Overview
Description
The RL78/L23 Fast Prototyping Board, featuring the RL78/L23 MCU, is ideal for various prototype development. This board has a USB-UART converter for COM port debug function, enabling programming and debugging without extra tools. It includes an LCD panel (8 digits x 16 segments) and two touch buttons, thus you can start evaluation of the LCD and capacitive touch immediately. In addition, it has high flexibility and expandability by supporting Arduino Uno, Pmod™, Grove interfaces, and through-holes with access to all MCU pins. It supports firmware updating, Wi-Fi, LoRa, and LoRaWAN-based wireless communication by sample code. Renesas also provides an Arduino library that supports creating various programs (sketches) on the Arduino IDE.
Note: This board comes with two touch buttons using a capacitive sensor unit for simple evaluation, but when designing an actual board, please check the Capacitive Sensor Microcontrollers CTSU Capacitive Touch Electrode Design Guide (R30AN0389) and use the Capacitive Touch Evaluation System for RL78/L23 (RSSK-RL78L23) for evaluation.
Features
- Equipped with an RL78/L23 16-bit microcontroller (R7F100LPL3CFB)
- 32MHz, RL78-S3 Core
- ROM: 256KB x 2 banks, RAM: 32KB, Data Flash 8KB
- 100-pin LFQFP, 14mm x 14mm x 1.7mm, 0.5mm pitch
- 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 and Pmod™
- Arduino library available
- Equipped with LCD panel and capacitive touch sensor buttons
- Support for various RL78 software and tools
Applications
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Smart Touch Panel
Smart touch panel with low-power MCU enables real-time air quality, temperature, and touch control.
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Toaster Kettle Grill with Digital Controls
This system enables faster, precise cooking with intuitive touch controls and display.
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Corded Stand Blender with Digital Controls
Smart blender system with an intuitive UI and efficient motor control powered by an integrated MCU.
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Induction Heating Rice Cooker
Smart IH rice cooker with precise temperature control, compact MCU, and energy-efficient design.
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LoRaWAN Gas Meter
LoRaWAN network enables automatic, efficient gas meter shutdown with low power and long-range benefits.
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Power System for Smart Power Meter with 4G Module
Smart power meter system ensures always-on operation with efficient energy use.
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Documentation
Featured Documentation
Log in required to subscribe
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| Type | Title | Date |
| Manual - Development Tools |
PDF
6.51 MB
日本語
The RL78/L23 Fast Prototyping Board (FPB-RL78L23 / RTK7RLL230S00001BJ) is an evaluation board for the Renesas RL78/L23 MCU. This manual describes hardware specifications, switch configuration methods, and initial setup procedures to help users quickly get started with prototyping and testing.
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| Quick Start Guide |
PDF
195 KB
The RL78/L23 Fast Prototyping Board (FPB-RL78L23/RTK7RLL230S00001BJ) is designed for evaluating the RL78/L23 MCU. This quick start guide provides an overview, initial setup instructions, and explains key component configurations. It also illustrates how to use various functions via the board layout diagram.
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| Schematic | PDF 1.61 MB | |
| Other | PDF 60 KB | |
| Application Note |
PDF
4.94 MB
日本語
By using the module, users can easily incorporate firmware update functionality and secure boot functionality into their applications. The firmware update module provides middleware that functions as a component when adding firmware update functionality to the user's system.
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| Application Note |
PDF
6.04 MB
日本語
This sample program uses the bank swap feature of RL78/L23 to perform bank swapping. It writes different programs to Bank 0 and Bank 1 in advance on RL78/L23 Fast Prototyping Board (FPB-RL78/L23). During program execution, the user presses and holds a switch to trigger the bank swap. The program changes, and the system confirms the bank switch.
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| Application Note |
PDF
4.16 MB
日本語
This sample program uses the LCD controller/driver and capacitive sensor unit built into RL78/L23 to display the target temperature on FPB-RL78/L23, assuming a temperature setting device. The user sets the target temperature using touch buttons.
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| Application Note | PDF 2.31 MB 日本語 | |
| Application Note |
PDF
286 KB
The Combination of Private LoRa and LoRaWAN Stack is a sample software that can switch the LoRaWAN and the Private LoRa wireless communications dynamically. This document describes the specification and usage of the sample software.
