We need ADuCM33x GPIO Block Diagram.
Because, we explain the detail of GPIO behavior with register control for OEM.
However, "GPIO Block Diagram" is not described in datasheet and User-Guide(HRM).
We are requesting a manufacturer's official block diagram from OEM.
I found GPIO Block Digaram below devices.
.ADuC7039 Page69 of http://www.analog.com/media/en/technical-documentation/data-sheets/ADuC7039.pdf
.ADuCM360 Page101 of http://www.analog.com/media/en/technical-documentation/user-guides/UG-367.pdf
I attach below these block diagram.