"This application note describes RX Family SD Slave Interface (SDSI) control module and explains its use. The module is a SD slave control module using Firmware Integration Technology (FIT)."

This document covers the RSPIA Module Using Firmware Integration Technology (FIT) for the supported RX family MCUs. Details are provided that describe the RSPIA driver’s architecture, integration of the FIT module into a user's application, and how to use the API. The RX family MCUs supported by this module have a built-in Enhanced Serial Peripheral Interface (RSPIA) for only one channel. The RSPIA performs synchronous serial communication with full duplex or simplex (transmit-only or receive-only). It has a function that performs serial communication with multiple processors and peripheral.