WM8706

Production Data

w

PD Rev 4.1 July 2005

16

3-WIRE (SPI COMPATIBLE) SERIAL CONTROL MODE

The WM8706 can be controlled using a 3-wire serial interface. MDDM0 is used for the program

data, MCDM1 is used to clock in the program data and MLIIS is used to latch in the program

data. The 3-wire interface protocol is shown in Figure 11.

MLIIS

MCDM1

MDDM0

B15

B6

B7

B8

B9

B10

B11

B12

B13

B14

B1

B2

B3

B4

B5

B0

Figure 11 3-Wire Serial Interface

Notes:

1.

B[15:9] are Control Address Bits

2.

B[8:0] are Control Data Bits

REGISTER MAP

WM8706 uses a total of 4 programme registers, which are 16-bits long. These registers are all

loaded through input pin MDDM0. After the 16 data bits are clocked in, MLIIS is used to latch in

the data to the appropriate register. Table 7 shows the complete mapping of the

4 registers.

B15

B14

B13

B12

B11

B10

B9

B8

B7

B6

B5

B4

B3

B2

B1

B0

M0

0

0

0

0

0

0

0

UPDATEL

LAT7

LAT6

LAT5

LAT4

LAT3

LAT2

LAT1

LAT0

M1

0

0

0

0

0

0

1

UPDATER

RAT7

RAT6

RAT5

RAT4

RAT3

RAT2

RAT1

RAT0

M2

0

0

0

0

0

1

0

0

0

0

IW2

IW1

IW0

PWRDN DEEMPH

MUT

M3

0

0

0

0

0

1

1

IZD

SF1

SF0

BCP

REV

0

ATC

LRP

I

ADDRESS

DATA

Table 7 Mapping of Program Registers