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WM8904ECS/R 数据表(PDF) 86 Page - Wolfson Microelectronics plc |
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WM8904ECS/R 数据表(HTML) 86 Page - Wolfson Microelectronics plc |
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86 / 188 page  WM8904 Pre-Production w PP, Rev 3.3, September 2012 86 The DC Servo control fields associated with start-up operation are described in Table 52. It is important to note that, to minimise audible pops/clicks, the Start-Up and DAC Write modes of DC Servo operation should be commanded as part of a control sequence which includes muting and shorting of the headphone outputs; a suitable sequence is defined in the default Start-Up sequence. REGISTER ADDRESS BIT LABEL DEFAULT DESCRIPTION R68 (44h) DC Servo 1 7 DCS_TRIG_STAR TUP_3 0 Writing 1 to this bit selects Start-Up DC Servo mode for LINEOUTR. In readback, a value of 1 indicates that the DC Servo Start-Up correction is in progress. 6 DCS_TRIG_STAR TUP_2 0 Writing 1 to this bit selects Start-Up DC Servo mode for LINEOUTL. In readback, a value of 1 indicates that the DC Servo Start-Up correction is in progress. 5 DCS_TRIG_STAR TUP_1 0 Writing 1 to this bit selects Start-Up DC Servo mode for HPOUTR. In readback, a value of 1 indicates that the DC Servo Start-Up correction is in progress. 4 DCS_TRIG_STAR TUP_0 0 Writing 1 to this bit selects Start-Up DC Servo mode for HPOUTL. In readback, a value of 1 indicates that the DC Servo Start-Up correction is in progress. 3 DCS_TRIG_DAC_ WR_3 0 Writing 1 to this bit selects DAC Write DC Servo mode for LINEOUTR. In readback, a value of 1 indicates that the DC Servo DAC Write correction is in progress. 2 DCS_TRIG_DAC_ WR_2 0 Writing 1 to this bit selects DAC Write DC Servo mode for LINEOUTL. In readback, a value of 1 indicates that the DC Servo DAC Write correction is in progress. 1 DCS_TRIG_DAC_ WR_1 0 Writing 1 to this bit selects DAC Write DC Servo mode for HPOUTR. In readback, a value of 1 indicates that the DC Servo DAC Write correction is in progress. 0 DCS_TRIG_DAC_ WR_0 0 Writing 1 to this bit selects DAC Write DC Servo mode for HPOUTL. In readback, a value of 1 indicates that the DC Servo DAC Write correction is in progress. R67 (43h) DC Servo 0 3 DCS_ENA_CHAN _3 0 DC Servo enable for LINEOUTR 0 = disabled 1 = enabled 2 DCS_ENA_CHAN _2 0 DC Servo enable for LINEOUTL 0 = disabled 1 = enabled 1 DCS_ENA_CHAN _1 0 DC Servo enable for HPOUTR 0 = disabled 1 = enabled 0 DCS_ENA_CHAN _0 0 DC Servo enable for HPOUTL 0 = disabled 1 = enabled |
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