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| Application Note |
PDF
579 KB
The LoRaWAN stack supports LoRaWAN interface which implements LoRaWAN protocol (Class A/B/C) specified in the specification version 1.0.4 and 1.0.3 which encompasses version 1.0.2. This document describes the API references and other information to use the LoRaWAN stack.
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| Application Note |
PDF
490 KB
The LoRaWAN stack supports LoRaWAN interface which implements LoRaWAN protocol (Class A/B/C) specified in the specification version 1.0.4 and 1.0.3 which encompasses version 1.0.2. This document describes a sample software to control the LoRaWAN stack by AT command sets.
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| Application Note |
PDF
482 KB
The Private LoRa stack supports a custom protocol for the LoRa-based wireless communication, which can be mainly used for the peer-to-peer and star network. This document describes the API references and other information to use the Private LoRa stack.
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| Application Note |
PDF
493 KB
The Private LoRa stack supports a custom protocol for the LoRa-based wireless communication, which can be mainly used for the peer-to-peer and star network. This document describes a sample software to control the Private LoRa stack by AT command sets.
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| Application Note |
PDF
651 KB
The LoRaWAN Sensor Demo package includes sample software that introduces how to visualize sensor data transmitted by a sensor node to Cloud (AWS/Azure) via LoRaWAN networks. This document describes the specification and usage of the sample software.
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| Application Note |
PDF
2.01 MB
This LoRa-based wireles softwar package includes the sample software and evaluation tools to develop the LoRa and LoRaWAN based applications.This document describes the information on the contents of this package and how to setup the hardware and software.
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| Application Note |
PDF
1.55 MB
The LoRaWAN FUOTA (Firmware Update Over The Air) provides a function to remotely update a firmware over the wireless communication. The LoRa Alliance standardized the FUOTA process utilizing the application layer protocols on top of the LoRaWAN protocol. This document describes a sample application to update a firmware over LoRaWAN.
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| Application Note |
PDF
411 KB
The Radio Driver supports basic wireless communictions such as transmit and receive frames with LoRa-based modulation and (G)FSK modulation. This document is an API reference guide for the Radio Driver and MCU timer driver.
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| Application Note |
PDF
430 KB
The support functions for regional radio regulations can be used for the Radio Driver to comply with the regional radio regulations. This document describes the support functions and how to configure each support function.
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| Application Note |
PDF
426 KB
The Radio Evaluation Program can be used when to evaluate the characteristics of the board utilizing the LoRa-based transceiver. This document describes the specification and usage of the Radio Evaluation Program.
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| Application Note |
PDF
1.15 MB
The RL78 Smart Configurator can automatically generate the driver programs to configure the peripherals, pins, interrupts, and clocks. This document describes the information on how to use the Smart Configurator for LoRa-based wireless software.
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| Application Note |
PDF
3.13 MB
日本語
This sample program uses the LCD controller/driver and capacitive sensor unit built into RL78/L23 to display a clock on RL78/L23 Fast Prototyping Board (FPB-RL78/L23).The user sets the time using touch buttons.
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| Application Note |
PDF
419 KB
日本語
Learn about IH control using the 16-bit timers KB40, KB41, and KB42 on the RL78/L23 microcontroller. The 16-bit timers KB40, KB41, and KB42 are capable of generating PWM output suitable for IH control. Each timer includes a timer restart function, which allows the output to automatically restart in synchronization with external signals, and an IH control PWM output function, which disables restarts during a predefined active period to ensure a stable output pulse width.
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| Manual - Software | PDF 370 KB | |
| Manual - Software | PDF 1.86 MB | |
| PCB Design Files | RL78/L23 Fast Prototyping Board Design Package
The design files for the RL78/L23 Fast Prototyping Board (FPB-RL78L23) include the circuit diagram, bill of materials (BOM), printed circuit board (PCB) layout files, and Gerber data, providing essential resources for evaluation and development.
