LPC2104 datasheet(13/32 Pages) PHILIPS

13 / 32 page

Philips Semiconductors

LPC2104/2105/2106

Single-chip 32-bit microcontrollers

Product data

Rev. 04 — 05 February 2004

13 of 32

9397 750 12792

6.6 Pin connect block

The pin connect block allows selected pins of the microcontroller to have more than

one function. Conﬁguration registers control the multiplexers to allow connection

between the pin and the on chip peripherals. Peripherals should be connected to the

appropriate pins prior to being activated, and prior to any related interrupt(s) being

enabled. Activity of any enabled peripheral function that is not mapped to a related

pin should be considered undeﬁned.

The Pin Control Module contains two registers as shown in Table 5.

6.7 Pin function select register 0 (PINSEL0 - 0xE002C000)

The PINSEL0 register controls the functions of the pins as per the settings listed in

Table 6. 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 Table 6 are reserved, and should not be used

System Control

External Interrupt 0 (EINT0)

System Control

External Interrupt 1 (EINT1)

System Control

External Interrupt 2 (EINT2)

Table 4:

Interrupt sources…continued

Block

Flag(s)

VIC channel #

Table 5:

Address

Name

Description

Access

0xE002C000

PINSEL0

Pin function select register 0

Read/Write

0xE002C004

PINSEL1

Pin function select register 1

Read/Write

Table 6:

Pin function select register 0 (PINSEL0 - 0xE002C000)

PINSEL0

Pin name

Value

Function

Value after Reset

1:0

P0.0

GPIO Port 0.0

TxD (UART 0)

PWM1

3:2

P0.1

GPIO Port 0.1

RxD (UART 0)

PWM3

5:4

P0.2

GPIO Port 0.2

SCL (I2C)

Capture 0.0 (Timer 0)

7:6

P0.3

GPIO Port 0.3

01SDA (I2C)

Match 0.0 (Timer 0)

9:8

P0.4

GPIO Port 0.4

SCK (SPI)

Capture 0.1 (Timer 0)

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