51.6.3 Host, Controller, and Client Modes

In Host and Controller modes, the I²S provides the Serial Clock, a Word Select/Frame Sync signal and optionally a Host Clock.

In Controller mode, the I²S Serializers are disabled. Only the clocks are enabled and output for external receivers and/or transmitters.

In Client mode, the I²S receives the Serial Clock and the Word Select/Frame Sync Signal from an external host. SCKn and FSn pins are inputs.