0 to disable the comparator before the command “stopsys”. The following shows the internal

status of PMS171B detail when “stopsys” command is issued:

 All the oscillator modules are turned off

 OTP memory is turned off

 The contents of SRAM and registers remain unchanged

 Wake-up sources: IO toggle in digital mode (PxDIER bit is 1)

Wake-up from input pins can be considered as a continuation of normal execution. To minimize power

consumption, all the I/O pins should be carefully manipulated before entering power-down mode. The

reference sample program for power down is shown as below:

CLKMD

CLKMD.4

…

=

0xF4;

0;

//

Change clock from IHRC to ILRC

disable IHRC

while (1)

{

STOPSYS;

//

enter power-down

if (…) break;

if wakeup happen and check OK, then return to high speed,

else stay in power-down mode again.

}

CLKMD

=

0x34;

//

Change clock from ILRC to IHRC/2

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5.10.3 Wake-up

After entering the Power-Down or Power-Save modes, the PMS171B can be resumed to normal operation

by toggling IO pins. Wake-up from timer and comparator are available for Power-Save mode ONLY. Table

15 shows the differences in wake-up sources between STOPSYS and STOPEXE.

Differences in wake-up sources between STOPSYS and STOPEXE

IO Toggle

Yes

Timer wake-up

comparator

No

STOPSYS

STOPEXE

No

Yes

Table 5: Differences in wake-up sources between Power-Save mode and Power-Down mode

When using the IO pins to wake-up the PMS171B, registers padier should be properly set to enable the

wake-up function for every corresponding pin. The time for normal wake-up is about 3000 ILRC clocks

counting from wake-up event; fast wake-up can be selected to reduce the wake-up time by misc register,

and the time for fast wake-up is about 45 ILRC clocks from IO toggling. Besides, the wake up function in

GPCS controls the comparator.

Suspend mode

STOPEXE suspend

or

Wake-up mode

Wake-up time (t_WUP) from IO toggle

45 * T_ILRC,

Fast wake-up

Where T_ILRCis the time period of ILRC

STOPSYS suspend

STOPEXE suspend

or

3000 * T_ILRC

,

Normal wake-up

Where T_ILRCis the clock period of ILRC

STOPSYS suspend

Please notice that when Code Option is set to Fast boot-up, no matter which wake-up mode is selected in

misc.5, the wake-up mode will be forced to be FAST. If Normal boot-up is selected, the wake-up mode is

determined by misc.5.

5.11 IO Pins

All the pins can be independently set into two states output or input by configuring the data registers (pa, pb),

control registers (pac, pbc) and pull-high registers (paph, pbph). Two pins of them, PB3 & PB6, have

additional pull-low registers (pbpl.3, pbpl.6)Port B[6] and Port B[3] also set into input with pull-low by

configuring the control register (pbc) and pull- low register (pbpl). All these pins have Schmitt-trigger input

buffer and output driver with CMOS level. When it is set to output low, the pull-up resistor is turned off

automatically. When it is set to output high, the pull-low resistor is turned off automatically. If user wants to

read the pin state, please notice that it should be set to input mode before reading the data port; if user reads

the data port when it is set to output mode, the reading data comes from data register, NOT from IO pad. As an

example, Table 6 shows the configuration table of bit 0 of port A. The hardware diagram of IO buffer is also

shown as Fig. 17. Table 7 shows the configuration table of bit 6 of port B. The hardware diagram of IO buffer is

also shown as Fig. 18.

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pa.0 pac.0 paph.0

Description

Input without pull-up resistor

X

0

1

0

1

0

1

X

0

Input with pull-up resistor

Output low without pull-up resistor

Output high without pull-up resistor

Table 6: PA0 Configuration Table

pb.6 pbc.6 pbph.6 pbpl.6

Description

X

0

1

0

1

0

Input without pull-high / pull-low resistor

Input with pull-low resistor

Input with pull-high resistor

Input with both pull-high and pull-low resistor

(Note for the current consumption)

Output low without pull resistor

Output high without pull resistor

X

0

1

0

1

X

Table 7: PB6 Configuration Table

Fig. 17: Hardware diagram of IO buffer with Weak Pull High PMOS

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Fig. 18: Hardware diagram of IO buffer with Weak Pull High PMOS & Weak Pull Low NMOS

One thing should be noted, PA5 and PB0 can be open-drain ONLY when setting to output mode (without Q1).

And by the way, there is a code option PB4_PB5_Drive for PB4 and PB5 to select their drive and sink current.

PB0 and PB7 provide super large current NMOS and PMOS output respectively.

The corresponding bits in registers padier / pbdier should be set to low to prevent leakage current for those

pins are selected to be analog function. When PMS171B is put in power-down or power-save mode, every pin

can be used to wake-up system by toggling its state. Therefore, those pins needed to wake-up system must be

set to input mode and set the corresponding bits of registers padier and pbdier to high. The same reason,

padier.0 should be set high when PA0 is used as external interrupt pin, and so for other external interrupt pins:

PB0, PA4 and PB5.

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5.12 Reset and LVR

5.12.1 Reset

There are many causes to reset the PMS171B, once reset is asserted, most of all the registers in

PMS171B will be set to default values, system should be restarted once abnormal cases happen, or by

jumping program counter to address 0x0. The data memory is in uncertain state when reset comes from

power-up and LVR; however, the content will be kept when reset comes from PRSTB pin or WDT timeout.

5.12.2 LVR reset

By code option, there are many different levels of LVR for reset; usually, user selects LVR reset level to be

in conjunction with operating frequency and supply voltage.

5.13 Analog-to-Digital Conversion (ADC) module

Fig. 19: ADC Block Diagram

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There are 6 registers when using the ADC module, which are:

 ADC Control Register (adcc)

 ADC Regulator Control Register (adcrgc)

 ADC Mode Register (adcm)

 ADC Result Register (adcr)

 Port A/B Digital Input Enable Register (padier, pbdier)

The following steps are required to do the AD conversion procedure:

(1) Configure the voltage reference high by adcrgc register

(2) Configure the AD conversion clock by adcm register

(3) Configure the pin as analog input by padier, pbdier register

(4) Select the ADC input channel by adcc register

(5) Enable the ADC module by adcc register

(6) Execute the AD conversion and check if ADC data is ready.

Set ‘1’ to addc.6 to start the conversion and check whether addc.6 is ‘1’.

(7) Read the ADC result registers:

5.13.1 The input requirement for AD conversion

For the AD conversion to meet its specified accuracy, the charge holding capacitor (C_HOLD) must be allowed

to fully charge to the voltage reference high level and discharge to the voltage reference low level. The

analog input model is shown as Fig. 20, the signal driving source impedance (Rs) and the internal sampling

switch impedance (Rss) will affect the required time to charge the capacitor C_HOLDdirectly. The internal

sampling switch impedance may vary with ADC supply voltage; the signal driving source impedance will

affect accuracy of analog input signal. User must ensure the measured signal is stable before sampling;

therefore, the maximum signal driving source impedance is highly dependent on the frequency of signal to

be measured. The recommended maximum impedance for analog driving source is about 10KΩ under

500KHz input frequency.

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Fig.20: Analog Input Model

Before starting the AD conversion, the minimum signal acquisition time should be met for the selected

analog input signal, the selection of ADCLK must be met the minimum signal acquisition time.

5.13.2 Select the reference high voltage

The ADC reference high voltage can be selected via bit[7] of register adcrgc and its option can be V_DDor

PB1 from external pin.

5.13.3 ADC clock selection

The clock of ADC module (ADCLK) can be selected by adcm register; there are 8 possible options for

ADCLK from CLK÷1 to CLK÷128 (CLK is the system clock). Due to the signal acquisition time T_ACQis one

clock period of ADCLK, the ADCLK must meet that requirement. The recommended ADC clock is to

operate at 2us.

5.13.4 Configure the analog pins

There are 11 analog signals can be selected for AD conversion, 10 analog input signals come from

external pins and one is from internal bandgap reference voltage 1.2V. For external pins, the analog

signals are shared with Port A[0], Port A[3], Port A[4], and Port B[7:1]. To avoid leakage current at the

digital circuit, those pins defined for analog input should disable the digital input function (set the

corresponding bit of padier or pbdier register to be 0).

The measurement signals of ADC belong to small signal; it should avoid the measured signal to be

interfered during the measurement period, the selected pin should:

(1) be set to input mode

(2) turn off weak pull-high and pull-low resistor

(3) set the corresponding pin to analog input by port A/B digital input disable register (padier / pbdier).

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5.13.5 Using the ADC

The following example shows how to use ADC with PB0~PB3.

