Figure 8: Timing of Primary Mode
In auxiliary mode, the data is sampled on the falling edge of the PCM_CLK and transmitted on the rising
edge; while the PCM_SYNC rising edge represents the MSB. In this mode, PCM interface operates with a
128kHz PCM_CLK and an 8kHz, 50% duty cycle PCM_SYNC only. The following figure shows the timing
relationship in auxiliary mode with 8kHz PCM_SYNC and 128kHz PCM_CLK.
Figure 9: Timing of Auxiliary Mode
Clock and mode can be configured by AT command, and the default configuration is master mode using
short sync data format with 2048kHz PCM_CLK and 8kHz PCM_SYNC.
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