Renesas Electronics Corporation
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Firmware Update module

Security / Crypto

Overview

By using the FIT module, users can easily incorporate firmware update functionality and secure boot functionality into their applications.

Product Composition

  • Firmware Update Module
  • Demonstration project (Sample applications: Bootloader, Update application)
  • Renesas Image Generator (Initial and update image generation tool)
Firmware Update module Structure
Firmware Update module Structure
  • Firmware update functionality can be easily integrated using the RX/RL78 family.
  • The product is equipped with a secure boot function to verify the legitimacy of the firmware.
  • The product offers a variety of update methods, such as Partial update method/Full update method/Dual-Bank method.
  • Demonstration projects are available for boards with compatible devices.
  • The acquisition of update data is implemented in the user application.
    Therefore, various update environments can be constructed.
  • Tools for generating initial/update images for firmware updates are provided. (Renesas Image Generator)
Target DeviceProduct NameVersion/ReleaseProviding Method
RL78/G22
RL78/G23
RL78/G24		RL78/G22,RL78/G23,RL78/G24 
Firmware Update Module		Latest Ver.: V.2.03 Release 00
Released: Apr. 18, 2025		Download: RL78/G22, RL78/G23, RL78/G24 Firmware Update Module Rev.2.03 - Sample Code (ZIP | English, 日本語)
RX FamilyRX Family 
Firmware Update Module 
Using Firmware Integration Technology		Latest Ver.: V.2.04 Release 00
Released: Oct. 15, 2024		Download: RX Family Firmware Update module Using Firmware Integration Technology Application Notes Rev.2.04 - Sample Code (ZIP)

Documentation

Type Title Date
Application Note
RL78/G23 Firmware Updating Communications Module
PDF 1019 KB 日本語
Related Files:
Application Note
RX Family Firmware Updating Communications Module Using Firmware Integration Technology
PDF 1.26 MB 日本語
Related Files:
Application Note
RL78/G22, RL78/G23, RL78/G24 Firmware Update Module Rev.2.03
PDF 3.52 MB 日本語
Related Files:
Application Note
RX Family Firmware Update module Using Firmware Integration Technology Application Notes Rev.2.04
PDF 10.34 MB 日本語
Related Files:
4 items

Design & Development

Sample Code
Type
Title
Date
Sample Code
RL78/G23 Firmware Updating Communications Module
[Toolchains=CC-RL|V1.15.00]
Log in to Download ZIP 6.52 MB 日本語
Application: Consumer Electronics, Industrial
Compiler: CC-RL Function: Application Example, Communication Interface, Driver or Library IDE: e2 studio
Related Files:
Sample Code
RX Family Firmware Updating Communications Module Using Firmware Integration Technology
Log in to Download ZIP 26.16 MB
Related Files:
Sample Code
RL78/G22, RL78/G23, RL78/G24 Firmware Update Module Rev.2.03 - Sample Code
[Toolchains=CC-RL|V1.14.00;LLVM for Renesas RL78|17.0.1.202412;IAR Compiler for RL78|v.5.10.1]
Log in to Download ZIP 15.77 MB 日本語
Application: Consumer Electronics
Compiler: CC-RL, ICCRL78, LLVM for Renesas RL78 Function: Driver or Library IDE: e2 studio, IAR EWRL78
Related Files:
Sample Code
RX Family Firmware Update module Using Firmware Integration Technology Application Notes Rev.2.04 - Sample Code
[Software=RX Driver Package|V1.45],[Toolchains=CC-RX|V3.06;GNURX|8.3.0.202405;IAR Compiler for RX|v.5.10.1]
Log in to Download ZIP 117.66 MB
Application: Consumer Electronics
Compiler: CC-RX, ICCRX IDE: e2 studio, GCC EWRX, IAR EWRX
Related Files:
4 items

Additional Details

Function

By using the FIT module, users can easily incorporate firmware update functionality and secure boot functionality into their applications. (A firmware update is a process in which a device overwrites its own firmware with a new version of the firmware. Firmware updates may be applied to fix bugs, add new functions, or improve performance.)

This module has the following functions.

  • Function for importing the update image acquired via the communication interface, etc. into the MCU.
  • Function to write the update image to the built-in flash. (self-programming function)
  • Function to activate the update image.
  • Function to verify the validity of the image and boot. (secure boot function)
  • The following update methods are provided.
    • Partial Update Method
    • Full Update Method (without buffer)
    • Full Update Method (buffer is external flash) RL78 only
    • Dual-Bank Method (Only for products with dual bank function)
  • Tools for generating initial/update images for firmware updates are provided. (Renesas Image Generator)

Update Method

  • Partial Update Method

    Partial Update Method

  • Full Update Method (without buffer)

    Full Update Method (without buffer)

  • Full Update Method (buffer is external flash) RL78 only

    Full Update Method (buffer is external flash) RL78 only

  • Dual-Bank Method (Only for products with dual bank function)

    Dual-Bank Method (Only for products with dual bank function)

Renesas Image Generator

  • Renesas Image Generator is a utility tool that generates firmware images for use with firmware update modules. The Renesas Image Generator can generate the following images used by the firmware update module.
    • Initial image:An image file containing the bootloader and application program that is programmed using Flash Writer at the time of initial system configuration (extension: mot).
    • Update image: An image file containing the firmware update (extension: rsu).

 

  • Generate initial image (Linear mode)

    Generate initial image (Linear mode)

  • Generate initial image (Dual-bank mode)

    Generate initial image (Dual-bank mode)

  • Generate update image

    Generate updated image

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