The RL78/G23-64p Fast Prototyping Board is an evaluation board based on the RL78/G23 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 Grove interfaces, and has high scalability with access to all pins on the microcontroller. This product also supports writing programs with the Arduino IDE.


  • Equipped with an RL78/G23 16-bit microcontroller (64-pin, ROM: 128KB, RAM: 16KB)
  • 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
  • Standard Arduino Uno and Grove interfaces
  • Arduino IDE ready
  • Support for various RL78 software and tools



Design & Development

Software & Tools

Software & Tools

Software title
Software type
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
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
2 items

Software Downloads

Type Title Date
Board Description File ZIP 1 KB
PCB Design Files ZIP 2.97 MB
PCB Design Files PDF 168 KB
3 items

Sample Code

Related Boards & Kits

Boards & Kits

AI Coding with Chat-GPT for RL78 Microcontroller (Arduino)

This video introduces how to do AI coding using ChatGPT and the RL78 Arduino-compatible board, including practical examples such as lighting up a 7Seg LED, rotating a motor, and sensing with a temperature and humidity sensor. Even beginners can easily experience AI coding!

Detailed step-by-step instructions:

AI Coding with Chat-GPT for RL78 Microcontroller (Arduino) | Renesas


Related products: RL78/G23-64p FPB

Related sources: Quick Start Guide page (GitHub)



1. Informational Purposes Only: This video serves as a general guide to using ChatGPT/GPT-4 to write code for an Arduino RL78 evaluation board. Renesas does not guarantee the accuracy or completeness of the content provided.

2. Third-Party Rights Infringement: Note that code generated using ChatGPT/GPT-4 might potentially infringe third-party intellectual property rights. Renesas makes no representations or warranties that the use of ChatGPT/GPT-4 will not violate any third-party rights. Users are urged to exercise due diligence to ensure compliance with applicable laws and third-party rights.

3. No Liability: In no event shall Renesas be liable for any damages, data loss, or other adverse consequences that may occur as a result of using the information, code, techniques, or tools demonstrated in this video. You may want to apply industry standard static and dynamic code assessments as AI code has been recognized to possibly contain malware fragments as well as deriving other unwanted outcomes.