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CS5378 データシート(PDF) 65 Page - Cirrus Logic |
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CS5378 データシート(HTML) 65 Page - Cirrus Logic |
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65 / 86 page  CS5378 DS639F1 65 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 CS5378 attempts to drive the pin high. If an external device forces the pin low, the read value reflects the pin state and returns a logical 0. Similarly, if an output pin is written as a logical 0 but forced high externally, the read val- ue reflects the pin state and returns a logical 1. In both cases the CS5378 is in contention with the ex- ternal device resulting in increased power con- sumption. |
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