AD1985 Analog Devices, AD1985 Datasheet - Page 18

• Manufacturer Part Number: AD1985
• Description: AC'97 2.3 Soundmax Codec W/jack Sensing
• Manufacturer: Analog Devices

AD1985
PC Beep Register (Index 0x0A)
Reg Name
0x0A PC Beep Volume PCBM X
This register controls the level and frequency for the digital PC beep generated by the codec.
PV3–PV0
PCBF7–PCBF0
The register default value is 0x8000, which corresponds to 0 dB
attenuation with mute on.
PCBM
0
0
1
PV3–PV0
0000
1111
xxxx
Function
0 dB Attenuation
45 dB Attenuation
∞ dB Attenuation
D15 D14 D13 D12
Controls the volume of the generated signal. Each step corresponds to approximately 3 dB of attenuation. The
MSB of the register is the mute bit. When this bit is set to 1, the level for the signal is set at –∞ dB.
These bits are writeable, and the codec-digital PCBEEP generation is supported. The beep frequency generated
is the result of dividing the 48 kHz clock by 4 times the number specified in PCBF[7:0], allowing tones from 47 Hz
to 12 kHz. A value of 0x00 in Bits PCBF[7:0] disables internal PC beep generation. The PV bits control the volume
level of the generated signal.
X
PCBF7 PCBF6 PCBF5 PCBF4 PCBF3 PCB F2 PCBF1 PCBF0 PCBV3 PCBV2 PCBV1 PCBV0 X 0x8000
D11
D10
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D9
D8
PCBF
0x00
0x01
0x0C
0xFF
D7
Frequency of PC Beep
PC Beep Disabled
12 kHz
1 kHz
47 Hz
D6
D5
D4
D3
D2
D1
D0 Default