Features

 80C52 Compatible

 8051 Instruction Compatible

 Six 8-bit I/O Ports (64 Pins or 68 Pins Versions)

 Four 8-bit I/O Ports (44 Pins Version)

 Three 16-bit Timer/Counters

 256 Bytes Scratch Pad RAM

 9 Interrupt Sources with 4 Priority Levels

 Integrated Power Monitor (POR/PFD) to Supervise Internal Power Supply

 ISP (In-System Programming) Using Standard VCC

 Power Supply

 2048 Bytes 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)

 64K Bytes On-chip Flash Program/Data Memory

 Byte and Page (128 Bytes) Erase and Write

 100k Write Cycles 

 On-chip 1792 bytes Expanded RAM (XRAM)

 Software Selectable Size (0, 256, 512, 768, 1024, 1792 Bytes)

 768 Bytes Selected at Reset for T89C51RD2 Compatibility

 On-chip 2048 Bytes EEPROM Block for Data Storage (AT89C51ED2 Only)

 100K Write Cycles

 Dual Data Pointer

Variable Length MOVX for Slow RAM/Peripherals

 Improved X2 Mode with Independent Selection for CPU and Each Peripheral

 Keyboard Interrupt Interface on Port 1

 SPI Interface (Master/Slave Mode)

 8-bit Clock Prescaler

 16-bit Programmable Counter Array

 High Speed Output

 Compare/Capture

 Pulse Width Modulator

 Watchdog Timer Capabilities

 Asynchronous Port Reset 

 Full-duplex Enhanced UART with Dedicated Internal Baud Rate Generator

 Low EMI (Inhibit ALE)

 Hardware Watchdog Timer (One-time Enabled with Reset-Out), Power-off Flag

 Power Control Modes: Idle Mode, Power-down Mode

 Single Range Power Supply: 2.7V to 5.5V

 Industrial Temperature Range (-40 to +85°C)

 Packages: PLCC44, VQFP44, PLCC68, VQFP64

 

 

 

 

 

 

 

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