STAC9752/9753
TWO-CHANNEL, 20-BIT, AC’97 2.3 CODECS WITH HEADPHONE DRIVE, SPDIF OUTPUT MICROPHONE & JACK SENSING
IDT™
49 STAC9752/9753
REV 3.3 1206
TWO-CHANNEL, 20-BIT, AC’97 2.3 CODECS WITH HEADPHONE DRIVE, SPDIF OUTPUT MICROPHONE & JACK SENSING
8.1.3. Headphone Volume Registers (04h)
Default: 8000h
Bit(s) Reset Value Name Description
15 1 Mute
0 = No mute
1 = Mutes both left & right channels
14 0 RESERVED Bit not used, should read back 0
13 0 ML5
0 = Lineout attenuation is a function of bits12-8
1 = Forces register bits 12-8 to be 11111. Always reads back 0.
12:8 0 ML<4:0>
Left Lineout Volume Control
00000 = 0dB attenuation
00001 = 1.5dB attenuation
.....
11111 = 46.5dB attenuation
7:6 0 RESERVED Bits not used, should read back 0
5 0 MR5
0 = Lineout attenuation is a function of bits 4-0
1 = Forces register bits 4-0 to be 11111
Always reads back 0
4:0 0 MR<4:0>
Right Channel Lineout Volume Control
00000 = 0dB attenuation
00001 = 1.5dB attenuation
.....
11111 = 46.5dB attenuation
D15 D14 D13 D12 D11 D10 D9 D8
Mute RSRVD HPL5 HPL4 HPL3 HPL2 HPL1 HPL0
D7 D6 D5 D4 D3 D2 D1 D0
RESERVED HPR5 HPR4 HPR3 HPR2 HPR1 HPR0
Bit(s) Reset Value Name Description
15 1 Mute
0 = No mute
1 = Mutes both left & right channels
14 0 RESERVED Bit not used, should read back 0
13 0 ML5
0 = Headphone attenuation is a function of bits12-8
1 = Forces register bits 12-8 to be 11111. Always reads back 0
12:8 0 ML<4:0>
Left Headphone Volume Control
00000 = 0dB attenuation
00001 = 1.5dB attenuation
.....
11111 = 46.5dB attenuation
7:6 0 RESERVED Bits not used, should read back 0
5 0 MR5
0 = Headphone attenuation is a function of bits 4-0
1 = Forces register bits 4-0 to be 11111. Always reads back 0
4:0 0 MR<4:0>
Right Channel Headphone Volume Control
00000 = 0dB attenuation
00001 = 1.5dB attenuation
.....
11111 = 46.5dB attenuation
