GENERAL DESCRIPTION

The MSM64481 is a 4-bit microcontroller with built-in EEPROM that incorporates OKIs nX-4s CPU core. The device contains a 2K-byte ROM, 128-nibble RAM, 128-nibble EEPROM, 1/2 duty LCD driver, time base counter, watchdog timer, low voltage detection circuit, seven interrupt sources, one 3-bit input port, two 4-bit input/output ports, and 500 kHz RC oscillator circuit (with an external capacitor C).

FEATURES

• Operating range

Operating frequency : 200 kHz to 1 MHz

Operating voltage : 3 to 6 V

Operating temperature : –40 to +85°C

• Internal program memory : 2048 bytes

• Internal data memory : 128 nibbles

• Built-in EEPROM : 128 nibbles

• Interrupt sources : 6 (3 internal, 3 external)

• Minimum instruction execution time : 6 ms (@ 500 kHz)

• I/O Port

Input-output port : 2 ports x 4 bits

Input port : 1 port x 3 bits

• 1/2 duty LCD driver

Segment drivers : 40

Common drivers : 2

• Built-in watchdog timer

• CPU operating voltage : 3.0 to 5.5 V

• EEPROM writable operating voltage : 4.5 to 5.5 V

• LCD display operating voltage : 3.0 to 6.0 V

• Package options

60-pin plastic QFP (QFP60-P-1519-1.00-K) : (Product name: MSM64481-014GS-K)

56-pin plastic QFP (QFP56-P-910-0.65-2K) : (Product name: MSM64481-014GS-2K-H)