OUT_SEL | select one of the 256 output to 40 GPIO |
INV_SEL | invert the output value if you want to revert the output value setting the value to 1 |
OEN_SEL | weather using the logical oen signal or not using the value setting by the register |
OEN_INV_SEL | invert the output enable value if you want to revert the output enable value setting the value to 1 |