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| Report | PDF 187 KB 日本語 | |
26 items
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Design & Development
Software & Tools
Software & Tools
| Software title
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Software type
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Company
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| QE for Capacitive Touch: Development Assistance Tool for Capacitive Touch Sensors In developing embedded system using the capacitive touch sensor of MCUs, you can easily setup initial configurations of the touch interface as well as process the tuning of sensors, and reduce development time. [Plugin for Renesas IDE "e2 studio"] [Standalone Version] [Support MCU/MPU:RA, RL78, RX, Renesas Synergy™]
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Solution Toolkit | Renesas |
| QE for Segment LCD: Development Assistance Tool for Segment LCD This development assistance tool supports the creation of display pattern and checking the wiring states which are required in the development of embedded systems that involve the use of segment LCDs.
This product is available free of charge.
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Solution Toolkit | Renesas |
| e² studio - information for RL78 Family Eclipse-based Renesas integrated development environment (IDE).
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IDE and Coding Tool | Renesas |
| CS+ Renesas integrated development environment (IDE) [Support MCU/MPU: RH850, V850, RX, RL78, 78K0R, 78K0]
(Note: CS+ is not generally promoted to U.S. and European customers.)
(Note: To use Smart Configurator on CS+ for RL78/G23 and RX family MCUs, install the Smart Configurator for each MCU family separately downloading from ”Design & Support” > ”Development Tools” > ”Smart Configurator”)
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IDE and Coding Tool | Renesas |
| C Compiler Package for RL78 Family [CC-RL] C Compiler Package for RL78 Family [IDE: CS+, e² studio]
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Compiler/Assembler | Renesas |
| IAR Embedded Workbench for Renesas RL78 IAR Embedded Workbench provides extensive support for RL78 devices. IAR Embedded Workbench is a complete set of development tools with leading optimization technology for creating powerful automotive applications.
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IDE and Coding Tool | IAR Systems |
| Renesas IAR Embedded Workbench Device-Support-Packages Renesas IAR Embedded Workbench Device-Support-Packages include all device-specific files to be used with the Embedded Workbench IDE.
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IDE and Coding Tool | 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]
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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]
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Emulator | Renesas |
9 items
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Sample Code
Sample Code
Filters
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| Type | Title | Date Date |
| Sample Code | RL78/G22, RL78/G23, RL78/G24, RL78/L23 Firmware Update Module Rev.2.05 - Sample Code
[Toolchains=CC-RL|V1.16.00;LLVM for Renesas RL78|17.0.1.202512;IAR Compiler for RL78|v.5.20.2]
ZIP
42.00 MB
Application:
Consumer Electronics
Compiler:
CC-RL, ICCRL78, LLVM for Renesas RL78
Function:
Driver or Library
IDE:
e2 studio, IAR EWRL78
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| Sample Code | RL78/L23 Bank swapping demo Rev.1.11
[Toolchains=CC-RL|V1.50.01;IAR Embedded Workbench for RL78|V5.20.1]
ZIP
45.14 MB
日本語
Compiler:
CC-RL, ICCRL78
Function:
Memory, Other peripherals
IDE:
CS+ for CC, e2 studio, IAR EWRL78
This sample program uses the bank swap feature of RL78/L23 to perform bank swapping. It writes different programs to Bank 0 and Bank 1 in advance on RL78/L23 Fast Prototyping Board (FPB-RL78/L23). During program execution, the user presses and holds a switch to trigger the bank swap. The program changes, and the system confirms the bank switch.
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| Sample Code | RL78/L23 LCD display (Temperature display demo) Rev.1.11
[Toolchains=CC-RL|V1.50.01;IAR Embedded Workbench for RL78|V5.20.1]
ZIP
24.54 MB
日本語
Compiler:
CC-RL, ICCRL78
Function:
Other peripherals
IDE:
CS+ for CC, e2 studio, IAR EWRL78
This sample program uses the LCD controller/driver and capacitive sensor unit built into RL78/L23 to display the target temperature on FPB-RL78/L23, assuming a temperature setting device. The user sets the target temperature using touch buttons.
