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UPD754144 Datasheet 4-bit Single-chip Microcontrollers

Manufacturer: NEC (now Renesas Electronics)

Overview: DATA SHEET µPD754144, 754244 4-BIT SINGLE-CHIP MICROCONTROLLERS MOS INTEGRATED.

General Description

The µ PD754244 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.

The details of functions are described in the following user’s manual.

Key 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.
  • µ PD754144: RC oscillator (external resistor and capacitor).
  • µ PD754244: Crystal/ceramic oscillator Low-voltage operation: V DD = 1.8 to 6.0 V Timer function (4 channels).
  • Basic interval timer/watchdog timer: 1 channel.
  • 8-bit timer counter : 3 chan.

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