WM8746

Advance Information

PP Rev 1.4 November 2001

13

MODES OF OPERATION

Control of the various modes of operation for the WM8746 is either by software control over the serial

interface ,or by hard-wired pin control. Selection of software or hardware mode is via the MODE pin.

The following functions may be controlled either via the serial control interface or by hard wiring of

the appropriate pins.

FUNCTION

OPTIONS

SOFTWARE CONTROL

DEFAULT VALUE

PIN 8: MODE = 0

HARDWARE CONTROL

BEHAVIOUR

PIN 8: MODE = 1

Input audio data format

Right justified

Left justified

I

DSP formats

FMT = 00 (default)

FMT = 01

FMT = 10

FMT = 11

Pin 12, 13: ML/I2S, MC/IWL = 00, 01 or 10

Not available in hardware mode

Pin 12, 13: ML/I2S, MC/IWL = 11

Not available in hardware mode

Input word length

16

20

24

32

IWL[1:0] = 00

IWL[1:0] = 01

IWL[1:0] = 10 (default)

IWL[1:0] = 11

Pin 12, 13: ML/I2S, MC/IWL = 00 (RJ)

Pin 12, 13: ML/I2S, MC/IWL = 01 (RJ)

Pin 12, 13: ML/I2S, MC/IWL = 10 (RJ)

Pin 12, 13: ML/I2S, MC/IWL = 11 (I

De-emphasis selection

On

Off

DEEMPH = 1

DEEMPH = 0 (Default)

Pin 14: MD/DM = 1

Pin 14: MD/DM = 0

Mute

On

Off

MUTE = 1

MUTE = 0 (default)

Pin 9: MUTE = 1

Pin 9: MUTE = 0

Input LRCIN polarity

Normal

Inverted

LRP = 0 (default)

LRP = 1

Not available in hardware mode,

default value set

Volume control

Lch, Rch

individually

Lch, Rch

common

ATC = 0; 0dB (default)

ATC = 1

Not available in hardware mode,

gain defaults to 0dB

Infinite zero detect

On

Off

IZD = 1

IZD = 0 (default)

Automute function controlled from MUTE pin

low = never mute

floating = automute enable

high = mute

Power down

Chip on

Chip off

PWDN = 0 (default)

PWDN = 1

Run SCKI

Stop SCKI

DAC output control

See Table 6

for all options

Default is PL[3:0] = 1001, stereo mode

Not available in hardware mode

Table 5 Control Function Summary