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AT89C51RB2

ATMEL Corporation
Part Number AT89C51RB2
Manufacturer ATMEL Corporation
Description 8-bit Microcontroller
Published Mar 23, 2005
Detailed Description Features • 80C52 Compatible – 8051 Pin and Instruction Compatible – Four 8-bit I/O Ports – Three 16-bit Timer/Counters –...
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AT89C51RB2
AT89C51RB2

Overview
Features • 80C52 Compatible – 8051 Pin and Instruction Compatible – Four 8-bit I/O Ports – Three 16-bit Timer/Counters – 256 Bytes Scratch Pad RAM – 9 Interrupt Sources with 4 Priority Levels – Dual Data Pointer • Variable Length MOVX for Slow RAM/Peripherals • ISP (In-system Programming) Using Standard VCC Power Supply • Boot ROM Contains Low Level Flash Programming Routines and a Default Serial Loader • High-speed Architecture – In Standard Mode: 40 MHz (Vcc 2.
7V to 5.
5V, both Internal and external code execution) 60 MHz (Vcc 4.
5V to 5.
5V and Internal Code execution only) – In X2 mode (6 Clocks/machine cycle) 20 MHz (Vcc 2.
7V to 5.
5V, both Internal and external code execution) 30 MHz (Vcc 4.
5V to 5.
5V and Internal Code execution only) – 16K/32K Bytes On-chip Flash Program/Data Memory – Byte and Page (128 Bytes) Erase and Write – 100K Write Cycles • On-chip 1024 Bytes Expanded RAM (XRAM) – Software Selectable Size (0, 256, 512, 768, 1024 Bytes) – 256 Bytes Selected at Reset for TS87C51RB2/RC2 Compatibility • Keyboard Interrupt Interface on Port P1 • SPI Interface (Master/Slave Mode) • 8-bit Clock Prescaler • Improved X2 Mode with Independent Selection for CPU and Each Peripheral • Programmable Counter Array 5 Channels – High-speed Output – Compare/Capture – Pulse Width Modulator – Watchdog Timer Capabilities • Asynchronous Port Reset • Full Duplex Enhanced UART • Dedicated Baud Rate Generator for UART • Low EMI (Inhibit ALE) • Hardware Watchdog Timer (One-time Enabled with Reset-out) • Power Control Modes – Idle Mode – Power-down Mode – Power-off Flag • Power Supply: – 2.
7 to 3.
6 (3V Version) – 2.
7 to 5.
5V (5V Version) • Temperature Ranges: Commercial (0 to +70°C) and Industrial (-40°C to +85°C) • Packages: PDIL40, PLCC44, VQFP44 8-bit Microcontroller with 16K/ 32K Bytes Flash AT89C51RB2 AT89C51RC2 Description The AT89C51RB2/RC2 is a high-performance Flash version of the 80C51 8-bit microcontrollers.
It contains a 16K or 32K Bytes Flash memory block for program a...


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