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How to Programming the Watchdog Timer

2550-08-06 Programming Document No.1-0002971

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  • How to Programming the Watchdog Timer

    Programming the Watchdog Timer
    To program the watchdog timer, you must write a program which writes I/O port address 443 (hex). The output data is a time interval value. The value range is from 01 (hex) to 3F (hex), and the related time interval is 1 sec. to 63 sec.

    Data Time Interval
    01 1 sec.
    02 2 sec.
    03 3 sec.
    04 4 sec.
    .
    .
    .
    3F 63 sec.

    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:

    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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