LPC2131/2132/2138 User Manual - mct.net

Philips Semiconductors Preliminary User Manual
ARM-based Microcontroller
8. GPIO
FEATURES
Direction control of individual bits
Separate control of output set and clear
All I/O default to inputs after reset
APPLICATIONS
General purpose I/O
Driving LEDs, or other indicators
Controlling off-chip devices
Sensing digital inputs
PIN DESCRIPTION
Table 54: GPIO Pin Description
Pin Name Type Description
P0.0 - P0.31
P1.16 - P1.31
Input/
Output
REGISTER DESCRIPTION
LPC2131/2132/2138
General purpose input/output. The number of GPIOs actually available depends on the use of
alternate functions.
LPC2131/2132/2138 has two 32-bit General Purpose I/O ports. Total of 30 input/output and a single output only pin out of 32
pins are available on PORT0. PORT1 has up to 16 pins available for GPIO functions. PORT0 and PORT1 are controlled via two
groups of 4 registers as shown in Table 55.
GPIO 85 November 22, 2004