130PPC-153 User's ManualB.1 Programming the Watchdog TimerTo program the watchdog timer, you must write a program which writesI/O port address 443 (hex). The output data is a time interval value. Thevalue range is from 01 (hex) to 3E (hex), and the related time interval isfrom 1 sec. to 62 sec.Data Time Interval01 1 sec.02 2 sec.03 3 sec.04 4 sec.• •• •• •3E 62 sec.After data entry, your program must refresh the watchdog timer byrewriting the I/O port 443 (hex) while simultaneously setting it. Whenyou want to disable the watchdog timer, your program should read I/Oport 443 (hex).
