44.6.1 Initialization

The I2SC 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 I2SC, the selected configuration must be written to the I2SC Mode Register (I2SC_MR) and to the I2S Clock Source Selection register (SFR_I2SCLKSEL) described in the section “Special Function Registers (SFR)”.

If the I2SC_MR.IMCKMODE bit is set, the I2SC_MR.IMCKFS field must be configured as described in section Serial Clock and Word Select Generation.

Once the I2SC_MR has been written, the I2SC clock generator, receiver, and transmitter can be enabled by writing a ’1’ to the CKEN, RXEN, and TXEN bits in the Control Register (I2SC_CR). The clock generator can be enabled alone in Controller mode to output clocks to the I2SC_MCK, I2SC_CK, and I2SC_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 I2SC_CR.CXDIS, I2SC_CR.RXDIS and/or I2SC_CR.TXDIS, respectively. Once requested to stop, they stop only when the transmission of the pending frame transmission is completed.