WM8746

Advance Information

PP Rev 1.4 November 2001

21

SOFTWARE CONTROL INTERFACE

The software control interface uses a 3-wire serial control interface. Selection of interface format is

achieved by setting the state of the MODE pin.

MODE

INTERFACE FORMAT

0

Software Control Mode

1

Hardware Control Mode

Table 11 Control Interface Mode Selection

3-WIRE (SPI COMPATIBLE) SERIAL CONTROL MODE

The WM8746 can be controlled using a 3-wire serial interface. MD/DM is used for the program data,

MC/IWL is used to clock in the program data and ML/I2S is use to latch in the program data. The 3-

wire interface protocol is shown in Figure 13.

ML/I2S

MC/IWL

MD/DM

D6

D7

D8

A0

A1

A2

A3

A4

D1

D2

D3

D4

D5

D0

A5

A6

Figure 13 3-wire Serial Interface

Notes:

1.

A[6:0] are Control Address Bits

2.

D[8:0] are Control Data Bits