Odd number bytes go to lower 8bits of the port. Even number bytes go to higher 8bits of the port. If the bit is enabled as output, writing 1 makes the corresponding header pin to high level, writing 0 makes the pin to ground level. Default upon power up is all 0. The device must be opened prior to this operation.
Data read indicates logical level of the port at the time.
Odd number bytes are read from lower 8bits of the port. Even number bytes are read from higher 8bits of the port. If the bit indicates 1, it means the level of the corresponding header pin is logical high level. If the bit indicates 0, it means the level of the pin is logical low. The device must be opened prior to this operation.