AT85C5121 datasheet(2/115 Pages) ATMEL

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A/T8xC5121

4164G–SCR–07/06

Description

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.

Block Diagram

Figure 1. Block Diagram

Notes:

1. Alternate function of Port 1

2. Alternate function of Port 3

3. Only for the Code RAM version

4. Only for PLCC52

Timer 0

INT

RAM

256 x8

XTAL2

XTAL1

EUART

CPU

Timer 1

Ctrl

C51

CORE

(2)(2)

IB-bus

(1):

ROM

Xtal

Osc

XRAM

256

SCIB

CC8

CRST

CPRES

CIO

CC4

CCLK

6 I/Os

CRST1

CIO1

CCLK1

(2)

(4)

16K x8

CRAM

16K x8

(2) (2)

8 I/Os

Voltage

Reg.

(1)

LED

Drive

Direct

(2)

Output

:1-16

Clock

(3)

Prescaler

Watchdog

PSEN

ALE

DC/DC

Converter

Level

Shifters

POR

PFD

Alternate

Card

BRG

Parallel I/O Ports

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