INSTALLATIONS
24 ROBO-3600VLA User’s Manual
Watchdog Timer Configuration
The function of the watchdog timer is to reset the system automatically
and is defined at I/O port 0443H. To enable the watchdog timer and
allow the system to reset, write I/O port 0443H. To disable the timer,
write I/O port 0441H for the system to stop the watchdog function. The
timer has a tolerance of 20% for its intervals.
The following describes how the timer should be programmed.
Enabling Watchdog:
MOVAX, 000FH (Choose the values from 0)
MOVDX, 0443H
OUT DX, AX
Disabling Watchdog
MOVAX, 00FH (Any value is fine.)
MOV
DX, 0441H
OUT DX, AX
WATCHDOG TIMER CONTROL TABLE
Level
Value
Time/sec
Level
Value
Time/sec
1
F
0
9
7
16
2
E
2
10
6
18
3
D
4
11
5
20
4
C
6
12
4
22
5
B
8
13
3
24
6
A
10
14
2
26
7
9
12
15
1
28
8
8
14
16
0
30
Содержание ROBO-3600VLA
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