BOSER Technology BPF-3215-V, Руководство пользователя

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26
z CN6: External Reset Button
PIN Description
4 3
1 2
1 GND
2 Reset Switch
3 GND
4 GND
4.16 Watchdog Timer
Once the Enable cycle is active a Refresh cycle is requested before the
time-out period. This restarts counting of the WDT period. When the
time counting goes over the period preset of WDT, it will assume that
the program operation is abnormal. A system reset signal will restart
when such error happens.
The following sample programs show how to enable, disable and
refresh the watchdog timer:
W83627HG-AW Watchdog Timer
1. Assembly sample code:
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Extended function mode
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MOV DX, 2EH
MOV AL, 87H
OUT DX, AL
OUT DX, AL
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Configure logical device 8
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MOV DX, 2EH
MOV AL, 07H
OUT DX, AL
MOV DX, 2FH
MOV AL, 08H
OUT DX, AL
MOV DX, 2EH
MOV AL, 30H ; Enable WDT
OUT DX, AL
MOV DX, 2FH
MOV AL, 01H
OUT DX, AL
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Configure time mode
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MOV DX, 2EH
MOV AL, F5H
OUT DX, AL
MOV DX, 2FH
MOV AL, 00H ; Setup second mode, 08H for minute mode
OUT DX, AL