First, defining the selected pins:

PBC

=

0B_XXXX_0000;

0B_XXXX_0_XXX;

0B_XXXX_0000;

//

PB0 ~ PB3 as Input

PB0 ~ PB3 without pull-high

PB3 without pull-low

PBPH

PBPL

PBDIER

PB0 ~ PB3 digital input is disabled

Next, setting ADCC register, example as below:

$

ADCC Enable, PB3;

ADCC Enable, PB2;

ADCC Enable, PB0;

//

set PB3 as ADC input

set PB2 as ADC input

set PB0 as ADC input

Next, setting ADCM and ADCRGC register, example as below:

$

ADCM 8BIT, /16;

ADCM 8BIT, /8;

ADCRGC VDD;

//

recommend /16 @System Clock=8MHz

recommend /8 @System Clock=4MHz

Then, start the ADC conversion:

AD_START =

while(!AD_DONE) NULL;

1;

//

start ADC conversion

wait ADC conversion result

Finally, it can read ADC result when AD_DONE is high:

BYTE

Data

Data;

ADCR

//

One byte result: ADCR

=

The ADC can be disabled by using the following method:

ADCC Disable;

$

or

ADCC

=

0;

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5.13.6 How to calculate ADC input voltage V_IN

For PMS171B, only VDD but not 1.2V band-gap voltage can be selected as the V_REFof the ADC. When

VDD is not regulated, users have to use the reading of 1.2V band-gap voltage to deduce the input voltage

(V_IN) by the ratio of the readings. The principle is as below:

V_BG/ V_DD= N_BG/ 256 ....(1)

V_IN/ V_DD= N_IN/ 256

Where V_INis the analog input voltage

_BGis the 1.2V band-gap voltage

....(2)

V

N_INis the corresponding ADC reading of V_IN

N_BGis the corresponding ADC reading of V_BG

V_DDis the V_DDat the measuring instant

256 is the full swing reading when V_IN=V_DD(8bit: 2⁸= 256)

(2)/(1) we get

V_IN/V_BG= N_IN/N_BG

And so

V_IN= N_IN/ N_BG*V_BG

It means users can firstly get the readings for V_INand V_BGrespectively in a very short period that VDD

remains unchanged. And then use multiplication and division program module or use look-up table

method to finally get the V_INvoltage.

If necessary, please contact FAE for demo code reference.

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6. IO Registers

6.1. ACC Status Flag Register (flag), IO address = 0x00

Bit Reset

R/W

Description

7 - 4

3

-

Reserved. Please do not use.

0

R/W

OV (Overflow Flag). This bit is set to be 1 whenever the sign operation is overflow.

AC (Auxiliary Carry Flag). There are two conditions to set this bit, the first one is carry out

of low nibble in addition operation and the other one is borrow from the high nibble into low

nibble in subtraction operation.

2

0

R/W

C (Carry Flag). There are two conditions to set this bit, the first one is carry out in addition

operation, and the other one is borrow in subtraction operation. Carry is also affected by

shift with carry instruction.

1

0

R/W

Z (Zero Flag). This bit will be set when the result of arithmetic or logic operation is zero;

Otherwise, it is cleared.

6.2. Stack Pointer Register (sp), IO address = 0x02

Bit Reset R/W

Description

Stack Pointer Register. Read out the current stack pointer, or write to change the stack

pointer. Please notice that bit 0 should be kept 0 due to program counter is 16 bits.

7 - 0 R/W

-

6.3. Clock Mode Register (clkmd), IO address = 0x03

Bit Reset R/W

Description

System clock (CLK) selection:

Type 0, clkmd[3]=0 Type 1, clkmd[3]=1

000: IHRC÷4

000: IHRC÷16

001: IHRC÷2

001: IHRC÷8

010: reserved

010: ILRC÷16 (ICE does NOT Support.)

011: IHRC÷32

7 - 5

111

R/W

011: EOSC÷4

100: EOSC÷2

100: IHRC÷64

101: EOSC

101: EOSC÷8

110: ILRC÷4

11x: reserved

111: ILRC (default)

Internal High RC Enable. 0 / 1: disable / enable

4

3

1

0

R/W

Clock Type Select. This bit is used to select the clock type in bit [7:5].

0 / 1: Type 0 / Type 1

Internal Low RC Enable. 0 / 1: disable / enable

If ILRC is disabled, watchdog timer is also disabled.

Watch Dog Enable. 0 / 1: disable / enable

2

1

R/W

1

0

1

0

R/W

Pin PA5/PRSTB function. 0 / 1: PA5 / PRSTB

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6.4. Interrupt Enable Register (inten), IO address = 0x04

Bit

7

Reset

R/W

Description

Enable interrupt from Timer3. 0 / 1: disable / enable

Enable interrupt from Timer2. 0 / 1: disable / enable

Reserved.

0

6

5

4

Enable interrupt from comparator: disable / enable

Enable interrupt from ADC. 0 / 1: disable / enable

Enable interrupt from Timer16 overflow. 0 / 1: disable / enable

Enable interrupt from PB0/PA4. 0 / 1: disable / enable

Enable interrupt from PA0/PB5. 0 / 1: disable / enable

3

2

1

0

6.5. Interrupt Request Register (intrq), IO address = 0x05

Bit

Reset

R/W

Description

Interrupt Request from Timer3, this bit is set by hardware and cleared by software.

0 / 1: No request / Request

7

-

R/W

Interrupt Request from Timer2, this bit is set by hardware and cleared by software.

0 / 1: No request / Request

6

5

4

-

R/W

Reserved.

Interrupt Request from comparator, this bit is set by hardware and cleared by software.

0 / 1: No request / Request

Interrupt Request from ADC, this bit is set by hardware and cleared by software.

0 / 1: No request / Request

3

2

1

0

-

R/W

Interrupt Request from Timer16, this bit is set by hardware and cleared by software.

0 / 1: No request / Request

Interrupt Request from pin PB0/PA4, this bit is set by hardware and cleared by software.

0 / 1: No request / Request

Interrupt Request from pin PA0/PB5, this bit is set by hardware and cleared by software.

0 / 1: No Request / request

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6.6. Timer16 mode Register (t16m), IO address = 0x06

Bit

Reset R/W

Description

Timer16 Clock source selection.

000: disable

001: CLK (system clock)

010: reserved

7 - 5

000

R/W

011: PA4 falling edge (from external pin)

100: IHRC

101: EOSC

110: ILRC

111: PA0 falling edge (from external pin)

Timer16 clock pre-divider.

00: ÷1

4 - 3

00

01: ÷4

10: ÷16

11: ÷64

Interrupt source selection. Interrupt event happens when the selected bit status is changed.

0 : bit 8 of Timer16

1 : bit 9 of Timer16

2 : bit 10 of Timer16

3 : bit 11 of Timer16

4 : bit 12 of Timer16

5 : bit 13 of Timer16

6 : bit 14 of Timer16

7 : bit 15 of Timer16

2 - 0

000

6.7. Timer2 Bound Register (tm2b), IO address = 0x09

Bit

Reset R/W

0x00 WO

Description

7 - 0

Timer2 bound register.

6.8. External Oscillator setting Register (eoscr), IO address = 0x0a

Bit

Reset R/W

Description

7

0

WO

Enable external crystal oscillator. 0 / 1 : Disable / Enable

External crystal oscillator selection.

00 : reserved

6 - 5

00

WO

01 : low driving capability, for lower frequency, ex: 32KHz crystal oscillator

10 : middle driving capability, for middle frequency, ex: 1MHz crystal oscillator

11 : high driving capability, for higher frequency, ex: 4MHz crystal oscillator

Reserved. Please keep 0 for future compatibility.

4 - 1

0

-

0

WO

Power-down the Bandgap and LVR hardware modules. 0 / 1: normal / power-down

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6.9. Interrupt Edge Select Register (integs), IO address = 0x0c

Bit

Reset

R/W

Description

7 - 5

-

Reserved.

Timer16 edge selection.

4

0

WO 0 : rising edge of the selected bit to trigger interrupt

1 : falling edge of the selected bit to trigger interrupt

PB0/PA4 edge selection.

00: both rising edge and falling edge of the selected bit to trigger interrupt

WO 01: rising edge of the selected bit to trigger interrupt

10: falling edge of the selected bit to trigger interrupt

11: reserved.

3 - 2

00

PA0/PB5 edge selection.

00 : both rising edge and falling edge of the selected bit to trigger interrupt

WO 01 : rising edge of the selected bit to trigger interrupt

10 : falling edge of the selected bit to trigger interrupt

11 : reserved.

1 - 0

00

6.10.Port A Digital Input Enable Register (padier), IO address = 0x0d

Bit

Reset

R/W

Description

Enable PA7 digital input and wake-up event. 1 / 0 : enable / disable

7

1

WO

This bit should be set to low to prevent leakage current when external crystal oscillator is

used. If this bit is set to low, PA7 can NOT be used to wake-up the system.

Enable PA6 digital input and wake-up event. 1 / 0 : enable / disable

6

5

4

1

WO

This bit should be set to low to prevent leakage current when external crystal oscillator is

used. If this bit is set to low, PA6 can NOT be used to wake-up the system.

