Appendix A: Watchdog Timer Wdt Programming Guide - Nexcom NViS 2280 User Manual

Appendix A: Watchdog Timer
Appendix A: Watchdog Timer
WDT Programming Guide
NViS 2280 Watch Dog Function Configuration Sequence Description:
Step1. See "SetupWDT" procedure
#Setup Watchdog Timer Environment
Step2. See "TimeBaseWDT" procedure
#Initial Watchdog Timer.
Users can select second or minute.
Step3. See "TimeCountWDT"
procedure
#Set Watchdog Timer Time-out Value.
Users can set time-out value.
Step4: See ExitSetup procedure
#Exit Setup Environment
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Star
t
(ref)
End
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SetupWDT PROC
mov dx, 2eh
mov al, 087h
out dx, al
nop
nop
out dx, al
mov al, 07h
out 2eh, al
mov al, 08h ;Select logical device for Watch Dog.
out 2fh, al
ret
SetupWDT ENDP
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TimeBaseWDT PROC
mov al, 0F5h
out 2eh, al
mov al, 02h ;Set WDT reset upon KBRST#
or al, 00h ;Here!! set 00h for second, set 08h for minute
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NViS 2280 User Manual