The SPIS peripheral shares registers and other resources with peripherals that have the same ID as SPIS. Before SPIS can be configured and used, all peripherals that have the same ID as SPIS must be disabled.
Disabling a peripheral with the same ID as SPIS will not reset any shared SPIS registers. Configure all SPIS registers to ensure they operate correctly.
See the Instantiation table in Instantiation for details on peripherals and their IDs.