Datasheet

Product data sheet Rev. 2.1 — 24 June 2014 40 of 80

NXP Semiconductors

LPC3220/30/40/50

16/32-bit ARM microcontrollers

7.9 Other peripherals

In addition to the communication peripherals there are many general purpose peripherals

available in the LPC3220/30/40/50. Here is a list of the general purpose peripherals.

• GPI/O

• Keyboard scanner

• Touch screen controller and 10-bit Analog-to-Digital-Converter

• Real-time clock

• High-speed timer

• Four general purpose 32-bit timer/external event counters

• Two simple PWMs

• One motor control PWM

A short functional description of each of these peripherals is provided in the following

sections.

7.9.1 General purpose parallel I/O

Some device pins that are not dedicated to a specific peripheral function have been

designed to be general purpose inputs, outputs, or input/outputs. Also, some pins may be

configured either as a specific peripheral function or a general purpose input, output, or

input/output. A total of 51 pins can potentially be used as general purpose input/outputs,

24 as general purpose outputs, and 22 as general purpose inputs.

GPIO pins may be dynamically configured as inputs or outputs. Separate registers allow

setting or clearing any number of GPIO and GPO outputs controlled by that register

simultaneously. The value of the output register for standard GPIOs and GPO pins may

be read back, as well as the current actual state of the port pins.

In addition to GPIO pins on port 0, port 1, and port 2, there are 22 GPI, 24 GPO, and

six GPIO pins. When the SDRAM bus is configured for 16 data bits, 13 of the remaining

SDRAM data pins may be used as GPIOs.

7.9.1.1 Features

• Bit-level set and clear registers allow a single instruction set or clear of any number of

bits in one port.

• A single register selects direction for pins that support both input and output modes.

• Direction control of individual bits.

• For input/output pins, both the programmed output state and the actual pin state can

be read.

• There are a total of 12 general purpose inputs, 24 general purpose outputs, and six

general purpose input/outputs.

• Additionally, 13 SDRAM data lines may be used as GPIOs if a 16-bit SDRAM

interface is used (rather than a 32-bit interface).