LPC2158FBD100 [NXP]
Single-chip 16-bit/32-bit microcontrollers; 512 kB flash, with 32 segment x 4 LCD driver; 单芯片16位/ 32位微控制器; 512 kB的闪存，带有32段×4的LCD驱动器
| 型号： | LPC2158FBD100 |
| 厂家： | 
NXP |
| 描述： | Single-chip 16-bit/32-bit microcontrollers; 512 kB flash, with 32 segment x 4 LCD driver |
| 文件： | 总45页 (文件大小：218K) |
| 中文： | 中文翻译 | 下载： | 下载PDF数据表文档文件 |
LPC2157/2158
Single-chip 16-bit/32-bit microcontrollers; 512 kB flash, with
32 segment x 4 LCD driver
Rev. 01 — 15 October 2008
Product data sheet
1. General description
The LPC2157/2158 is a multi-chip module consisting of a LPC2138/2148 single-chip
microcontroller combined with a PCF8576D Universal LCD driver in a low-cost 100-pin
package. The LCD driver provides 32 segments and supports from 1 to 4 backplanes.
Display overhead is minimized by an on-chip display RAM with auto-increment
addressing. Refer to the respective LPC2148 and LPC2138 user manual for details.
2. Features
I 128-bit wide interface/accelerator enables high-speed 60 MHz operation.
N 32 kB to 40 kB of on-chip static RAM and 512 kB of on-chip flash memory.
I USB 2.0 Full-speed compliant device controller with 2 kB of endpoint RAM.
N An additional 8 kB of on-chip RAM accessible to USB by DMA (LPC2158 only).
I 32 segment × 4 backplane LCD controller supports from 1 to 4 backplanes.
I Single 10-bit DAC provides variable analog output.
I Low power Real-Time Clock (RTC) with independent power and 32 kHz clock input.
I Multiple serial interfaces including two UARTs (16C550), two Fast I2C-bus (400 kbit/s),
SPI and SSP with buffering and variable data length capabilities.
I High-accuracy internal RC oscillator option allows operation without external oscillator
components. The RC oscillator option is selectable and fine tunable.
I 2.4 V to 3.6 V VDD operating range. I/O pins are 5 V tolerant (may be pulled up or
driven to 5.5 V).
I 100-pin LQFP package with 38 microcontroller I/O pins minimum.
I Individual enable/disable of peripheral functions as well as peripheral clock scaling for
additional power optimization.
3. Ordering information
Table 1.
Ordering information
Type number
Package
Name
Description
Version
LPC2157FBD100
LPC2158FBD100
LQFP100
LQFP100
plastic low profile quad flat package; 100 leads; body 14 × 14 × 1.4 mm
plastic low profile quad flat package; 100 leads; body 14 × 14 × 1.4 mm
SOT407-1
SOT407-1
LPC2157/2158
NXP Semiconductors
Single-chip 16-bit/32-bit microcontrollers
4. Block diagram
S[31:0]
P1[31:25],
P1[17:16]
BP[3:0]
PCF8576D
LPC2157/
LPC2158
MCU
LCD
(1)
CONTROLLER
P0[31:28], P0[27:26]
,
P0[25], P0[23:0]
V
LCD
002aad382
(1) LPC2157 only.
Fig 1. Block diagram of LPC2157/2158
LPC2157_2158_1
© NXP B.V. 2008. All rights reserved.
Product data sheet
Rev. 01 — 15 October 2008
2 of 45
LPC2157/2158
NXP Semiconductors
Single-chip 16-bit/32-bit microcontrollers
(1)
(1)
TMS
(1)
TDI
(1)
XTAL2
(1)
TRST
TCK
TDO
XTAL1 RESET
LPC2157/2158
PLL0
TEST/DEBUG
INTERFACE
P1[31:25],
P1[17:16]
SYSTEM
FUNCTIONS
system
clock
FAST GENERAL
PURPOSE I/O
ARM7TDMI-S
P0[31:28],
PLL1
(3)
P0[27:26]
P0[25],
P0[23:0]
AHB BRIDGE
VECTORED
INTERRUPT
CONTROLLER
USB
clock
ARM7 local bus
AMBA AHB
(Advanced High-performance Bus)
INTERNAL
SRAM
INTERNAL
FLASH
CONTROLLER
CONTROLLER
AHB
DECODER
8 kB RAM
AHB TO APB
BRIDGE
APB
DIVIDER
SHARED WITH
32 kB
SRAM
512 kB
FLASH
(2)
USB DMA
APB (advanced
peripheral bus)
D+
D−
UP_LED
CONNECT
VBUS
USB 2.0 FULL-SPEED
DEVICE CONTROLLER
EXTERNAL
INTERRUPTS
EINT3 to
EINT0
(2)
WITH DMA
4 × CAP0
4 × CAP1
8 × MAT0
SCL0, SCL1
SDA0, SDA1
CAPTURE/COMPARE
(W/EXTERNAL CLOCK)
TIMER 0/TIMER 1
2
I C-BUS SERIAL
INTERFACES 0 AND 1
8 × MAT1
AD0[7:6],
(3)
SCK0, SCK1
AD0[5]
AD0[0]
(3)
A/D CONVERTERS
0 AND 1
SPI AND SSP
SERIAL INTERFACES
MOSI0, MOSI1
MISO0, MISO1
SSEL0, SSEL1
AD0[4:1]
AD1[7:0]
TXD0, TXD1
RXD0, RXD1
D/A CONVERTER
UART0/UART1
AOUT
DSR1,CTS1,
RTS1, DTR1,
DCD1,RI1
P0[31:28] and
P0[25:0]
RTCX1
RTCX2
VBAT
GENERAL
PURPOSE I/O
REAL-TIME CLOCK
P1[31:16]
WATCHDOG
TIMER
PWM[6:1]
PWM0
SYSTEM
CONTROL
002aad384
(1) Pins shared with GPIO.
(2) USB DMA controller with 8 kB of RAM accessible as general purpose RAM and/or DMA is available in LPC2158 only.
(3) LPC2157 only.
Fig 2. Microcontroller section block diagram
LPC2157_2158_1
© NXP B.V. 2008. All rights reserved.
Product data sheet
Rev. 01 — 15 October 2008
3 of 45
LPC2157/2158
NXP Semiconductors
Single-chip 16-bit/32-bit microcontrollers
BP0 BP1 BP2 BP3
S[31:0]
V
DD(LCD)
BACKPLANE
OUTPUTS
DISPLAY SEGMENT OUTPUTS
LCD
VOLTAGE
SELECTOR
DISPLAY LATCH
SHIFT REGISTER
LCD BIAS
GENERATOR
V
LCD
CLK
TIMING
BLINKER
INPUT
BANK
SELECTOR
DISPLAY
RAM
40 × 4 BITS
OUTPUT
BANK
SELECTOR
SYNC
DISPLAY
CONTROLLER
POWER-
ON
RESET
OSCILLATOR
OSC
DATA
POINTER
COMMAND
DECODER
V
SS
SCL_LCD
SDA_LCD
SUB-
ADDRESS
COUNTER
2
INPUT
FILTERS
I C-BUS
CONTROLLER
SA0
A0 A1 A2
002aad449
Fig 3. LCD display controller block diagram
5. Pinning information
5.1 Pinning
1
75
LPC2157FBD
25
51
002aad385
Fig 4. Pin configuration for LPC2157
LPC2157_2158_1
© NXP B.V. 2008. All rights reserved.
Product data sheet
Rev. 01 — 15 October 2008
4 of 45
LPC2157/2158
NXP Semiconductors
Single-chip 16-bit/32-bit microcontrollers
1
75
LPC2158FBD
25
51
002aad444
Fig 5. Pin configuration for LPC2158
5.2 Pin description
Table 2.
Pin description LPC2157
Symbol
Pin
Type
Description
P0[0] to P0[31]
I/O
Port 0: Port 0 is a 32-bit I/O port with individual direction controls for each bit.
Total of 31 pins of the Port 0 can be used as a general purpose bidirectional
digital I/Os while P0[31] is output only pin. The operation of port 0 pins
depends upon the pin function selected via the pin connect block.
Pin P0[24] is not available.
P0[0]/TXD0/
PWM1
7[1]
I/O
O
P0[0] — General purpose input/output digital pin (GPIO).
TXD0 — Transmitter output for UART0.
O
PWM1 — Pulse Width Modulator output 1.
P0[1]/RXD0/
PWM3/EINT0
9[2]
I/O
I
P0[1] — General purpose input/output digital pin (GPIO).
RXD0 — Receiver input for UART0.
O
PWM3 — Pulse Width Modulator output 3.
I
EINT0 — External interrupt 0 input.
P0[2]/SCL0/
CAP0[0]
10[3]
I/O
I/O
I
P0[2] — General purpose input/output digital pin (GPIO).
SCL0 — I2C0 clock input/output. Open-drain output (for I2C-bus compliance).
CAP0[0] — Capture input for Timer 0, channel 0.
P0[3] — General purpose input/output digital pin (GPIO).
SDA0 — I2C0 data input/output. Open-drain output (for I2C-bus compliance).
MAT0[0] — Match output for Timer 0, channel 0.
EINT1 — External interrupt 1 input.
P0[3]/SDA0/
MAT0[0]/EINT1
14[3]
I/O
I/O
O
I
P0[4]/SCK0/
CAP0[1]/AD0[6]
15[4]
I/O
I/O
I
P0[4] — General purpose input/output digital pin (GPIO).
SCK0 — Serial clock for SPI0. SPI clock output from master or input to slave.
CAP0[1] — Capture input for Timer 0, channel 1.
AD0[6] — ADC 0, input 6.
I
P0[5]/MISO0/
MAT0[1]/AD0[7]
17[4]
I/O
I/O
P0[5] — General purpose input/output digital pin (GPIO).
MISO0 — Master In Slave Out for SPI0. Data input to SPI master or data
output from SPI slave.
O
I
MAT0[1] — Match output for Timer 0, channel 1.
AD0[7] — ADC 0, input 7.
LPC2157_2158_1
© NXP B.V. 2008. All rights reserved.
Product data sheet
Rev. 01 — 15 October 2008
5 of 45
LPC2157/2158
NXP Semiconductors
Single-chip 16-bit/32-bit microcontrollers
Table 2.
Symbol
Pin description LPC2157 …continued
Pin
Type
I/O
Description
P0[6]/MOSI0/
18[4]
P0[6] — General purpose input/output digital pin (GPIO).
CAP0[2]/AD1[0]
I/O
MOSI0 — Master Out Slave In for SPI0. Data output from SPI master or data
input to SPI slave.
I
CAP0[2] — Capture input for Timer 0, channel 2.
AD1[0] — ADC 1, input 0.
I
P0[7]/SSEL0/
PWM2/EINT2
19[2]
20[4]
21[2]
22[4]
23[3]
24[4]
25[4]
26[3]
I/O
I
P0[7] — General purpose input/output digital pin (GPIO).
SSEL0 — Slave Select for SPI0. Selects the SPI interface as a slave.
PWM2 — Pulse Width Modulator output 2.
O
I
EINT2 — External interrupt 2 input.
P0[8]/TXD1/
PWM4/AD1[1]
I/O
O
O
I
P0[8] — General purpose input/output digital pin (GPIO).
TXD1 — Transmitter output for UART1.
PWM4 — Pulse Width Modulator output 4.
AD1[1] — ADC 1, input 1.
P0[9]/RXD1/
PWM6/EINT3
I/O
I
P0[9] — General purpose input/output digital pin (GPIO).
RXD1 — Receiver input for UART1.
O
I
PWM6 — Pulse Width Modulator output 6.
EINT3 — External interrupt 3 input.
P0[10]/RTS1/
CAP1[0]/AD1[2]
I/O
O
I
P0[10] — General purpose input/output digital pin (GPIO).
RTS1 — Request to Send output for UART1.
CAP1[0] — Capture input for Timer 1, channel 0.
AD1[2] — ADC 1, input 2.
I
P0[11]/CTS1/
CAP1[1]/SCL1
I/O
I
P0[11] — General purpose input/output digital pin (GPIO).
CTS1 — Clear to Send input for UART1.
I
CAP1[1] — Capture input for Timer 1, channel 1.
SCL1 — I2C1 clock input/output. Open-drain output (for I2C-bus compliance)
P0[12] — General purpose input/output digital pin (GPIO).
DSR1 — Data Set Ready input for UART1.
MAT1[0] — Match output for Timer 1, channel 0.
AD1[3] — ADC 1 input 3.
I/O
I/O
I
P0[12]/DSR1/
MAT1[0]/AD1[3]
O
I
P0[13]/DTR1/
MAT1[1]/AD1[4]
I/O
O
O
I
P0[13] — General purpose input/output digital pin (GPIO).
DTR1 — Data Terminal Ready output for UART1.
MAT1[1] — Match output for Timer 1, channel 1.
AD1[4] — ADC 1 input 4.