Enable PA5 digital input and wake-up event. 1 / 0 : enable / disable

This bit can be set to low to disable wake-up from PA5 toggling.

Enable PA4 digital input and wake-up event and interrupt request. 1 / 0 : enable / disable

This bit can be set to low to prevent leakage current when PA4 is assigned as AD input,

and to disable wake-up from PA0 toggling and interrupt request from this pin.

Enable PA3 digital input and wake-up event. 1 / 0 : enable / disable

3

2 - 1

0

1

WO

This bit should be set to low when PA3 is assigned as AD input to prevent leakage current.

If this bit is set to low, PA3 can NOT be used to wake-up the system.

Reserved

Enable PA0 digital input and wake-up event and interrupt request. 1 / 0 : enable / disable

This bit can be set to low to prevent leakage current when PA0 is assigned as AD input,

and to disable wake-up from PA0 toggling and interrupt request from this pin.

6.11.Port B Digital Input Enable Register (pbdier), IO address = 0x0e

Bit

Reset R/W

Description

Enable PB7~PB0 digital input and wake-up event and interrupt request.

1 / 0 : enable / disable

These bits can be set to low to prevent leakage current when PB7~PB1 are assigned as AD

inputs. When disable is selected, the wakeup function and interrupt requests from bit5 or bit0

are also disabled.

7 - 0

0xFF

WO

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6.12. Port A Data Register (pa), IO address = 0x10

Bit

Reset R/W

0x00 R/W Data register for Port A.

Description

7 - 0

6.13. Port A Control Register (pac), IO address = 0x11

Bit

Reset R/W

Description

Port A control registers. This register is used to define input mode or output mode for each

corresponding pin of port A. 0 / 1: input / output

7 - 0

0x00

R/W

Please note that PA5 can be INPUT or OUTPUT LOW ONLY, the output state will be

tri-state when PA5 is programmed into output mode with data 1.

6.14. Port A Pull-High Register (paph), IO address = 0x12

Bit

Reset R/W

Description

Port A pull-high register. This register is used to enable the internal pull-high device on each

7 - 0 0x00 R/W corresponding pin of port A and this pull high function is active only for input mode.

0 / 1 : disable / enable

6.15. Port B Data Register (pb), IO address = 0x14

Bit

Reset R/W

0x00 R/W Data register for Port B.

Description

7 - 0

6.16. Port B Control Register (pbc), IO address = 0x15

Bit

Reset R/W

Description

Port B control register. This register is used to define input mode or output mode for each

corresponding pin of port B. 0 / 1: input / output

7 - 0

0x00 R/W

6.17. Port B Pull-High Register (pbph), IO address = 0x16

Bit

7 - 1

0

Reset R/W

Description

Port B[7:1] pull-high register. This register is used to enable the internal pull-high device on

each corresponding pin of port B and this pull high function is active only for input mode.

0 / 1 : disable / enable

0x00

-

R/W

-

Reserved.

6.18. Port B Pull Low Register (pbpl), IO address = 0x38

Bit

7

Reset

R/W

Description

-

0

-

R/W

-

Reserved.

6

PB6 Pull Low enable. 0/1: Disable/ Enable

Reserved.

5 - 4

3

0

-

R/W

-

PB3 Pull Low enable. 0/1: Disable/ Enable

Reserved.

2- 0

Notice: ICE does NOT support.

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8bit OTP MCU with 8-bit ADC

6.19. Miscellaneous Register (misc), IO address = 0x17

Bit

Reset

R/W

Description

Reserved. (keep 0 for future compatibility)

7 - 6

-

Enable fast Wake-up. Fast wake-up is NOT supported when EOSC is enabled.

0: Normal wake-up.

The wake-up time is 3000 ILRC clocks (Not for fast boot-up)

5

0

WO 1: Fast wake-up.

The wake-up time is 45 ILRC clocks + oscillator stable time.

If wake-up from STOPEXE suspend, there is no oscillator stable time;

If wake-up from STOPSYS suspend, it will be IHRC or ILRC stable time from power-on.

Reserved. (keep 0 for future compatibility)

Disable LVR function.

4 - 3

2

-

0

WO

0 / 1 : Enable / Disable

Watch dog time out period.

00: 8k ILRC clock period

1 - 0

00

WO 01: 16k ILRC clock period

10: 64k ILRC clock period

11: 256k ILRC clock period

6.20. Comparator Control Register (gpcc), IO address = 0x18

Bit

Reset

R/W

Description

Enable comparator.

0 / 1 : disable / enable

7

0

R/W

When this bit is set to enable, please also set the corresponding analog input pins to be

digital disable to prevent IO leakage.

Comparator result of comparator.

6

5

4

-

RO

0: plus input < minus input

1: plus input > minus input

Select whether the comparator result output will be sampled by TM2_CLK?

0

R/W 0: result output NOT sampled by TM2_CLK

1: result output sampled by TM2_CLK

Inverse the polarity of result output of comparator.

R/W 0: polarity is NOT inversed.

1: polarity is inversed.

Selection the minus input (-) of comparator.

000 : PA3

001 : PA4

010 : Internal 1.20 volt bandgap reference voltage

3 - 1

000

R/W

011 : V_{internal R}

100 : PB6 (NOT for ICE)

101 : PB7 (NOT for ICE)

11X: reserved

0

R/W Selection the plus input (+) of comparator. 0/1: V_{internal R}/ PA4

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8bit OTP MCU with 8-bit ADC

6.21. Comparator Selection Register (gpcs), IO address = 0x19

Bit

Reset

R/W

Description

Comparator output enable (to PA0).

0 / 1 : Disable / Enable

7

0

WO

Wakeup by comparator enable. (The comparator wakeup effectively when gpcc.6 electrical

WO level changed)

0 / 1 : disable / enable

6

0

5

4

0

WO Selection of high range of comparator.

WO Selection of low range of comparator.

Selection the voltage level of comparator.

3 - 0

0000

WO

0000 (lowest) ~ 1111 (highest)

6.22. Timer2 Control Register (tm2c), IO address = 0x1c

Bit

Reset

R/W

Description

Timer2 clock selection.

0000 : disable

0001 : CLK (system clock)

0010 : IHRC or IHRC *2 (by code option TMx_source)

0011 : EOSC

0100 : ILRC

0101 : comparator output

011x : reserved

7 - 4

0000

R/W

1000 : PA0 (rising edge)

1001 : ~PA0 (falling edge)

1010 : PB0 (rising edge)

1011 : ~PB0 (falling edge)

1100 : PA4 (rising edge)

1101 : ~PA4 (falling edge)

Notice: In ICE mode and IHRC is selected for Timer2 clock, the clock sent to Timer2 does

NOT be stopped, Timer2 will keep counting when ICE is in halt state.

Timer2 output selection.

00 : disable

3 - 2

00

R/W 01 : PB2 or PB0 (by code option TM2 Output) (ICE doesn’t support PB0.)

10 : PA3

11 : PB4

Timer2 mode selection.

R/W

1

0

0 / 1 : period mode / PWM mode

Enable to inverse the polarity of Timer2 output.

R/W

0 / 1: disable / enable

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8bit OTP MCU with 8-bit ADC

6.23. Timer2 Counter Register (tm2ct), IO address = 0x1d

Bit

Reset R/W

0x00 R/W Bit [7:0] of Timer2 counter register.

Description

7 - 0

6.24. Timer2 Scalar Register (tm2s), IO address = 0x1e

Bit

Reset R/W

Description

PWM resolution selection.

0 : 8-bit

7

0

WO

1 : 6-bit or 7-bit (by code option TMx_bit)

Timer2 clock pre-scalar.

00 : ÷ 1

6 - 5

00

WO

01 : ÷ 4

10 : ÷ 16

11 : ÷ 64

4 - 0 00000

Timer2 clock scalar.

6.25. Timer3 Control Register (tm3c), IO address = 0x32

Bit

Reset

R/W

Description

Timer3 clock selection.

0000 : disable

0001 : CLK (system clock)

0010 : IHRC or IHRC *2 (by code option TMx_source)

0011 : EOSC

0100 : ILRC

0101 : comparator output

011x : reserved

7 - 4

0000

R/W

1000 : PA0 (rising edge)

1001 : ~PA0 (falling edge)

1010 : PB0 (rising edge)

1011 : ~PB0 (falling edge)

1100 : PA4 (rising edge)

1101 : ~PA4 (falling edge)

Notice: In ICE mode and IHRC is selected for Timer3 clock, the clock sent to Timer3 does

NOT be stopped, Timer3 will keep counting when ICE is in halt state.

Timer3 output selection.

00 : disable

3 - 2

00

R/W 01 : PB5

10 : PB6

11 : PB7

Timer3 mode selection.

1

0

R/W

0 / 1 : period mode / PWM mode

Enable to inverse the polarity of Timer3 output.

