MSM64422 Datasheet, PDF (1/13 Pages) OKI electronic componets – Built-in 256/512-Bit EEPROM and LCD Driver 4-Bit Microcontroller

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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
EEPROM write voltage
Operating frequencies
Operating temperature
: 2.5 to 5.5V (crystal oscillation mode)
: 1.7 to 5.5V (RC oscillation mode)
: 2.2 to 5.5V
: f_max = 2.4 MHz (crystal oscillation mode)
: f_max = 1.2 MHz (RC oscillation mode)
: Ta=–40 to +85°C
• Memory space
<MSM64422>
ROM (program memory)
RAM (data memory)
EEPROM
<MSM64424>
ROM (program memory)
RAM (data memory)
EEPROM
: 2048 bytes
: 64 nibbles
: 64 nibbles
(Number of data rewriting cycles to EEPROM:
10,000)
(EEPROM data retaining years: 10 Years)
: 4096 bytes
: 128 nibbles
: 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
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