AT89C51RB2
Overview
The AT89C51RB2/RC2 is a high-performance Flash version of the 80C51.
- 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 - 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) - 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
