GENERAL DESCRIPTION
The ICSI IC80C51 and IC80C31 are high-performance microcontroller fabricated using high-density CMOS technology. The CMOS IC80C51/31 is functionally compatible with the industry standard 80C51/31 microcontrollers.

FEATURES
• 80C51 based architecture
• 4K x 8 ROM (IC80C51 only)
• 128 x 8 RAM
• Two 16-bit Timer/Counters
• Full duplex serial channel
• Boolean processor
• Four 8-bit I/O ports, 32 I/O lines
• Memory addressing capability
    – 64K ROM and 64K RAM
• Program memory lock
    – Encrypted verify (32 bytes)
    – Lock bits (2)
• Power save modes:
    – Idle and power-down
• Six interrupt sources
• Most instructions execute in 0.3 µs
• CMOS and TTL compatible
• Maximum speed: 40 MHz @ Vcc = 5V
• Packages available:
    – 40-pin DIP
    – 44-pin PLCC
    – 44-pin PQFP