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■ 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