wm8775 Wolfson Microelectronics plc, wm8775 Datasheet - Page 20

• Manufacturer Part Number: wm8775
• Description: 24-bit, 96khz Adc With 4 Channel I/p Multiplexer
• Manufacturer: Wolfson Microelectronics plc

WM8775
CONTROL INTERFACE OPERATION
w
Figure 19 DSP/PCM Mode Audio Interface (mode B, LRP=0, Slave)
The WM8775 is controlled using a 3-wire serial interface in a SPI compatible configuration or
a 2-wire serial interface mode. The interface type is selected by the MODE pin as shown in
Table 9.
Table 9 Control Interface Selection via MODE pin
3-WIRE (SPI COMPATIBLE) SERIAL CONTROL MODE
DI is used for the program data, CL is used to clock in the program data and CE is used to latch the
program data. DI is sampled on the rising edge of CL. The 3-wire interface protocol is shown in
Figure 20.
Figure 20 3-Wire SPI Compatible Interface
1.
2.
3.
CE
CL
DI
MODE
B[15:9] are Control Address Bits
B[8:0] are Control Data Bits
CE is edge sensitive – the data is latched on the rising edge of CE.
0
1
B15
B14
2 wire interface
3 wire interface
Control Mode
B13
B12
B11
B10
B9
B8
B7
B6
B5
B4
B3
PD, Rev 4.4, October 2008
B2
B1
Production Data
B0
20