FEATURES
● 80C52 Compatible – 8051 pin and instruction compatible – Four 8-bit I/O ports + 2 I/O I2C Interface pins – Three 16-bit timer/counters – 256 bytes scratch pad RAM – 10 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 – 40 MHz in standard mode – 20 MHz in X2 mode (6 clocks/machine cycle) 32-Kbytes on-chip FLASH program / data Memory – Byte and page (128 bytes) erase and write – 10k write cycles – On-chip 1024 bytes expanded RAM (XRAM) – Software selectable size (0, 256, 512, 768, 1024 bytes) – 256 bytes selected at reset for T87C51RB2/RC2 compatibility Keyboard interrupt interface on port P1 400-Kbits/s Multimaster I 2C Interface SPI Interface (Master / Slave Mode) Sub clock 32kHz crystal oscillator 8-bit clock prescaler Improved X2 mode with independant...
Atmel
