2.3.1 SPI SS Pin is Connected to Pin Even if SPI is Configured to Have No Port Connection
The SPIn SS pin is connected even if NONE is selected in the SPIn field in PORTMUX.TWISPIROUTE. If SPIn is operating in Host mode and the SS pin goes low, or input is disabled, the SPIn will exit Host mode.
Work around
Write the SSD bit in SPIn.CTRLB to ‘1’ to ignore the SS
signal.Affected Silicon Revisions
| Rev. A |
| X |