Appendix A Programming The Watchdog Timer; Programming The Watchdog Timer; Watchdog Timer Overview - Advantech AIMB-501 User Manual

A.1

Programming the Watchdog Timer

AIMB-501'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.
A.1.1

Watchdog Timer Overview

The watchdog timer is built into the super I/O controller Nuvoton NCT6776F. It pro-
vides the following user-programmable functions:
 Can be enabled and disabled by user 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
A.1.2 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).
AIMB-501 User Manual 74