80C851/83C851 CMOS Single-chip 8-bit Microcontroller With On-chip EEPROM

The Philips 80C851 83C851 is a high-performance Microcontroller fabricated with Philips high-density CMOS technology. The 80C851 83C851 has the same instruction set as the 80C51. The Philips CMOS technology combines the high speed and density characteristics of HMOS with the low power attributes of CMOS. The Philips epitaxial substrate minimizes latch-up sensitivity. The 80C851 83C851 contains a 4k , 8 ROM with mask-programmable ROM code protection, a 128 , 8 RAM, 256 , 8 EEPROM 32 I/O lines, two 16-bit Counter Timers a seven-source, five vector, two-priority level nested interrupt structure, a serial I/O port for either multi-processor Communications I/O expansion or full duplex UAR, and on-chip Oscillator and Clock circuits. In addition, the 80C851 83C851 has two software selectable modes of power reduction - idle mode and power-down mode. The idle mode freezes the CPU while allowing the RAM, Timers serial por, and interrupt system to continue functioning. The power-down mode saves the RAM and EEPROM contents but freezes the Oscillator causing all other chip functions to be inoperative.
By NXP Semiconductors