Production Data

WM8736

WOLFSON MICROELECTRONICS LTD

PD Rev 2.1 January 2001

11

RSTB RESET AND POWER DOWN CONTROL

In both hardware and software modes, this pin resets the entire device when taken low. The device

remains powered down while RSTB is held low.

RSTB

0

Device powered down and reset

RSTB

1

Device powered up and active

Table 6 Reset and Power Down Control

SOFTWARE CONTROL INTERFACE

The WM8736 can be controlled using a 3-wire serial interface. MD/DM (pin 6) is used for the program

data, MC/IWL (pin 5) is used to clock in the program data and ML/I2S (pin 4) is use to latch in the

program data. The 3-wire interface protocol is shown in Figure 7.

ML/I2S

MC/IWL

MD/DM

D6

D7

D8

A0

A1

A2

A3

B0

D1

D2

D3

D4

D5

D0

B2

B1

Figure 7 3-Wire Serial Interface

REGISTER MAP

WM8736 controls the special functions using 9 program registers, which are 16-bits long. These

registers are all loaded through input pin MD/DM. After the 16 data bits are clocked in, ML/I2S is

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

9 registers.

B2

B1

B0

A3

A2

A1

A0

D8

D7

D6

D5

D4

D3

D2

D1

D0

NOT USED

ADDRESS

DATA

M0

-

-

-

0

0

0

0

LDL

AL7

AL6

AL5

AL4

AL3

AL2

AL1

AL0

M1

-

-

-

0

0

0

1

LDR

AR7

AR6

AR5

AR4

AR3

AR2

AR1

AR0

M2

-

-

-

0

0

1

0

PL3

PL2

PL1

PL0

IW1

IW0

OPE

DE

MU

M3

--

-

0

0

1

1

IZD

---

--

ATC

LRP

I

M4

-

-

-

0

1

0

0

LDL

AL7

AL6

AL5

AL4

AL3

AL2

AL1

AL0

M5

-

-

-

0

1

0

1

LDR

AR7

AR6

AR5

AR4

AR3

AR2

AR1

AR0

M6

-

-

-

0

1

1

0

LDL

AL7

AL6

AL5

AL4

AL3

AL2

AL1

AL0

M7

-

-

-

0

1

1

1

LDR

AR7

AR6

AR5

AR4

AR3

AR2

AR1

AR0

M8

-

-

-

1

0

0

0

LDM

AM7

AM6

AM5

AM4

AM3

AM2

AM1

AM0

Table 7 Mapping of Program Registers