Datasheet

Product data sheet Rev. 05 — 7 March 2007 16 of 35

NXP Semiconductors

LPC2109/2119/2129

Single-chip 16/32-bit microcontrollers

6.9 Pin function select register 2 (PINSEL2 - 0xE002 C014)

The PINSEL2 register controls the functions of the pins as per the settings listed in

Table 8

. The direction control bit in the IODIR register is effective only when the GPIO

function is selected for a pin. For other functions direction is controlled automatically.

Settings other than those shown in the table are reserved, and should not be used.

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 ADC

The LPC2109/2119/2129 each contain single 10-bit successive approximation ADC with

four multiplexed channels.

6.11.1 Features

• Measurement range of 0 V to 3 V.

• Capable of performing more than 400000 10-bit samples per second.

• Burst conversion mode for single or multiple inputs.

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

31:30 P0.31 0 0 Reserved 0

0 1 Reserved

1 0 Reserved

1 1 Reserved

Table 7. Pin function select register 1 (PINSEL1 - 0xE002 C004)

…continued

PINSEL1 Pin Name Value Function Value after

reset

Table 8. Pin function select register 2 (PINSEL2 - 0xE002 C014)

PINSEL2 bits Description Reset value

1:0 Reserved -

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

P1[31:26] are used as Debug port.

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

P1[25:16] are used as Trace port.

31:4 Reserved -