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CONFIDENTIAL – DO NOT COPY
Page 7-24
File No. SG-0198
2. DIGITAL AUDIO INTERFACE
1. Slave mode
The audio interfaces operations in either slave mode selectable using the MS control bit. In slave
mode DIN is always an input to the WM8776 and DOUT is always an output. The default is Slave
mode. In slave mode (ms=0) ADCLRC, DACLRC, ADCBCLK, DACBCLK are input to the WM8776
DIN and DACLRC are sampled by the WM8776 on the rising edge of DACBCLK; ADCLRC is
sampled on the rising edge of ADCBCLK. ADC data is output on DOUT and changes on the falling
edge of ADCBCLK. By setting control bit BCLKINV the polarity of ADCBCLK and DACBCLK may
be reversed so that DIN and DACLRC are sample on the falling edge of DACBCLK, ADCLRC is
sampled on the falling edge of ADCBCLK and DOUT changes on the rising of ADCBCLK
Slave mode as shown in the following figure.
2. 2 Wire serial control mode
The wm8776 supports software control via a 2-wire serial bus. Many devices can be controlled by
the same bus, and each device has a unique 7-bit address (this is not the same as the 7-bit
address of each register in the wm8776). The wm8776 operates as a slave device only.
2-wire serial interface as shown in the following figure.