NEXCOM NViS 2280 - Manual (Page 91)

Copyright © 2012 NEXCOM International Co., Ltd. All rights reserved 78 NViS 2280 User Manual
Appendix A: Watchdog Timer
WDT Programming Guide
NViS 2280 Watch Dog Function Configuration Sequence Description:
Appendix A: Watchdog Timer
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
(ref)
Star
t
End
===============================================
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
===============================================
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