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OE_OVERRIDE specifies the value to be overridden by the OE_OVERRIDE_CTRL. For example, if you set OE_OVERRIDE to 1 and then enable OE_OVERRIDE_CTRL, the pin will output a 1. This can be used to force a GPIO high, for example.
Similarly, the IE_OVERRIDE specifies the value. If you set the IE_OVERRIDE to 1, then enable the IE_OVERRIDE_CTRL, the device will behave as if it is seeing a 1 at the input of that pin.
