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46 PC/104-Plus – CPU-1461 Module
MOV DX,IO_SPIO_WDT_BASE ; Timeout Period Register
MOV AL,DesideredTimeout ; 2..255 seconds/minutes
OUT DX,AL
Use following code to refresh the Watch Dog :
; Reload original Timeout...
MOV DX,IO_SPIO_WDT_BASE
MOV AL,DesideredTimeout ; 2..255 seconds/minutes
OUT DX,AL
Use the following code to disable the Watch Dog (no additional refresh required):
; Set Timeout to 0 Seconds ...
MOV DX,IO_SPIO_WDT_BASE ; Timeout Period Register
MOV AL,0
OUT DX,AL
• Note: for further information about the Watch Dog programming, refer to “PC87364 128-Pin LPC
SuperI/O”
manual by National Semiconductor.