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WM8952 Datasheet(PDF) 50 Page - Wolfson Microelectronics plc |
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WM8952 Datasheet(HTML) 50 Page - Wolfson Microelectronics plc |
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50 / 72 page  WM8952 Pre Production w PP, Rev 3.1, June 2011 50 Figure 27 Example Usage of MODE Pin to Generate a Clock Out in 3-wire Mode This example shows how the MODE_GPIO register bit interfaces to the MODE pad in the case there MODE is used as a GPIO output. When MODE_GPIO is set, the internal version of MODE is overridden to high and the MODE pin output driver is enabled. The pull up, which is used to default 3-wire mode at start-up, is disabled as a power saving measure. MODE_GPIO cannot be set in 2- wire mode - this would prevent correct operation of the control interface. Internal timing is arranged to ensure that the override is in place before the pull-up is disabled. REGISTER ADDRESS BIT LABEL DEFAULT DESCRIPTION R8 GPIO Control 7 MODE_GPIO 0 Selects MODE pin as a GPIO pin 0 = MODE is an input. MODE selects 2- wire mode when low and 3-wire mode when high. 1 = MODE can be an input or output under the control of the GPIO control register. Interface operates in 3-wire mode regardless of what happens on the MODE pin. Table 40 Mode is GPIO Control Auto-incremental writes are supported in 2 wire and 3 wire modes. This is enabled by default. REGISTER ADDRESS BIT LABEL DEFAULT DESCRIPTION R9 Control Interface 1 AUTOINC 1 Auto-Incremental write enable 0=Auto-Incremental writes disabled 1=Auto-Incremental writes enabled Table 41 Control Interface |
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