SLAU893B October 2023 – July 2024 MSPM0C1103 , MSPM0C1103-Q1 , MSPM0C1104 , MSPM0C1104-Q1
The SPI module can be placed into an internal loopback mode for diagnostic or debug work by setting the LBM bit in the CTL1 register. In loopback mode, the data from the TX FIFO can serially transmitted into the RX FIFO. The data from the RX FIFO can be read to check whether correct transmission has occurred or not. The external toggling of the IOs has no effect when the module is set in the internal loopback mode.