Advantech SOM-4450 CPU System On Module SOM-4450 ETX Manual do Utilizador descarregar pdf (Página 27)

Appendix A Programming the Watchdog Timer 21

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:

10 REM Watchdog timer example program

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

30 GOSUB 1000 REM Your application task #1,

40 OUT &H443, data REM Reset the timer

50 GOSUB 2000 REM Your application task #2,

60 OUT &H443, data REM Reset the timer

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

80 END

1000 REM Subroutine #1, your application task

••

1070 RETURN

2000 REM Subroutine #2, your application task

••

2090 RETURN

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Advantech SOM-4450 CPU System On Module SOM-4450 ETX Manual do Utilizador Página 27