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

• uPD754144: RC oscillator (external resistor and capacitor)

• uPD754244: 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.

• uPD754144:

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

• uPD754244:

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)