This register contains the output value for all pins. These only take effect if the pin is configured as an output.
A '1' bit for a pin indicates that it will behave as an output (drive), while a '0' bit tristates the pin and it becomes a high-impedance input.
This register can be read to obtain the current input value of the GPIO pins.
Configures the pin state that causes an interrupt. If a bit is set in this register, the pin causes an interrupt when high. A zero causes the opposite behavior.