Advantech PCA-6751 Series - Chapter 6 PCI Bus Ethernet Interface With RTL-8139 (PCA-6751 only)

60 PCA-6751/PCA-6751V User's Manual
A.1 Programming the Watchdog Timer
To program the watchdog timer, you must write a program which
writes I/O port address 443 (hex). The output data is a value of time
interval. The value range is from 01 (hex) to 3E (hex), and the related
time interval is 1 sec. to 62 sec.
Data Time Interval
01 1 sec.
02 2 sec.
03 3 sec.
04 4 sec.
••
••
••
3E 62 sec.