AT85C5122D-RDTUM datasheet(53/208 Pages) ATMEL

53 / 208 page

AT83R5122, AT8xC5122/23

4202F–SCR–07/2008

Port 3

Port 3 has the following functions:

–

Default function: Port 3 is an 8-bit I/O port.

–

Alternate functions: see table below

Port 3 has the following configurations:

–

Default configuration: Pseudo bi-directional “Port51” digital input/output with

internal pull-ups.

–

Alternate configurations: See Table 32.

Table 32.

Port 3 Description

Port

Alternate Functions

Configurations

Signal

Description

Mode 1

Mode 2

Mode 3

Mode 4

P3.0

RxD

Receiver data input (asynchronous) or data input/output

(synchronous) of the serial interface

Push-pull

KB_OUT

Input WPU

P3.1

TxD

Transmitter data output (asynchronous) or clock output

(synchronous) of the serial interface

Push-pull

KB_OUT

Input WPU

P3.2

INT0

External interrupt 0 input/timer 0 gate control input

LED0

P3.3

INT1

External interrupt 1input/timer 1 gate control input

Push-pull

KB_OUT

Input WPU

P3.4

Timer 0 counter input

Push-pull

KB_OUT

Input WPU

LED1

P3.5

Timer 1 counter input

P3.6

External Data Memory write strobe; latches the data byte

from port 0 into the external data memory

LED2

P3.7

External Data Memory read strobe; Enables the external

data memory. Port 3 can drive CMOS inputs without external

pull-ups

LED3

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