AT80C51RD2

Features:

• 80C52 Compatible
Four 8-bit I/OPorts
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



Pinout




Description

AT80C51RD2 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 AT80C51RD2 retain all features of the Atmel 80C52 with 256 bytes of internal RAM, a 7-source 4-level interrupt controller and three timer/counters. In addition, the microcontrollers have a Programmable Counter Array, an XRAM of 1024 byte, a Hardware Watchdog Timer, a Keyboard Interface, a more versatile serial channel that facilitates multiprocessor communication (EUART) and a speed improvement mechanism (X2 mode).

The microcontrollers AT80C51RD2 have 2 software-selectable modes of reduced activity and 8 bit clock prescaler for further redu-ction in power consumption. In Idle mode, the CPU is frozen while the peripherals and the interrupt system are still operating. In the Powerdown mode, the RAM is saved and all other functions are inoperative.