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WM8904ECS/R 数据表(PDF) 101 Page - Wolfson Microelectronics plc |
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WM8904ECS/R 数据表(HTML) 101 Page - Wolfson Microelectronics plc |
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101 / 188 page  Pre-Production WM8904 w PP, Rev 3.3, September 2012 101 LOOPBACK Setting the LOOPBACK register bit enables digital loopback. When this bit is set, the ADC digital data output is routed to the DAC digital data input path. The digital audio interface input (DACDAT) is not used when LOOPBACK is enabled. REGISTER ADDRESS BIT LABEL DEFAULT DESCRIPTION R24 (18h) Audio Interface 0 8 LOOPBACK 0 Digital Loopback Function 0 = No loopback 1 = Loopback enabled (ADC data output is directly input to DAC data input). Table 59 Loopback Control Note: When the digital sidetone is enabled, ADC data will also be added to DAC digital data input path within the Digital Mixing circuit. This applies regardless of whether LOOPBACK is enabled. DIGITAL PULL-UP AND PULL-DOWN The WM8904 provides integrated pull-up and pull-down resistors on each of the MCLK, DACDAT, LRCLK and BCLK pins. This provides a flexible capability for interfacing with other devices. Each of the pull-up and pull-down resistors can be configured independently using the register bits described in Table 60. REGISTER ADDRESS BIT LABEL DEFAULT DESCRIPTION R126 (7Eh) Digital Pulls 7 MCLK_PU 0 MCLK pull-up resistor enable 0 = pull-up disabled 1 = pull-up enabled 6 MCLK_PD 0 MCLK pull-down resistor enable 0 = pull-down disabled 1 = pull-down enabled 5 DACDAT_PU 0 DACDAT pull-up resistor enable 0 = pull-up disabled 1 = pull-up enabled 4 DACDAT_PD 0 DACDAT pull-down resistor enable 0 = pull-down disabled 1 = pull-down enabled 3 LRCLK_PU 0 LRCLK pull-up resistor enable 0 = pull-up disabled 1 = pull-up enabled 2 LRCLK_PD 0 LRCLK pull-down resistor enable 0 = pull-down disabled 1 = pull-down enabled 1 BCLK_PU 0 BCLK pull-up resistor enable 0 = pull-up disabled 1 = pull-up enabled 0 BCLK_PD 0 BCLK pull-down resistor enable 0 = pull-down disabled 1 = pull-down enabled Table 60 Digital Audio Interface Pull-Up and Pull-Down Control |
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