AT89C51RB2解密

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    AT89C51RB2　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 and data.The Flash memory can be programmed either in parallel mode or in serial mode with the ISP capability or with software. The programming voltage is internally generated from the standard VCC pin.The AT89C51RB2/RC2 retains all features of the 80C52 with 256 Bytes of internal RAM, a 9-source 4-level interrupt controller and three timer/counters.
　　AT89C51RB2　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
　　– 48 MHz in Standard Mode and Internal Code Execution (40 MHz for external code)
　　– 24 MHz in X2 Mode and internal code execution (20 MHz for external code)
　　– 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