DESCRIPTION
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.

FEATURES
• 80C51 based architecture
   – 4k × 8 ROM
   – 128 × 8 RAM
   – Two 16-bit counter/timers
   – Full duplex serial channel
   – Boolean processor
• Non-volatile 256 × 8-bit EEPROM(electrically erasable programmable read only memory)
   – On-chip voltage multiplier for erase/write
   – 10,000 erase/write cycles per byte
   – 10 years non-volatile data retention
   – Infinite number of read cycles
   – User selectable security mode
   – Block erase capability
• Mask-programmable ROM code protection
• Memory addressing capability
   – 64k ROM and 64k RAM
• Power control modes:
   – Idle mode
   – Power-down mode
• CMOS and TTL compatible
• 1.2 to 16MHz or 3.5 to 24MHz
• Three package styles
• Three temperature ranges
• ROM code protection