Description

AT8xC51Rx2 microcontrollers are high performance ROM versions of the 80C51 8-bit microcontrollers. They contain a 0K, 16K or 32K bytes ROM memory block for program.

The microcontrollers retain 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

– Four 8-bit I/O Ports

– Three 16-bit Timer/Counters

– 256 Bytes Scratch Pad RAM

– 8 Interrupt Sources with 4 Priority Levels

– Dual Data Pointer

? Variable Length MOVX for Slow RAM/Peripherals

? High-speed Architecture

– 10 to 40 MHz in Standard Mode

? 16K/32K Bytes On-Chip ROM Program

? T80C51RD2 ROMless Versions

? On-Chip 1024 bytes Expanded RAM (XRAM)

– Software Selectable Size (0, 256, 512, 768, 1024 bytes)

– 256 Bytes Selected at Reset for AT87C51RB2/RC2 Compatibility

? Keyboard Interrupt Interface on Port P1

? 8-bit Clock Prescaler

? 64K Program and Data Memory Spaces

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

? Programmable Counter Array 5 Channels with:

– 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: 2.7V to 5.5V or 2.7V to 3.6V

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

? Packages: PDIL40, PLCC44, VQFP44