0 / 1: disable / enable

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8bit OTP MCU with 8-bit ADC

6.26. Timer3 Counter Register (tm3ct), IO address = 0x33

Bit

Reset

R/W

Description

7 - 0

0x00

R/W

Bit [7:0] of Timer3 counter register.

6.27. Timer3 Scalar Register (tm3s), IO address = 0x34

Bit

Reset

R/W

Description

PWM resolution selection.

0 : 8-bit

7

0

WO

1 : 6-bit or 7bit (by code option TMx_bit)

Timer3 clock pre-scalar.

00 : ÷ 1

6 - 5

4 - 0

00

WO

01 : ÷ 4

10 : ÷ 16

11 : ÷ 64

00000

Timer3 clock scalar.

6.28. Timer3 Bound Register (tm3b), IO address = 0x3f

Bit

Reset

R/W

Description

7 - 0

0x00

WO

Timer3 bound register.

6.29. ADC Control Register (adcc), IO address = 0x3b

Bit

Reset

R/W

Description

Enable ADC function. 0/1: Disable/Enable.

7

0

R/W

ADC process control bit.

6

0

R/W

Read “1” to indicate the ADC is ready.

Channel selector. These four bits are used to select input signal for AD conversion.

0000: reserved,

0001: PB1,

0010: PB2,

0011: PB3,

0100: PB4,

0101: PB5,

5 - 2

0001

R/W

0110: PB6,

0111: PB7,

1000: PA3,

1001: PA4,

1010: PA0,

1111: (Channel F) Bandgap reference voltage 1.2V

Others: reserved

Reserved. (keep 0 for future compatibility)

0 - 1

-

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8bit OTP MCU with 8-bit ADC

6.30. ADC Mode Register (adcm), IO address = 0x3c

Bit

Reset

R/W

Description

Reserved (keep 0 for future compatibility)

7 - 4

-

ADC clock source selection.

000: CLK (system clock) ÷ 1,

001: CLK (system clock) ÷ 2,

010: CLK (system clock) ÷ 4,

3 - 1

000

R/W 011: CLK (system clock) ÷ 8,

100: CLK (system clock) ÷ 16,

101: CLK (system clock) ÷ 32,

110: CLK (system clock) ÷ 64,

111: CLK (system clock) ÷ 128,

0

-

Reserved

6.31. ADC Regulator Control Register (adcrgc), IO address = 0x3d

Bit

Reset

R/W

Description

ADC reference high voltage.

WO 0: V_DD,

1: External PIN (PB1)

Reserved.

7

0

-

6 - 0

-

6.32. ADC Result High Register (adcr), IO address = 0x3e

Bit

Reset

R/W

Description

7 - 0

-

RO

These eight read-only bits will be the bit [7:0] of ADC conversion result.

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PMS171B

8bit OTP MCU with 8-bit ADC

7. Instructions

Symbol

Description

ACC

a

Accumulator (Abbreviation of accumulator)

Accumulator (symbol of accumulator in program)

sp

flag

I

Stack pointer

ACC status flag register

Immediate data

&

Logical AND

|

Logical OR

←

^

Movement

Exclusive logic OR

+

Add

－

〜

〒

OV

Z

Subtraction

NOT (logical complement, 1’s complement)

NEG (2’s complement)

Overflow (The operational result is out of range in signed 2’s complement number system)

Zero (If the result of ALU operation is zero, this bit is set to 1)

Carry (The operational result is to have carry out for addition or to borrow carry for subtraction in

unsigned number system)

C

Auxiliary Carry

AC

(If there is a carry out from low nibble after the result of ALU operation, this bit is set to 1)

Program counter for CPU

pc0

M.n

Only addressed in 0~0x3F (0~63) is allowed

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PMS171B

8bit OTP MCU with 8-bit ADC

7.1. Data Transfer Instructions

mov

a, I

Move immediate data into ACC.

Example: mov a, 0x0f;

Result: a ← 0fh;

Affected flags: 『N』Z 『N』C 『N』AC 『N』OV

M, a

a, M

Move data from ACC into memory

Example: mov

MEM, a;

Result: MEM ← a

Affected flags: 『N』Z 『N』C 『N』AC 『N』OV

Move data from memory into ACC

Example: mov

a, MEM ;

Result: a ← MEM; Flag Z is set when MEM is zero.

Affected flags: 『Y』Z 『N』C 『N』AC 『N』OV

a, IO

Move data from IO into ACC

Example: mov

a, pa ;

Result: a ← pa; Flag Z is set when pa is zero.

Affected flags: 『Y』Z 『N』C 『N』AC 『N』OV

IO, a

Move data from ACC into IO

Example: mov

Result: pb ← a

pb, a;

Affected flags: 『N』Z 『N』C 『N』AC 『N』OV

Move 16-bit counting values in Timer16 to memory in word.

Example: ldt16 word;

ldt16 word

Result:

word ← 16-bit timer

Affected flags: 『N』Z 『N』C 『N』AC 『N』OV

Application Example:

------------------------------------------------------------------------------------------------------------------------

word

…

T16val ;

// declare a RAM word

clear

stt16

…

lb@ T16val ;

hb@ T16val ;

T16val ;

// clear T16val (LSB)

// clear T16val (MSB)

// initial T16 with 0

set1

…

t16m.5 ;

// enable Timer16

set0

ldt16

….

t16m.5 ;

T16val ;

// disable Timer 16

// save the T16 counting value to T16val

------------------------------------------------------------------------------------------------------------------------

Store 16-bit data from memory in word to Timer16.

Example: stt16 word;

stt16 word

Result:

16-bit timer ←word

Affected flags: 『N』Z 『N』C 『N』AC 『N』OV

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8bit OTP MCU with 8-bit ADC

Application Example:

------------------------------------------------------------------------------------------------------------------------

word

…

T16val ;

// declare a RAM word

mov

stt16

…

a, 0x34 ;

lb@ T16val , a ; // move 0x34 to T16val (LSB)

a, 0x12 ;

hb@ T16val , a ; // move 0x12 to T16val (MSB)

T16val ;

// initial T16 with 0x1234

----------------------------------------------------------------------------------------------------------------------

idxm a, index Move data from specified memory to ACC by indirect method. It needs 2T to execute this

instruction.

Example: idxm a, index;

Result:

a ← [index], where index is declared by word.

Affected flags: 『N』Z 『N』C 『N』AC 『N』OV

Application Example:

-----------------------------------------------------------------------------------------------------------------------

word

…

RAMIndex ;

// declare a RAM pointer

mov

…

a, 0x5B ;

// assign pointer to an address (LSB)

// save pointer to RAM (LSB)

lb@RAMIndex, a ;

a, 0x00 ;

// assign 0x00 to an address (MSB), should be 0

hb@RAMIndex, a ; // save pointer to RAM (MSB)

idxm

a, RAMIndex ; // move memory data in address 0x5B to ACC

------------------------------------------------------------------------------------------------------------------------

Idxm index, a Move data from ACC to specified memory by indirect method. It needs 2T to execute this

instruction.

Example: idxm index, a;

Result:

[index] ← a; where index is declared by word.

Affected flags: 『N』Z 『N』C 『N』AC 『N』OV

Application Example:

------------------------------------------------------------------------------------------------------------------------

word

…

RAMIndex ;

// declare a RAM pointer

mov

…

a, 0x5B ;

// assign pointer to an address (LSB)

// save pointer to RAM (LSB)

lb@RAMIndex, a ;

a, 0x00 ;

// assign 0x00 to an address (MSB), should be 0

hb@RAMIndex, a ; // save pointer to RAM (MSB)

mov

idxm

a, 0xA5 ;

RAMIndex, a ;

// move 0xA5 to memory in address 0x5B

------------------------------------------------------------------------------------------------------------------------

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8bit OTP MCU with 8-bit ADC

xch

M

Exchange data between ACC and memory.

Example: xch MEM ;

Result:

MEM ← a , a ← MEM

Affected flags: 『N』Z 『N』C 『N』AC 『N』OV

Move the ACC and flag register to memory that address specified in the stack pointer.

Example: pushaf;

pushaf

Result:

[sp] ← {flag, ACC};

sp ← sp + 2 ;

Affected flags: 『N』Z 『N』C 『N』AC 『N』OV

Application Example:

------------------------------------------------------------------------------------------------------------------------

.romadr 0x10 ;

// ISR entry address

pushaf ;

…

// put ACC and flag into stack memory

// ISR program

…

// ISR program

popaf ;

reti ;

// restore ACC and flag from stack memory

------------------------------------------------------------------------------------------------------------------------

Restore ACC and flag from the memory which address is specified in the stack pointer.

Example: popaf;

popaf

Result:

sp ← sp - 2

{Flag, ACC} ← [sp] ;

Affected flags: 『Y』Z 『Y』C 『Y』AC 『Y』OV

;

7.2. Arithmetic Operation Instructions

add

a, I

Add immediate data with ACC, then put result into ACC.

