2.12 Bypass Mode (Pin 14)
The FM1288 supports a Bypass Communication mode by asserting TEST2 pin to high.
In this Bypass Communication mode, the microphone input signal of MIC0_IN will be routed to LINE_OUT
and input signal of LINE_IN to SPK_OUT directly. It bypasses the internal ADC, DSP, and DAC. The PGA
gain setting and internal pre-amplifiers are still working with the input and output signal.
The mode can be toggled on and off during runtime by the hardware TEST2 pin.
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