T83C5121 datasheet(6/110 Pages) ATMEL

6 / 110 page

T8xC5121

4164E–SCR–02/04

I/O

Input/Output function

P3.4 is a bi-directional I/O port with internal pull-ups.

Timer 0 function: External clock input

When Timer 0 operates as a counter, a falling edge on the T0 pin

increments the count.

Reset configuration

High impedance due to PMOS switched OFF

P3.5

CIO1

DVCC

I/O

Alternate card function

Card I/O

I/O

Input/Output function

P3.5 is a bi-directional I/O port with internal pull-ups.

Timer 1 function: External clock input

When Timer 1 operates as a counter, a falling edge on the T1 pin

increments the count.

Reset configuration

Input (high level due to internal pull-up)

P3.6

CCLK1

LED1

DVCC

Alternate card function

Card clock

LED function

These pins can be directly connected to the cathode of standard

LED without external current limiting resistors. The typical current

of each output can be programmed by software to 2, 4 or 10 mA

(LEDCON register).

I/O

Input/Output function

P3.6 is a LED port.

Reset configuration

Input at high level

P3.7

CRST1

DVCC

Alternate card function

Card reset

P3.7

CRST1

LED0

DVCC

LED function

These pins can be directly connected to the cathode of standard

LED without external current limiting resistors. The typical current

of each output can be programmed by software to 2, 4 or 10 mA

(LEDCON register).

I/O

Input/Output function

P3.7 is a a LED port.

Reset configuration

Input at high level

Table 1. Ports Description (Continued)

Port

Signal

Name

Alternate

Internal

Power

Supply

ESD

Type

Description

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