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)