Example: add a, 0x0f ;

Result: a ← a + 0fh

Affected flags: 『Y』Z 『Y』C 『Y』AC 『Y』OV

a, M

M, a

Add data in memory with ACC, then put result into ACC.

Example: add

a, MEM ;

Result: a ← a + MEM

Affected flags: 『Y』Z 『Y』C 『Y』AC 『Y』OV

Add data in memory with ACC, then put result into memory.

Example: add

MEM, a;

Result: MEM ← a + MEM

Affected flags: 『Y』Z 『Y』C 『Y』AC 『Y』OV

addc a, M

addc M, a

Add data in memory with ACC and carry bit, then put result into ACC.

Example: addc

a, MEM ;

Result: a ← a + MEM + C

Affected flags: 『Y』Z 『Y』C 『Y』AC 『Y』OV

Add data in memory with ACC and carry bit, then put result into memory.

Example: addc

Result: MEM ← a + MEM + C

Affected flags: 『Y』Z 『Y』C 『Y』AC 『Y』OV

MEM, a ;

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8bit OTP MCU with 8-bit ADC

addc

sub

a

Add carry with ACC, then put result into ACC.

Example: addc a ;

Result: a ← a + C

Affected flags: 『Y』Z 『Y』C 『Y』AC 『Y』OV

M

Add carry with memory, then put result into memory.

Example: addc

MEM ;

Result: MEM ← MEM + C

Affected flags: 『Y』Z 『Y』C 『Y』AC 『Y』OV

a, I

a, M

M, a

Subtraction immediate data from ACC, then put result into ACC.

Example: sub

a, 0x0f;

Result: a ← a - 0fh ( a + [2’s complement of 0fh] )

Affected flags: 『Y』Z 『Y』C 『Y』AC 『Y』OV

sub

Subtraction data in memory from ACC, then put result into ACC.

Example: sub

a, MEM ;

Result: a ← a - MEM ( a + [2’s complement of M] )

Affected flags: 『Y』Z 『Y』C 『Y』AC 『Y』OV

sub

Subtraction data in ACC from memory, then put result into memory.

Example: sub

MEM, a;

Result: MEM ← MEM - a ( MEM + [2’s complement of a] )

Affected flags: 『Y』Z 『Y』C 『Y』AC 『Y』OV

subc a, M

subc M, a

Subtraction data in memory and carry from ACC, then put result into ACC.

Example: subc

a, MEM;

Result: a ← a – MEM - C

Affected flags: 『Y』Z 『Y』C 『Y』AC 『Y』OV

Subtraction ACC and carry bit from memory, then put result into memory.

Example: subc

MEM, a ;

Result: MEM ← MEM – a - C

Affected flags: 『Y』Z 『Y』C 『Y』AC 『Y』OV

subc

a

Subtraction carry from ACC, then put result into ACC.

Example: subc

a;

Result: a ← a - C

Affected flags: 『Y』Z 『Y』C 『Y』AC 『Y』OV

M

Subtraction carry from the content of memory, then put result into memory.

Example: subc

MEM;

Result: MEM ← MEM - C

Affected flags: 『Y』Z 『Y』C 『Y』AC 『Y』OV

inc

M

Increment the content of memory.

Example: inc

MEM ;

Result: MEM ← MEM + 1

Affected flags: 『Y』Z 『Y』C 『Y』AC 『Y』OV

Decrement the content of memory.

dec

M

Example: dec

MEM;

Result: MEM ← MEM - 1

Affected flags: 『Y』Z 『Y』C 『Y』AC 『Y』OV

Clear the content of memory.

clear

M

Example: clear

Result: MEM ← 0

Affected flags: 『N』Z 『N』C 『N』AC 『N』OV

MEM ;

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8bit OTP MCU with 8-bit ADC

7.3. Shift Operation Instructions

sr

a

Shift right of ACC, shift 0 to bit 7.

Example: sr a ;

Result: a (0,b7,b6,b5,b4,b3,b2,b1) ← a (b7,b6,b5,b4,b3,b2,b1,b0), C ← a(b0)

Affected flags: 『N』Z 『Y』C 『N』AC 『N』OV

Shift right of ACC with carry bit 7 to flag.

Example: src a ;

src

sr

a

Result:

a (c,b7,b6,b5,b4,b3,b2,b1) ← a (b7,b6,b5,b4,b3,b2,b1,b0), C ← a(b0)

Affected flags: 『N』Z 『Y』C 『N』AC 『N』OV

Shift right the content of memory, shift 0 to bit 7.

Example: sr MEM ;

M

Result:

MEM(0,b7,b6,b5,b4,b3,b2,b1) ← MEM(b7,b6,b5,b4,b3,b2,b1,b0), C ← MEM(b0)

Affected flags: 『N』Z 『Y』C 『N』AC 『N』OV

Shift right of memory with carry bit 7 to flag.

Example: src MEM ;

src

sl

M

Result:

MEM(c,b7,b6,b5,b4,b3,b2,b1) ← MEM (b7,b6,b5,b4,b3,b2,b1,b0), C ← MEM(b0)

Affected flags: 『N』Z 『Y』C 『N』AC 『N』OV

Shift left of ACC shift 0 to bit 0.

a

Example: sl a ;

Result:

a (b6,b5,b4,b3,b2,b1,b0,0) ← a (b7,b6,b5,b4,b3,b2,b1,b0), C ← a (b7)

Affected flags: 『N』Z 『Y』C 『N』AC 『N』OV

Shift left of ACC with carry bit 0 to flag.

slc

sl

a

Example: slc a ;

Result: a (b6,b5,b4,b3,b2,b1,b0,c) ← a (b7,b6,b5,b4,b3,b2,b1,b0), C ← a(b7)

Affected flags: 『N』Z 『Y』C 『N』AC 『N』OV

Shift left of memory, shift 0 to bit 0.

M

Example: sl MEM ;

Result:

MEM (b6,b5,b4,b3,b2,b1,b0,0) ← MEM (b7,b6,b5,b4,b3,b2,b1,b0), C ← MEM(b7)

Affected flags: 『N』Z 『Y』C 『N』AC 『N』OV

Shift left of memory with carry bit 0 to flag.

Example: slc MEM ;

slc

M

Result:

MEM (b6,b5,b4,b3,b2,b1,b0,C) ← MEM (b7,b6,b5,b4,b3,b2,b1,b0), C ← MEM (b7)

Affected flags: 『N』Z 『Y』C 『N』AC 『N』OV

swap

a

Swap the high nibble and low nibble of ACC.

Example: swap

Result: a (b3,b2,b1,b0,b7,b6,b5,b4) ← a (b7,b6,b5,b4,b3,b2,b1,b0)

Affected flags: 『N』Z 『N』C 『N』AC 『N』OV

a ;

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8bit OTP MCU with 8-bit ADC

7.4. Logic Operation Instructions

and

or

a, I

a, M

M, a

a, I

Perform logic AND on ACC and immediate data, then put result into ACC.

Example: and a, 0x0f ;

Result: a ← a & 0fh

Affected flags: 『Y』Z 『N』C 『N』AC 『N』OV

Perform logic AND on ACC and memory, then put result into ACC.

Example: and

a, RAM10 ;

Result: a ← a & RAM10

Affected flags: 『Y』Z 『N』C 『N』AC 『N』OV

Perform logic AND on ACC and memory, then put result into memory.

Example: and

MEM, a ;

Result: MEM ← a & MEM

Affected flags: 『Y』Z 『N』C 『N』AC 『N』OV

Perform logic OR on ACC and immediate data, then put result into ACC.

Example: or

a, 0x0f ;

Result: a ← a | 0fh

Affected flags: 『Y』Z 『N』C 『N』AC 『N』OV

or

a, M

Perform logic OR on ACC and memory, then put result into ACC.

Example: or

a, MEM ;

Result: a ← a | MEM

Affected flags: 『Y』Z 『N』C 『N』AC 『N』OV

or

M, a

a, I

Perform logic OR on ACC and memory, then put result into memory.

Example: or

MEM, a ;

Result: MEM ← a | MEM

Affected flags: 『Y』Z 『N』C 『N』AC 『N』OV

xor

Perform logic XOR on ACC and immediate data, then put result into ACC.

Example: xor

a, 0x0f ;

Result: a ← a ^ 0fh

Affected flags: 『Y』Z 『N』C 『N』AC 『N』OV

IO, a

Perform logic XOR on ACC and IO register, then put result into IO register.

Example: xor

pa, a ;

Result: pa ← a ^ pa ; // pa is the data register of port A

Affected flags: 『N』Z 『N』C 『N』AC 『N』OV

xor

a, M

M, a

Perform logic XOR on ACC and memory, then put result into ACC.

Example: xor

a, MEM ;

Result: a ← a ^ RAM10

Affected flags: 『Y』Z 『N』C 『N』AC 『N』OV

Perform logic XOR on ACC and memory, then put result into memory.

