SPRUIZ1B July 2023 – August 2024 TMS320F28P650DH , TMS320F28P650DK , TMS320F28P650SH , TMS320F28P650SK , TMS320F28P659DH-Q1 , TMS320F28P659DK-Q1 , TMS320F28P659SH-Q1
To receive data in 3-wire controller mode, the controller must clear the TALK (SPICTL.1) bit to 0 to close the transmit path and then transmit dummy data to initiate the transfer from the peripheral. Because the TALK bit is 0, unlike in transmit mode, the controller dummy data does not appear on the SPIPICOx pin, and the controller does not receive the dummy data. Instead, the data from the peripheral is received by the controller.