The three-line bus has to handle only audio data generally time-multiplexed on two
channels: the right channel and the left channel. However there is only one 16-bit register
for the transmission and the reception. So, it is up to the software to write into the data
register the adequate value corresponding to the considered channel side, or to read the
data from the data register and to identify the corresponding channel by checking the
CHSIDE bit in the SPI_SR register. Channel Left is always sent first followed by the channel
right (CHSIDE has no meaning for the PCM protocol).
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