Firmware Update module

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)

• Partial Update Method

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• Full Update Method (without buffer)

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

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

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• 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)

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• Generate initial image (Dual-bank mode)

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• Generate update image

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The firmware updating communications module is middleware which controls communications between MCUs in which the secondary MCU receives firmware for use in updating from the primary MCU and applies the firmware to updating in a system of the kind shown below, consisting of the primary MCU and the secondary MCU.

Users can easily update the firmware of the secondary MCU by embedding this module into the primary and secondary MCUs.

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Software configuration of primary MCU-secondary MCU system (RX MCU) using this module

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