The UPD78023x microcontroller is 8-bit microocntroller for VFD control.

Key Features:

  • Operating voltage: VDD = 4.5 to 5.5 V
  • Max. frequency: 5 MHz
  • ROM capacities: 16 - 24 KB mask ROM, 24 KB flash mmeory
  • RAM capacities: 768 bytes
  • Package: 80-pin plastic QFP (14 x 14)
  • Minimum instruction execution time changeable from high speed (0.4 µs) to low speed (6.4 µs)
  • I/O port: 40 pins
  • VFD controller/driver: Total display output pins: 53 (universal grid compatible)
    • Display current 15 mA: 20 pins
    • Display current 5 mA: 33 pins


  • 8-bit resolution A/D converter: 4 channels (Supply voltage AVDD = 4.5 to 5.5 V)
  • Serial interface: 2 channels
    • 3-wire serial mode (with automatic transmit/receive function): 1 channel
    • 2-wire serial mode (transmission only): 1 channel


  • Timer: 4 channels
    • 8-bit remote control timer: 1 channel
    • 8-bit timer: 2 channels
    • Watchdog timer: 1 channel


  • Vectored interrupt source: 14


Pin Count / Memory Size Lineup:

Below you will find information to support the development of your application.
You can find an explanation of orderable part numbers here.


Resources for Software and Hardware

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e-learning Information for studying and learning about microcontrollers and microprocessors.
FAQ Frequently asked questions and useful hints for development.
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Hardware Design Support

Title Description
Characteristics data Information on observed values. Please use this as reference data when developing your set.


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