Acnodes FPC 7919 Manual de usuario descargar pdf (Pagina 59)

661 Brea Canyon Rd., Suite 3

Walnut, CA 91789

tel: 909.598.7388, fax: 909.598.0218, www.acnodes.com

are subject to change without notice. For latest product information,

please visit Acnodes’ web site at www.acnodes.com.

FPC7919

Fanless 19-inch touch panel PC

Atom N270 1.6GHz all-in-one system

3.8 Watchdog Timer Configuration

The Watch-dog Timer has a programmable time-out ranging from 1 to 255 minutes with one minute

resolution, or 1 to 255 seconds with 1 second resolution. The units of the WDT timeout value are

selected via bit[7] of the WDT_TIMEOUT register, which is located on I/O Port address 0x865h. The

WDT time-out value is set through the WDT_VAL Runtime register, which is located on I/O Port

address 0x866h. Setting the WDT_VAL register to 0x00 disables the WDT function Setting the

WDT_VAL to any other non-zero value will cause the WDT to reload and begin counting down from the

value loaded. Setting the Register located on I/O address 0x867h and 0x868h as 00h to finish timer

configuration.

Example Program

Example Code: (1)

; ------------------------------------------------------------------------------------------------

; Enable Watch-Dog Timer

;-------------------------------------------------------------------------------------------------

mov dx, (800h+65h) ; Time counting Unit minute or second

mov al, 80h; al = 00h : minute, or al = 80h : second

out dx, al

mov dx, (800h+66h)

mov al, 20 ; al = Watch Dog Timer Second (s) , 20 sec(s)

ou dx, al

mov dx, (800h+67h)

mov al, 00h

out dx, al

mov dx, (800h+68h) ; Start Watch Dog Timer

mov al, 00h

out dx, al

(2)

;--------------------------------------------------------------------------------------------------

; Disable Watch-Dog Timer

;--------------------------------------------------------------------------------------------------

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Acnodes FPC 7919 Manual de usuario Pagina 59