LPC2131 datasheet(20/41 Pages) PHILIPS

20 / 41 page

9397 750 14868

Preliminary data sheet

Rev. 02 — 15 April 2005

20 of 41

Philips Semiconductors

LPC2131/2132/2134/2136/2138

Single-chip 16/32-bit microcontrollers

6.10 General purpose parallel I/O

Device pins that are not connected to a speciﬁc peripheral function are controlled by the

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

registers allow setting or clearing any number of outputs simultaneously. The value of the

output register may be read back, as well as the current state of the port pins.

6.10.1 Features

• Direction control of individual bits.

• Separate control of output set and clear.

• All I/O default to inputs after reset.

6.11 10-bit A/D converter

The LPC2131/32 contain one and the LPC2134/2136/2138 contains two analog to digital

converters. These converters are single 10-bit successive approximation analog to digital

converters with eight multiplexed channels.

6.11.1 Features

• Measurement range of 0 V to 3.3 V.

• Each converter capable of performing more than 400,000 10-bit samples per second.

• Burst conversion mode for single or multiple inputs.

• Optional conversion on transition on input pin or Timer Match signal.

• Global Start command for both converters (LPC2134/2136/2138 only).

6.12 10-bit D/A converter

This peripheral is available in the LPC2132/2134/2136/2138 only. The D/A converter

enables the LPC2132/2134/2136/2138 to generate variable analog output.

6.12.1 Features

• 10 bit digital to analog converter.

• Buffered output.

• Power-down mode available.

• Selectable speed versus power.

Table 8:

Pin function select register 2 (PINSEL2 - 0xE002C014)

PINSEL2 bits

Description

Reset value

1:0

Reserved

When 0, pins P1.31:26 are GPIO pins. When 1,

P1.31:26 are used as Debug port.

When 0, pins P1.25:16 are used as GPIO pins. When 1,

P1.25:16 are used as Trace port.

31:30

Reserved

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