Watchdog Control Sample; Using The Watchdog Function; Reload Timer - AXIOMTEK SBC82810 Series User Manual

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SBC82810 Pentium M All-in-One Half-Size Board User's Manual

Watchdog Control Sample

Using the Watchdog Function

Function
Setting Base PCI Reg. 60h , bit 2
Time Bit2=0
Bit2=1
Read WDT PCI Reg. 10h ~ 13h
BaseAdress
WDT unlock BaseAddress + 0Ch
80h
BaseAddress + 0Ch
86h
Set Timer BaseAddress + 04h ~
Value 07h
Set Free PCI Reg.68h, bit 3,2
Running
Bit2=1, Free Running
mode
mode

Reload Timer

Function
66
Reg.
Max. TimeVaule =
1ms (default) 0FFFFFh * 1 ms
1 us mov ebx,TimeValue
mov eax,8000EC10h
mov dx,0cf8h
out dx,eax
mov dx,0cfch
in eax,dx
mov edi,eax ;; store
BaseAddress to edi
push es ; backup es
Reg.
xor ax,ax
mov es,ax
mov ax,8680h
mov es:[edi+0ch],al
mov es:[edi+0ch],ah
mov es:[edi+04h],ebx
pop es
Reg.
mov eax,8000EC68h
mov dx,0cf8h
out dx,eax
mov dl,0fch
mov al,04h
Running mode
out dx,al
Reg.
Assembler
; restore es
;; Free
Assembler
Watchdog Timer