P0[14]/DCD1/
EINT1/SDA1
I/O
I
P0[14] — General purpose input/output digital pin (GPIO).
DCD1 — Data Carrier Detect input for UART1.
EINT1 — External interrupt 1 input.
I
I/O
SDA1 — I2C1 data input/output. Open-drain output (for I2C-bus compliance).
Note: LOW on this pin while RESET is LOW forces on-chip bootloader to take
over control of the part after reset.
LPC2157_2158_1
© NXP B.V. 2008. All rights reserved.
Product data sheet
Rev. 01 — 15 October 2008
6 of 45
LPC2157/2158
NXP Semiconductors
Single-chip 16-bit/32-bit microcontrollers
Table 2.
Symbol
Pin description LPC2157 …continued
Pin
Type
Description
P0[15]/RI1/
EINT2/AD1[5]
28[4]
I/O
I
P0[15] — General purpose input/output digital pin (GPIO).
RI1 — Ring Indicator input for UART1.
I
EINT2 — External interrupt 2 input.
I
AD1[5] — ADC 1, input 5.
P0[16]/EINT0/
MAT0[2]/CAP0[2]
29[2]
30[1]
79[1]
I/O
I
P0[16] — General purpose input/output digital pin (GPIO).
EINT0 — External interrupt 0 input.
O
I
MAT0[2] — Match output for Timer 0, channel 2.
CAP0[2] — Capture input for Timer 0, channel 2.
P0[17] — General purpose input/output digital pin (GPIO).
CAP1[2] — Capture input for Timer 1, channel 2.
SCK1 — Serial Clock for SSP. Clock output from master or input to slave.
MAT1[2] — Match output for Timer 1, channel 2.
P0[18] — General purpose input/output digital pin (GPIO).
CAP1[3] — Capture input for Timer 1, channel 3.
P0[17]/CAP1[2]/
SCK1/MAT1[2]
I/O
I
I/O
O
I/O
I
P0[18]/CAP1[3]/
MISO1/MAT1[3]
I/O
MISO1 — Master In Slave Out for SSP. Data input to SPI master or data output
from SSP slave.
O
MAT1[3] — Match output for Timer 1, channel 3.
P0[19] — General purpose input/output digital pin (GPIO).
MAT1[2] — Match output for Timer 1, channel 2.
P0[19]/MAT1[2]/
MOSI1/CAP1[2]
80[1]
I/O
O
I/O
MOSI1 — Master Out Slave In for SSP. Data output from SSP master or data
input to SSP slave.
I
CAP1[2] — Capture input for Timer 1, channel 2.
P0[20] — General purpose input/output digital pin (GPIO).
MAT1[3] — Match output for Timer 1, channel 3.
SSEL1 — Slave Select for SSP. Selects the SSP interface as a slave.
EINT3 — External interrupt 3 input.
P0[20]/MAT1[3]/
SSEL1/EINT3
81[2]
91[4]
92[4]
I/O
O
I
I
P0[21]/PWM5/
AD1[6]/CAP1[3]
I/O
O
I
P0[21] — General purpose input/output digital pin (GPIO).
PWM5 — Pulse Width Modulator output 5.
AD1[6] — ADC 1, input 6.
I
CAP1[3] — Capture input for Timer 1, channel 3.
P0[22] — General purpose input/output digital pin (GPIO).
AD1[7] — ADC 1, input 7.
P0[22]/AD1[7]/
CAP0[0]/
I/O
I
MAT0[0]
I
CAP0[0] — Capture input for Timer 0, channel 0.
MAT0[0] — Match output for Timer 0, channel 0.
P0[23] — General purpose input/output digital pin (GPIO).
P0[25] — General purpose input/output digital pin (GPIO).
AD0[4] — ADC 0, input 4.
O
I/O
I/O
I
P0[23]
84[1]
97[5]
P0[25]/AD0[4]/
AOUT
O
I/O
I
AOUT — DAC output.
P0[26]/AD0[5]
98[7]
P0[26] — General purpose input/output digital pin (GPIO).
AD0[5] — ADC 0, input 5. This analog input is always connected to its pin.
LPC2157_2158_1
© NXP B.V. 2008. All rights reserved.
Product data sheet
Rev. 01 — 15 October 2008
7 of 45
LPC2157/2158
NXP Semiconductors
Single-chip 16-bit/32-bit microcontrollers
Table 2.
Symbol
Pin description LPC2157 …continued
Pin
Type
Description
P0[27]/AD0[0]/
CAP0[1]/MAT0[1]
99[7]
I/O
P0[27] — General purpose input/output digital pin (GPIO).
AD0[0] — ADC 0, input 0. This analog input is always connected to its pin.
CAP0[1] — Capture input for Timer 0, channel 1.
MAT0[1] — Match output for Timer 0, channel 1.
P0[28] — General purpose input/output digital pin (GPIO).
AD0[1] — ADC 0, input 1.
I
I
O
I/O
I
P0[28]/AD0[1]/
CAP0[2]/MAT0[2]
1[4]
2[4]
3[4]
5[6]
I
CAP0[2] — Capture input for Timer 0, channel 2.
MAT0[2] — Match output for Timer 0, channel 2.
P0[29] — General purpose input/output digital pin (GPIO).
AD0[2] — ADC 0, input 2.
O
I/O
I
P0[29]/AD0[2]/
CAP0[3]/MAT0[3]
I
CAP0[3] — Capture input for Timer 0, channel 3.
MAT0[3] — Match output for Timer 0, channel 3.
P0[30] — General purpose input/output digital pin (GPIO).
AD0[3] — ADC 0, input 3.
O
I/O
I
P0[30]/AD0[3]/
EINT3/CAP0[0]
I
EINT3 — External interrupt 3 input.
I
CAP0[0] — Capture input for Timer 0, channel 0.
P0[31] — General purpose output only digital pin.
P0[31]
O
I/O
P1[0] to P1[31]
Port 1: Port 1 is a 32-bit bidirectional I/O port with individual direction controls
for each bit. The operation of port 1 pins depends upon the pin function
selected via the pin connect block. Pins 0 through 15 and 18 through 24 of
port 1 are not available.
P1[16]
4[6]
100[6]
16[6]
I/O
I/O
I/O
I
P1[16] — General purpose input/output digital pin (GPIO).
P1[17] — General purpose input/output digital pin (GPIO).
P1[25] — General purpose input/output digital pin (GPIO).
EXTIN0 — External Trigger Input. Standard I/O with internal pull-up.
P1[26] — General purpose input/output digital pin (GPIO).
P1[17]
P1[25]/EXTIN0
P1[26]/RTCK
12[6]
I/O
I/O
RTCK — Returned Test Clock output. Extra signal added to the JTAG port.
Assists debugger synchronization when processor frequency varies.
Bidirectional pin with internal pull-up.
Note: LOW on RTCK while RESET is LOW enables pins P1[31:26] to operate
as Debug port after reset.
P1[27]/TDO
P1[28]/TDI
P1[29]/TCK
P1[30]/TMS
P1[31]/TRST
90[6]
86[6]
82[6]
78[6]
8[6]
I/O
O
P1[27] — General purpose input/output digital pin (GPIO).
TDO — Test Data out for JTAG interface.
I/O
I
P1[28] — General purpose input/output digital pin (GPIO).
TDI — Test Data in for JTAG interface.
I/O
I
P1[29] — General purpose input/output digital pin (GPIO).
TCK — Test Clock for JTAG interface.
I/O
I
P1[30] — General purpose input/output digital pin (GPIO).
TMS — Test Mode Select for JTAG interface.
P1[31] — General purpose input/output digital pin (GPIO).
TRST — Test Reset for JTAG interface.
I/O
I
LPC2157_2158_1
© NXP B.V. 2008. All rights reserved.
Product data sheet
Rev. 01 — 15 October 2008
8 of 45
LPC2157/2158
NXP Semiconductors
Single-chip 16-bit/32-bit microcontrollers
Table 2.
Symbol
RESET
Pin description LPC2157 …continued
Pin
Type
Description
83[8]
I
External reset input: A LOW on this pin resets the device, causing I/O ports
and peripherals to take on their default states, and processor execution to
begin at address 0. TTL with hysteresis, 5 V tolerant.
XTAL1
XTAL2
RTCX1
RTCX2
VSS
88[9]
87[9]
93[9]
94[9]
O
I
Input from the oscillator amplifier.
Output to the oscillator circuit and internal clock generator circuits.
Input to the RTC oscillator circuit.
I
O
I
Output from the RTC oscillator circuit.
Ground: 0 V reference.
6, 13, 32,
39, 40,
85, 95
VDD
11, 27, 33 I
3.3 V power supply: This is the power supply voltage for the core and I/O
ports.
VDDA
96
I
Analog 3.3 V power supply: This should be nominally the same voltage as
VDD but should be isolated to minimize noise and error. This voltage is only
used to power the on-chip ADC(s) and DAC.
VDD(LCD)
VLCD
38
41
89
I
I
I
1.8 V to 5.5 V power supply: Power supply voltage for the PCF8576D.
LCD power supply: LCD voltage.
VREF
ADC reference voltage: This should be nominally less than or equal to the
VDD voltage but should be isolated to minimize noise and error. Level on this
pin is used as a reference for ADC(s) and DAC.
VBAT
31
I
RTC power supply voltage: 3.3 V on this pin supplies the power to the RTC.
SDA LCD — I2C-bus data signal for the LCD controller.
SCL LCD — I2C-bus clock signal for the LCD controller.
SYNC — cascade synchronization input/output
CLK — external clock input/output
SDA_LCD
SCL_LCD
SYNC
34
I/O
I
35
36
I/O
I/O
O
CLK
37
BP0 to BP3
S0 to S31
42 to 45
46 to 77
BP0 to BP3: LCD backplane outputs.
O
S0 to S31: LCD segment outputs.
[1] 5 V tolerant pad providing digital I/O functions with TTL levels and hysteresis and 10 ns slew rate control.
[2] 5 V tolerant pad providing digital I/O functions with TTL levels and hysteresis and 10 ns slew rate control. If configured for an input
function, this pad utilizes built-in glitch filter that blocks pulses shorter than 3 ns.
[3] Open-drain 5 V tolerant digital I/O I2C-bus 400 kHz specification compatible pad. It requires external pull-up to provide an output
functionality.
[4] 5 V tolerant pad providing digital I/O (with TTL levels and hysteresis and 10 ns slew rate control) and analog input function. If configured
for an input function, this pad utilizes built-in glitch filter that blocks pulses shorter than 3 ns. When configured as an ADC input, digital
section of the pad is disabled.
[5] 5 V tolerant pad providing digital I/O (with TTL levels and hysteresis and 10 ns slew rate control) and analog output function. When
configured as the DAC output, digital section of the pad is disabled.
[6] 5 V tolerant pad with built-in pull-up resistor providing digital I/O functions with TTL levels and hysteresis and 10 ns slew rate control.
The pull-up resistor’s value typically ranges from 60 kΩ to 300 kΩ.
[7] Pad is designed in accordance with the Universal Serial Bus (USB) specification, revision 2.0 (Full-speed and Low-speed mode only).
[8] 5 V tolerant pad providing digital input (with TTL levels and hysteresis) function only.
[9] Pad provides special analog functionality.
LPC2157_2158_1
© NXP B.V. 2008. All rights reserved.
Product data sheet
Rev. 01 — 15 October 2008
9 of 45
LPC2157/2158
NXP Semiconductors
Single-chip 16-bit/32-bit microcontrollers
Table 3.
Pin description LPC2158
Symbol
Pin
Type
Description
P0[0] to P0[31]
I/O
Port 0: Port 0 is a 32-bit I/O port with individual direction controls for each bit.
Total of 29 pins of the Port 0 can be used as a general purpose bidirectional
digital I/Os while P0[31] is output only pin. The operation of port 0 pins
depends upon the pin function selected via the pin connect block.
Pins P0[24], P0[26] and P0[27] are not available.
P0[0] — General purpose input/output digital pin (GPIO).
TXD0 — Transmitter output for UART0.
P0[0]/TXD0/
PWM1
7[1]
I/O
O
O
PWM1 — Pulse Width Modulator output 1.
P0[1]/RXD0/
PWM3/EINT0
9[2]
I/O
I
P0[1] — General purpose input/output digital pin (GPIO).
RXD0 — Receiver input for UART0.
O
PWM3 — Pulse Width Modulator output 3.
I
EINT0 — External interrupt 0 input.
P0[2]/SCL0/
CAP0[0]
10[3]
I/O
I/O
I
P0[2] — General purpose input/output digital pin (GPIO).
SCL0 — I2C0 clock input/output. Open-drain output (for I2C-bus compliance).
CAP0[0] — Capture input for Timer 0, channel 0.
P0[3] — General purpose input/output digital pin (GPIO).
SDA0 — I2C0 data input/output. Open-drain output (for I2C-bus compliance).
MAT0[0] — Match output for Timer 0, channel 0.
