Information

The RMR causes the received data for each selected word to be discarded and not written
to the receive FIFO.
46.4.7 Interrupts and DMA requests
The SAI transmitter and receiver generate separate interrupts and separate DMA requests,
but support the same status flags. Asynchronous versions of the transmitter and receiver
interrupts are generated to wake up the CPU from stop mode.
46.4.7.1 FIFO data ready flag
The FIFO data ready flag is set based on the number of entries in the FIFO and the FIFO
watermark configuration.
The transmit data ready flag is set when the number of entries in any of the enabled
transmit FIFOs is less than or equal to the transmit FIFO watermark configuration and is
cleared when the number of entries in each enabled transmit FIFO is greater than the
transmit FIFO watermark configuration.
The receive data ready flag is set when the number of entries in any of the enabled
receive FIFOs is greater than the receive FIFO watermark configuration and is cleared
when the number of entries in each enabled receive FIFO is less than or equal to the
receive FIFO watermark configuration.
The FIFO data ready flag can generate an interrupt or a DMA request.
46.4.7.2 FIFO warning flag
The FIFO warning flag is set based on the number of entries in the FIFO.
The transmit warning flag is set when the number of entries in any of the enabled
transmit FIFOs is empty and is cleared when the number of entries in each enabled
transmit FIFO is not empty.
The receive warning flag is set when the number of entries in any of the enabled receive
FIFOs is full and is cleared when the number of entries in each enabled receive FIFO is
not full.
The FIFO warning flag can generate an Interrupt or a DMA request.
Chapter 46 Synchronous Audio Interface (SAI)
K20 Sub-Family Reference Manual, Rev. 2, Feb 2012
Freescale Semiconductor, Inc. 1175