WM8768

Production Data

w

PD Rev 4.1 March 2005

26

MUTE PIN AS INPUT

The WM8768 can be muted externally by driving the MUTE pin high. When the MUTE pin is driven

low the device will never automute, although direct mutes can still be applied via the DMUTE or

MUTEALL registers.

The DZFM bits are used to decode the operation of a MUTE pin (decides which channels will be

affected by the logic level present on the MUTE pin). MPD (Mute Pin Decode) is used to enable the

DZFM operation. If MPD is set, the selection made by the DZFM bits will be ignored and all channels

will be muted when the pin is driven high.

Table 11 below describes which channels will be softmuted when the MUTE pin is driven high

depending on the MPD and DZFM bits.

MPD

{DZFM4,DZFM [1:0]}

CHANNELS MUTED WHEN

MUTE PIN HIGH

0

000

All Channels

0

001

CH1

0

010

CH2

0

011

CH3

0

100

CH4

0

101

CH1 and CH2

0

110

CH1, CH2 and CH3

0

111

CH3 and CH4

1

000

All Channels

1

001

All Channels

1

010

All Channels

1

011

All Channels

1

100

All Channels

1

101

All Channels

1

110

All Channels

1

111

All Channels

Table 11 Mute Pin Decode when Mute Pin as Input