54.6.1.1 Description

The PDM clock (PDMIC_CLK) is used to sample the PDM bitstream.

The PDMIC_CLK frequency range is between peripheral clock/2 and peripheral clock/256 or between GCLK clock/2 and GCLK clock/256, depending on the selected clock source.

The GCLK clock frequency must always be at least three times lower than the peripheral clock frequency.

The field PRESCAL in the Mode Register (PDMIC_MR) must be programmed in order to provide a PDMIC_CLK frequency compliant with the microphone parameters.