EINT1 — External interrupt 1 input.
P0[3]/SDA0/
MAT0[0]/EINT1
14[3]
I/O
I/O
O
I
P0[4]/SCK0/
CAP0[1]/AD0[6]
15[4]
I/O
I/O
I
P0[4] — General purpose input/output digital pin (GPIO).
SCK0 — Serial clock for SPI0. SPI clock output from master or input to slave.
CAP0[1] — Capture input for Timer 0, channel 1.
AD0[6] — ADC 0, input 6.
I
P0[5]/MISO0/
MAT0[1]/AD0[7]
17[4]
I/O
I/O
P0[5] — General purpose input/output digital pin (GPIO).
MISO0 — Master In Slave Out for SPI0. Data input to SPI master or data
output from SPI slave.
O
MAT0[1] — Match output for Timer 0, channel 1.
AD0[7] — ADC 0, input 7.
I
P0[6]/MOSI0/
CAP0[2]/AD1[0]
18[4]
I/O
I/O
P0[6] — General purpose input/output digital pin (GPIO).
MOSI0 — Master Out Slave In for SPI0. Data output from SPI master or data
input to SPI slave.
I
CAP0[2] — Capture input for Timer 0, channel 2.
AD1[0] — ADC 1, input 0.
I
P0[7]/SSEL0/
PWM2/EINT2
19[2]
I/O
I
P0[7] — General purpose input/output digital pin (GPIO).
SSEL0 — Slave Select for SPI0. Selects the SPI interface as a slave.
PWM2 — Pulse Width Modulator output 2.
EINT2 — External interrupt 2 input.
O
I
P0[8]/TXD1/
PWM4/AD1[1]
20[4]
I/O
O
O
I
P0[8] — General purpose input/output digital pin (GPIO).
TXD1 — Transmitter output for UART1.
PWM4 — Pulse Width Modulator output 4.
AD1[1] — ADC 1, input 1.
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Table 3.
Symbol
Pin description LPC2158 …continued
Pin
Type
Description
P0[9]/RXD1/
PWM6/EINT3
21[2]
I/O
I
P0[9] — General purpose input/output digital pin (GPIO).
RXD1 — Receiver input for UART1.
O
I
PWM6 — Pulse Width Modulator output 6.
EINT3 — External interrupt 3 input.
P0[10]/RTS1/
CAP1[0]/AD1[2]
22[4]
23[3]
24[4]
25[4]
26[3]
I/O
O
I
P0[10] — General purpose input/output digital pin (GPIO).
RTS1 — Request to Send output for UART1.
CAP1[0] — Capture input for Timer 1, channel 0.
AD1[2] — ADC 1, input 2.
I
P0[11]/CTS1/
CAP1[1]/SCL1
I/O
I
P0[11] — General purpose input/output digital pin (GPIO).
CTS1 — Clear to Send input for UART1.
I
CAP1[1] — Capture input for Timer 1, channel 1.
SCL1 — I2C1 clock input/output. Open-drain output (for I2C-bus compliance)
P0[12] — General purpose input/output digital pin (GPIO).
DSR1 — Data Set Ready input for UART1.
I/O
I/O
I
P0[12]/DSR1/
MAT1[0]/AD1[3]
O
I
MAT1[0] — Match output for Timer 1, channel 0.
AD1[3] — ADC 1 input 3.
P0[13]/DTR1/
MAT1[1]/AD1[4]
I/O
O
O
I
P0[13] — General purpose input/output digital pin (GPIO).
DTR1 — Data Terminal Ready output for UART1.
MAT1[1] — Match output for Timer 1, channel 1.
AD1[4] — ADC 1 input 4.
P0[14]/DCD1/
EINT1/SDA1
I/O
I
P0[14] — General purpose input/output digital pin (GPIO).
DCD1 — Data Carrier Detect input for UART1.
EINT1 — External interrupt 1 input.
I
I/O
SDA1 — I2C1 data input/output. Open-drain output (for I2C-bus compliance).
Note: LOW on this pin while RESET is LOW forces on-chip bootloader to take
over control of the part after reset.
P0[15]/RI1/
EINT2/AD1[5]
28[4]
29[2]
30[1]
I/O
P0[15] — General purpose input/output digital pin (GPIO).
RI1 — Ring Indicator input for UART1.
I
I
EINT2 — External interrupt 2 input.
I
AD1[5] — ADC 1, input 5.
P0[16]/EINT0/
MAT0[2]/CAP0[2]
I/O
I
P0[16] — General purpose input/output digital pin (GPIO).
EINT0 — External interrupt 0 input.
O
I
MAT0[2] — Match output for Timer 0, channel 2.
CAP0[2] — Capture input for Timer 0, channel 2.
P0[17] — General purpose input/output digital pin (GPIO).
CAP1[2] — Capture input for Timer 1, channel 2.
SCK1 — Serial Clock for SSP. Clock output from master or input to slave.
MAT1[2] — Match output for Timer 1, channel 2.
P0[17]/CAP1[2]/
SCK1/MAT1[2]
I/O
I
I/O
O
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Table 3.
Symbol
Pin description LPC2158 …continued
Pin
Type
I/O
I
Description
P0[18]/CAP1[3]/
MISO1/MAT1[3]
79[1]
P0[18] — General purpose input/output digital pin (GPIO).
CAP1[3] — Capture input for Timer 1, channel 3.
I/O
MISO1 — Master In Slave Out for SSP. Data input to SPI master or data output
from SSP slave.
O
MAT1[3] — Match output for Timer 1, channel 3.
P0[19] — General purpose input/output digital pin (GPIO).
MAT1[2] — Match output for Timer 1, channel 2.
P0[19]/MAT1[2]/
MOSI1/CAP1[2]
80[1]
I/O
O
I/O
MOSI1 — Master Out Slave In for SSP. Data output from SSP master or data
input to SSP slave.
I
CAP1[2] — Capture input for Timer 1, channel 2.
P0[20] — General purpose input/output digital pin (GPIO).
MAT1[3] — Match output for Timer 1, channel 3.
SSEL1 — Slave Select for SSP. Selects the SSP interface as a slave.
EINT3 — External interrupt 3 input.
P0[20]/MAT1[3]/
SSEL1/EINT3
81[2]
91[4]
92[4]
I/O
O
I
I
P0[21]/PWM5/
AD1[6]/CAP1[3]
I/O
P0[21] — General purpose input/output digital pin (GPIO).
PWM5 — Pulse Width Modulator output 5.
AD1[6] — ADC 1, input 6.
O
I
I
CAP1[3] — Capture input for Timer 1, channel 3.
P0[22] — General purpose input/output digital pin (GPIO).
AD1[7] — ADC 1, input 7.
P0[22]/AD1[7]/
CAP0[0]/
I/O
I
MAT0[0]
I
CAP0[0] — Capture input for Timer 0, channel 0.
MAT0[0] — Match output for Timer 0, channel 0.
P0[23] — General purpose input/output digital pin (GPIO).
VBUS — Indicates the presence of USB bus power.
Note: This signal must be HIGH for USB reset to occur.
P0[25] — General purpose input/output digital pin (GPIO).
AD0[4] — ADC 0, input 4.
O
I/O
I
P0[23]/VBUS
84[1]
97[5]
1[4]
P0[25]/AD0[4]/
AOUT
I/O
I
O
AOUT — DAC output.
P0[28]/AD0[1]/
CAP0[2]/MAT0[2]
I/O
P0[28] — General purpose input/output digital pin (GPIO).
AD0[1] — ADC 0, input 1.
I
I
CAP0[2] — Capture input for Timer 0, channel 2.
MAT0[2] — Match output for Timer 0, channel 2.
P0[29] — General purpose input/output digital pin (GPIO).
AD0[2] — ADC 0, input 2.
O
P0[29]/AD0[2]/
2[4]
I/O
CAP0[3]/MAT0[3]
I
I
CAP0[3] — Capture input for Timer 0, channel 3.
MAT0[3] — Match output for Timer 0, channel 3.
P0[30] — General purpose input/output digital pin (GPIO).
AD0[3] — ADC 0, input 3.
O
P0[30]/AD0[3]/
EINT3/CAP0[0]
3[4]
I/O
I
I
I
EINT3 — External interrupt 3 input.
CAP0[0] — Capture input for Timer 0, channel 0.
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Table 3.
Symbol
Pin description LPC2158 …continued
Pin
5[6]
Type
O
Description
P0[31]/UP_LED/
CONNECT
P0[31] — General purpose output only digital pin.
O
UP_LED — USB GoodLink LED indicator. It is LOW when device is configured
(non-control endpoints enabled). It is HIGH when the device is not configured
or during global suspend.
O
CONNECT — Signal used to switch an external 1.5 kΩ resistor under the
software control. Used with the SoftConnect USB feature.
Important: This is an digital output only pin. This pin MUST NOT be externally
pulled LOW when RESET pin is LOW or the JTAG port will be disabled.
P1[0] to P1[31]
I/O
Port 1: Port 1 is a 32-bit bidirectional I/O port with individual direction controls
for each bit. The operation of port 1 pins depends upon the pin function
selected via the pin connect block. Pins 0 through 15 and 18 through 24 of
port 1 are not available.
P1[16]
4[6]
100[6]
16[6]
I/O
I/O
I/O
I
P1[16] — General purpose input/output digital pin (GPIO).
P1[17] — General purpose input/output digital pin (GPIO).
P1[25] — General purpose input/output digital pin (GPIO).
EXTIN0 — External Trigger Input. Standard I/O with internal pull-up.
P1[26] — General purpose input/output digital pin (GPIO).
P1[17]
P1[25]/EXTIN0
P1[26]/RTCK
12[6]
I/O
I/O
RTCK — Returned Test Clock output. Extra signal added to the JTAG port.
Assists debugger synchronization when processor frequency varies.
Bidirectional pin with internal pull-up.
Note: LOW on RTCK while RESET is LOW enables pins P1[31:26] to operate
as Debug port after reset.
P1[27]/TDO
P1[28]/TDI
P1[29]/TCK
P1[30]/TMS
P1[31]/TRST
90[6]
86[6]
82[6]
78[6]
8[6]
I/O
O
P1[27] — General purpose input/output digital pin (GPIO).
TDO — Test Data out for JTAG interface.
I/O
I
P1[28] — General purpose input/output digital pin (GPIO).
TDI — Test Data in for JTAG interface.
I/O
I
P1[29] — General purpose input/output digital pin (GPIO).
TCK — Test Clock for JTAG interface.
I/O
I
P1[30] — General purpose input/output digital pin (GPIO).
TMS — Test Mode Select for JTAG interface.
P1[31] — General purpose input/output digital pin (GPIO).
TRST — Test Reset for JTAG interface.
I/O
I
D+
98[7]
99[7]
83[8]
I/O
I/O
I
USB bidirectional D+ line.
D−
USB bidirectional D− line.
RESET
External reset input: A LOW on this pin resets the device, causing I/O ports
and peripherals to take on their default states, and processor execution to
begin at address 0. TTL with hysteresis, 5 V tolerant.
XTAL1
XTAL2
RTCX1
RTCX2
VSS
88[9]
87[9]
93[9]
94[9]
O
I
Input from the oscillator amplifier.
Output to the oscillator circuit and internal clock generator circuits.
Input to the RTC oscillator circuit.
I
O
I
Output from the RTC oscillator circuit.
Ground: 0 V reference.
6, 13, 32,
39, 40,
85, 95
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Table 3.
Symbol
VDD
Pin description LPC2158 …continued
Pin Type Description
11, 27, 33 I
3.3 V power supply: This is the power supply voltage for the core and I/O
ports.
VDDA
96
I
Analog 3.3 V power supply: This should be nominally the same voltage as
VDD but should be isolated to minimize noise and error. This voltage is only
used to power the on-chip ADC(s) and DAC.
VDD(LCD)
VLCD
38
41
89
I
I
I
1.8 V to 5.5 V power supply: Power supply voltage for the PCF8576D.
LCD power supply: LCD voltage.
VREF
ADC reference voltage: This should be nominally less than or equal to the
VDD voltage but should be isolated to minimize noise and error. Level on this
pin is used as a reference for ADC(s) and DAC.
VBAT
31
I
RTC power supply voltage: 3.3 V on this pin supplies the power to the RTC.
SDA LCD — I2C-bus data signal for the LCD controller.
SCL LCD — I2C-bus clock signal for the LCD controller.
SYNC — cascade synchronization input/output
CLK — external clock input/output
SDA_LCD
SCL_LCD
SYNC
34
I/O
I
35
36
I/O
I/O
O
CLK
37
BP0 to BP3
S0 to S31
42 to 45
46 to 77
BP0 to BP3: LCD backplane outputs.
O
S0 to S31: LCD segment outputs.
[1] 5 V tolerant pad providing digital I/O functions with TTL levels and hysteresis and 10 ns slew rate control.
