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DESCRIPTION

The μPD754244 is a 4-bit single-chip microcontroller which incorporates the EEPROMTM for key-less entry application.

It incorporates a 16 ×8-bit EEPROM, a 4-Kbyte mask ROM to store software, a 128 ×4-bit RAM to store the processing data, a processing CPU, and a carrier generator which easily outputs waveforms for infrared remote controller.

FEATURES

? On-chip EEPROM: 16 ×8 bits (mapped to the data memory)

? On-chip key return reset function for key-less entry

? System clock oscillation circuit

? μPD754144: RC oscillator (external resistor and capacitor)

? μPD754244: Crystal/ceramic oscillator

? Low-voltage operation: VDD= 1.8 to 6.0 V

? Timer function (4 channels)

? Basic interval timer/watchdog timer: 1 channel

? 8-bit timer counter : 3 channels

? On-chip memory

? Program memory (ROM) 4096 ×8 bits

? Data memory (static RAM) 128 ×4 bits

? Instruction execution time variable function suited for power saving.

? μPD754144:

4, 8, 16, 64 μs (at fcc = 1.0-MHz operation)

? μPD754244:

0.95, 1.91, 3.81, 15.3 μs (at fx = 4.19-MHz operation)

0.67, 1.33, 2.67, 10.7 μs (at fx = 6.0-MHz operation)

APPLICATIONS

Automotive appliances such as key-less entry, compact data carrier, etc.