Aaeon IMBA-880 Manual page 42

I n d u s t r i a l M o t h e r b o a r d
(2) Modify the data of configuration registers
(3) Exit the W83627EHG config Mode. Undesired result may
occur if the config Mode is not exited normally.
(1) Enter the W83627EHG config Mode
To enter the W83627EHG config Mode, two special I/O write
operations are to be performed during Wait for Key state.
To ensure the initial state of the key-check logic, it is
necessary to perform two write operations to the Special
Address port (2EH). The different enter keys are provided to
select configuration ports (2Eh/2Fh) of the next step.
87h,87h:
(2) Modify the Data of the Registers
All configuration registers can be accessed after entering the
config Mode. Before accessing a selected register, the
content of Index 07h must be changed to the LDN to which
the register belongs, except some Global registers.
(3) Exit the W83627EHG config Mode
The exit key is provided to select configuration ports
(2Eh/2Fh) of the next step.
0aah:
WatchDog Timer Register I (Index=F5h, Default=00h)
CRF5 (PLED mode register. Default 0 x 00)
Bit 7-6
Address Port
2Eh
Address Port
2Eh
: select PLED mode
= 00 Power LED pin is tri-stated.
Appendix A Programming the Watchdog Timer
I M B A - 8 8 0
Data Port
2Fh
Data Port
2Fh
A-3