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Appendix
000A0000 - 000BFFFF
000A0000 - 000BFFFF
000C0000 - 000DFFFF
3F700000 - FEBFFFFF
Appendix 4: Watchdog Timer (WDT) Setting
WDT is widely used for industry application to monitoring the activity
of CPU. Application software depends on its requirement to trigger WDT with
adequate timer setting. Before WDT time out, the functional normal system
will reload the WDT. The WDT never time out for a normal system. Then, WDT
will time out and reset the system automatically to avoid abnormal operation.
This board supports 255 levels watchdog timer by software
programming. Below are the source codes written in assembly & C, please
take them for WDT application examples.
Assembly Code
;-- Initial W83627hf --
mov
mov
mov
out
out
;--
mov
mov
mov
out
mov
inc
out
;--
mov
mov
mov
out
mov
inc
out
;--
PCI bus
Mobile Intel® 945 Express Chipset Family
PCI bus
PCI bus
AX, 2Eh
DX, AX
AL, 87h
DX, AX
DX, AX
AX, 2Eh
DX, AX
AL, 2Bh
DX, AL
AL, 00h
DX
DX, AL
AX, 2Eh
DX, AX
AL, 07h
DX, AL
AL, 08h
DX
DX, AL
;
; initial W83627HF start
; Select CR2B
; Set CR2B bit 4=0, PIN89=WDTO
; Point to Logical Device Selector
; Select Logical Device 8
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