The OP8666 provides a micro SD card slot (on the ControlCARD), which enables communication between the microcontroller and the micro SD card via Serial Peripheral Interface (SPI) interface.
The MicroSD card slot is located on the F28379D controlCARD, which is accessible when the top acrylic cover is removed. Removing the acrylic cover won't void your warranty.
Connections with microcontroller
Signal | Controller Pin Name | Controller Pin |
GPIO125 | T9 | |
DI | GPIO122 | T8 |
CLK | GPIO124 | V8 |
DO | GPIO123 | U8 |