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WM8776 Datasheet(PDF) 23 Page - Wolfson Microelectronics plc |
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WM8776 Datasheet(HTML) 23 Page - Wolfson Microelectronics plc |
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23 / 57 page  Production Data WM8776 w PD Rev 4.0 April 2005 23 Figure 19 DSP/PCM Mode Audio Interface (mode B, LRP=0, Slave) CONTROL INTERFACE OPERATION 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. . MODE Control Mode 0 2 wire interface 1 3 wire interface Table 10 Control Interface Selection via MODE Pin 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. B[15:9] are Control Address Bits 2. B[8:0] are Control Data Bits 3. CE is edge sensitive – the data is latched on the rising edge of CE. B15 B14 B13 B12 B11 B10 B9 B8 B7 B6 B5 B4 B3 B2 B1 B0 DI CL CE control register address control register data bits latch |
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