Advantech MIC-3318 manual Programming the Watchdog Timer

A.1 Overview

The MIC-3318's watchdog timer can be used to monitor system software operation and take corrective action if the software fails to function after the programmed period. This section describes the operation of the watchdog timer and how to program it.

The watchdog timer is built-in 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 after time-out.

A.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 address value into address port 2E(hex), then write/read data to/from the assigned register through data port 2F (hex).

Figure A-1: Procedure of programming the watchdog timer

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