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WM8774IFT 数据表(PDF) 19 Page - Wolfson Microelectronics plc |
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WM8774IFT 数据表(HTML) 19 Page - Wolfson Microelectronics plc |
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19 / 42 page ![]() Product Preview WM8774 PP Rev 1.0 June 2002 19 B15 B14 B13 B12 B11 B10 B9 B8 B7 B6 B5 B4 B3 B2 B1 B0 CE CL DI Figure 16 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. CONTROL INTERFACE REGISTERS DIGITAL AUDIO INTERFACE CONTROL REGISTER Interface format is selected via the FMT[1:0] register bits: REGISTER ADDRESS BIT LABEL DEFAULT DESCRIPTION 10110 Interface Control 1:0 FMT[1:0] 10 Interface format Select 00 : right justified mode 01: left justified mode 10: I 2S mode 11: DSP (early or late) mode In left justified, right justified or I 2S modes, the LRP register bit controls the polarity of ADCLRC/DACLRC. If this bit is set high, the expected polarity of ADCLRC/DACLRC will be the opposite of that shown, Figure 10 and. Note that if this feature is used as a means of swapping the left and right channels, a 1 sample phase difference will be introduced. In DSP modes, the LRP register bit is used to select between early and late modes. REGISTER ADDRESS BIT LABEL DEFAULT DESCRIPTION In left/right/ I 2S modes: ADCLRC/DACLRC Polarity (normal) 0 : normal ADCLRC/DACLRC polarity 1: inverted ADCLRC/DACLRC polarity 10110 Interface Control 2 LRP 0 In DSP mode: 0 : Early DSP mode 1: Late DSP mode By default, ADCLRC/DACLRC and DIN is sampled on the rising edge of BCLK and should ideally change on the falling edge. Data sources that change ADCLRC/DACLRC and DIN on the rising edge of BCLK can be supported by setting the BCP register bit. Setting BCP to 1 inverts the polarity of BCLK to the inverse of that shown in, Figure 10, Figure 11, Figure 12, Figure 13, Figure 14 and Figure 15. REGISTER ADDRESS BIT LABEL DEFAULT DESCRIPTION 10110 Interface Control 3 BCP 0 BCLK Polarity (DSP modes) 0 : normal BCLK polarity 1: inverted BCLK polarity |
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