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CS5376A Datasheet(PDF) 70 Page - Cirrus Logic |
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CS5376A Datasheet(HTML) 70 Page - Cirrus Logic |
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70 / 107 page  CS5376A 70 Any GPIO pin can be used as an open-drain output by setting the data value to 0, enabling the pull-up, and using the GP_DIR direction bits to control the pin value. This open-drain output configuration uses the internal pull-up resistor to hold the pin high when GP_DIR is set as an input, and drives the pin low when GP_DIR is set as an output. 19.5.1 GPIO Reads in Output Mode When reading GPIO pins the GP_DATA register value always reports the current state of the pins, so a value written in output mode does not necessarily read back the same value. If a pin in output mode is written as a logical 1, the CS5376A attempts to drive the pin high. If an external device forces the pin low, the read value reflects the pin state and re- turns a logical 0. Similarly, if an output pin is writ- ten as a logical 0 but forced high externally, the read value reflects the pin state and returns a logical 1. In both cases the CS5376A is in contention with the external device resulting in increased power consumption. |
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