CS4291 查看數據表（PDF） - Cirrus Logic

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CS4291

Audio Codec ’97 with Headphone Amplifier

Cirrus Logic 

CS4202

4.10 General Purpose Register (Index 20h)

D15 D14 D13 D12 D11 D10 D9 D8 D7 D6 D5 D4 D3 D2 D1 D0

0

0

0

0

0

0 MIX MS LPBK 0

0

0

0

0

0

0

MIX

MS

LPBK

Default

Mono Output Path. This bit controls the source of the mono output driver. When ‘clear’, the

output of the stereo-to-mono mixer is sent to the mono output. When ‘set’, the output of the

microphone boost stage is sent to the mono output. The source of the stereo-to-mono mixer

is controlled by the TMM bit in the AC Mode Control Register (Index 5Eh). The source of the

microphone boost stage is controlled by the MS bit in the General Purpose Register

(Index 20h).

Microphone Select. The MS bit determines which of the two Mic inputs are passed to the mix-

er. When ‘set’, the MIC2 input is selected. When ‘clear’, the MIC1 input is selected.

Loopback Enable. When ‘set’, the LPBK bit enables the ADC/DAC Loopback Mode. This bit

routes the output of the ADCs to the input of the DACs without involving the AC-link.

0000h

28

DS549PP2

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