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Question: Why doesn't the GPIO interrupt work with High Z Analog drive mode?
In HighZ Analog Mode, the schmitt trigger that interfaces the GPIO with the internal digital logic is disabled. Because of this, interrupt will not work in this mode. For the interrupt to work, the GPIO should be configured as HighZ drive mode.
This is shown in the GPIO block diagram shown below. The drive mode of the GPIO shouldn't be High Z Analog (110b) for the interrupt to work.