■ OUTLINE

The MB89890 series is a line of single-chip microcontrollers containing a great variety of peripheral functions such as dual clock control systems, 4-stage operating speed controller, DTMF signal generator, timer, PWM timer, serial interface, modem, A/D converter and external interrupt, as well as compact instruction set.

■ FEATURES

• F2MC-8L family CPU core

• Dual clock control system

• Maximum memory size: 64 Kbytes

• Minimum execution time: 0.5 µs at 8 MHz

• Interrupt processing time: 4.5 µs at 8 MHz

• I/O ports: max. 85 ports

• 21-bit time-base counter

• 8-bit PWM timer

• DTMF generator

• 8/16-bit timer

• 8-bit serial I/O

• Serial I/O with 1-byte buffer

• A/D converter

• Modem timer (pulse-width counter)

• Modem signal output

• External interrupt: 16 channels

• Power-on reset function

• Low-power consumption modes (subclock mode, watch mode, sleep mode, stop mode)

• CMOS technology