In output mode, the output is driven by a register bit setting. The direction control and the output enable must both be set = 1 for the register setting to appear as an output on the MIO pin.
The direction control can be used to disable the input logic level from being recorded in the data read only (DATA_n_RO) register.
The output enable can be used to control whether an output value is driven on the pin. The actual I/O pad direction is the logical combination of both these signals. The output enable value is ignored when the direction mode is set to input.