The GR-KURUMI board incorporates the 16-bit, low-power consumption, RL78/G13 Group MCU (R5F100GJAFB). Compatible with Arduino Pro Mini, this board can use existing sample codes, ensuring easy use with the Arduino language and standard libraries from both hardware and software aspects.

Key Features

The following special features, unavailable in Arduino Pro Mini, are perfect for designing small and low-power gadgets.

  • Runs on a single-battery. Incorporates a voltage booster from 0.9V to 3.3V (or 5V)
  • Includes a real-time clock with alarm function, facilitating a high-precision real-time counter (RTC)
  • Low-power mode: Arduino-like library allows for easy setup of the RL78 standby mode (STOP/SNOOZE)
  • GR-KURUMI's LED hair accessories: Unique GR-KURUMI features are illustrated in LEDs with glowing full-color hair accessories


Detailed Specification

RL78/G13 (R5F100GJAF B 48-pin QFP)
Data Flash
32MHz (internal XO)
Sub Clock
Operating Voltage
2.7V to 5.5V (Note)

Note: MCU operates from 1.6V. To ensure Arduino Pro Mini compatibility, the board offers a minimum 2.7V operation.

Project File for e2 studio

Project file for sketching in Eclipse-based development environment e2 studio. For downloading and installing e2 studio, please refer to the e2 studio product page.

Note: This is a project exported in e2 studio Version 7.2.

Technical Support

Technical Information

  • User Forum
    This is the Gadget Renesas User Forum on In this forum space, you can find many showpiece applications using GR boards, as well as sample applications and programs. Post your questions and your showpiece here.
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Related Websites

GR-KURUMI Board Distributor