■ 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