32
•
Watchdog and Utilities
Under Windows NT
Before you executing the program under NT, you must run the setup
program under Windows NT in advance. Open a DOS command prompt
window and execute the following command.
test977 <n>
: n = second value. For W83977EF
5.1.2
WDT2 Programming
The watchdog timer would reset the system automatically if the system
program did not refresh the watchdog timer during the watchdog time out
interval. It is set at I/O port
440h
and
443h
to enable/disable the watchdog
time out function. Its clock source 1Hz, and then is devided into 1Hz base to
counter a 8 bits counter such that the timer range is from 1 sec to 256 sec
with resolution 1 sec.
Regarding to the watchdog function, users must have a program to set the
watchdog time out value, and refresh the watchdog timer cycle. If the system
programs goes into a dead loop or goes into an abnormal cycle, the
watchdog timer cannot be refreshed immediately. Meanwhile, the system
will be reset by watchdog timer automatically. The watchdog timer will be
refreshed by “ disable watchdog output” then “enable watchdog output”.
Watchdog Time Out Table
Timer
Value
Time Out
Time
Value
Time Out
Time
Value
Time Out
0
None
8
8sec.
.
.
1
1sec.
9
9sec.
.
.
2
2sec.
A
10sec.
.
.
3
3sec.
B
11sec.
.
.
4
4sec.
C
12sec.
.
.
5
5sec.
D
13sec.
.
.
6
6sec.
E
14sec.
.
.
7
7sec.
F
15sec.
FF
255 sec.
StockCheck.com
Содержание NuIPC cPCI-3500A Series
Страница 2: ...S t o c k C h e c k c o m...
