Advantech PCA-6359 REM Watchdog timer example program, GOSUB 1000 REM Your application task #1

After data entry, your program must refresh the watchdog timer by rewriting the I/O port 443 (hex) while simultaneously setting it. When you want to disable the watchdog timer, your program should read I/O port 443 (hex).

The following example shows how you might program the watchdog timer in BASIC:

10REM Watchdog timer example program

20OUT &H443, data REM Start and restart the watchdog

30GOSUB 1000 REM Your application task #1,

40OUT &H443, data REM Reset the timer

50GOSUB 2000 REM Your application task #2,

60OUT &H443, data REM Reset the timer

70X=INP (&H443) REM, Disable the watchdog timer

80END

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 85