Example:

xor

MEM, a ;

Result:

MEM ← a ^ MEM

Affected flags: 『Y』Z 『N』C 『N』AC 『N』OV

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8bit OTP MCU with 8-bit ADC

not

a

Perform 1’s complement (logical complement) of ACC.

Example: not a ;

Result: a ← 〜a

Affected flags: 『Y』Z 『N』C 『N』AC 『N』OV

Application Example:

------------------------------------------------------------------------------------------------------------------------

mov

not

a, 0x38 ;

a ;

// ACC=0X38

// ACC=0XC7

------------------------------------------------------------------------------------------------------------------------

Perform 1’s complement (logical complement) of memory.

not

M

Example: not

MEM ;

Result: MEM ← 〜MEM

Affected flags: 『Y』Z 『N』C 『N』AC 『N』OV

Application Example:

------------------------------------------------------------------------------------------------------------------------

mov

not

a, 0x38 ;

mem, a ;

mem ;

// mem = 0x38

// mem = 0xC7

------------------------------------------------------------------------------------------------------------------------

Perform 2’s complement of ACC.

neg

a

Example: neg

a;

Result: a ← 〒a

Affected flags: 『Y』Z 『N』C 『N』AC 『N』OV

Application Example:

------------------------------------------------------------------------------------------------------------------------

mov

neg

a, 0x38 ;

a ;

// ACC=0X38

// ACC=0XC8

------------------------------------------------------------------------------------------------------------------------

Perform 2’s complement of memory.

neg

M

Example: neg

MEM;

Result: MEM ← 〒MEM

Affected flags: 『Y』Z 『N』C 『N』AC 『N』OV

Application Example:

------------------------------------------------------------------------------------------------------------------------

mov

not

a, 0x38 ;

mem, a ;

mem ;

// mem = 0x38

// mem = 0xC8

------------------------------------------------------------------------------------------------------------------------

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PMS171B

8bit OTP MCU with 8-bit ADC

7.5. Bit Operation Instructions

set0 IO.n

set1 IO.n

swapc IO.n

Set bit n of IO port to low.

Example: set0 pa.5 ;

Result: set bit 5 of port A to low

Affected flags: 『N』Z 『N』C 『N』AC 『N』OV

Set bit n of IO port to high.

Example: set1 pb.5 ;

Result: set bit 5 of port B to high

Affected flags: 『N』Z 『N』C 『N』AC 『N』OV

Swap the nth bit of IO port with carry bit.

Example: swapc

IO.0;

Result: C ← IO.0 , IO.0 ← C

When IO.0 is a port to output pin, carry C will be sent to IO.0;

When IO.0 is a port from input pin, IO.0 will be sent to carry C;

Affected flags: 『N』Z 『Y』C 『N』AC 『N』OV

Application Example1 (serial output) :

------------------------------------------------------------------------------------------------------------------------

...

set1

...

pac.0 ;

// set PA.0 as output

set0

swapc

set1

swapc

...

flag.1 ;

pa.0 ;

flag.1 ;

pa.0 ;

// C=0

// move C to PA.0 (bit operation), PA.0=0

// C=1

// move C to PA.0 (bit operation), PA.0=1

------------------------------------------------------------------------------------------------------------------------

Application Example2 (serial input) :

------------------------------------------------------------------------------------------------------------------------

...

set0

...

pac.0 ;

// set PA.0 as input

swapc

src

pa.0 ;

a ;

// read PA.0 to C (bit operation)

// shift C to bit 7 of ACC

swapc

src

pa.0 ;

a ;

// read PA.0 to C (bit operation)

// shift new C to bit 7, old C

...

------------------------------------------------------------------------------------------------------------------------

set0 M.n

set1 M.n

Set bit n of memory to low.

Example: set0 MEM.5 ;

Result:

set bit 5 of MEM to low

Affected flags: 『N』Z 『N』C 『N』AC 『N』OV

Set bit n of memory to high.

Example: set1 MEM.5 ;

Result:

set bit 5 of MEM to high

Affected flags: 『N』Z 『N』C 『N』AC 『N』OV

Page 82 of 92

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PMS171B

8bit OTP MCU with 8-bit ADC

7.6. Conditional Operation Instructions

ceqsn a, I

Compare ACC with immediate data and skip next instruction if both are equal.

Flag will be changed like as (a ← a – I)

Example: ceqsn

a, 0x55 ;

MEM ;

inc

goto

error ;

Result:

If a=0x55, then “goto error”; otherwise, “inc MEM”.

Affected flags: 『Y』Z 『Y』C 『Y』AC 『Y』OV

Compare ACC with memory and skip next instruction if both are equal.

Flag will be changed like as (a ← a - M)

ceqsn a, M

cneqsn a, M

Example: ceqsn

a, MEM;

Result: If a=MEM, skip next instruction

Affected flags: 『Y』Z 『Y』C 『Y』AC 『Y』OV

Compare ACC with memory and skip next instruction if both are not equal.

Flag will be changed like as (a ← a - M)

Example: cneqsn

a, MEM;

Result: If a≠MEM, skip next instruction

Affected flags: 『Y』Z 『Y』C 『Y』AC 『Y』OV

Compare ACC with immediate data and skip next instruction if both are no equal.

Flag will be changed like as (a ← a - I)

cneqsn a, I

Example: cneqsn

a,0x55 ;

MEM ;

error ;

inc

goto

Result:

If a≠0x55, then “goto error”; Otherwise, “inc MEM”.

Affected flags: 『Y』Z 『Y』C 『Y』AC 『Y』OV

t0sn IO.n

t1sn IO.n

t0sn M.n

t1sn M.n

Check IO bit and skip next instruction if it’s low.

Example: t0sn

pa.5;

Result: If bit 5 of port A is low, skip next instruction

Affected flags: 『N』Z 『N』C 『N』AC 『N』OV

Check IO bit and skip next instruction if it’s high.

Example: t1sn

pa.5 ;

Result: If bit 5 of port A is high, skip next instruction

Affected flags: 『N』Z 『N』C 『N』AC 『N』OV

Check memory bit and skip next instruction if it’s low .

Example: t0sn MEM.5 ;

Result:

If bit 5 of MEM is low, then skip next instruction

Affected flags: 『N』Z 『N』C 『N』AC 『N』OV

Check memory bit and skip next instruction if it’s high.

Example: t1sn MEM.5 ;

Result:

If bit 5 of MEM is high, then skip next instruction

Affected flags: 『N』Z 『N』C 『N』AC 『N』OV

izsn

a

Increment ACC and skip next instruction if ACC is zero.

Example: izsn

Result:

a;

a

←

a + 1,skip next instruction if a = 0

Affected flags: 『Y』Z 『Y』C 『Y』AC 『Y』OV

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PMS171B

8bit OTP MCU with 8-bit ADC

dzsn

izsn

a

Decrement ACC and skip next instruction if ACC is zero.

Example: dzsn a;

Result: A - 1,skip next instruction if a = 0

A

←

Affected flags: 『Y』Z 『Y』C 『Y』AC 『Y』OV

M

Increment memory and skip next instruction if memory is zero.

Example: izsn

Result: MEM

MEM;

MEM + 1, skip next instruction if MEM= 0

←

Affected flags: 『Y』Z 『Y』C 『Y』AC 『Y』OV

dzsn

M

Decrement memory and skip next instruction if memory is zero.

Example: dzsn

Result: MEM

Affected flags: 『Y』Z 『Y』C 『Y』AC 『Y』OV

MEM;

←

MEM - 1, skip next instruction if MEM = 0

7.7. System control Instructions

call

label

Function call, address can be full range address space.

Example: call

Result: [sp]

function1;

pc + 1

←

pc

sp

←

function1

sp + 2

←

Affected flags: 『N』Z 『N』C 『N』AC 『N』OV

goto label

Go to specific address which can be full range address space.

Example: goto

error;

Result: Go to error and execute program.

Affected flags: 『N』Z 『N』C 『N』AC 『N』OV

Place immediate data to ACC, then return.

Example: ret 0x55;

ret

I

Result:

A ← 55h

ret ;

Affected flags: 『N』Z 『N』C 『N』AC 『N』OV

Return to program which had function call.

Example: ret;

Result:

sp ← sp - 2

pc ← [sp]

Affected flags: 『N』Z 『N』C 『N』AC 『N』OV

reti

Return to program that is interrupt service routine. After this command is executed, global

interrupt is enabled automatically.

Example: reti;

Affected flags: 『N』Z 『N』C 『N』AC 『N』OV

No operation.

nop

Example: nop;

Result:

nothing changed

Affected flags: 『N』Z 『N』C 『N』AC 『N』OV

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PMS171B

8bit OTP MCU with 8-bit ADC

pcadd

a

Next program counter is current program counter plus ACC.

