SLAU723A October 2017 – October 2018 MSP432E401Y , MSP432E411Y
The Freescale SPI interface is a four-wire interface where the SSInFss signal behaves as a slave select. If operating in legacy mode and using the Freescale SPI frame format, the inactive state and phase of the SSInClk signal are programmable through the SPO and SPH bits in the SSICR0 control register. If operating in advanced-, bi-, or quad-SSI mode, the SP0 and SPH bits must be programmed to 0.