GENERAL DESCRIPTION
The MSM64167E is a low power 4-bit microcontroller that employs Oki's original CPU core nX-
4/20.
The MSM64167E contains a dual-slope type A/D converter with a 4-channel input, LCD driver for up to 108 segments, and buzzer output port. The MSM64167E is best suited for applications such as low power, high precision thermometers, barometers, and hygrometers.

FEATURES
• Operating range
   Operating frequencies : 32.768 kHz, 700 kHz
   Operating voltage : 2.6 to 3.6 V
   Operating temperature : –40 to +85°C
• Memory space
   Internal program memory : 4064 bytes
   Internal data memory : 256 nibbles
• Minimum instruction execution time : 4.3 ms @ 700 kHz
                                                   91.6 ms @ 32.768 kHz
• Dual-slope type A/D converter : 4-channel input
• LCD driver : 31 outputs; duty ratio switchable by software
   (1) At 1/4 duty and 1/3 bias : 108 segments (max)
   (2) At 1/3 duty and 1/3 bias : 84 segments (max)
   (3) At 1/2 duty and 1/2 bias : 58 segments (max)
• Buzzer driver : 1 output (4 output modes selectable)
• Timer : 16-bit x 1
    Auto-reload mode
    Capture mode
    Clock frequency measuring mode
• Watchdog timer
• Clock : 32.768 kHz crystal oscillator and 700 kHz RC
                                    oscillator (with an external resistor)
CPU clock : 32.768 kHz/700 kHz (switchable by software)
Time base clock : 32.768 kHz
• Power supply voltage : 3V
• I/O port
   Input-output port : 3 ports x 4 bits
   Output port : 2 ports x 4 bits
                   (8 out of the 31 LCD driver outputs can be used as output-only ports by mask option.)
• Serial port : Synchronous/asynchronous mode support
   Synchronous mode : 32.768 kHz/external clock
   Asynchronous mode : 9600 bps/4800 bps/2400 bps/1200 bps