Appendix A Programming The Watchdog Timer; Programming The Watchdog Timer; Watchdog Timer Overview; Jumper Selection - Advantech PCA-6011 User Manual

A.1

Programming the Watchdog Timer

The PCA-6011 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 W83627DHG-P. 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.
 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 the 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).
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