83C5121-IL Просмотр технического описания (PDF) - Atmel Corporation

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83C5121-IL

8-bit Microcontroller with Multiprotocol Smart Card Interface

Atmel Corporation 

A/T8xC5121

Table 1. Ports Description (Continued)

Port

Signal

Name

Alternate

Internal

Power

Supply

P3.5

CIO1

DVCC

P3.6

CCLK1

LED0

DVCC

P3.7

P3.7

CRST1

CRST1

LED1

DVCC

DVCC

ESD

Type Description

Input/Output function

I/O

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

Timer 0 function: External clock input

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

increments the count.

Reset configuration

Z

High impedance due to PMOS switched OFF

Alternate card function

I/O

Card I/O

Input/Output function

I/O

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

Timer 1 function: External clock input

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

increments the count.

Reset configuration

I

Input (high level due to internal pull-up)

Alternate card function

O

Card clock

LED function

These pins can be directly connected to the cathode of standard

O 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).

Input/Output function

I/O

P3.6 is a LED port.

Reset configuration

I

Input at high level

Alternate card function

O

Card reset

O 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.

I Reset configuration

Input at high level

7

4164G–SCR–07/06

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