A.1 Overview
The
The watchdog timer is
•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
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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