AT80C51RD2

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 AT80C51RD2 ROMless Versions On-Chip 1024 bytes Expanded RAM (XRAM) – Software Selectable Size (0, 256, 512, 768, 1024 bytes) – 256 Bytes Selected at Reset 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 Temperature Ranges: Commercial (0 to +70°C) and Industrial (-40°C to +85°C) Packages: PDIL40, PLCC44, VQFP44 80C51 High Performance ROM 8-bit Microcontroller AT80C51RD2 1. Description AT80C51RD2 microcontrollers are high performance versions of the 80C51 8-bit microcontrollers. The microcontrollers retain all features of the Atmel 80C52 with 256 bytes of internal RAM, a 7source 4-level interrupt controller and three timer/c...