[2] 5 V tolerant pad providing digital I/O functions with TTL levels and hysteresis and 10 ns slew rate control. If configured for an input
function, this pad utilizes built-in glitch filter that blocks pulses shorter than 3 ns.
[3] Open-drain 5 V tolerant digital I/O I2C-bus 400 kHz specification compatible pad. It requires external pull-up to provide an output
functionality.
[4] 5 V tolerant pad providing digital I/O (with TTL levels and hysteresis and 10 ns slew rate control) and analog input function. If configured
for an input function, this pad utilizes built-in glitch filter that blocks pulses shorter than 3 ns. When configured as an ADC input, digital
section of the pad is disabled.
[5] 5 V tolerant pad providing digital I/O (with TTL levels and hysteresis and 10 ns slew rate control) and analog output function. When
configured as the DAC output, digital section of the pad is disabled.
[6] 5 V tolerant pad with built-in pull-up resistor providing digital I/O functions with TTL levels and hysteresis and 10 ns slew rate control.
The pull-up resistor’s value typically ranges from 60 kΩ to 300 kΩ.
[7] Pad is designed in accordance with the Universal Serial Bus (USB) specification, revision 2.0 (Full-speed and Low-speed mode only).
[8] 5 V tolerant pad providing digital input (with TTL levels and hysteresis) function only.
[9] Pad provides special analog functionality.
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6. Functional description
6.1 Architectural overview
The ARM7TDMI-S is a general purpose 32-bit microprocessor, which offers high
performance and very low power consumption. The ARM architecture is based on
Reduced Instruction Set Computer (RISC) principles, and the instruction set and related
decode mechanism are much simpler than those of microprogrammed Complex
Instruction Set Computers (CISC). This simplicity results in a high instruction throughput
and impressive real-time interrupt response from a small and cost-effective processor
core.
Pipeline techniques are employed so that all parts of the processing and memory systems
can operate continuously. Typically, while one instruction is being executed, its successor
is being decoded, and a third instruction is being fetched from memory.
The ARM7TDMI-S processor also employs a unique architectural strategy known as
Thumb, which makes it ideally suited to high-volume applications with memory
restrictions, or applications where code density is an issue.
The key idea behind Thumb is that of a super-reduced instruction set. Essentially, the
ARM7TDMI-S processor has two instruction sets:
• The standard 32-bit ARM set.
• A 16-bit Thumb set.
The Thumb set’s 16-bit instruction length allows it to approach twice the density of
standard ARM code while retaining most of the ARM’s performance advantage over a
traditional 16-bit processor using 16-bit registers. This is possible because Thumb code
operates on the same 32-bit register set as ARM code.
Thumb code is able to provide up to 65 % of the code size of ARM, and 160 % of the
performance of an equivalent ARM processor connected to a 16-bit memory system.
6.2 On-chip flash program memory
The LPC2157/2158 incorporate a 512 kB flash memory system. This memory may be
used for both code and data storage. Programming of the flash memory may be
accomplished in several ways. It may be programmed In System via the serial port. The
application program may also erase and/or program the flash while the application is
running, allowing a great degree of flexibility for data storage field firmware upgrades, etc.
Due to the architectural solution chosen for an on-chip bootloader, flash memory available
for user’s code on LPC2157/2158 is 500 kB respectively.
The LPC2157/2158 flash memory provides a minimum of 400000 erase/write cycles and
20 years of data-retention.
6.3 On-chip static RAM
On-chip static RAM may be used for code and/or data storage. The SRAM may be
accessed as 8-bit, 16-bit, and 32-bit. The LPC2157/2158 provide 32 kB and 40 kB of
static RAM.
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In case of LPC2158 only, an 8 kB SRAM block intended to be utilized mainly by the USB
can also be used as a general purpose RAM for data storage and code storage and
execution.
6.4 Memory map
The LPC2157/2158 memory map incorporates several distinct regions, as shown in
Figure 6.
In addition, the CPU interrupt vectors may be remapped to allow them to reside in either
flash memory (the default) or on-chip static RAM. This is described in Section 6.19
“System control”.
4.0 GB
0xFFFF FFFF
AHB PERIPHERALS
0xF000 0000
0xE000 0000
3.75 GB
3.5 GB
APB PERIPHERALS
0xC000 0000
3.0 GB
RESERVED ADDRESS SPACE
0x8000 0000
0x7FFF FFFF
2.0 GB
BOOT BLOCK (RE-MAPPED FROM
ON-CHIP FLASH MEMORY
0x7FFF D000
0x7FFF CFFF
RESERVED ADDRESS SPACE
0x4001 8000
0x4000 7FFF
32 kB ON-CHIP STATIC RAM (LPC2157/2158)
RESERVED ADDRESS SPACE
0x4000 4000
1.0 GB
0.0 GB
0x0008 0000
0x0007 FFFF
512 kB ON-CHIP NON-VOLATILE MEMORY
(LPC2157/2158)
0x0001 0000
002aad402
Fig 6. LPC2157/2158 memory map
6.5 Interrupt controller
The Vectored Interrupt Controller (VIC) accepts all of the interrupt request inputs and
categorizes them as Fast Interrupt Request (FIQ), vectored Interrupt Request (IRQ), and
non-vectored IRQ as defined by programmable settings. The programmable assignment
scheme means that priorities of interrupts from the various peripherals can be dynamically
assigned and adjusted.
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FIQ has the highest priority. If more than one request is assigned to FIQ, the VIC
combines the requests to produce the FIQ signal to the ARM processor. The fastest
possible FIQ latency is achieved when only one request is classified as FIQ, because then
the FIQ service routine does not need to branch into the interrupt service routine but can
run from the interrupt vector location. If more than one request is assigned to the FIQ
class, the FIQ service routine will read a word from the VIC that identifies which FIQ
source(s) is (are) requesting an interrupt.
Vectored IRQs have the middle priority. Sixteen of the interrupt requests can be assigned
to this category. Any of the interrupt requests can be assigned to any of the 16 vectored
IRQ slots, among which slot 0 has the highest priority and slot 15 has the lowest.
Non-vectored IRQs have the lowest priority.
The VIC combines the requests from all the vectored and non-vectored IRQs to produce
the IRQ signal to the ARM processor. The IRQ service routine can start by reading a
register from the VIC and jumping there. If any of the vectored IRQs are pending, the VIC
provides the address of the highest-priority requesting IRQs service routine, otherwise it
provides the address of a default routine that is shared by all the non-vectored IRQs. The
default routine can read another VIC register to see what IRQs are active.
6.5.1 Interrupt sources
Each peripheral device has one interrupt line connected to the Vectored Interrupt
Controller, but may have several internal interrupt flags. Individual interrupt flags may also
represent more than one interrupt source.
6.6 Pin connect block
The pin connect block allows selected pins of the microcontroller to have more than one
function. Configuration registers control the multiplexers to allow connection between the
pin and the on chip peripherals. Peripherals should be connected to the appropriate pins
prior to being activated, and prior to any related interrupt(s) being enabled. Activity of any
enabled peripheral function that is not mapped to a related pin should be considered
undefined.
The Pin Control Module with its pin select registers defines the functionality of the
microcontroller in a given hardware environment.
After reset all pins of Port 0 and Port 1 are configured as input with the following
exceptions: If debug is enabled, the JTAG pins will assume their JTAG functionality. The
pins associated with the I2C0 and I2C1 interface are open drain.
6.7 Fast general purpose parallel I/O
Device pins that are not connected to a specific peripheral function are controlled by the
GPIO registers. Pins may be dynamically configured as inputs or outputs. Separate
registers allow setting or clearing any number of outputs simultaneously. The value of the
output register may be read back, as well as the current state of the port pins.
LPC2157/2158 introduce accelerated GPIO functions over prior LPC2000 devices:
• GPIO registers are relocated to the ARM local bus for the fastest possible I/O timing.
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• Mask registers allow treating sets of port bits as a group, leaving other bits
unchanged.
• All GPIO registers are byte addressable.
• Entire port value can be written in one instruction.
6.7.1 Features
• Bit-level set and clear registers allow a single instruction set or clear of any number of
bits in one port.
• Direction control of individual bits.
• Separate control of output set and clear.
• All I/O default to inputs after reset.
6.8 10-bit ADC
The LPC2157/2158 contain two single 10-bit successive approximation ADCs. While
ADC0 has eight channels (six channels for LPC2158), ADC1 has eight channels.
Therefore, the total number of available ADC inputs for LPC2157 is 16 and for LPC2158 is
14.
6.8.1 Features
• 10-bit successive approximation ADC.
• Measurement range of 0 V to VREF (2.0 V ≤ VREF ≤ VDDA).
• Each converter capable of performing more than 400000 10-bit samples per second.
• Every analog input has a dedicated result register to reduce interrupt overhead.
• Burst conversion mode for single or multiple inputs.
• Optional conversion on transition on input pin or timer match signal.
• Global Start command for both converters.
6.9 10-bit DAC
The DAC enables the LPC2157/2158 to generate a variable analog output. The maximum
DAC output voltage is the VREF voltage.
6.9.1 Features
• 10-bit DAC.
• Buffered output.
• Power-down mode available.
• Selectable speed versus power.
6.10 USB 2.0 device controller (LPC2158 only)
The USB is a 4-wire serial bus that supports communication between a host and a
number (127 max) of peripherals. The host controller allocates the USB bandwidth to
attached devices through a token based protocol. The bus supports hot plugging,
unplugging, and dynamic configuration of the devices. All transactions are initiated by the
host controller.
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The LPC2158 is equipped with a USB device controller that enables 12 Mbit/s data
exchange with a USB host controller. It consists of a register interface, serial interface
engine, endpoint buffer memory and DMA controller. The serial interface engine decodes
the USB data stream and writes data to the appropriate end point buffer memory. The
status of a completed USB transfer or error condition is indicated via status registers. An
interrupt is also generated if enabled.
A DMA controller can transfer data between an endpoint buffer and the USB RAM.
6.10.1 Features
• Fully compliant with USB 2.0 Full-speed specification.
• Supports 32 physical (16 logical) endpoints.
• Supports control, bulk, interrupt and isochronous endpoints.
• Scalable realization of endpoints at run time.
• Endpoint maximum packet size selection (up to USB maximum specification) by
software at run time.
• RAM message buffer size based on endpoint realization and maximum packet size.
• Supports SoftConnect and GoodLink LED indicator. These two functions are sharing
one pin.
• Supports bus-powered capability with low suspend current.
• Supports DMA transfer on all non-control endpoints.
• One duplex DMA channel serves all endpoints.
• Allows dynamic switching between CPU controlled and DMA modes.
• Double buffer implementation for bulk and isochronous endpoints.
6.11 UARTs
The LPC2157/2158 each contain two UARTs. In addition to standard transmit and receive
data lines, the UART1 also provides a full modem control handshake interface.
Compared to previous LPC2000 microcontrollers, UARTs in LPC2157/2158 introduce a
fractional baud rate generator for both UARTs, enabling these microcontrollers to achieve
standard baud rates such as 115200 Bd with any crystal frequency above 2 MHz. In
addition, auto-CTS/RTS flow-control functions are fully implemented in hardware.
6.11.1 Features
• 16 B Receive and Transmit FIFOs.
• Register locations conform to 16C550 industry standard.
• Receiver FIFO trigger points at 1 B, 4 B, 8 B and 14 B
• Built-in fractional baud rate generator covering wide range of baud rates without a
need for external crystals of particular values.
• Transmission FIFO control enables implementation of software (XON/XOFF) flow
control on both UARTs.
• LPC2158 UART1 equipped with standard modem interface signals. This module also
provides full support for hardware flow control (auto-CTS/RTS).
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6.12 I2C-bus serial I/O controller
The LPC2157/2158 each contain two I2C-bus controllers.
The I2C-bus is bidirectional, for inter-IC control using only two wires: a serial clock line
(SCL), and a serial data line (SDA). Each device is recognized by a unique address and
can operate as either a receiver-only device (e.g., an LCD driver or a transmitter with the
capability to both receive and send information (such as memory)). Transmitters and/or
receivers can operate in either master or slave mode, depending on whether the chip has
to initiate a data transfer or is only addressed. The I2C-bus is a multi-master bus, it can be
controlled by more than one bus master connected to it.
The I2C-bus implemented in LPC2157/2158 supports bit rates up to 400 kbit/s (Fast
I2C-bus).
6.12.1 Features
• Compliant with standard I2C-bus interface.
• Easy to configure as master, slave, or master/slave.
• Programmable clocks allow versatile rate control.
• Bidirectional data transfer between masters and slaves.
• Multi-master bus (no central master).
• Arbitration between simultaneously transmitting masters without corruption of serial
data on the bus.
• Serial clock synchronization allows devices with different bit rates to communicate via
one serial bus.
• Serial clock synchronization can be used as a handshake mechanism to suspend and
resume serial transfer.
• The I2C-bus can be used for test and diagnostic purposes.
