A.2 watchdog timer control register, A.3 watchdog timer programming procedure, Power on or reset the system – NEXCOM NEX 852VL2 User Manual
Page 59
A.2 Watchdog Timer Control Register
The Watchdog Timer Control Register controls the EDT working mode. Write the value to the WDT Configu-
ration Port. The following table describes the Control Register bit definition.
Table A-2: Control Register Bit Definition
A.3 Watchdog Timer Programming Procedure
Power on or reset the system
The initial value of WDT Control Register (D4~D0) is zero, when power is on or reset the system. The
following shows the initial value of WDT (00000000b):
Table A-3: WDT Control Register Initial Value
58
t
i
B
e
u
l
a
V
n
a
e
M
7
0
T
D
W
e
l
b
a
s
i
D
6
0
e
l
b
a
s
i
d
s
i
t
u
p
t
u
o
t
e
s
e
R
5
0
e
l
b
a
s
i
d
s
i
t
u
p
t
u
o
I
M
N
4
0
e
l
b
a
s
i
d
s
i
t
u
p
t
u
o
e
c
i
t
o
N
T
D
W
3
0
d
n
o
c
e
s
y
b
e
d
o
m
t
n
u
o
c
T
D
W
t
c
e
l
e
S
0
,
1
,
2
0
0
0
e
t
u
n
i
m
/
d
n
o
c
e
s
1
r
e
t
f
a
s
r
u
c
c
o
t
u
o
-
e
m
i
t
t
c
e
l
e
S
7 6 5 4 3 2 1 0
11 0 : S e le c t
11 0 : S e le c t
1 0 1 : S e le c t
1 0 0 : S e le c t
0 11 : S e le c t
0 1 0 : S e le c t
0 0 1 : S e le c t
0 0 0 : S e le c t
1 2 7 s e c o n d s o r m in u te s
6 4 s e c o n d s o r m in u te s
3 2 s e c o n d s o r m in u te s
1 6 s e c o n d s o r m in u te s
8 s e c o n d s o r m in u te s
4 s e c o n d s o r m in u te s
2 s e c o n d s o r m in u te s
1 s e c o n d s o r m in u te s
1 : S e le c t W D T c o u n t m o d e b y m in u te
0 : S e le c t W D T c o u n t m o d e b y s e c o n d
1 : E n a b le w a tc h d o g tim e r
0 : D is a b le w a tc h d o g tim e r
1 : N M I is E n a b le
0 : N M I is D is a b le
1 : R e s e t is E n a b le
0 : R e s e t is D is a b le
1 : W D T is E n a b le
0 : W D T is D is a b le