Acrosser AR-B1551 - Manual (Page 27)

AR-B1551 User’s Guide
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Users could test watchdog function under ‘Debug’ program as follow:
C:>debug
!
O 214 C8H
Generally, watchdog function would
reset system after 8 seconds
! O 214 0H
Disable watchdog function
C:>debug
!
O 214 88H
Generally, watchdog function would
generate IRQ 9 after 8 seconds
! O 214 0H
Disable watchdog function
3.3.2 Watchdog Timer Trigger
After you enable the watchdog timer, your program must write the same factor as enabling to the watchdog register
at least once every time-out period to its previous setting. You can change the time-out period by writing another
timer factor to the watchdog register at any time, and you must trigger the watchdog before the new time-out period
in next trigger.