6.13 SPI serial I/O controller
The LPC2157/2158 each contain one SPI controller. The SPI is a full duplex serial
interface, designed to handle multiple masters and slaves connected to a given bus. Only
a single master and a single slave can communicate on the interface during a given data
transfer. During a data transfer the master always sends a byte of data to the slave, and
the slave always sends a byte of data to the master.
6.13.1 Features
• Compliant with SPI specification.
• Synchronous, Serial, Full Duplex, Communication.
• Combined SPI master and slave.
• Maximum data bit rate of one eighth of the input clock rate.
6.14 SSP serial I/O controller
The LPC2157/2158 each contain one Serial Synchronous Port controller (SSP). The SSP
controller is capable of operation on a SPI, 4-wire SSI, or Microwire bus. It can interact
with multiple masters and slaves on the bus. However, only a single master and a single
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slave can communicate on the bus during a given data transfer. The SSP supports full
duplex transfers, with data frames of 4 bits to 16 bits of data flowing from the master to the
slave and from the slave to the master. Often only one of these data flows carries
meaningful data.
6.14.1 Features
• Compatible with Motorola’s SPI, TI’s 4-wire SSI and National Semiconductor’s
Microwire buses.
• Synchronous serial communication.
• Master or slave operation.
• 8-frame FIFOs for both transmit and receive.
• Four bits to 16 bits per frame.
6.15 General purpose timers/external event counters
The Timer/Counter is designed to count cycles of the peripheral clock (PCLK) or an
externally supplied clock and optionally generate interrupts or perform other actions at
specified timer values, based on four match registers. It also includes four capture inputs
to trap the timer value when an input signal transitions, optionally generating an interrupt.
Multiple pins can be selected to perform a single capture or match function, providing an
application with ‘or’ and ‘and’, as well as ‘broadcast’ functions among them.
The LPC2157/2158 can count external events on one of the capture inputs if the minimum
external pulse is equal or longer than a period of the PCLK. In this configuration, unused
capture lines can be selected as regular timer capture inputs, or used as external
interrupts.
6.15.1 Features
• A 32-bit timer/counter with a programmable 32-bit prescaler.
• External event counter or timer operation.
• Four 32-bit capture channels per timer/counter that can take a snapshot of the timer
value when an input signal transitions. A capture event may also optionally generate
an interrupt.
• Four 32-bit match registers that allow:
– Continuous operation with optional interrupt generation on match.
– Stop timer on match with optional interrupt generation.
– Reset timer on match with optional interrupt generation.
• Four external outputs per timer/counter corresponding to match registers, with the
following capabilities:
– Set LOW on match.
– Set HIGH on match.
– Toggle on match.
– Do nothing on match.
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6.16 Watchdog timer
The purpose of the watchdog is to reset the microcontroller within a reasonable amount of
time if it enters an erroneous state. When enabled, the watchdog will generate a system
reset if the user program fails to ‘feed’ (or reload) the watchdog within a predetermined
amount of time.
6.16.1 Features
• Internally resets chip if not periodically reloaded.
• Debug mode.
• Enabled by software but requires a hardware reset or a watchdog reset/interrupt to be
disabled.
• Incorrect/Incomplete feed sequence causes reset/interrupt if enabled.
• Flag to indicate watchdog reset.
• Programmable 32-bit timer with internal prescaler.
• Selectable time period from (Tcy(PCLK) × 256 × 4) to (Tcy(PCLK) × 232 × 4) in multiples of
T
cy(PCLK) × 4.
6.17 Real-time clock
The RTC is designed to provide a set of counters to measure time when normal or idle
operating mode is selected. The RTC has been designed to use little power, making it
suitable for battery powered systems where the CPU is not running continuously (Idle
mode).
6.17.1 Features
• Measures the passage of time to maintain a calendar and clock.
• Ultra-low power design to support battery powered systems.
• Provides Seconds, Minutes, Hours, Day of Month, Month, Year, Day of Week, and Day
of Year.
• Can use either the RTC dedicated 32 kHz oscillator input or clock derived from the
external crystal/oscillator input at XTAL1. Programmable reference clock divider
allows fine adjustment of the RTC.
• Dedicated power supply pin can be connected to a battery or the main 3.3 V.
6.18 Pulse width modulator
The PWM is based on the standard timer block and inherits all of its features, although
only the PWM function is pinned out on the LPC2157/2158. The timer is designed to count
cycles of the peripheral clock (PCLK) and optionally generate interrupts or perform other
actions when specified timer values occur, based on seven match registers. The PWM
function is also based on match register events.
The ability to separately control rising and falling edge locations allows the PWM to be
used for more applications. For instance, multi-phase motor control typically requires three
non-overlapping PWM outputs with individual control of all three pulse widths and
positions.
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Two match registers can be used to provide a single edge controlled PWM output. One
match register (MR0) controls the PWM cycle rate, by resetting the count upon match.
The other match register controls the PWM edge position. Additional single edge
controlled PWM outputs require only one match register each, since the repetition rate is
the same for all PWM outputs. Multiple single edge controlled PWM outputs will all have a
rising edge at the beginning of each PWM cycle, when an MR0 match occurs.
Three match registers can be used to provide a PWM output with both edges controlled.
Again, the MR0 match register controls the PWM cycle rate. The other match registers
control the two PWM edge positions. Additional double edge controlled PWM outputs
require only two match registers each, since the repetition rate is the same for all PWM
outputs.
With double edge controlled PWM outputs, specific match registers control the rising and
falling edge of the output. This allows both positive going PWM pulses (when the rising
edge occurs prior to the falling edge), and negative going PWM pulses (when the falling
edge occurs prior to the rising edge).
6.18.1 Features
• Seven match registers allow up to six single edge controlled or three double edge
controlled PWM outputs, or a mix of both types.
• The match registers also allow:
– Continuous operation with optional interrupt generation on match.
– Stop timer on match with optional interrupt generation.
– Reset timer on match with optional interrupt generation.
• Supports single edge controlled and/or double edge controlled PWM outputs. Single
edge controlled PWM outputs all go HIGH at the beginning of each cycle unless the
output is a constant LOW. Double edge controlled PWM outputs can have either edge
occur at any position within a cycle. This allows for both positive going and negative
going pulses.
• Pulse period and width can be any number of timer counts. This allows complete
flexibility in the trade-off between resolution and repetition rate. All PWM outputs will
occur at the same repetition rate.
• Double edge controlled PWM outputs can be programmed to be either positive going
or negative going pulses.
• Match register updates are synchronized with pulse outputs to prevent generation of
erroneous pulses. Software must ‘release’ new match values before they can become
effective.
• May be used as a standard timer if the PWM mode is not enabled.
• A 32-bit Timer/Counter with a programmable 32-bit prescaler.
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6.19 System control
6.19.1 Crystal oscillator
On-chip integrated oscillator operates with external crystal in range of 1 MHz to 25 MHz.
The oscillator output frequency is called fosc and the ARM processor clock frequency is
referred to as CCLK for purposes of rate equations, etc. fosc and CCLK are the same value
unless the PLL is running and connected. Refer to Section 6.19.2 “PLL” for additional
information.
6.19.2 PLL
The PLL accepts an input clock frequency in the range of 10 MHz to 25 MHz. The input
frequency is multiplied up into the range of 10 MHz to 60 MHz with a Current Controlled
Oscillator (CCO). The multiplier can be an integer value from 1 to 32 (in practice, the
multiplier value cannot be higher than 6 on this family of microcontrollers due to the upper
frequency limit of the CPU). The CCO operates in the range of 156 MHz to 320 MHz, so
there is an additional divider in the loop to keep the CCO within its frequency range while
the PLL is providing the desired output frequency. The output divider may be set to divide
by 2, 4, 8 or 16 to produce the output clock. Since the minimum output divider value is 2, it
is insured that the PLL output has a 50 % duty cycle. The PLL is turned off and bypassed
following a chip reset and may be enabled by software. The program must configure and
activate the PLL, wait for the PLL to Lock, then connect to the PLL as a clock source. The
PLL settling time is 100 µs.
6.19.3 Reset and wake-up timer
Reset has two sources on the LPC2157/2158: the RESET pin and watchdog reset. The
RESET pin is a Schmitt trigger input pin with an additional glitch filter. Assertion of chip
reset by any source starts the Wake-up Timer (see Wake-up Timer description below),
causing the internal chip reset to remain asserted until the external reset is de-asserted,
the oscillator is running, a fixed number of clocks have passed, and the on-chip flash
controller has completed its initialization.
When the internal reset is removed, the processor begins executing at address 0, which is
the reset vector. At that point, all of the processor and peripheral registers have been
initialized to predetermined values.
The Wake-up Timer ensures that the oscillator and other analog functions required for
chip operation are fully functional before the processor is allowed to execute instructions.
This is important at power on, all types of reset, and whenever any of the aforementioned
functions are turned off for any reason. Since the oscillator and other functions are turned
off during Power-down mode, any wake-up of the processor from Power-down mode
makes use of the Wake-up Timer.
The Wake-up Timer monitors the crystal oscillator as the means of checking whether it is
safe to begin code execution. When power is applied to the chip, or some event caused
the chip to exit Power-down mode, some time is required for the oscillator to produce a
signal of sufficient amplitude to drive the clock logic. The amount of time depends on
many factors, including the rate of VDD ramp (in the case of power on), the type of crystal
and its electrical characteristics (if a quartz crystal is used), as well as any other external
circuitry (e.g. capacitors), and the characteristics of the oscillator itself under the existing
ambient conditions.
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6.19.4 Brownout detector
The LPC2157/2158 include 2-stage monitoring of the voltage on the VDD pins. If this
voltage falls below 2.9 V, the BOD asserts an interrupt signal to the VIC. This signal can
be enabled for interrupt; if not, software can monitor the signal by reading dedicated
register.
The second stage of low voltage detection asserts reset to inactivate the LPC2157/2158
when the voltage on the VDD pins falls below 2.6 V. This reset prevents alteration of the
flash as operation of the various elements of the chip would otherwise become unreliable
due to low voltage. The BOD circuit maintains this reset down below 1 V, at which point
the POR circuitry maintains the overall reset.
Both the 2.9 V and 2.6 V thresholds include some hysteresis. In normal operation, this
hysteresis allows the 2.9 V detection to reliably interrupt, or a regularly-executed event
loop to sense the condition.
6.19.5 Code security
This feature of the LPC2157/2158 allow an application to control whether it can be
debugged or protected from observation.
If after reset on-chip bootloader detects a valid checksum in flash and reads 0x8765 4321
from address 0x1FC in flash, debugging will be disabled and thus the code in flash will be
protected from observation. Once debugging is disabled, it can be enabled only by
performing a full chip erase using the ISP.
6.19.6 External interrupt inputs
The LPC2157/2158 include up to nine edge or level sensitive external interrupt inputs as
selectable pin functions. When the pins are combined, external events can be processed
as four independent interrupt signals. The external interrupt inputs can optionally be used
to wake-up the processor from Power-down mode.
Additionally capture input pins can also be used as external interrupts without the option
to wake the device up from Power-down mode.
6.19.7 Memory mapping control
The Memory Mapping Control alters the mapping of the interrupt vectors that appear
beginning at address 0x0000 0000. Vectors may be mapped to the bottom of the on-chip
flash memory, or to the on-chip static RAM. This allows code running in different memory
spaces to have control of the interrupts.
6.19.8 Power control
The LPC2157/2158 supports two reduced power modes: Idle mode and Power-down
mode.
In Idle mode, execution of instructions is suspended until either a reset or interrupt occurs.
Peripheral functions continue operation during Idle mode and may generate interrupts to
cause the processor to resume execution. Idle mode eliminates power used by the
processor itself, memory systems and related controllers, and internal buses.
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In Power-down mode, the oscillator is shut down and the chip receives no internal clocks.
The processor state and registers, peripheral registers, and internal SRAM values are
preserved throughout Power-down mode and the logic levels of chip output pins remain
static. The Power-down mode can be terminated and normal operation resumed by either
a reset or certain specific interrupts that are able to function without clocks. Since all
dynamic operation of the chip is suspended, Power-down mode reduces chip power
consumption to nearly zero.
Selecting an external 32 kHz clock instead of the PCLK as a clock-source for the on-chip
RTC will enable the microcontroller to have the RTC active during Power-down mode.
Power-down current is increased with RTC active. However, it is significantly lower than in
Idle mode.
A Power Control for Peripherals feature allows individual peripherals to be turned off if
they are not needed in the application, resulting in additional power savings during active
and Idle mode.
