WM8722

Advanced Information

WOLFSON MICROELECTRONICS LTD

AI Rev 1.5 May 2000

16

REGISTER

NAME

REG

ADDRESS

BIT NAME

DESCRIPTION

DEFAULT VALUE

TFREQ

1

F[14:0]

Tone frequency value

000 0000 0000 0000

Register 0

000 0000

DAL[7:0]

LDL

DAC attenuation data for left channel

Attenuation data load control for left channel

111 1111 (0dB)

0

Register 1

000 0001

DAR[7:0]

LDR

DAC attenuation data for right channel

Attenuation data load control for right

channel

111 1111 (0dB)

0

Register 2

000 0010

MU

DE

PWD

IW[1:0]

PL[3:0]

Left and right DACs soft mute control

De-emphasis control

Power off control

Input audio data bit length select

Output mode select

0 (not muted)

0 (de-emph off)

0 (power on)

00 (16 bit)

1001 (normal stereo)

Register 3

000 0011

I2S

LRP

ATC

Audio data format select

Polarity of LRCIN (pin 7) select

Attenuator control

0 ( NORMAL format)

0

0

Register 4

000 0100

MTRIML[4:0]

MUTE

Left mixer 1 attenuation data

Left mixer mute

10111 (0dB)

0 (not mute)

Register 5

000 0101

MTRIMR[4:0]

MUTE

Right mixer 1 attenuation data

Right mixer mute

10111 (0dB)

0 (not mute)

Register 6

000 0110

LVOL[6:0]

ZCEN

BOTH

Left volume 2 attenuation data

1111 001 (0dB)

Register 7

000 0111

RVOL[6:0]

ZCEN

BOTH

Right volume 2 attenuation data

1111 001 (0dB)

Register 8

000 1000

LMXSEL

M6DB0

BOTH

Left mixer output mux control

M6DB for left mix output

11100 (normal stereo)

0 (0dB)

Register 9

000 1001

RMXSEL

M6DB1

BOTH

Right mixer output mux control

M6DB for right mix output

11100 (normal stereo)

0 (0dB)

Register 10

000 1010

LVMXSEL

M6DB2

BOTH

Left variable output mux control

M6DB for left variable output

11100 (normal stereo)

0 (0dB)

Register 11

000 1011

RVMXSEL

M6DB3

BOTH

Right variable output mux control

M6DB for right variable output

11100 (normal stereo)

0 (0dB)

Register 12

000 1100

TTIM[7:0]

Tone duration

000 0000 (no tone)

Register 13

000 1101

TVOL[4:0]

MUTE

TFIN

SQR

F2F

Tone amplitude

Tone mute

Tone burst finish on zero cross

Tone sine or square wave

Tone one cycle at F, two cycle at 2xF

11111 (max output)

0 (not muted)

0 (finish on full cycle)

0 (sine wave)

0 (normal F)

Table 6. Internal Register Mapping

REGISTER TFREQ

TONE FREQUENCY

This is the special register of 15 bit length with a single bit address, to allow values for the selected

tone frequency from 1Hz to 32767Hz to be written in one word. Writing 0 turns off the tone.

6