Advantech AIMB-760 User Manual

The AIMB-760's watchdog timer can be used to monitor system software 
operation and take corrective action if the software fails to function 
within the programmed period. This section describes the operation of the 
watchdog timer and how to program it.

The watchdog timer is built in to the super I/O controller W83627HF. It 
provides the following functions for user programming:
•  Can be enabled and disabled by user's program
•  Timer can be set from 1 to 255 seconds or 1 to 255 minutes
•  Generates an interrupt or resets signal if the software fails to reset the 

timer before time-out

The J2 jumper is used to select reset or interrupt (IRQ 11) in the event the 
watchdog timer is tripped. See Chapter 1 for detailed jumper settings.

The I/O port address of the watchdog timer is 2E(hex) and 2F(hex). 
2E (hex) is the address port. 2F(hex) is the data port. You must first 
assign the address of register by writing an address value into address 
port 2E (hex), then write/read data to/from the assigned register through 
data port 2F (hex).