Advantech PCA-6010, User Manual, Page: 76 / 96

PCA-6010 User Manual 66
A.1 Programming the Watchdog Timer
The PCA-6010 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 pro-
gram it.
A.1.1 Watchdog timer overview
The watchdog timer is built in to the super I/O controller W83627HG. 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 reset signal if the software fails to reset the timer
before time-out.
A.1.2 Jumper selection
The JWDT1 jumper is used to select reset in the event the watchdog timer is tripped.
See Chapter 1 for detailed jumper settings.
A.1.3 Programming the Watchdog Timer
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).