SPRUJ79 November 2024 F29H850TU , F29H859TU-Q1
In 3-wire peripheral mode, SPICLKx, SPISTEx, and SPIPOCIx pins must be configured as SPI pins (SPIPICOx pin can be configured as non-SPI pin). Like in controller mode, when transmitting, the peripheral receives the data transmitted and must clear this junk data from the receive buffer.