WM8746
Production Data
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
Software Control Mode
Hardware Control Mode
0
1
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
A6
A5
A4
A3
A2
A1
A0
D8
D7
D6
D5
D4
D3
D2
D1
D0
MD/DM
Figure 13 3-wire Serial Interface
Notes:
1. A[6:0] are Control Address Bits
2. D[8:0] are Control Data Bits
March 2006, PD Rev 4.0
22
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WOLFSON [ WOLFSON MICROELECTRONICS PLC ]
