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The clock signal that goes to the PDM mic is generated by the PSoC. The PDM/PCM block itself does not know if the microphone is powered or not. As long the block is enable, it generates the PDM clock and expect to read back some data from the PDM Data line.
If you want to stop sampling the PDM mic when it is OFF, perhaps you can connect the PDM mic VDD as an input to the PSoC. If the input is HIGH, you know the mic is ON. If it is low, it it is OFF, so simply disable the PDM/PCM block.