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| Sample Code | RL78/G23, RL78/G22, RL78/L23, RL78/G14 LoRaWAN® Sensor Demo Rev.2.90
[Software:RL78 Smart Configurator|V1.15.0] ,[Toolchains=CC-RL|V1.15.01]
ZIP
4.01 MB
Application:
Appliances, Building Automation, Communications Infrastructure, Connected Home & Entertainment, Industrial, Industrial Automation, Security
Compiler:
CC-RL
Function:
Software Package
IDE:
CS+ for CC, e2 studio
The LoRaWAN Sensor Demo package includes sample software that introduces how to visualize sensor data transmitted by a sensor node to Cloud (AWS/Azure) via LoRaWAN networks. This document describes the specification and usage of the sample software.
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| Sample Code | RL78/G23, RL78/G22, RL78/L23, RL78/G14 LoRa®-based Wireless Software Package Rev.4.90
[Software:RL78 Smart Configurator|V1.15.0] ,[Toolchains=CC-RL|V1.15.01]
ZIP
28.87 MB
Application:
Appliances, Building Automation, Communications Infrastructure, Connected Home & Entertainment, Industrial, Industrial Automation, Security
Compiler:
CC-RL
Function:
Software Package
IDE:
CS+ for CC, e2 studio
This LoRa-based wireles softwar package includes the sample software and evaluation tools to develop the LoRa and LoRaWAN based applications.This document describes the information on the contents of this package and how to setup the hardware and software.
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| Sample Code | FPB-RL78L23 Quick Start Example Project
[Toolchains=CC-RL|V1.50.01;IAR Embedded Workbench for RL78|V5.20.1]
ZIP
23.48 MB
Compiler:
CC-RL, ICCRL78
Function:
Other peripherals
IDE:
CS+ for CC, e2 studio, IAR EWRL78
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| Sample Code | RL78/L23 LCD display (Clock demo) Rev.1.10
[Toolchains=CC-RL|V1.50.01;IAR Embedded Workbench for RL78|V5.20.1]
ZIP
23.48 MB
日本語
Compiler:
CC-RL, ICCRL78
Function:
Other peripherals
IDE:
CS+ for CC, e2 studio, IAR EWRL78
This sample program uses the LCD controller/driver and capacitive sensor unit built into RL78/L23 to display a clock on RL78/L23 Fast Prototyping Board (FPB-RL78/L23).The user sets the time using touch buttons.
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| Sample Code | RL78/L23 3ch IH Control Using Timer KB Rev.1.00
A reference program for operating IH control using the 16-bit timers KB40, KB41, and KB42 on the RL78/L23 microcontroller. The 16-bit timers KB40, KB41, and KB42 are capable of generating PWM output suitable for IH control. Each timer includes a timer restart function, which allows the output to automatically restart in synchronization with external signals, and an IH control PWM output function, which disables restarts during a predefined active period to ensure a stable output pulse width.
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8 items
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Product Options
| Part Number | Status | Stock | Budgetary Price (USD) | Sampleable |
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| RTK7RLL230S00001BJ | Active | In Stock | 1u | $21.86 | Available |
Videos & Training
This video guides you through the development process using the FPB for RL78, covering three key steps: installing the IDE, generating a project with sample code, and verifying its operation. The video uses the FPB-RL78L23 as an example, but the process applies to FPBs for all RL78 products.
Related Resources
Additional Videos
News & Blog Posts
Support
Support Communities
- The RL78-FPB-RL78L23 board is facing an issue in reading the input status.
Hi community, I’m facing an issue while reading input on my RL78L23 development board. Below, I’ve included my full code—please guide me. #include "iodefine.h" #include
Mar 24, 2026void Clock_Init(void) { /* 1. Enable HOCO */ CSC &= ~0x01U; // HIOSTOP = 0 → HOCO ... - FPB-RL78L23: LED on P6.2 (pin 8) not blinking after flashing code
Hello, I have an FPB-RL78L23 Renesas development kit. I connected an external LED to the board: one leg of the LED goes to GND and the other leg is connected to pin 8. My goal is simply to make the LED blink. I wrote the following code and attempted ...
Nov 18, 2025 - FPB-RL78L23: LED on P6.2 (pin 8) not blinking after flashing code
Hello, I have an FPB-RL78L23 Renesas development kit. I connected an external LED to the board: one leg of the LED goes to GND and the other leg is connected to pin 8. My goal is simply to make the LED blink. I wrote the following code and attempted ...
Nov 18, 2025
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