WM8776SEFT/V Wolfson Microelectronics, WM8776SEFT/V Datasheet - Page 23

• Manufacturer Part Number: WM8776SEFT/V
• Description: Audio CODECs Stereo CODEC with 5-Ch Mux
• Manufacturer: Wolfson Microelectronics

Specifications of WM8776SEFT/V

• Maximum Operating Temperature: + 85 C
• Mounting Style: SMD/SMT
• Package / Case: TQFP-48
• Minimum Operating Temperature: - 25 C
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

Production Data
CONTROL INTERFACE OPERATION
w
Figure 19 DSP/PCM Mode Audio Interface (mode B, LRP=0, Slave)
The WM8776 is controlled by writing to registers through a serial control interface. A control word
consists of 16 bits. The first 7 bits (B15 to B9) are address bits that select which control register is
accessed. The remaining 9 bits (B8 to B0) are data bits, corresponding to the 9 bits in each control
register. The control interface can operate as either a 3-wire or 2-wire MPU interface. The MODE pin
selects the interface format, as shown in Table 10. .
3-WIRE (SPI COMPATIBLE) SERIAL CONTROL MODE
In 3-wire mode, every rising edge of CL clocks in one data bit from the DI pin. A rising edge on CE
latches in a complete control word consisting of the last 16 bits. The 3-wire interface protocol is
shown in Figure 20.
Figure 20 3-wire SPI Compatible Interface
1.
2.
3.
Table 10 Control Interface Selection via MODE Pin
MODE
CE
CL
DI
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
2 wire interface
3 wire interface
B14
Control Mode
control register address
B13
B12
B11
B10
B9
B8
B7
B6
control register data bits
B5
B4
PD, Rev 4.1, September 2008
B3
B2
B1
B0
WM8776
latch
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