CMOS SINGLE-CHIP 8-BIT MICROCONTROLLER

The 80C39/80C49 is a high-performance microcontroller fabricated with high-density CMOS technology.
The 80C49 contains a 2k x 8 ROM , a 128 x 8 RAM , 27 I/O lines, 8-bit counter/timers, a two-source, one level interrupt structure, and on-chip oscillator and clock circuits.
The device has two modes of power reduction  idle mode and power-down mode. The idle mode freezes the CPU while allowing the RAM, timer, and interrupt system to continue functioning. The power-down mode saves the RAM contents but freezes the oscillator, causing all other chip functions to be inoperative.

FEATURES
8039/8049 compatible (MCS-48 family)
   ―2k x 8 ROM (80C49)
   ―ROMless (80C39)
   ―128 x 8 RAM
   ―8-bit counter/timers
• Memory addressing capability
   ―4k ROM and 4k RAM
• Power control modes:
   ―Idle mode
   ―Power-down mode
• CMOS and TTL compatible
• Speed range at VCC=5V
   ―8 MHz
• Fully static design operation from DC to 8MHz
• Single step input