SPRUI30H November 2015 – May 2024 DRA745 , DRA746 , DRA750 , DRA756
Depending on targeted application the SPI interface can be configured to use 3 or 4 pins through the MCSPI_MODULCTRL[1] PIN34 bit. If this bit is set to 0, McSPI is in 4-pin mode using the SPICLK, SPIDAT[0], SPIDAT[1] and SPIEN[x] signals. If PIN34 is set to 1 the controller is in 3-pin mode and SPIEN[x] is not used. In this mode all options related to chip select management are useless (EPOL, FORCE and TCS0 bits of MCSPI_CHxCONF). 3-pin and 4-pin operation applies to both master and slave modes.