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Description

T89C51RD2 is high performance CMOS Flash version of the 80C51 CMOS single chip 8-bit microcontroller. It contains a 64 Kbytes Flash memory block for program and for data.

The 64 Kbytes Flash memory can be programmed either in parallel mode or in serial mode with the ISP capability or with software. The programming voltage is internally generated from the standard VCC pin.

The T89C51RD2 retains all features of the ATMEL 80C52 with 256 bytes of internal RAM, a 7-source 4-level interrupt controller and three timer/counters.

Features

? 80C52 Compatible

¨C 8051 Pin and Instruction Compatible

¨C Four 8-bit I/O Ports (or 6 in 64/68 Pins Packages)

¨C Three 16-bit Timer/Counters

¨C 256 bytes Scratch Pad RAM

¨C 7 Interrupt Sources With 4 Priority Levels

? ISP (In-System Programming) Using Standard VCC Power Supply

? Boot Flash Contains Low Level Flash Programming Routines and a Default Serial Loader

? High-Speed Architecture

¨C40 MHz in Standard Mode

¨C20 MHz in X2 Mode (6 Clocks/Machine Cycle)

? 64K bytes On-chip Flash Program/Data Memory

¨CByte and Page (128 bytes) Erase and Write

¨C100K Write Cycles

? On-chip 1024 Bytes Expanded RAM (XRAM)

¨CSoftware Selectable Size (0, 256, 512, 768, 1024 bytes)

¨C768 Bytes Selected at Reset for T87C51RD2 Compatibility

? Dual Data Pointer Variable Length MOVX for Slow RAM/Peripherals

? Improved X2 Mode with Independant Selection for CPU and Each Peripheral

? 2K bytes EEPROM Block for Data Storage

¨C100K Write Cycle

? Programmable Counter Array with

¨CHigh Speed Output

¨CCompare/Capture

¨CPulse Width Modulator

Watchdog Timer Capabilities

Asynchronous Port Reset

Full-duplex Enhanced UART

Low EMI (Inhibit ALE)

¨CHardware Watchdog Timer (One-time Enabled with Reset-out)

? Power Control Modes:

¨CIdle Mode

¨CPower-down Mode

? Power Supply:

¨CM version: Commercial and Industrial

4.5V to 5.5V: 40 MHz (X1 Mode), 20 MHz (X2 Mode)

3V to 5.5V: 33 MHz (X1 Mode), 16 MHz (X2 Mode)

¨CL version: Commercial and industrial

2.7V to 3.6V: 25 MHz (X1 Mode), 12 MHz (X2 Mode)

? Temperature Ranges: Commercial (0 to +70¡ãC) and Industrial (-40 to +85¡ãC)

? Packages: PDIL40, PLCC44, VQFP44, PLCC68, VQFP64