160 MHz RXv3 core with on-chip memory for control firmware
The R5F566TAAGFP#30: That EEPROM block holds calibration coefficients or configuration parameters without wearing the flash — useful for field-updated setpoints in a motor drive or sensor head. The wide supply tolerance also means it survives a 5 V logic bus without level translation on the I/O side.
Industrial temperature grade and peripheral set
The MMC/SD peripheral lets the MCU log data directly to an SD card without an external controller.
Package rework and board-fit considerations
Housed in a 100-LQFP (also supplied as 100-LFQFP, 14x14 mm), the gull-wing leads are visible for inspection and hand-solderable with a fine-tip iron. The 0.5 mm pitch demands a steady hand and a good stencil for paste, but it is far more forgiving than a QFN or BGA under hot air — the leads wick solder and self-align on reflow. Pin 1 is marked by a chamfered corner and a dot on the package body.