NEXCOM nROK 500 - Manual (Page 41)

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Appendix B: Watchdog Timer
Copyright © 2012 NEXCOM International Co., Ltd. All rights reserved nROK 500 User Manual
===============================================
SetupWDT PROC
mov dx, 2eh
mov al, 087h
out dx, al
nop
nop
mov al, 01h
out dx, al
nop
nop
mov al, 55h
out dx, al
nop
nop
out dx, al ;Write operations to special address
port (2E) for entering MB PnP Mode.
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, 72h
out 2eh, al
mov al, 40h ;Set WDT reset upon KBRST#
or al, 00h ;Here!! set 00h for second, set 80h for minute
out 2fh, al
ret
TimeBaseWDT ENDP
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TimeCountWDT PROC
mov al, 73h ;WDT Time-out register.
out 2eh, al
mov al, 03h ;Here!! Set count 3.
out 2fh, al
ret
TimeCountWDT ENDP
===============================================
ExitSetup
PROC
mov dx, 2eh
mov al, 0AAh
out dx, al
ExitSetup ENDP
===============================================
c:\>debug [enter]
-o 2e 87 ;Enter the Extended Function Mode
-o 2e 01
-o 2e 55
-o 2e 55
-o 2e 07 ;Logical Device Number Reg
-o 2f 07 ;LDN=7
-o 2e 72 ;Watch dog configuration
-o 2f XX ;minute mode (-o 2f 00 second mode)
-o 2e 73 ;LSB for Watch dog tme out value