Atmel AT83SND2C MP3 - Manual (Page 49)

Protocol Frame Description
AT83SND2CMP3 User Guide 5-45
7525A–MP3–07/05
5.5 Custom Command
AUDIO_SET_GAIN Set Audio Gain:
„ Line out (default value: 02h, -3 dB).
„ Power Amplifier (default value: 07h, +2 dB).
„ Line in (default value: 08h, -9 dB).
„ Auxiliary in (default value: 07h, -6 dB).
„ Dac Master Gain (default value: 0Ch, -6 dB).
Refer to AT83SND2CMP3 datasheet (chapter DAC and PA Interface) for audio gain
description and register value.
Table 5-52 . AUDIO_SET_GAIN command
Frame Start Channel
Protocol
Command Data Length Data CheckSum
7Eh
If not used,
FFh
91h 02h
Byte 0: Gain Selector
Byte 1: Gain Value
Yes