Gpio - Philips LPC2119 User Manual

Philips Semiconductors
ARM-based Microcontroller

9. 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 67: GPIO Pin Description
Pin Name Type
P0.0 - P0.31 Input/
P1.16 - P1.31 Output
REGISTER DESCRIPTION
LPC2119/2129 has two 32-bit General Purpose I/O ports. Total of 30 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 68.
LPC2292/2294 has two additional ports, PORT2 and PORT3, and they are configured to be used either as external memory data
address and data bus, or as GPIOs sharing pins with a handful of digital and analog functions. Details on PORT2 and PORT3
usage can be found in Pin Configuration and Pin Connect Block chapters.
GPIO
General purpose input/output. The number of GPIOs actually available depends on the use of
alternate functions.
LPC2119/2129/2292/2294
Description
106
Preliminary User Manual
January 08, 2004