The µPD784031 is a product of the µPD784038 sub-series in the 78K/IV series. It contains various peripheral hardware such as RAM, I/O ports, 8-bit resolution A/D and D/A converters, timers, serial interface, and interrupt functions, as well as a high-speed, high-performance CPU.
The µPD784031 is a ROM-less product of the µPD784035 and µPD784036.

FEATUREs
• Pin-compatible with the µPD78234, µPD784026, and µPD784038Y sub-series
• Minimum instruction execution time: 125 ns (at 32 MHz)
• Number of I/O ports: 46
• Serial interface: 3 channels
  UART/IOE (3-wire serial I/O): 2 channels
  CSI (3-wire serial I/O, 2-wire serial I/O): 1 channel
• PWM outputs: 2
• Timer/counters
  16-bit timer/counter ×3 units
  16-bit timer ×1 unit
• Standby function
  HALT/STOP/IDLE mode
• Clock frequency division function
• Watchdog timer: 1 channel
• A/D converter: 8-bit resolution ×8 channels
• D/A converter: 8-bit resolution ×2 channels
• Power supply voltage: VDD= 2.7 to 5.5 V