alc250-lf Realtek Semiconductor Corporation, alc250-lf Datasheet - Page 12

• Manufacturer Part Number: alc250-lf
• Description: Two-channel Ac?97 2.3 Audio Codec With Equalizer
• Manufacturer: Realtek Semiconductor Corporation

6.1.1 MX00 Reset
Default: 0190h
Writing any value to this register will start a register reset, and cause all registers to revert to their default values. The written data
is ignored. Reading this register returns the ID code of the specific part.
6.1.2 MX02 Master Volume
Default: 8000h
These registers control the overall volume level of the output functions. Each step on the left and right channels correspond to
1.5dB in increase/decrease in volume.
6.1.3 MX04 Headphone
Default: 8000h
Register 04h controls the headphone (ALC250) output volume. Each step in bits 5:0 and 13:8 correspond to 1.5dB in
increase/decrease in volume, allowing 63 levels of volume, from 000000 to 111111.
Two-Channel AC’97 2.3 Audio Codec
14:10
13:8
13:8
Bit
7:6
5:0
Bit
7:6
5:0
Bit
15
14
15
14
15
9
8
7
6
5
4
3
2
1
0
For MRV/MLV: 00h
For HPR/HPL: 00h
Type
Type
Type
R/W
R/W
R/W
R/W
R/W
R/W
R
R
R
R
R
R
R
R
R
R
R
Reserved
Return 00000b
Read as 0 (No support for 20-bit ADC)
Read as 1 (Support for 18-bit ADC)
Read as 1 (Support for 20-bit DAC)
Read as 0 (No support for 18-bit DAC)
Read as 0 (No support for Loudness)
Read as 1 (Headphone output support)
Read as 0 (No simulated stereo; for analog 3D block use)
Read as 0 (No Bass & Treble Control)
Reserved, Read as 0
Read as 0 (No dedicated MIC PCM input)
Mute Control 0: Normal
Reserved
Master Left Volume (MLV[5:0]) in 1.5 dB steps
Reserved
Master Right Volume (MRV[5:0]) in 1.5 dB steps
Mute Control 0: Normal
Reserved
Headphone/True Line Output Left Volume (HPL[5:0]) in 1.5 dB steps
Reserved
Headphone/True Line Output Right Volume (HPR[5:0]) in 1.5 dB steps
3Fh
3Fh
0 dB attenuation
94.5 dB attenuation
0 dB attenuation
94.5 dB attenuation
1: Mute (-∞ dB)
1: Mute (-∞ dB)
7
Function
Function
Function
ALC250 DataSheet
Rev1.3