WM8766 Wolfson Microelectronics plc, WM8766 Datasheet - Page 19

• Manufacturer Part Number: WM8766
• Description: 24-bit, 192khz 6-channel Dac
• Manufacturer: Wolfson Microelectronics plc

Production Data
SOFTWARE CONTROL INTERFACE OPERATION
CONTROL INTERFACE REGISTERS
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The WM8766 is controlled using a 3-wire serial interface in software mode or pin programmable in
hardware mode.
The control mode is selected by the state of the MODE pin.
3-WIRE (SPI COMPATIBLE) SERIAL CONTROL MODE
MD/DM is used for the program data, MC/IWL is used to clock in the program data and ML/I2S is
used to latch the program data. MD/DM is sampled on the rising edge of MC/IWL. The 3-wire
interface protocol is shown in Figure 18.
Figure 18 3-wire SPI Compatible Interface
ATTENUATOR CONTROL MODE
Setting the ATC register bit causes the left channel attenuation settings to be applied to both left and
right channel DACs from the next audio input sample. No update to the attenuation registers is
required for ATC to take effect.
1.
2.
3.
MD/DM
ML/I2S
MC/IWL
REGISTER ADDRESS
DAC Channel Control
B[15:9] are Control Address Bits
B[8:0] are Control Data Bits
ML/I2S is edge sensitive – the data is latched on the rising edge of ML/I2S.
0000010
B15
B14
B13
B12
BIT
3
B11
LABEL
B10
ATC
B9
B8
DEFAULT
0
B7
B6
Attenuator Control Mode:
B5
0: Right channels use right
1: Right channels use left
B4
attenuations
attenuations
DESCRIPTION
B3
B2
PD Rev 4.1 July 2005
B1
WM8766
B0
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