6.19.9 APB bus
The APB divider determines the relationship between the processor clock (CCLK) and the
clock used by peripheral devices (PCLK). The APB divider serves two purposes. The first
is to provide peripherals with the desired PCLK via APB bus so that they can operate at
the speed chosen for the ARM processor. In order to achieve this, the APB bus may be
slowed down to 1⁄2 to 1⁄4 of the processor clock rate. Because the APB bus must work
properly at power-up (and its timing cannot be altered if it does not work since the APB
divider control registers reside on the APB bus), the default condition at reset is for the
APB bus to run at 1⁄4 of the processor clock rate. The second purpose of the APB divider
is to allow power savings when an application does not require any peripherals to run at
the full processor rate. Because the APB divider is connected to the PLL output, the PLL
remains active (if it was running) during Idle mode.
6.20 Emulation and debugging
The LPC2157/2158 supports emulation and debugging via a JTAG serial port. Debugging
functions are multiplexed with GPIOs on Port 1. This means that all communication, timer
and interface peripherals residing on Port 0 are available during the development and
debugging phase as they are when the application is run in the embedded system itself.
6.20.1 EmbeddedICE
Standard ARM EmbeddedICE logic provides on-chip debug support. The debugging of
the target system requires a host computer running the debugger software and an
EmbeddedICE protocol convertor. EmbeddedICE protocol convertor converts the remote
debug protocol commands to the JTAG data needed to access the ARM core.
The ARM core has a Debug Communications Channel (DCC) function built-in. The DCC
allows a program running on the target to communicate with the host debugger or another
separate host without stopping the program flow or even entering the debug state. The
DCC is accessed as a co-processor 14 by the program running on the ARM7TDMI-S
core. The DCC allows the JTAG port to be used for sending and receiving data without
affecting the normal program flow. The DCC data and control registers are mapped in to
addresses in the EmbeddedICE logic.
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6.20.2 RealMonitor
RealMonitor is a configurable software module, developed by ARM Inc., which enables
real-time debug. It is a lightweight debug monitor that runs in the background while users
debug their foreground application. It communicates with the host using the DCC, which is
present in the EmbeddedICE logic. The LPC2157/2158 contain a specific configuration of
RealMonitor software programmed into the on-chip flash memory.
6.21 LCD driver
6.21.1 General description
The LCD segment driver in the LPC2157/2158 can interface to most LCDs using low
multiplex rates. It generates the drive signals for static or multiplexed LCDs containing up
to four backplanes and up to 32 segments. The LCD controller communicates to a host
using the I2C-bus. The I2C-bus clock and data signals for both the microcontroller and the
LCD driver are available on the LPC2157/2158 providing system flexibility.
Communication overhead to manage the display is minimized by an on-chip display RAM
with auto-increment addressing, hardware subaddressing, and display memory switching
(static and duplex drive modes). Please refer to PCF8576D data sheet for electrical data.
6.21.2 Functional description
The LCD controller is a versatile peripheral device designed to interface microcontrollers
to a wide variety of LCDs. It can directly drive any static or multiplexed LCD containing up
to four backplanes and up to 32 segments. The display configurations possible with the
LCD controller depend on the number of active backplane outputs required. A selection of
display configurations is shown in Table 4. All of these configurations can be implemented
in a typical system.
The microcontroller communicates to the LCD controller using the I2C-bus.The
appropriate biasing voltages for the multiplexed LCD waveforms are generated internally.
The only other connections required to complete the system are to the power supplies
(VDD(LCD), VSS and VLCD) and the LCD panel chosen for the application.
Table 4.
Selection of display configurations
7-segments numeric
Number of
14-segments alphanumeric
Dot matrix
Backplanes
Segments
Digits
Indicator
symbols
Characters
Indicator
symbols
4
3
2
1
128
96
16
12
8
16
12
8
8
6
4
2
16
12
8
128
96
64
64
32
4
4
4
32
6.21.3 LCD bias voltages
LCD biasing voltages are obtained from an internal voltage divider consisting of three
series resistors connected between VLCD and VSS. The LCD voltage can be temperature
compensated externally via the supply to pin VLCD. A voltage selector drives the
multiplexing of the LCD based on programmable configurations.
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6.21.4 Oscillator
6.21.4.1 Internal clock
An internal oscillator provides the clock signals for the internal logic of the LCD controller
and its LCD drive signals. After power-up, pin SDA must be HIGH to guarantee that the
clock starts.
6.21.5 Timing
The LCD controller timing controls the internal data flow of the device. This includes the
transfer of display data from the display RAM to the display segment outputs. The timing
also generates the LCD frame signal whose frequency is derived from the clock
frequency. The frame signal frequency is a fixed division of the clock frequency from either
the internal or an external clock.
Frame frequency = fosc(ctrl)LCD/24.
6.21.6 Display register
A display latch holds the display data while the corresponding multiplex signals are
generated. There is a one-to-one relationship between the data in the display latch, the
LCD segment outputs, and each column of the display RAM.
6.21.7 Segment outputs
The LCD drive section includes 32 segment outputs S0 to S31. The segment output
signals are generated according to the multiplexed backplane signals and the display
latch data. When less than 32 segment outputs are required, the unused segment outputs
should be left open-circuit.
6.21.8 Backplane outputs
The LCD drive section has four backplane outputs BP0 to BP3. The backplane output
signals are generated in accordance with the selected LCD drive mode. If less than four
backplane outputs are required, the unused outputs can be left open-circuit. In the 1:3
multiplex drive mode, BP3 carries the same signal as BP1, therefore these two adjacent
outputs can be tied together to give enhanced drive capabilities. In the 1:2 multiplex drive
mode, BP0 and BP2, BP1 and BP3 respectively carry the same signals and may also be
paired to increase the drive capabilities. In the static drive mode the same signal is carried
by all four backplane outputs and they can be connected in parallel for very high drive
requirements.
6.21.9 Display RAM
The display RAM is a static 32 × 4-bit RAM which stores LCD data. There is a one-to-one
correspondence between the RAM addresses and the segment outputs, and between the
individual bits of a RAM word and the backplane outputs. The first RAM column
corresponds to the 32 segments for backplane 0 (BP0). In multiplexed LCD applications
the segment data of the second, third and fourth column of the display RAM are
time-multiplexed with BP1, BP2 and BP3 respectively.
6.21.10 Data pointer
The Display RAM is addressed using the data pointer. Either a single byte or a series of
display bytes may be loaded into any location of the display RAM.
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6.21.11 Output bank selector
The LCD controller includes a RAM bank switching feature in the static and 1:2 drive
modes. In the static drive mode, the BANK SELECT command may request the contents
of bit 2 to be selected for display instead of the contents of bit 0. In 1:2 mode, the contents
of bits 2 and 3 may be selected instead of bits 0 and 1. This allows display information to
be prepared in an alternative bank and then selected for display when it is assembled.
6.21.12 Input bank selector
The input bank selector loads display data into the display RAM based on the selected
LCD drive configuration. The BANK SELECT command can be used to load display data
in bit 2 in static drive mode or in bits 2 and 3 in 1:2 mode. The input bank selector
functions are independent of the output bank selector.
6.21.13 Blinker
The LCD controller has a very versatile display blinking capability. The whole display can
blink at a frequency selected by the BLINK command. Each blink frequency is a multiple
integer value of the clock frequency; the ratio between the clock frequency and blink
frequency depends on the blink mode selected, as shown in Table 5.
An additional feature allows an arbitrary selection of LCD segments to be blinked in the
static and 1:2 drive modes. This is implemented without any communication overheads by
the output bank selector which alternates the displayed data between the data in the
display RAM bank and the data in an alternative RAM bank at the blink frequency. This
mode can also be implemented by the BLINK command.
The entire display can be blinked at a frequency other than the nominal blink frequency by
sequentially resetting and setting the display enable bit E at the required rate using the
MODE SET command.
Table 5.
Blink mode
Off
Blinking frequencies
Normal operating mode ratio Normal blink frequency
-
blinking off
2 Hz
fosc(ctrl)LCD/768
fosc(ctrl)LCD/1536
fosc(ctrl)LCD/3072
2 Hz
1 Hz
1 Hz
0.5 Hz
0.5 Hz
Blink modes 0.5 Hz, 1 Hz and 2 Hz, and nominal blink frequencies 0.5 Hz, 1 Hz and 2 Hz
correspond to an oscillator frequency (fosc(ctrl)LCD) of 1536 Hz at pin CLK. The oscillator
frequency range is 397 Hz to 3046 Hz.
6.21.13.1 I2C-bus controller
The LCD controller acts as an I2C-bus slave receiver. In the LPC2157/2158 the hardware
subaddress inputs A0, A1 and A2 are tied to VSS setting the hardware subaddress = 0.
6.21.14 Input filters
To enhance noise immunity in electrically adverse environments, RC low-pass filters are
provided on the SDA and SCL lines.
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6.21.15 I2C-bus slave addresses
The I2C-bus slave address is 0111 0000. The LCD controller is a write-only device and will
not respond to a read access.
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7. Limiting values
Table 6.
Limiting values
In accordance with the Absolute Maximum Rating System (IEC 60134).[1]
Symbol
VDD
Parameter
Conditions
Min
Max
+3.6
+4.6
+4.6
+4.6
+5.1
Unit
V
supply voltage (core and external rail)
analog 3.3 V pad supply voltage
input voltage on pin VBAT
input voltage on pin VREF
analog input voltage
−0.5
−0.5
−0.5
−0.5
−0.5
VDDA
V
Vi(VBAT)
Vi(VREF)
VIA
for the RTC
V
V
on ADC related
pins
V
[2]
VI
input voltage
5 V tolerant I/O
pins; only valid
when the VDD
supply voltage is
present
−0.5
+6.0
V
[2][3]
[4]
other I/O pins
per supply pin
per ground pin
−0.5
VDD + 0.5
100
V
IDD
supply current
-
mA
mA
°C
W
[4]
ISS
ground current
-
100
[5]
Tstg
storage temperature
total power dissipation (per package)
−65
+150
1.5
Ptot(pack)
based on package
heat transfer, not
device power
-
consumption
[1] The following applies to the Limiting values:
a) This product includes circuitry specifically designed for the protection of its internal devices from the damaging effects of excessive
static charge. Nonetheless, it is suggested that conventional precautions be taken to avoid applying greater than the rated maximum.
b) Parameters are valid over operating temperature range unless otherwise specified. All voltages are with respect to VSS unless
otherwise noted.
[2] Including voltage on outputs in 3-state mode.
[3] Not to exceed 4.6 V.
[4] The peak current is limited to 25 times the corresponding maximum current.
[5] Dependent on package type.
LPC2157_2158_1
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Product data sheet
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NXP Semiconductors
Single-chip 16-bit/32-bit microcontrollers
8. Static characteristics
Table 7.
Static characteristics
Tamb = −40 °C to +85 °C for commercial applications, unless otherwise specified.
Symbol
VDD
Parameter
Conditions
Min
3.0
3.0
Typ[1]
3.3
Max
3.6
Unit
V
[2]
[3]
supply voltage
VDDA
analog 3.3 V pad supply
voltage
3.3
3.6
V
Vi(VBAT)
Vi(VREF)
input voltage on pin
VBAT
2.0
2.5
3.3
3.3
3.6
V
V
input voltage on pin
VREF
VDDA
Standard port pins, RESET, RTCK
IIL
LOW-level input current VI = 0 V; no pull-up
HIGH-level input current VI = VDD; no pull-down
-
-
-
-
-
-
3
3
3
µA
µA
µA
IIH
IOZ
OFF-state output
current
VO = 0 V; VO = VDD; no
pull-up/down
Ilatch
I/O latch-up current
−(0.5VDD) < VI < (1.5VDD);
Tj < 125 °C
-
-
-
100
5.5
mA
V
[4][5][6]
VI
input voltage
pin configured to provide a
digital function
0
VO
output voltage
output active
0
-
VDD
V
V
V
V
V
VIH
VIL
HIGH-level input voltage
LOW-level input voltage
hysteresis voltage
2.0
-
-
-
-
-
0.8
Vhys
VOH
0.4
-
-
-
[7]
[7]
[7]
[7]
[8]
[8]
HIGH-level output
voltage
IOH = −4 mA
V
DD − 0.4
VOL
IOH
LOW-level output
voltage
IOL = −4 mA
-
-
-
-
-
-
0.4
-
V
HIGH-level output
current
VOH = VDD − 0.4 V
VOL = 0.4 V
−4
4
-
mA
mA
mA
mA
IOL
LOW-level output
current
-
IOHS
IOLS
HIGH-level short-circuit VOH = 0 V
output current
−45
50
LOW-level short-circuit VOL = VDDA
output current
-
[9]
[10]
[9]
Ipd
Ipu
pull-down current
pull-up current
VI = 5 V
10
−15
0
50
−50
0
150
−85
0
µA
µA
µA
VI = 0 V
VDD < VI < 5 V
LPC2157_2158_1
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Product data sheet
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LPC2157/2158
NXP Semiconductors
Single-chip 16-bit/32-bit microcontrollers
Table 7.
Static characteristics …continued
Tamb = −40 °C to +85 °C for commercial applications, unless otherwise specified.
