AAEON IMBA-Q77 - Manual (Page 114)

I n d u s t r i a l M o t h e r b o a r d I M B A - Q 7 7
Appendix E Digital Input & Output E-3
E.2 Digital I/O Register
GPIO Device Configuration Register (LDN 0x09)
Register 0x[HEX] Register Name
F0
DIO I/O register
0: The respective DIO PIN is programmed
as an output port.
1: The respective DIO PIN is programmed
as an input port.
GPIO3 Data register
For output ports, the respective bits can be
read and written by the pins.
F1
For input ports , the respective bits can only
be read by the pins. Write accesses are
ignored.