GENERAL DESCRIPTION
The MSM64162A is a low power 4-bit microcontroller that employs Okis original CPU core nX- 4/20.
The MSM64162A has 2-channel RC oscillation type A/D converter, LCD driver for up to 80 segments, and buzzer output port. It is best suited for applications such as low power, high precision thermometers and hygrometers.

FEATURES
• Operating range
   Operating frequencies : 32.768 kHz, 400 kHz
   Operating voltage : 1.25 to 1.7 V (1.5 V spec.)
                               2.0 to 3.5 V (3 V spec.)
                               2.2 to 3.5 V (3 V spec., 1/2 duty)
   Operating temperature : –40 to +85°C
• Memory space
   Internal program memory : 2016 bytes
   Internal data memory : 128 nibbles
• Minimum instruction execution time : 7.5 ms @ 400 kHz
                                                        91.6 ms @ 32.768 kHz
• RC oscillation type A/D converter : 2 channels
                                                      Time division 2-channel method
• LCD driver : 24 outputs
   (1) At 1/4 duty and 1/3 bias : 80 segments (max)
   (2) At 1/3 duty and 1/3 bias : 63 segments (max)
   (3) At 1/2 duty and 1/2 bias : 44 segments (max)
   Voltage Regulator for LCD Driver (selectable by mask option)
      The LCD panel display is stable regardless of temporary supply voltage drop, because
      the voltage generated by the voltage regulator for LCD driver is supplied to the bias
      voltage generator as a reference voltage.
   LCD Operating Voltage
      When the voltage regulator for LCD driver is used
                                       : 3.6 V (Duty cycle = 1/4 or 1/3)
                                       2.4 V (Duty cycle = 1/2)
      When the voltage regulator for LCD driver is not used
                                       : 4.5 V (Duty cycle = 1/4 or 1/3)
                                       3.0 V (Duty cycle = 1/2)
• Buzzer driver : 1 output (4 output modes selectable)
• Capture circuit : 2 channels
• Watchdog timer
• Clock : 32.768 kHz crystal oscillator and 400 kHz RC
             oscillator (with an external resistor)
   CPU clock : 32.768 kHz/400 kHz (switchable by software)
   Time base clock : 32.768 kHz
• Power supply voltage : 1.5 V/3 V (selectable by mask option)
• I/O port
   Input-output port : 2 ports x 4 bits
   Input port : 1 port x 4 bits
   Output port : 1 port x 4 bits
                  (8 out of the 24 LCD driver outputs can be used
                  as output-only ports by mask option.)
• Interrupt sources
   External interrupt : 2 sources
   Internal interrupt : 7 sources
• Battery check circuit : 1 (incorporated into the input-only port)
• Package:
   80-pin plastic QFP (QFP80-P-1420-0.80-BK) : (Product name : MSM64162A-XXXGS-BK)
   Chip                                        : (Product name : MSM64162A-XXX)
                                                   XXX indicates a code number.