The RL78/G22 Fast Prototyping Board is an evaluation board based on the RL78/G22 microcontroller and is specifically designed for prototyping various applications. Simply plug in a USB cable to write/debug a program and start your evaluation without any additional tools. You can also perform advanced debugging using the E2 emulator Lite or the traditional E2 emulator. The board comes standard with Arduino Uno and Pmod™ interfaces, and has high scalability with access to all pins on the microcontroller. It is equipped with two touch buttons and one slider utilizing a capacitive sensor unit, which is one of the features of the RL78/G22.


  • Equipped with an RL78/G22 16-bit microcontroller (48-pin, ROM: 64KB, RAM: 4KB)
  • Programs can be written and debugged via the COM Port communication by connecting it to a PC with a USB cable
  • Able to access all the microcontroller pins
  • Comes standard with Arduino Uno, Pmod™ and Grove interfaces
  • Equipped with capacitive touch sensor buttons
  • Support for various RL78 software and tools



Design & Development

Software & Tools

Software & Tools

Software title
Software type
E2 emulator [RTE0T00020KCE00000R]
On-chip debugging emulator. Also available as a flash memory programmer. [Support MCU/MPU: RA, RE, RH850, R-Car D1, RL78, RX, RISC-V MCU]
Emulator Renesas
E2 emulator Lite [RTE0T0002LKCE00000R]
On-chip debugging emulator. Also available as a flash memory programmer. [Support MCU/MPU: RA, RE, RL78, RX, RISC-V MCU]
Emulator Renesas
2 items

Software Downloads

Type Title Date
Board Description File ZIP 1 KB
1 item

Sample Code

RL78 Family Secondary Device OTA Update Solution

This video will show the steps to operate the secondary device OTA firmware update solution via primary device with the AWS Cloud, tailored for low-end microcontrollers lacking direct internet connectivity.

The evaluation environment uses Renesas' RL78/G22 Fast Prototyping Board and Cloud Kit Based on RX65N (CK-RX65N).

News & Blog Posts