Example: pcadd a;

Result: pc ← pc + a

Affected flags: 『N』Z 『N』C 『N』AC 『N』OV

------------------------------------------------------------------------------------------------------------------------

Application Example:

------------------------------------------------------------------------------------------------------------------------

…

mov

pcadd

goto

…

a, 0x02 ;

a ;

err1 ;

correct ;

err2 ;

err3 ;

// PC <- PC+2

// jump here

correct:

// jump here

…

------------------------------------------------------------------------------------------------------------------------

engint

Enable global interrupt enable.

Example: engint;

Result:

Interrupt request can be sent to CPU

Affected flags: 『N』Z 『N』C 『N』AC 『N』OV

Disable global interrupt enable.

disgint

stopsys

stopexe

Example: disgint ;

Result:

Interrupt request is blocked from CPU

Affected flags: 『N』Z 『N』C 『N』AC 『N』OV

System halt.

Example: stopsys;

Result:

Stop the system clocks and halt the system

Affected flags: 『N』Z 『N』C 『N』AC 『N』OV

CPU halt. The oscillator module is still active to output clock, however, system clock is disabled

to save power.

Example: stopexe;

Result:

Stop the system clocks and keep oscillator modules active.

Affected flags: 『N』Z 『N』C 『N』AC 『N』OV

Reset the whole chip, its operation will be same as hardware reset.

Example: reset;

reset

Result:

Reset the whole chip.

Affected flags: 『N』Z 『N』C 『N』AC 『N』OV

Reset Watchdog timer.

wdreset

Example: wdreset ;

Result:

Reset Watchdog timer.

Affected flags: 『N』Z 『N』C 『N』AC 『N』OV

Page 85 of 92

PDK-DS-PMS171B-EN_V103 – Sep. 2, 2020

PMS171B

8bit OTP MCU with 8-bit ADC

7.8. Summary of Instructions Execution Cycle

goto, call, pcadd, ret, reti , idxm

2T

1T

Condition is fulfilled.

ceqsn, cneqsn, t0sn, t1sn, dzsn, izsn

Condition is not fulfilled.

Others

7.9. Summary of affected flags by Instructions

Instruction

mov a, I

Z

-

C

-

AC OV Instruction

Z

-

C

-

AC OV Instruction

Z

Y

-

C

-

AC OV

-

mov M, a

mov IO, a

idxm a, index

pushaf

-

mov a, M

ldt16 word

idxm index, a

popaf

-

mov a, IO

stt16 word

Y

-

xch

M

-

Y

-

Y

-

Y

-

Y

-

add a, I

Y

-

Y

-

Y

-

Y

-

add a, M

addc M, a

sub a, I

Y

-

Y

-

Y

-

Y

-

add M, a

addc a, M

addc

a

addc

M

sub a, M

sub M, a

subc a, M

subc M, a

subc

dec

src

a

subc

clear

M

inc

sr a

src

sl

M

a

sr

M

-

Y

-

sl

a

-

slc

a

-

M

-

slc

and

M

-

swap

and

a

-

and

a, I

Y

-

a, M

Y

-

M, a

Y

-

or a, I

-

or a, M

-

or M, a

-

xor

neg

a, I

-

xor

not

neg

IO, a

-

xor

not

a, M

-

M, a

a

-

a

Y

-

M

-

M

-

set0 IO.n

set1 M.n

t0sn IO.n

t1sn M.n

-

set1 IO.n

ceqsn a, I

t1sn IO.n

-

set0 M.n

ceqsn a, M

t0sn M.n

-

Y

-

Y

-

Y

-

Y

-

Y

-

Y

-

Y

-

Y

-

izsn

dzsn

ret

a

Y

-

Y

-

Y

-

Y

-

dzsn

call

a

Y

-

Y

-

Y

-

Y

-

izsn

M

Y

-

Y

-

Y

-

Y

-

M

label

goto label

reti

I

ret

-

nop

-

pcadd

a

-

engint

-

disgint

reset

-

stopsys

-

stopexe

swapc IO.n

-

wdreset

-

Y

-

ceqsn a, I

Y

cneqsn a, M

Y

7.10.BIT definition

Bit access of RAM is only available for address from 0x00 to 0x3F.

Page 86 of 92

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PMS171B

8bit OTP MCU with 8-bit ADC

8. Code Options

Option

Selection

Description

Enable

Disable

Normal

Strong

4.0V

OTP content is protected and program cannot be read back

OTP content is not protected so program can be read back

PB4 & PB5 Drive/ Sink Current= 5mA/ 10mA

PB4 & PB5 Drive/ Sink Current=20mA/ 40mA

LVR typical range 4.0V

Security

PB4_PB5_Drive

3.5V

LVR typical range 3.5V

3.0V

LVR typical range 3.0V

2.7V

LVR typical range 2.7V

LVR

2.5V

LVR typical range 2.5V

2.2V

2.0V

1.8V

Slow

Fast

LVR typical range 2.2V

LVR typical range 2.0V

LVR typical range 1.8V

About 3000 ILRC clock cycles

About 45 ILRC clock cycles

INTEN/ INTRQ.Bit0 is for PA.0

INTEN/ INTRQ.Bit0 is for PB.5

INTEN/ INTRQ.Bit1 is for PB.0

INTEN/ INTRQ.Bit1 is for PA.4

GPC INT both Rising & Falling edge trigger

Boot-up_Time

Interrupt Src0

Interrupt Src1

PA.0

PB.5

PB.0

PA.4

All Edge

Rising Edge GPC INT at Rising edge trigger

Falling Edge GPC INT at Falling edge trigger

Comparator Edge

GPC_PWM

Disable

Enable

GPC/ PWM are independent

GPC output control PWM output (ICE does NOT Support.)

When tm2c[7:4]= 0010, TM2 clock source = IHRC = 16MHZ

When tm3c[7:4]= 0010, TM3 clock source = IHRC = 16MHZ

When tm2c[7:4]= 0010, TM2 clock source = IHRC*2 = 32MHZ

When tm3c[7:4]= 0010, TM3 clock source = IHRC*2 = 32MHZ

(ICE does NOT Support.)

16MHZ

32MHZ

6 Bit

TMX Source

When tm2s.7=1, TM2 PWM resolution is 6 Bit

When tm3s.7=1, TM3 PWM resolution is 6 Bit

When tm2s.7=1, TM2 PWM resolution is 7 Bit

When tm3s.7=1, TM3 PWM resolution is 7 Bit

(ICE does NOT Support.)

TMX Bit

7 Bit

PB0

PB2

tm2c[3:2]=1 for PB0 as TM2 Output (ICE does NOT Support.)

tm2c[3:2]=1 for PB2 as TM2 Output

TM2 Out1

Page 87 of 92

PDK-DS-PMS171B-EN_V103 – Sep. 2, 2020

PMS171B

8bit OTP MCU with 8-bit ADC

9. Special Notes

This chapter is to remind user who use PMS171B series IC in order to avoid frequent errors upon operation.

9.1. Warning

User must read all application notes of the IC by detail before using it. Please download the related application

notes from the following link:

http://www.padauk.com.tw/tw/technical/index.aspx

9.2. Using IC

9.2.1. IO pin usage and setting

(1) IO pin as digital input

 When IO is set as digital input, the level of Vih and Vil would changes with the voltage and temperature.

Please follow the minimum value of Vih and the maximum value of Vil.

 The value of internal pull high resistor would also changes with the voltage, temperature and pin voltage.

It is not the fixed value.

(2) IO pin as digital input and enable wakeup function



Configure IO pin as input

Set PADIER and PBDIER registers to set the corresponding bit to 1.

(3) PA5 is set to be output pin

PA5 can be set to be Open-Drain output pin only, output high requires adding pull-high resistor

externally.



(4) PA5 is set to be PRSTB input pin



Configure PA5 as input

Set CLKMD.0=1 to enable PA5 as PRSTB input pin

(5) PA5 is set to be input pin and to connect with a push button or a switch by a long wire



Needs to put a >33Ω resistor in between PA5 and the long wire

Avoid using PA5 as input in such application.

(6) PA7 and PA6 as external crystal oscillator



Configure PA7 and PA6 as input

Disable PA7 and PA6 internal pull-high resistor

Configure PADIER register to set PA6 and PA7 as analog input

EOSCR register bit [6:5] selects corresponding crystal oscillator frequency :



01 : for lower frequency, ex : 32KHz

10 : for middle frequency, ex : 455KHz,1MHz

11 : for higher frequency, ex : 4MHz



Program EOSCR.7 =1 to enable crystal oscillator

Ensure EOSC working well before switching from IHRC or ILRC to EOSC

Page 88 of 92

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PMS171B

8bit OTP MCU with 8-bit ADC

Note: Please read the PMC-APN013 carefully. According to PMC-APN013, the crystal oscillator should be

used reasonably. If the following situations happen to cause IC start-up slowly or non-startup, PADAUK

Technology is not responsible for this: the quality of the user's crystal oscillator is not good, the usage

conditions are unreasonable, the PCB cleaner leakage current, or the PCB layouts are unreasonable.