Symbol
Parameter
Conditions
Min
Typ[1]
Max
Unit
IDD(act)
active mode supply
current
VDD = 3.3 V; Tamb = 25 °C;
code
-
15
50
mA
while(1){}
executed from flash, no active
peripherals
CCLK = 10 MHz
CCLK = 60 MHz
-
-
40
27
70
70
mA
mA
VDD = 3.3 V; Tamb = 25 °C;
code executed from flash; USB
enabled and active; all other
peripherals disabled
CCLK = 12 MHz
CCLK = 60 MHz
-
-
-
-
57
90
mA
µA
µA
µA
IDD(pd)
Power-down mode
supply current
VDD = 3.3 V; Tamb = 25 °C
VDD = 3.3 V; Tamb = 85 °C
40
100
500
30
250
15
[11]
[11]
IBATpd
Power-down mode
RTC clock = 32 kHz
(from RTCX pins);
amb = 25 °C
battery supply current
T
VDD = 3.0 V; Vi(VBAT) = 2.5 V
VDD = 3.0 V; Vi(VBAT) = 3.0 V
-
-
20
78
40
-
µA
µA
IBATact
active mode battery
supply current
CCLK = 60 MHz;
PCLK = 15 MHz;
PCLK enabled to RTCK;
RTC clock = 32 kHz
(from RTCX pins);
T
amb = 25 °C
VDD = 3.0 V; Vi(VBAT) = 3.0 V
[11][12]
IBATact(opt) optimized active mode
battery supply current
PCLK disabled to RTCK in the
PCONP register;
RTC clock = 32 kHz
(from RTCX pins);
-
-
23
30
-
-
µA
µA
T
amb = 25 °C; Vi(VBAT) = 3.3 V
CCLK = 25 MHz
CCLK = 60 MHz
I2C-bus pins
VIH
VIL
HIGH-level input voltage
LOW-level input voltage
hysteresis voltage
0.7VDD
-
-
V
V
V
V
-
-
-
-
0.3VDD
Vhys
VOL
0.5VDD
-
-
[7]
LOW-level output
voltage
IOLS = 3 mA
0.4
[13]
ILI
input leakage current
VI = VDD
VI = 5 V
-
-
2
4
µA
µA
10
22
Oscillator pins
Vi(XTAL1)
input voltage on pin
XTAL1
0
-
1.8
V
LPC2157_2158_1
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Product data sheet
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LPC2157/2158
NXP Semiconductors
Single-chip 16-bit/32-bit microcontrollers
Table 7.
Static characteristics …continued
Tamb = −40 °C to +85 °C for commercial applications, unless otherwise specified.
Symbol
Parameter
Conditions
Min
Typ[1]
Max
Unit
Vo(XTAL2)
output voltage on pin
XTAL2
0
-
1.8
V
Vi(RTCX1)
input voltage on pin
RTCX1
0
0
-
-
1.8
1.8
V
V
Vo(RTCX2) output voltage on pin
RTCX2
USB pins
IOZ
OFF-state output
current
0 V < VI < 3.3 V
-
-
±10
µA
VBUS
VDI
bus supply voltage
-
-
-
5.25
-
V
V
differential input
|(D+) − (D−)|
0.2
sensitivity voltage
VCM
differential common
mode voltage range
includes VDI range
0.8
0.8
-
-
2.5
2.0
V
V
Vth(rs)se
single-ended receiver
switching threshold
voltage
VOL
VOH
LOW-level output
voltage
RL of 1.5 kΩ to 3.6 V
RL of 15 kΩ to GND
-
-
-
0.3
3.6
V
V
HIGH-level output
voltage
2.8
Ctrans
ZDRV
transceiver capacitance pin to GND
-
-
-
20
44
pF
[14]
driver output impedance steady state drive
for driver which is not
29
Ω
high-speed capable
Rpu
pull-up resistance
SoftConnect = ON
1.1
-
1.9
kΩ
[1] Typical ratings are not guaranteed. The values listed are at room temperature (25 °C), nominal supply voltages.
[2] Core and external rail.
[3] The RTC typically fails when Vi(VBAT) drops below 1.6 V.
[4] Including voltage on outputs in 3-state mode.
[5] VDD supply voltages must be present.
[6] 3-state outputs go into 3-state mode when VDD is grounded.
[7] Accounts for 100 mV voltage drop in all supply lines.
[8] Allowed as long as the current limit does not exceed the maximum current allowed by the device.
[9] Minimum condition for VI = 4.5 V, maximum condition for VI = 5.5 V.
[10] Applies to P1[16] to P1[31].
[11] On pin VBAT.
[12] Optimized for low battery consumption.
[13] To VSS
.
[14] Includes external resistors of 18 Ω ±1 % on D+ and D−.
LPC2157_2158_1
© NXP B.V. 2008. All rights reserved.
Product data sheet
Rev. 01 — 15 October 2008
34 of 45
LPC2157/2158
NXP Semiconductors
Single-chip 16-bit/32-bit microcontrollers
Table 8.
ADC static characteristics
VDDA = 2.5 V to 3.6 V; Tamb = −40 °C to +85 °C unless otherwise specified; ADC frequency 4.5 MHz.
Symbol
VIA
Parameter
Conditions
Min
Typ
Max
VDDA
1
Unit
V
analog input voltage
analog input capacitance
differential linearity error
integral non-linearity
offset error
0
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
Cia
pF
[1][2]
[3]
ED
VSSA = 0 V, VDDA = 3.3 V
VSSA = 0 V, VDDA = 3.3 V
VSSA = 0 V, VDDA = 3.3 V
VSSA = 0 V, VDDA = 3.3 V
VSSA = 0 V, VDDA = 3.3 V
±1
LSB
LSB
LSB
%
EL(adj)
EO
±2
[4]
±3
[5]
EG
gain error
±0.5
±4
[6]
ET
absolute error
LSB
kΩ
[7]
Rvsi
voltage source interface
resistance
40
[1] The ADC is monotonic, there are no missing codes.
[2] The differential linearity error (ED) is the difference between the actual step width and the ideal step width. See Figure 7.
[3] The integral non-linearity (EL(adj)) is the peak difference between the center of the steps of the actual and the ideal transfer curve after
appropriate adjustment of gain and offset errors. See Figure 7.
[4] The offset error (EO) is the absolute difference between the straight line which fits the actual curve and the straight line which fits the
ideal curve. See Figure 7.
[5] The gain error (EG) is the relative difference in percent between the straight line fitting the actual transfer curve after removing offset
error, and the straight line which fits the ideal transfer curve. See Figure 7.
[6] The absolute error (ET) is the maximum difference between the center of the steps of the actual transfer curve of the non-calibrated ADC
and the ideal transfer curve. See Figure 7.
[7] See Figure 8.
LPC2157_2158_1
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Product data sheet
Rev. 01 — 15 October 2008
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LPC2157/2158
NXP Semiconductors
Single-chip 16-bit/32-bit microcontrollers
offset
error
gain
error
E
E
O
G
1023
1022
1021
1020
1019
1018
(2)
7
code
out
(1)
6
5
4
3
2
1
0
(5)
(4)
(3)
1 LSB
(ideal)
1018 1019 1020 1021 1022 1023 1024
1
2
3
4
5
6
7
V
IA
(LSB
)
ideal
offset error
E
O
V
− V
DDA SSA
1 LSB =
1024
002aac046
(1) Example of an actual transfer curve.
(2) The ideal transfer curve.
(3) Differential linearity error (ED).
(4) Integral non-linearity (EL(adj)).
(5) Center of a step of the actual transfer curve.
Fig 7. ADC characteristics
LPC2157_2158_1
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Product data sheet
Rev. 01 — 15 October 2008
36 of 45
LPC2157/2158
NXP Semiconductors
Single-chip 16-bit/32-bit microcontrollers
LPC2XXX
R
vsi
20 kΩ
ADx[y]
ADx[y]
SAMPLE
3 pF
5 pF
V
EXT
V
SS
002aad458
Fig 8. Suggested ADC interface - LPC2157/2158 ADx[y] pin
LPC2157_2158_1
© NXP B.V. 2008. All rights reserved.
Product data sheet
Rev. 01 — 15 October 2008
37 of 45
LPC2157/2158
NXP Semiconductors
Single-chip 16-bit/32-bit microcontrollers
9. Dynamic characteristics
Table 9.
Dynamic characteristics of USB pins (full-speed)
CL = 50 pF; Rpu = 1.5 kΩ on D+ to VDD, unless otherwise specified.
Symbol
Parameter
rise time
fall time
Conditions
10 % to 90 %
10 % to 90 %
(tr/tf)
Min
4
Typ
Max
20
Unit
ns
tr
-
-
-
tf
4
20
ns
tFRFM
differential rise and fall time
matching
90
110
%
VCRS
output signal crossover voltage
source SE0 interval of EOP
1.3
160
−2
-
-
-
2.0
175
+5
V
tFEOPT
tFDEOP
see Figure 10
ns
ns
source jitter for differential transition see Figure 10
to SE0 transition
tJR1
receiver jitter to next transition
−18.5
−9
-
-
-
+18.5
ns
ns
ns
tJR2
receiver jitter for paired transitions
EOP width at receiver
10 % to 90 %
+9
-
[1]
[1]
tEOPR1
must reject as
EOP; see
Figure 10
40
tEOPR2
EOP width at receiver
must accept as
EOP; see
82
-
-
ns
Figure 10
[1] Characterized but not implemented as production test. Guaranteed by design.
Table 10. Dynamic characteristics
Tamb = −40 °C to +85 °C for commercial applications, VDD over specified ranges[1]
Symbol
External clock
fosc
Parameter
Conditions
Min
Typ[2]
Max
Unit
oscillator frequency
clock cycle time
clock HIGH time
clock LOW time
clock rise time
10
40
-
-
-
-
-
-
25
100
-
MHz
ns
Tcy(clk)
tCHCX
T
T
-
cy(clk) × 0.4
ns
tCLCX
cy(clk) × 0.4
-
ns
tCLCH
5
ns
tCHCL
clock fall time
-
5
ns
Port pins (P0[2], P0[3], P0[11], and P0[14])
tr(o)
tf(o)
output rise time
-
-
10
10
-
-
ns
ns
output fall time
I2C-bus pins (P0[2], P0[3], P0[11], and P0[14])
[3]
tf(o) output fall time
VIH to VIL
20 + 0.1 × Cb
-
-
ns
[1] Parameters are valid over operating temperature range unless otherwise specified.
[2] Typical ratings are not guaranteed. The values listed are at room temperature (25 °C), nominal supply voltages.
[3] Bus capacitance Cb in pF, from 10 pF to 400 pF.
LPC2157_2158_1
© NXP B.V. 2008. All rights reserved.
Product data sheet
Rev. 01 — 15 October 2008
38 of 45
LPC2157/2158
NXP Semiconductors
Single-chip 16-bit/32-bit microcontrollers
9.1 Timing
t
CHCX
t
CLCH
t
t
CHCL
CLCX
T
cy(clk)
002aaa907
Fig 9. External clock timing (with an amplitude of at least Vi(RMS) = 200 mV)
t
PERIOD
crossover point
extended
crossover point
differential
data lines
source EOP width: t
FEOPT
differential data to
SE0/EOP skew
n × t
+ t
PERIOD
FDEOP
receiver EOP width: t
, t
EOPR1 EOPR2
002aab561
Fig 10. Differential data-to-EOP transition skew and EOP width
10. Application information
10.1 Suggested USB interface solutions
V
DD
CONNECT
soft-connect switch
LPC2158
R1
1.5 kΩ
VBUS
R
= 33 Ω
= 33 Ω
USB-B
connector
S
D+
R
S
D−
V
SS
002aad410
Fig 11. LPC2158 USB interface using the CONNECT function on pin 17
LPC2157_2158_1
© NXP B.V. 2008. All rights reserved.
Product data sheet
Rev. 01 — 15 October 2008
39 of 45
LPC2157/2158
NXP Semiconductors
Single-chip 16-bit/32-bit microcontrollers
V
DD
R2
LPC2158
R1
1.5 kΩ
UP_LED
VBUS
USB-B
connector
R
= 33 Ω
= 33 Ω
S
D+
R
S
D−
V
SS
002aad411
Fig 12. LPC2158 USB interface using the UP_LED function on pin 17
LPC2157_2158_1
© NXP B.V. 2008. All rights reserved.
Product data sheet
Rev. 01 — 15 October 2008
40 of 45
LPC2157/2158
NXP Semiconductors
Single-chip 16-bit/32-bit microcontrollers
11. Package outline
LQFP100: plastic low profile quad flat package; 100 leads; body 14 x 14 x 1.4 mm
SOT407-1
y
X
A
51
75
50
26
(1)
76
Z
E
e
H
A
E
2
E
A
(A )
3
A
1
w M
p
θ
b
L
p
pin 1 index
L
detail X
100
1
25
Z
D
v
M
A
B
e
w M
b
p
D
B
H
v
M
5
D
0
10 mm
scale
DIMENSIONS (mm are the original dimensions)
A
(1)
(1)
(1)
UNIT
A
A
A
b
c
D
E
e
H
D
H
L
L
v
w
y
Z
Z
θ
1
2
3
p
E
p
D
E
max.
