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54 MIC-3318 User's Manual
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