Advanced Information

WM8722

WOLFSON MICROELECTRONICS LTD

AI Rev 1.5 May 2000

15

REGISTER MAP

The WM8722 controls the device functions using 15 program registers, each of which is 16-bits long.

These registers are all loaded via the serial control interface in either 2 or 3-wire mode.

There are two type of control word; either TFRQ, the tone frequency word, which is a single address

bit followed by 15 data bits, or other types, which have 6 address bits, and 10 bits of data. Other

types have the lead address bit inverted compared to TFREQ words, allowing use of a single write to

load the required frequency.

REG

B15

B14

B13

B12

B11

B10

B9

B8

B7

B6

B5

B4

B3

B2

B1

B0

TFREQ

1

F[14:0]

R0

0

0

0

0

0

LDL

DAL [7:0]

R1

0

0

0

0

1

LDR

DAR[7:0]

R2

0

0

0

1

0

PL[3:0]

IW1

IW0

PWD

DE

MU

R3

0

0

0

1

1

res

res

res

res

res

res

ATC

LRP

I2S

R4

0

0

1

0

0

BOTH

res

res

MUTE

MTRIML[4:0]

R5

0

0

1

0

1

BOTH

res

res

MUTE

MTRIMR[4:0]

R6

0

0

1

1

0

BOTH

ZCEN

LVOL[6:0]

R7

0

0

1

1

1

BOTH

ZCEN

RVOL[6:0]

R8

0

1

0

0

0

BOTH

res

res

M6DB0

LMXSEL(4-0)

R9

0

1

0

0

1

BOTH

res

res

M6DB1

RMXSEL(4-0)

R10

0

1

0

1

0

BOTH

res

res

M6DB2

LVMXSEL(4-0)

R11

0

1

0

1

1

BOTH

res

res

M6DB3

RVMXSEL(4-0)

R12

0

1

1

0

0

res

TTIM[7:0]

R13

0

1

1

0

1

F2F

SQR

TFIN

MUTE

TVOL[4:0]

Table 5. Mapping of Program Registers