7o
0o
0.15 1.45
0.05 1.35
0.27 0.20 14.1 14.1
0.17 0.09 13.9 13.9
16.25 16.25
15.75 15.75
0.75
0.45
1.15 1.15
0.85 0.85
mm
1.6
0.25
0.5
1
0.2 0.08 0.08
Note
1. Plastic or metal protrusions of 0.25 mm maximum per side are not included.
REFERENCES
OUTLINE
EUROPEAN
PROJECTION
ISSUE DATE
VERSION
IEC
JEDEC
JEITA
00-02-01
03-02-20
SOT407-1
136E20
MS-026
Fig 13. Package outline SOT407-1 (LQFP100)
LPC2157_2158_1
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Product data sheet
Rev. 01 — 15 October 2008
41 of 45
LPC2157/2158
NXP Semiconductors
Single-chip 16-bit/32-bit microcontrollers
12. Abbreviations
Table 11. Abbreviations
Acronym
ADC
AHB
AMBA
APB
BOD
DAC
DCC
DMA
FIFO
GPIO
I/O
Description
Analog-to-Digital Converter
Advanced High-performance Bus
Advanced Microcontroller Bus Architecture
Advanced Peripheral Bus
Brown-Out Detection
Digital-to-Analog Converter
Debug Communications Channel
Direct Memory Access
First In, First Out
General Purpose Input/Output
Input/Output
ISP
In-System Programming
Joint Test Action Group
JTAG
MCU
PLL
Microcontroller Unit
Phase-Locked Loop
POR
PWM
RC
Power-On Reset
Pulse Width Modulator
Resistance-Capacitance
Serial Peripheral Interface
Synchronous Serial Interface
Synchronous Serial Port
Transistor-Transistor Logic
Universal Asynchronous Receiver/Transmitter
SPI
SSI
SSP
TTL
UART
LPC2157_2158_1
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Product data sheet
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42 of 45
LPC2157/2158
NXP Semiconductors
Single-chip 16-bit/32-bit microcontrollers
13. Revision history
Table 12. Revision history
Document ID
Release date
20081015
Data sheet status
Change notice
Supersedes
LPC2157_2158_1
Product data sheet
-
-
LPC2157_2158_1
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Product data sheet
Rev. 01 — 15 October 2008
43 of 45
LPC2157/2158
NXP Semiconductors
Single-chip 16-bit/32-bit microcontrollers
14. Legal information
14.1 Data sheet status
Document status[1][2]
Product status[3]
Development
Definition
Objective [short] data sheet
This document contains data from the objective specification for product development.
This document contains data from the preliminary specification.
This document contains the product specification.
Preliminary [short] data sheet Qualification
Product [short] data sheet Production
[1]
[2]
[3]
Please consult the most recently issued document before initiating or completing a design.
The term ‘short data sheet’ is explained in section “Definitions”.
The product status of device(s) described in this document may have changed since this document was published and may differ in case of multiple devices. The latest product status
information is available on the Internet at URL http://www.nxp.com.
damage. NXP Semiconductors accepts no liability for inclusion and/or use of
NXP Semiconductors products in such equipment or applications and
therefore such inclusion and/or use is at the customer’s own risk.
14.2 Definitions
Draft — The document is a draft version only. The content is still under
internal review and subject to formal approval, which may result in
modifications or additions. NXP Semiconductors does not give any
representations or warranties as to the accuracy or completeness of
information included herein and shall have no liability for the consequences of
use of such information.
Applications — Applications that are described herein for any of these
products are for illustrative purposes only. NXP Semiconductors makes no
representation or warranty that such applications will be suitable for the
specified use without further testing or modification.
Limiting values — Stress above one or more limiting values (as defined in
the Absolute Maximum Ratings System of IEC 60134) may cause permanent
damage to the device. Limiting values are stress ratings only and operation of
the device at these or any other conditions above those given in the
Characteristics sections of this document is not implied. Exposure to limiting
values for extended periods may affect device reliability.
Short data sheet — A short data sheet is an extract from a full data sheet
with the same product type number(s) and title. A short data sheet is intended
for quick reference only and should not be relied upon to contain detailed and
full information. For detailed and full information see the relevant full data
sheet, which is available on request via the local NXP Semiconductors sales
office. In case of any inconsistency or conflict with the short data sheet, the
full data sheet shall prevail.
Terms and conditions of sale — NXP Semiconductors products are sold
subject to the general terms and conditions of commercial sale, as published
at http://www.nxp.com/profile/terms, including those pertaining to warranty,
intellectual property rights infringement and limitation of liability, unless
explicitly otherwise agreed to in writing by NXP Semiconductors. In case of
any inconsistency or conflict between information in this document and such
terms and conditions, the latter will prevail.
14.3 Disclaimers
General — Information in this document is believed to be accurate and
reliable. However, NXP Semiconductors does not give any representations or
warranties, expressed or implied, as to the accuracy or completeness of such
information and shall have no liability for the consequences of use of such
information.
No offer to sell or license — Nothing in this document may be interpreted
or construed as an offer to sell products that is open for acceptance or the
grant, conveyance or implication of any license under any copyrights, patents
or other industrial or intellectual property rights.
Right to make changes — NXP Semiconductors reserves the right to make
changes to information published in this document, including without
limitation specifications and product descriptions, at any time and without
notice. This document supersedes and replaces all information supplied prior
to the publication hereof.
14.4 Trademarks
Notice: All referenced brands, product names, service names and trademarks
are the property of their respective owners.
Suitability for use — NXP Semiconductors products are not designed,
authorized or warranted to be suitable for use in medical, military, aircraft,
space or life support equipment, nor in applications where failure or
malfunction of an NXP Semiconductors product can reasonably be expected
to result in personal injury, death or severe property or environmental
I2C-bus — logo is a trademark of NXP B.V.
GoodLink — is a trademark of NXP B.V.
SoftConnect — is a trademark of NXP B.V.
15. Contact information
For more information, please visit: http://www.nxp.com
For sales office addresses, please send an email to: salesaddresses@nxp.com
LPC2157_2158_1
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Product data sheet
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44 of 45
LPC2157/2158
NXP Semiconductors
Single-chip 16-bit/32-bit microcontrollers
16. Contents
1
2
3
4
General description . . . . . . . . . . . . . . . . . . . . . . 1
6.19.7
6.19.8
6.19.9
6.20
6.20.1
6.20.2
6.21
6.21.1
6.21.2
6.21.3
6.21.4
Memory mapping control . . . . . . . . . . . . . . . . 25
Power control . . . . . . . . . . . . . . . . . . . . . . . . . 25
APB bus . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 26
Emulation and debugging. . . . . . . . . . . . . . . . 26
EmbeddedICE . . . . . . . . . . . . . . . . . . . . . . . . 26
RealMonitor . . . . . . . . . . . . . . . . . . . . . . . . . . 27
LCD driver . . . . . . . . . . . . . . . . . . . . . . . . . . . 27
General description . . . . . . . . . . . . . . . . . . . . 27
Functional description . . . . . . . . . . . . . . . . . . 27
LCD bias voltages . . . . . . . . . . . . . . . . . . . . . 27
Oscillator . . . . . . . . . . . . . . . . . . . . . . . . . . . . 28
Features . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1
Ordering information. . . . . . . . . . . . . . . . . . . . . 1
Block diagram . . . . . . . . . . . . . . . . . . . . . . . . . . 2
5
5.1
5.2
Pinning information. . . . . . . . . . . . . . . . . . . . . . 4
Pinning . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4
Pin description . . . . . . . . . . . . . . . . . . . . . . . . . 5
6
6.1
6.2
6.3
6.4
6.5
6.5.1
6.6
6.7
6.7.1
6.8
6.8.1
6.9
6.9.1
6.10
6.10.1
6.11
6.11.1
6.12
6.12.1
6.13
6.13.1
6.14
6.14.1
6.15
Functional description . . . . . . . . . . . . . . . . . . 15
Architectural overview. . . . . . . . . . . . . . . . . . . 15
On-chip flash program memory . . . . . . . . . . . 15
On-chip static RAM. . . . . . . . . . . . . . . . . . . . . 15
Memory map. . . . . . . . . . . . . . . . . . . . . . . . . . 16
Interrupt controller . . . . . . . . . . . . . . . . . . . . . 16
Interrupt sources. . . . . . . . . . . . . . . . . . . . . . . 17
Pin connect block . . . . . . . . . . . . . . . . . . . . . . 17
Fast general purpose parallel I/O . . . . . . . . . . 17
Features . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18
10-bit ADC . . . . . . . . . . . . . . . . . . . . . . . . . . . 18
Features . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18
10-bit DAC . . . . . . . . . . . . . . . . . . . . . . . . . . . 18
Features . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18
USB 2.0 device controller (LPC2158 only) . . . 18
Features . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19
UARTs . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19
Features . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19
I2C-bus serial I/O controller . . . . . . . . . . . . . . 20
Features . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20
SPI serial I/O controller. . . . . . . . . . . . . . . . . . 20
Features . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20
SSP serial I/O controller . . . . . . . . . . . . . . . . . 20
Features . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21
General purpose timers/external event
counters . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21
Features . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21
Watchdog timer. . . . . . . . . . . . . . . . . . . . . . . . 22
Features . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22
Real-time clock . . . . . . . . . . . . . . . . . . . . . . . . 22
Features . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22
Pulse width modulator . . . . . . . . . . . . . . . . . . 22
Features . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 23
System control . . . . . . . . . . . . . . . . . . . . . . . . 24
Crystal oscillator . . . . . . . . . . . . . . . . . . . . . . . 24
PLL . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 24
Reset and wake-up timer . . . . . . . . . . . . . . . . 24
Brownout detector. . . . . . . . . . . . . . . . . . . . . . 25
Code security . . . . . . . . . . . . . . . . . . . . . . . . . 25
External interrupt inputs . . . . . . . . . . . . . . . . . 25
6.21.4.1 Internal clock . . . . . . . . . . . . . . . . . . . . . . . . . 28
6.21.5
6.21.6
6.21.7
6.21.8
6.21.9
Timing . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 28
Display register. . . . . . . . . . . . . . . . . . . . . . . . 28
Segment outputs . . . . . . . . . . . . . . . . . . . . . . 28
Backplane outputs . . . . . . . . . . . . . . . . . . . . . 28
Display RAM. . . . . . . . . . . . . . . . . . . . . . . . . . 28
6.21.10 Data pointer . . . . . . . . . . . . . . . . . . . . . . . . . . 28
6.21.11 Output bank selector . . . . . . . . . . . . . . . . . . . 29
6.21.12 Input bank selector. . . . . . . . . . . . . . . . . . . . . 29
6.21.13 Blinker . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 29
6.21.13.1 I2C-bus controller . . . . . . . . . . . . . . . . . . . . . . 29
6.21.14 Input filters . . . . . . . . . . . . . . . . . . . . . . . . . . . 29
6.21.15 I2C-bus slave addresses . . . . . . . . . . . . . . . . 30
7
Limiting values . . . . . . . . . . . . . . . . . . . . . . . . 31
Static characteristics . . . . . . . . . . . . . . . . . . . 32
Dynamic characteristics. . . . . . . . . . . . . . . . . 38
Timing . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 39
Application information . . . . . . . . . . . . . . . . . 39
Suggested USB interface solutions . . . . . . . . 39
Package outline . . . . . . . . . . . . . . . . . . . . . . . . 41
Abbreviations . . . . . . . . . . . . . . . . . . . . . . . . . 42
Revision history . . . . . . . . . . . . . . . . . . . . . . . 43
8
9
9.1
10
10.1
11
12
13
6.15.1
6.16
6.16.1
6.17
6.17.1
6.18
6.18.1
6.19
6.19.1
6.19.2
6.19.3
6.19.4
6.19.5
6.19.6
14
Legal information . . . . . . . . . . . . . . . . . . . . . . 44
Data sheet status . . . . . . . . . . . . . . . . . . . . . . 44
Definitions . . . . . . . . . . . . . . . . . . . . . . . . . . . 44
Disclaimers. . . . . . . . . . . . . . . . . . . . . . . . . . . 44
Trademarks . . . . . . . . . . . . . . . . . . . . . . . . . . 44
14.1
14.2
14.3
14.4
15
16
Contact information . . . . . . . . . . . . . . . . . . . . 44
Contents. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 45
Please be aware that important notices concerning this document and the product(s)
described herein, have been included in section ‘Legal information’.
© NXP B.V. 2008.
All rights reserved.
For more information, please visit: http://www.nxp.com
For sales office addresses, please send an email to: salesaddresses@nxp.com
Date of release: 15 October 2008
Document identifier: LPC2157_2158_1
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