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TPS92682-Q1: what message MCU & BOOST IC communication via SPI ?

Part Number: TPS92682-Q1

Hello, 

I am designing a LMMS(ADB) lamp via TI solution. 

In a typical LMMS control solution, i want know

1. what message MCU & BOOST IC communication via SPI ? (the message MCU send and get)

2. what message MCU & BUCK IC communication via SPI ? (the message MCU send and get)

3. if you have some files to detail explain about LMMS control mechanism,we will appreciate it.