Example Program; A.1.3 Example Program - Advantech PCA-6028 User Manual

F6 (hex)
F7 (hex)
AA (hex)
A.1.3

Example program

1. Enable watchdog timer and set 10 sec. as timeout interval
;-----------------------------------------------------------
Mov dx,2eh
Mov al,87h
Out dx,al
Out dx,al
;-----------------------------------------------------------
Mov al,07h
Out dx,al
Inc dx
Mov al,08h
Out dx,al
;-----------------------------------------------------------
Dec dx
Mov al,30h
Out dx,al
Inc dx
In al,dx
Or al,01h
Out dx,al
;-----------------------------------------------------------
Dec dx
Mov al,0f5h
Out dx,al
Inc dx
In al,dx
And al,not 08h
Out dx,al
;-----------------------------------------------------------
Dec dx
Mov al,0f6h
PCA-6028 User Manual
0: stop timer [default]
01~FF (hex): The amount of the count, in seconds or
minutes, depends on the value set in register F5 (hex).
write This number decides how long the watchdog timer waits
for strobe before generating an interrupt or reset signal.
Writing a new value to this register can reset the timer to
count with the new value.
Bit 6: Write 1 to enable keyboard to reset the timer, 0 to
disable.[default]
Bit 5: Write 1 to generate a timeout signal immediately
read/write
and automatically return to 0. [default=0]
Bit 4: Read status of watchdog timer, 1 means timer is
"timeout".
Write this address to I/O port 2E (hex) to lock the
-----
NCT6776D.
; Unlock NCT6776D
; Select registers of watchdog timer
; Enable the function of watchdog timer
; Set second as counting unit
; Set timeout interval as 10 seconds and start counting
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