Advantech MIC-6314 Series, User Manual

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MIC-6314 User Manual 96
B.1 Watchdog Timer Programming Procedure
To program the watchdog timer, users must execute a program that writes a value to
I/O port address 443/444 (hex) to enable/disable. This output value represents a time
interval. The value range is from 01 (hex) to FF (hex), and the related time interval is
1 to 255 seconds.
Data
Time Interval
01 1 sec
02 2 sec
03 3 sec
04 4 sec
...
3F
63 sec
After data entry, the program must refresh the watchdog timer by rewriting and set-
ting the value of I/O port 443/443 (hex). To disable the watchdog timer, the program
should read I/O port 444 (hex). The following example demonstrates how to 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 (&H444) 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