GENERAL DESCRIPTION

The ISSI IS89C51 is a high-performance microcontroller fabricated using high-density CMOS technology. The CMOS IS89C51 is functionally compatible with the industry standard 80C51 microcontrollers.

The IS89C51 is designed with 4-Kbytes of Flash memory, 128 x 8 RAM; 32 programmable I/O lines; a serial I/O port for either multiprocessor communications, I/O expansion or full duplex UART; two 16-bit timer/counters; an six-source, two-priority-level, nested interrupt structure; and an on-chip oscillator and clock circuit. The IS89C51 can be expanded using standard TTL compatible memory.

FEATURES

? 80C51 based architecture

? 4-Kbytes of on-chip Reprogrammable Flash Memory

? 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

– Lock bits (3)

? 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

? Industrial temperature available

? Packages available:

– 40-pin DIP

– 44-pin PLCC

– 44-pin PQFP