T83C5121XXX-ICSIL datasheet(9/115 Pages) ATMEL

tên linh kiện	T83C5121XXX-ICSIL

Giải thích chi tiết về linh kiện	8-bit Microcontroller with Multiprotocol Smart Card Interface

PDF	115 Pages

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nhà sản xuất	ATMEL [ATMEL Corporation]

Trang chủ	http://www.atmel.com

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A/T8xC5121

4164G–SCR–07/06

ONLY FOR PLCC52 version

P0[7:0]

AD[7:0]

VCC

I/O

Input/Output function Port 0

P0 is an 8-bit open-drain bi-directional I/O port. Port 0 pins that

have 1s written to them float and can be used as high impedance

inputs. To avoid any parasitic current consumption, Floating P0

inputs must be pulled to VCC or VSS.

I/O

Address/Data low

Mutiplexed Address/Data LSB for external access

P2[7:0]

A[15:8]

VCC

I/O

Input/Output function Port 2

P2 is an 8-bit open-drain bi-directional I/O port with internal pull-ups

Address high

Address Bus MSB for external access

P3.6

DVCC

Write signal

Write signal asserted during external data memory write operation

P3.7

DVCC

Read signal

Read signal asserted during external data memory read operation

ALE

VCC

Address latch enable output

The falling edge of ALE strobes the address into external latch

PSEN

VCC

Program strobe enable

VCC

External access enable

This pin must be held low to force the device to fetch code from

external program memory starting at address 0000h. It is latched

during reset and cannot be dynamically changed during operation.

Table 1. Ports Description (Continued)

Port

Signal

Name

Alternate

Internal

Power

Supply

ESD

Type

Description

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