6.3.6.1 Initialization

The I2SMCC features a receiver, a transmitter and a clock generator for Host and Controller modes. Receiver and transmitter share the same serial clock and word select.

Before enabling the I2SMCC, the selected configuration must be written to the I2SMCC Mode Register A (I2SMCC_MRA). If I2SMCC_MRA.FORMAT is configured in one of the TDM formats, then the I2SMCC_MRA.NBCHAN and I2SMCC_MRA.TDMFS fields must also be written.

Once the I2SMCC_MRA has been written, the I2SMCC clock generator, receiver, and transmitter can be enabled by writing a ‘1’ to the CKEN, RXEN, and TXEN bits in the Control Register (I2SMCC_CR). The clock generator can be enabled alone in Controller mode to output clocks to the I2SMCC_MCK, I2SMCC_CK, and I2SMCC_WS pins. The clock generator must also be enabled if the receiver or the transmitter is enabled.

The clock generator, receiver, and transmitter can be disabled independently by writing a ‘1’ to I2SMCC_CR.CXDIS, I2SMCC_CR.RXDIS and/or I2SMCC_CR.TXDIS, respectively. Once requested to stop, they stop only when the transmission of the pending frame transmission is completed.