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MSM64422 Datasheet(PDF) 1 Page - OKI electronic componets |
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MSM64422 Datasheet(HTML) 1 Page - OKI electronic componets |
1 / 13 page 1/13 ¡ Semiconductor MSM64422/64424 ¡ Semiconductor MSM64422/64424 Built-in 256/512-Bit EEPROM and LCD Driver 4-Bit Microcontroller GENERAL DESCRIPTION The MSM64422/64424 is a low power 4-bit microcontroller using OKI original CPU core nX-4/ 20. Integrated into a single chip are 64/128 nibbles of EEPROM, PWM generation circuit, 8-bit timer counter, 8-bit synchronous serial port, time base counter, low voltage detection circuit, watchdog timer, 4-bit input port, one or two input-output port(s). For the oscillator circuit, it is possible to choose from the crystal oscillation circuit or the 3-pin RC oscillation circuit (resistor R and capacitor C are externally connected). Most suitable for small-sized security systems such as the key-less entry. FEATURES • Operating range CPU operating voltage : 2.5 to 5.5V (crystal oscillation mode) : 1.7 to 5.5V (RC oscillation mode) EEPROM write voltage : 2.2 to 5.5V Operating frequencies : fmax = 2.4 MHz (crystal oscillation mode) :fmax = 1.2 MHz (RC oscillation mode) Operating temperature : Ta=–40 to +85 °C • Memory space <MSM64422> ROM (program memory) : 2048 bytes RAM (data memory) : 64 nibbles EEPROM : 64 nibbles (Number of data rewriting cycles to EEPROM: 10,000) (EEPROM data retaining years: 10 Years) <MSM64424> ROM (program memory) : 4096 bytes RAM (data memory) : 128 nibbles EEPROM : 128 nibbles (Number of data rewriting cycles to EEPROM: 10,000) (EEPROM data retaining years: 10 Years) • Functions PWM generation circuit (each pulse width, and pulse period is set by a 4-bit counter) 8-bit timer counter (automatic reload timer) 8-bit synchronous serial port Standby functions Low voltage detection circuit built in. Watchdog timer • Interrupt sources : internal 5 sources : external 1 source E2E0039-27-Y3 This version: Jan. 1998 Previous version: Mar. 1996 |
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