Product data

Product data sheet Rev. 2 — 29 May 2012 26 of 67

NXP Semiconductors

LPC3130/3131

Low-cost, low-power ARM926EJ-S microcontrollers

6.17 Input/Output configuration module (IOCONFIG)

The General Purpose Input/Output (GPIO) pins can be controlled through the register

interface provided in the IOCONFIG module. Next to several dedicated GPIO pins, most

digital I/O pins can also be used as GPIO if they are not required for their normal,

dedicated function.

This module has the following features:

• Provides control for the digital pins that can double as GPIO (next to their normal

function). The pinning list in Table 4

indicates which pins can double as GPIO.

• Each pin controlled by the IOCONFIG can be configured for four operational modes:

– Normal operation (i.e. controlled by a function block).

– Driven LOW.

– Driven HIGH.

– High impedance/input.

• The GPIO pins can be observed (read) in any mode.

• The register interface provides set and clear access methods for choosing the

operational mode.

6.18 10-bit Analog-to-Digital Converter (ADC10B)

This module is a 10-bit successive approximation Analog-to-Digital Converter (ADC) with

an input multiplexer to allow for multiple analog signals on its input. A common use of this

module is to read out multiple keys on one input from a resistor network.

This module has the following features:

• Four analog input channels, selected by an analog multiplexer.

• Programmable ADC resolution from 2 bit to 10 bit.

• The maximum conversion rate is 400 ksample/s for 10 bit resolution and

1500 ksample/s for 2 bit resolution.

• Single A/D conversion scan mode and continuous A/D conversion scan mode.

• Power-down mode.

Fig 7. Block diagram of the Watchdog timer

002aae086

EVENT ROUTER

WDT

CGU

INTERRUPT

CONTROLLER

FIQ

IRQ

reset

APB