Intel PCA-6175 manual Gosub 2000 REM Your application task #2

After data entry, your program must refresh the watchdog timer by rewriting 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 &H043, data REM Reset the timer

70X=INP (&H043) REM, Disable the watchdog timer

80END

1000	REM Subroutine #1, your application task
•	•
•	•
•	•
1070	RETURN
2000	REM Subroutine #2, your application task
•	•
•	•
•	•
2090	RETURN

Appendix A Programming the Watchdog Timer 45