FabiaTech Fanless FX5613, Руководство пользователя

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FabIATech Corporation
44
Watchdog Timer Enabled
To enable the watchdog timer, you have to output a byte of timer factor to the
watchdog register whose address is 4Eh and data port is 4fH. The following is an
Assemble program, which demonstrates how to enable the watchdog timer and set
the time-out period at 28 seconds.
;------------------------------------------------------------------------------------------
; Enter the extended function mode, interruptible double-write
;------------------------------------------------------------------------------------------
Mov dx, 4eh ; Enter to extended function mode
Mov al, 87h
Out dx,al
Out dx,al
Mov al,07h ; Select register index 0x07
Out dx,al
;----------------------------------------------------------------------------------------------------------------
; Logical device 8, configuration IO Port 300H register, CR60 Bit 1,2,CR61 Bit 0~7
;----------------------------------------------------------------------------------------------------------------
Mov dx,4fh ; Select LDN 8
Mov al,08h
Out dx,al
Mov dX,4eh
Mov al,60h ; Select LDN 8 register index 0x60
Out dx,al
Mov dx,4fh
Mov al,03h ; Set Watch Dog timer base address high byte to 0x03h
Out dx,al
Mov dX,4eh
Mov al,61h ; Select LDN 8 register index 0x61
Out dx,al
Mov dx,4fh
Mov al,00h ; Set Watch Dog Timer base address low byte to 0x00h
Out dx,al
----------------------------------------------------------------------------------------------------------------
; Logical device 8, configuration register, CR30 Bit 0,
Enable Watch Dog Timer Device
;----------------------------------------------------------------------------------------------------------------
Mov dX,4eh
Mov al,30h ; Select LDN 8 register index 0x30
Out dx,al
Mov dx,4fh
Mov al,01h ; Enable Watch Dog Timer Device
Out dx,al
;------------------------------------------
; Exit extended function mode
;------------------------------------------
Mov dx,4eh
Mov al,0aah
Out dx,al