MultiMediaCard / eMMC Driver for RX Family

This device driver controls MultiMediaCards (MMCs) and Embedded MultiMediaCards (eMMCs) by using the dedicated interfaces which are embedded in various MCUs.

This driver allows the updating and reading of data by calling user API functions. It is also an FIT module which supports our Firmware Integration Technology (FIT), so sample code for it is easy to integrate with user applications in combination with other FIT modules. Also, operation with DMAC or DTC transfer can be implemented by combining the driver with the DMAC FIT module or DTC FIT module. The driver is robust against mechanical vibration, so is suitable for industrial use.

About FIT

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The MultiMediaCard / eMMC Driver for RX Family for RX Family V.1.04 has been released. It is now downloadable from our web site.

Release Information

Latest Ver.: V1.04

Released: Feb. 1, 2019


Item Function
Conforming standard JEDEC Standard JESD84-A441
JEDEC Standard JESD84-B50
Bus interface MMC mode (1-bit/4-bit/8-bit) is supported
Number of MMC devices controlled One device/channel
Speed mode The Backward-compatible and High-speed mode are supported.
Microcontroller internal data transfer method Either software, DMAC, or DTC transfer can be selected
MCU-dependent portion Separate interface functions are provided for different target MCUs.
Memory capacity Media up to 2 GB is supported with byte access mode, and media over 2 GB is supported with sector access mode.
Memory control objects Only a user area is supported
Boot area control is not supported

MultiMediaCard is a trademark of MultiMediaCard Association (MMCA)

Application Configuration

Application Configuration

Target Device & Product Lineup

Product Name MultiMediaCard / eMMC Driver for RX Family
Target Devices MultiMediaCard, eMMC
Target MCUs RX64M, RX65N, RX651, RX71M
Evaluation Board SD card slot or HMI Expansion Board 1 is required. You can evaluate the driver on any of the following kits.

1. Please purchase HMI Expansion Board.

The FAT32 formatter is capable of formatting eMMC devices with capacities up to 128 GB to have FAT32 file systems.

Obtaining the Product


Related Software

Please contact a Renesas sales representative or agent if using in combination with FAT file system.

M3S-TFAT-Tiny for the RX Family Support is only for FAT12, FAT16, and FAT32.

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