GENERAL DESCRIPTION

The MSM64162 is a low power 4-bit microcontroller that employs Okis original CPU core nX-4/20.

The MSM64162 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

• LCD driver : 24 outputs; duty ratio switchable by software

(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)

• 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 options:

64-pin plastic QFP (QFP64-P-1420-1.00-BK) : (Product name : MSM64162-XXXGS-BK)

80-pin plastic QFP (QFP80-P-1420-0.80-BK) : (Product name : MSM64162-XXXGS-BK-F)

Chip : (Product name : MSM64162-XXX)

XXX indicates a code number.