44.3.1 Clocks

Audio peripherals are part of the APB Client (APS) matrix, clocked by MCK1. Their peripheral clocks and generic clocks are controlled in the PMC.

To generate audio frequencies with high accuracy, the device embeds a fractional audio PLL that can serve both the internal (GCLK generation) and external needs (MCK generation on external audio components).

The ASRC receives the frame synchronization signals from all audio peripherals so it can adapt its internal DSP filters to the (unknown) rate of the interface it is connected to, on both its input and output sides. Therefore, converting the audio sample rate from one interface to another can be done with no knowledge of these rates.