9.2.2. Interrupt

(1) When using the interrupt function, the procedure should be:

Step1: Set INTEN register, enable the interrupt control bit

Step2: Clear INTRQ register

Step3: In the main program, using ENGINT to enable CPU interrupt function

Step4: Wait for interrupt. When interrupt occurs, enter to Interrupt Service Routine

Step5: After the Interrupt Service Routine being executed, return to the main program

*Use DISGINT in the main program to disable all interrupts

*When interrupt service routine starts, use PUSHAF instruction to save ALU and FLAG register.

POPAF instruction is to restore ALU and FLAG register before RETI as below:

void Interrupt (void)

// Once the interrupt occurs, jump to interrupt service routine

{

// enter DISGINT status automatically, no more interrupt is accepted

PUSHAF;

…

POPAF;

}

// RETI will be added automatically. After RETI being executed, ENGINT

status will be restored

(2) INTEN and INTRQ have no initial values. Please set required value before enabling interrupt function

(3) There are two sets of external IO pin interrupt source. Every set is decided by code option Interrupt Src0

and Interrupt Src1 corresponding to the unique interrupt pin. Please comply with the inten / intrq / integs

register when selecting IO pin.

9.2.3. System clock switching

(1) System clock can be switched by CLKMD register. Please notice that, NEVER switch the system clock and

turn off the original clock source at the same time. For example: When switching from clock A to clock B,

please switch to clock B first; and after that turn off the clock A oscillator through CLKMD.



Example : Switch system clock from ILRC to IHRC/2

CLKMD

=

0x36;

0;

// switch to IHRC, ILRC cannot be disabled here

CLKMD.2 =

// ILRC can be disabled at this time



ERROR: Switch ILRC to IHRC and turn off ILRC simultaneously

CLKMD 0x50; // MCU will hang

=

(2) Please ensure the EOSC oscillation has established before switching from ILRC or IHRC to EOSC. MCU

will not check its status. Please wait for a while after enabling EOSC. System clock can be switched to

Page 89 of 92

PDK-DS-PMS171B-EN_V103 – Sep. 2, 2020

PMS171B

8bit OTP MCU with 8-bit ADC

EOSC afterwards. Otherwise, MCU will hang. The example for switching system clock from ILRC to 4MHz

EOSC after boot up as below:

.ADJUST_IC

DISABLE

CLKMD.1 = 0;

// turn off WDT for executing delay instruction

// 4MHz EOSC start to oscillate

$

EOSCR

Enable, 4MHz;

// Delay for EOSC establishment

$ T16M EOSC, /1, BIT10

Word Count = 0;

Stt16 Count;

Intrq.T16 = 0;

while(!Intrq.T16) NULL;

CLKMD = 0xA4;

CLKMD.2 = 0;

// ILRC -> EOSC;

// turn off ILRC only if necessary

The delay duration should be adjusted in accordance with the characteristic of the crystal and PCB. To

measure the oscillator signal by the oscilloscope, please select (x10) on the probe and measure through

PA6(X2) pin to avoid the interference on the oscillator.

9.2.4. Watchdog

Watchdog will be inactive once ILRC is disabled.

9.2.5. TIMER time out

When select $ INTEGS BIT_R (default value) and T16M counter BIT8 to generate interrupt, if T16M counts

from 0, the first interrupt will occur when the counter reaches to 0x100 (BIT8 from 0 to 1) and the second

interrupt will occur when the counter reaches 0x300 (BIT8 from 0 to 1). Therefore, selecting BIT8 as 1 to

generate interrupt means that the interrupt occurs every 512 counts. Please notice that if T16M counter is

restarted, the next interrupt will occur once Bit8 turns from 0 to 1.

If select $ INTEGS BIT_F(BIT triggers from 1 to 0) and T16M counter BIT8 to generate interrupt, the T16M

counter changes to an interrupt every 0x200/0x400/0x600/. Please pay attention to two differences with

setting INTEGS methods.

9.2.6. IHRC

(1)

The IHRC frequency calibration is performed when IC is programmed by the writer.

Because the characteristic of the Epoxy Molding Compound (EMC) would some degrees affects the

IHRC frequency (either for package or COB), if the calibration is done before molding process, the

actual IHRC frequency after molding may be deviated or becomes out of spec. Normally, the frequency

is getting slower a bit.

(2)

(3)

(4)

It usually happens in COB package or Quick Turnover Programming (QTP). And PADAUK would not

take any responsibility for this situation.

Users can make some compensatory adjustments according to their own experiences. For example,

users can set IHRC frequency to be 0.5% ~ 1% higher and aim to get better re-targeting after molding.

Page 90 of 92

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PMS171B

8bit OTP MCU with 8-bit ADC

9.2.7. LVR

LVR level selection is done at compile time. User must select LVR based on the system working frequency

and power supply voltage to make the MCU work stably.

The following are Suggestions for setting operating frequency, power supply voltage and LVR level:

SYSCLK

8MHz

VDD

LVR

≧ 3.0V

≧ 2.2V

≧ 1.8V

≧ 3.0V

≧ 2.2V

≧ 1.8V

4MHz

2MHz

Table 8: LVR setting for reference

(1) The setting of LVR (1.8V ~ 4.0V) will be valid just after successful power-on process.

(2) User can set MISC.2 as “1” to disable LVR. However, V_DDmust be kept as exceeding the lowest working

voltage of chip; Otherwise IC may work abnormally.

(3) The LVR function will be invalid when IC in stopexe or stopsys mode.

9.2.8. Programming Writing

There are 6 signals for programming PMS171B: PA3, PA4, PA5, PA6, V_DD, and GND.

If using PDK3S-P-002 to program PMS171B, please put the jumper over CN39. For 16pin package, please

put the IC at the very top of the Textool. For 14pin package, please put the IC downwards by one space from

the top of the Textool. For 10pin package (such as MSOP10), please put the IC downwards by three spaces.

For 8pin package, please put the IC downwards by four spaces from the top of the Textool. Other packages

could be programmed by appropriate connection by the users. All the signals on the left side pins of the

jumper are identical and same as the labeled on CN42 at left bottom corner: they are V_DD, PA0 (not required),

PA3, PA4, PA5, PA6, PA7 (not required), and GND.

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PMS171B

8bit OTP MCU with 8-bit ADC

If user use PDK5S-P-003 or above to program, please follow the instruction displayed at the software to

connect the jumper.

 Special notes about voltage and current while Multi-Chip-Package(MCP) or On-Board Programming

(1) PA5 (V_PP) may be higher than 11V.

(2)

V_DDmay be higher than 7.8V, and its maximum current may reach about 20mA.

(3) All other signal pins level (except GND) are the same as V_DD.

User should confirm when using this product in MCP or On-Board Programming, the peripheral circuit or

components will not be destroyed or limit the above voltages.

9.3 Using ICE

(1) PDK5S-I-S01/2(B) supports PMS171B MCU emulation work, the following items should be noted when

using PDK5S-I-S01/2(B) to emulate PMS171B:



PDK5S-I-S01/2(B) doesn’t support SYSCLK=ILRC/16 of PMS171B.

PDK5S-I-S01/2(B) doesn’t support the function TM2C.PB0 of PMS171B.

PDK5S-I-S01/2(B) doesn’t support the code options: GPC_PWM, TMx_source, TMx_bit, TM2_Out1.



PDK5S-I-S01/2(B) doesn’t support the function PBPL (PB pull low)

If the comparator doesn’t need to wake up “stopexe”, please set GPCC.7 = 0, GPCS.6 = 0

When using PB1 in ADCRGC, PA1 must float.

When using GPCC output, PA3 will be influenced.

When simulating PWM waveform, please check the waveform during program running. When the ICE is

suspended or single-step running, its waveform may be inconsistent with the reality.



The ILRC frequency of the PDK5S-I-S01/2(B) simulator is different from the actual IC and is

uncalibrated, with a frequency range of about 34K~38KHz.



Fast Wakeup time is different from ICE: 128 SysClk, PMS171B: 45 ILRC

Watch dog time out period is different from ICE:

WDT period

misc[1:0]=00

misc[1:0]=01

misc[1:0]=10

misc[1:0]=11

PDK5S-I-S01/2(B)

2048 * T_ILRC

PMS171B

8192 * T_ILRC

16384 * T_ILRC

65536 * T_ILRC

262144 * T_ILRC

4096 * T_ILRC

16384 * T_ILRC

256 * T_ILRC

Page 92 of 92

PDK-DS-PMS171B-EN_V103 – Sep. 2, 2020


型号：	PMS171B
厂家：	PADAUK Technology
描述：	8bit OTP MCU with 8-bit ADC
文件：	总92页 (文件大小：2171K)
中文：	中文翻译
下载：	下载PDF数据表文档文件

PMS171B [PADAUK]

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