FreeRTOSTM software platform for RX MCUs: helping to reduce system development times

The RX real-time OS package combines FreeRTOSTM and Firmware Integration Technology (FIT) modules.

Release Information

RX231 Group Serial Transfer Demo using RX real-time OS Package

Released: Mar.31.2017

Details and points to note regarding revisions of various FIT modules included in the RX real-time OS Package (See Tool News)


  • You can use the open-source FreeRTOSTM real-time OS in developing multi-tasking applications.
  • Take advantage of the hardware by combining the middleware and device drivers we provide with the real-time OS.
  • This package allows you to start using the peripheral functions of RX MCUs at once, and can shorten times taken in considering prototypes.
  • Applications which utilize FIT can be used for all RX-series products, and can reduce the cost of developing software as you expand your product development.


  • FreeRTOSTM
  • FIT middleware module
  • FIT interface module
  • FIT peripheral function module
  • Board support package (BSP) module

Operating Environment

For details, refer to the application notes for this product.

FreeRTOSTM is a trademark of Amazon Web Services, Inc.

Target Devices

Family Group
RX Family

Development Tools Support

Title Description
My Renesas Create a My Renesas account to use our tool download services,
receive e-newsletter/update notifications, and take advantage of our other services.
e-learning Information for studying and learning about microcontrollers and microprocessors.
FAQ Frequently asked questions and useful hints for development.
Forum A forum and community site to share technical information,
questions and opinions with others who use Renesas MCU's.
Tool News Tool release information and other important information.
Operating Environment Information on system requirements and operating environment for the latest
version of tools.
Info on Discontinued Products A list of Renesas software and tools that have been discontinued and
are no longer being offered for new projects.
You can filter the sample codes and application notes that are displayed using the below filters.

Action Needed