AT89C5121 데이터 시트보기 (PDF) - Atmel Corporation

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AT89C5121

8-bit Microcontroller with Multiprotocol Smart Card Interface

Atmel Corporation 

Description

Block Diagram

Figure 1. Block Diagram

T8xC5121 is a high performance CMOS ROM/CRAM derivative of the 80C51 CMOS

single chip 8-bit microcontrollers.

T8xC5121 retains the features of the Atmel 80C51 with extended ROM capacity (16

Kbytes), 512 bytes of internal RAM, a 4-level interrupt system, two 16-bit timer/counters

(T0/T1), a full duplex enhanced UART (EUART) with baud rate generator (BRG) and an

on-chip oscillator.

In addition, the T8xC5121 have, a Multi protocol Smart Card Interface, a dual data

pointer, 2 programmable LED current sources (2-4-10 mA) and a hardware Watchdog.

T89C5121 Flash RAM version and T85C5121 Code RAM version can be loaded by In-

System Programming (ISP) software residing in the on-chip ROM from a low-cost exter-

nal serial EEPROM or from R232 interface.

T8xC5121 have 2 software-selectable modes of reduced activity for further reduction in

power consumption.

(2) (2)

XTAL1

XTAL2

EA

PSEN

ALE

Xtal

Osc

:1-16

Clock

Prescaler

X2

(4)

CPU

RAM

EUART 256 x8

BRG

ROM

16K x8

(3)

CRAM

16K x8

XRAM

256

x8

C51

CORE

IB-bus

Voltage

Reg.

Timer 0 INT

Timer 1 Ctrl

(2) (2) (2) (2)

Watchdog

POR

PFD

6 I/Os 8 I/Os

Parallel I/O Ports

Direct

Drive

LED

Output

(2) (2)

DC/DC

Converter

Level

Shifters

SCIB

Alternate

Card

CVCC

(1(((111))))CCRCCCSCIOT84

(1) CCLK

(1)CPRES

(2)

CIO1

(2)

CRST1

(2)

CCLK1

Notes:

(1):

1. Alternate function of Port 1

2. Alternate function of Port 3

3. Only for the Code RAM version

4. Only for PLCC52

2 A/T8xC5121

4164G–SCR–07/06

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