AAEON PFM-HDS - Manual (Page 100)

P C / 1 0 4 M o d u l e P F M - H D S
Appendix E Digital I/O Ports E -3
E.2 DIO Programming
PFM-HDS utilizes FINTEK F81866D chipset as its Digital I/O
controller. Below are the procedures to complete its configuration
and the AAEON initial DIO program is also attached based on
which you can develop customized program to fit your application.
There are three steps to complete the configuration setup: (1) Enter
the MB PnP Mode; (2) Modify the data of configuration registers; (3)
Exit the MB PnP Mode. Undesired result may occur if the MB PnP
Mode is not exited normally.