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Appendix A Programming the Watchdog Timer
7 5
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 444 (hex).
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 444 (hex).
The following example shows how you might program the watchdog
timer in BASIC:
timer in BASIC:
10
REM Watchdog timer example program
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OUT &H443, data REM Start and restart the watchdog
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GOSUB 1000 REM Your application task #1,
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OUT &H443, data REM Reset the timer
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GOSUB 2000 REM Your application task #2,
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OUT &H443, data REM Reset the timer
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X=INP (&H443) REM, Disable the watchdog timer
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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