The UPD78940xA Group is supported only for the customers who have already adopted any of the products. For new adoption, please consider other products such as RL78/L13 Group.

Main Solutions

Key Features:

  • Operating voltage: VDD = 1.8 to 5.5 V
  • Max. frequency: 5 MHz
  • ROM capacities: 12 KB to 24 KB mask ROM and 32 KB flash memory
  • RAM capacities: 512 bytes
  • 80-pin plastic QFP, LQFP package
  • Minimum instruction execution time can be changed from high speed (0.4 µs: @ 5.0 MHz operation with main system clock) to ultra low speed (122 µs: @ 32.768 kHz operation with subsystem clock)
  • I/O ports: 43
  • Serial interface channel: Switchable between 3-wire serial I/O and UART modes
  • LCD controller/driver: Up to 28 segment signal outputs, Up to 4 common signal outputs
  • Bias switchable between 1/2 and 1/3
  • A/D converters with an 8-bit resolution: 7 channels
  • Timers: 6 channels
    • 16-bit timer: 1 channel
    • 8-bit timer/event counters: 2 channels
    • 8-bit timer: 1 channel
    • Watch timer: 1channels
    • Watchdog timer


  • Vectored interrupt sources: 17
  • Operating ambient temperature: TA = -40 to +85°C


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

Title Description
My Renesas Create a My Renesas account to use our tool download services, receive e-newsletter/update notifications, and take advantage of our other services.
e-learning Information for studying and learning about microcontrollers and microprocessors.
FAQ Frequently asked questions and useful hints for development.
Forum A forum and community site to share technical information, questions and opinions with others who use Renesas products.
Video Watch videos related to this product.


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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