LPC2101_02_03_4 © NXP B.V. 2009. All rights reserved.
Product data sheet Rev. 04 — 2 June 2009 6 of 37
NXP Semiconductors
LPC2101/02/03
Single-chip 16-bit/32-bit microcontrollers
5.2 Pin description
Table 3. Pin description
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.
A total of 31 pins of the Port 0 can be used as general purpose bidirectional
digital I/Os while P0.31 is an output only pin. The operation of port 0 pins
depends upon the pin function selected via the pin connect block.
P0.0/TXD0/
MAT3.1
13
[1]
I/O P0.0 — General purpose input/output digital pin.
O TXD0 — Transmitter output for UART0.
O MAT3.1 — PWM output 1 for Timer 3.
P0.1/RXD0/
MAT3.2
14
[1]
I/O P0.1 — General purpose input/output digital pin.
I RXD0 — Receiver input for UART0.
O MAT3.2 — PWM output 2 for Timer 3.
P0.2/SCL0/
CAP0.0
18
[2]
I/O P0.2 — General purpose input/output digital pin. Output is open-drain.
I/O SCL0 — I
2
C0 clock Input/output. Open-drain output (for I
2
C-bus compliance).
I CAP0.0 — Capture input for Timer 0, channel 0.
P0.3/SDA0/
MAT0.0
21
[2]
I/O P0.3 — General purpose input/output digital pin. Output is open-drain.
I/O SDA0 — I
2
C0 data input/output. Open-drain output (for I
2
C-bus compliance).
O MAT0.0 — PWM output for Timer 0, channel 0. Output is open-drain.
P0.4/SCK0/
CAP0.1
22
[1]
I/O P0.4 — General purpose input/output digital pin.
I/O SCK0 — Serial clock for SPI0. SPI clock output from master or input to slave.
I CAP0.1 — Capture input for Timer 0, channel 1.
P0.5/MISO0/
MAT0.1
23
[1]
I/O P0.5 — General purpose input/output digital pin.
I/O MISO0 — Master In Slave Out for SPI0. Data input to SPI master or data
output from SPI slave.
O MAT0.1 — PWM output for Timer 0, channel 1.
P0.6/MOSI0/
CAP0.2
24
[1]
I/O P0.6 — General purpose input/output digital pin.
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.
P0.7/SSEL0/
MAT2.0
28
[1]
I/O P0.7 — General purpose input/output digital pin.
I SSEL0 — Slave Select for SPI0. Selects the SPI interface as a slave.
O MAT2.0 — PWM output for Timer 2, channel 0.
P0.8/TXD1/
MAT2.1
29
[1]
I/O P0.8 — General purpose input/output digital pin.
O TXD1 — Transmitter output for UART1.
O MAT2.1 — PWM output for Timer 2, channel 1.
P0.9/RXD1/
MAT2.2
30
[1]
I/O P0.9 — General purpose input/output digital pin.
I RXD1 — Receiver input for UART1.
O MAT2.2 — PWM output for Timer 2, channel 2.
P0.10/RTS1/
CAP1.0/AD0.3
35
[3]
I/O P0.10 — General purpose input/output digital pin.
O RTS1 — Request to Send output for UART1.
I CAP1.0 — Capture input for Timer 1, channel 0.
I AD0.3 — ADC 0, input 3.
