AN12202: Using Synchronous Audio Interface (SAI) on ...

signals will be generated internally based on clock source reference and divider configuration fields. In S2K148, SAI can use up to four different clock sources: its module clock (Bus Clock), its external MCLK clock, frequency from System Oscillator Clock Divider 1 (SOSCDIV1) and the external MCLK clock from the opposite SAI instance.

  Clock, Divider, Clock divider