WM8777
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DAC CONTROL REGISTERS
DAC INPUT CONTROL
The primary audio interface has a separate input pin for each stereo DAC. Any input pin can be
routed to any DAC using the DACxSEL register bits.
REGISTER ADDRESS
BIT
LABEL
DAC1SEL
[1:0]
DEFAULT
DESCRIPTION
(38h)
1:0
00
DAC digital input select.
DAC Digital Input
Selector
00 = DAC takes data from
PDATAIP1
3:2
5:4
7:6
DAC2SEL
[1:0]
01
10
11
01 = DAC takes data from
PDATAIP2
DAC3SEL
[1:0]
10 = DAC takes data from
PDATAIP3
DAC4SEL
[1:0]
11 = DAC takes data from
PDATAIP4
Table 49 DAC Input Select Register
MUTE MODES
The WM8777 has individual mutes for each of the four DAC channels. Setting MUTE for a channel
will apply a ‘soft’ mute to the input of the digital filters of the channel muted. DMUTE[0] mutes DAC
channel 1, DMUTE[1] mutes DAC channel 2, DMUTE[2] mutes DAC channel 3 and DMUTE[3] mutes
DAC channel 4. Setting the MUTEALL register bit will apply a 'soft' mute to the input of all the DAC
digital filters
REGISTER ADDRESS
(16h)
BIT
LABEL
DEFAULT
DESCRIPTION
3:0
DMUTE[3:0]
0000
DAC channel soft mute
enables:
Mute Control
DMUTE[0] = 1, enable
softmute on DAC1.
DMUTE[1] = 1, enable
softmute on DAC2.
DMUTE[2] = 1, enable
softmute on DAC3.
DMUTE[3] = 1, enable
softmute on DAC4.
DAC channel master soft mute.
Mutes all DAC channels:
0 = disable softmute on all
DACs.
4
MUTEALL
0
1 = enable softmute on all
DACs.
Table 50 Mute Registers
PP Rev 1.94 November 2004
56
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WOLFSON [ WOLFSON MICROELECTRONICS PLC ]
