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After data entry, your program must refresh the watchdog timer by
rewriting the I/O port 444 (hex) while simultaneously setting it.
When you want to disable the watchdog timer, your program
should read I/O port 043 (hex).
The following example shows how you might program the
watchdog timer in BASIC:
10
REM Watchdog timer example program
20
OUT &H444, data REM Start and restart the watchdog
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GOSUB 1000 REM Your application task #1,
40
OUT &H444, data REM Reset the timer
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GOSUB 2000 REM Your application task #2,
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OUT &H444, data REM Reset the timer
70
X=INP (&H444) REM, Disable the watchdog timer
80
END
1000 REM Subroutine #1, your application task
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•
•
•
•
•
1070 RETURN
2000 REM Subroutine #2, your application task
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•
•
•
•
•
2090 RETURN
Appendix A Programming the Watchdog Timer
5 9
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