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VS1003

MP3/WMA AUDIO CODEC

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8.6.1 SCI_MODE (RW)

VS1003

8 FUNCTIONAL DESCRIPTION

SCI_MODE is used to control the operation of VS1003 and defaults to 0x0800 (SM_SDINEW

set).

Bit Name

Function

Value Description

0 SM_DIFF

Differential

0 normal in-phase audio

1 left channel inverted

1 SM_SETTOZERO Set to zero

0 right

1 wrong

2 SM_RESET

Soft reset

0 no reset

1 reset

3 SM_OUTOFWAV Jump out of WAV decoding

0 no

1 yes

4 SM_PDOWN

Powerdown

0 power on

1 powerdown

5 SM_TESTS

Allow SDI tests

0 not allowed

1 allowed

6 SM_STREAM

Stream mode

0 no

1 yes

7 SM_SETTOZERO2 Set to zero

0 right

1 wrong

8 SM_DACT

DCLK active edge

0 rising

1 falling

9 SM_SDIORD

SDI bit order

0 MSb first

1 MSb last

10 SM_SDISHARE

Share SPI chip select

0 no

1 yes

11 SM_SDINEW

VS10xx native SPI modes

0 no

1 yes

12 SM_ADPCM

ADPCM recording active

0 no

1 yes

13 SM_ADPCM_HP ADPCM high-pass filter active 0 no

1 yes

14 SM_LINE_IN

ADPCM recording selector

0 microphone

1 line in

When SM_DIFF is set, the player inverts the left channel output. For a stereo input this creates

virtual surround, and for a mono input this creates a differential left/right signal.

Software reset is initiated by setting SM_RESET to 1. This bit is cleared automatically.

If you want to stop decoding a WAV, WMA, or MIDI file in the middle, set SM_OUTOFWAV, and

send data honouring DREQ until SM_OUTOFWAV is cleared. SCI_HDAT1 will also be cleared.

For WMA and MIDI it is safest to continue sending the stream, send zeroes for WAV.

Bit SM_PDOWN sets VS1003 into software powerdown mode. Note that software powerdown

is not nearly as power efficient as hardware powerdown activated with the XRESET pin.

If SM_TESTS is set, SDI tests are allowed. For more details on SDI tests, look at Chapter 9.8.

Version: 1.09, 2018-03-16

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