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1 / 40 page 1/40 ¡ Semiconductor MSM64162A ¡ Semiconductor MSM64162A 4-Bit Microcontroller with Built-in RC Oscillation Type A/D Converter and LCD Driver GENERAL DESCRIPTION The MSM64162A is a low power 4-bit microcontroller that employs Oki's 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) E2E0049-18-95 This version: Sep. 1998 |
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