
7540 Group User
’
s Manual
2-26
APPLICATION
2.2 Timer A
Fig. 2.2.17 Setting method for event counter mode (1)
2.2.5 Event counter mode
(1) Operation description
Timer A counts signals input from the P0
0
/CNTR
1
pin.
Except for this, the operation in event counter mode is the same as in timer mode.
The active edge of CNTR
1
pin input signal can be selected from rising or falling by the CNTR
1
active
edge switch bit.
Timer A can stop counting by setting
“
1
”
to the timer A count stop bit.
Also, when Timer A underflows, the timer A interrupt request bit is set to
“
1
”
.
(2) Event counter mode setting method
Figure 2.2.17 and Figure 2.2.18 show the setting method for event counter mode of timer A.
b
1
7
b0
0
b
7
b0
0
1
b
7
b
0
b
7
b0
0
b
7
b0
0
P
r
o
c
e
s
s
1
:
D
i
s
a
b
l
e
t
i
m
e
r
A
i
n
t
e
r
r
u
p
t
a
n
d
C
N
T
R
1
i
n
t
e
r
r
u
p
t
.
Interrupt control register 1 (ICON1) [Address 3E
16
]
C
N
T
R
1
i
n
t
e
r
r
u
p
t
d
i
s
a
b
l
e
d
P
o
r
t
P
0
d
i
r
e
c
t
i
o
n
r
e
g
i
s
t
e
r
(
P
0
D
)
[
A
d
d
r
e
s
s
0
1
1
6
]
S
e
t
t
h
e
P
0
0
/
C
N
T
R
1
p
i
n
t
o
t
h
e
i
n
p
u
t
m
o
d
e
P
r
o
c
e
s
s
2
:
S
e
t
t
h
e
C
N
T
R
1
p
i
n
t
o
t
h
e
i
n
p
u
t
m
o
d
e
.
Interrupt control register 2 (ICON2) [Address 3F
16
]
i
e
r
A
i
n
t
e
r
r
u
p
t
d
i
s
a
b
l
e
d
T
m
P
r
o
c
e
s
s
3
:
S
e
t
p
u
l
l
-
u
p
c
o
n
t
r
o
l
r
e
g
i
s
t
e
r
.
P
u
l
l
-
u
p
c
o
n
t
r
o
l
r
e
g
i
s
t
e
r
(
P
U
L
L
)
[
A
d
d
r
e
s
s
1
6
1
6
]
P
0
1
0
0
/
:
P
:
P
C
u
u
N
l
-
l
-
T
u
u
R
1
p
O
p
O
p
f
f
n
u
l
l
-
u
p
c
o
n
t
r
o
l
b
i
t
l
l
P
r
o
c
e
s
s
4
:
S
e
t
t
i
m
e
r
A
m
o
d
e
r
e
g
i
s
t
e
r
.
T
i
m
e
r
A
m
o
d
e
r
e
g
i
s
t
e
r
(
T
A
M
)
[
A
d
d
r
e
s
s
1
D
1
6
]
E
C
0
v
N
:
e
T
R
F
F
R
m
n
t
c
o
a
g
g
g
g
u
c
p
e
c
n
t
e
e
p
d
o
t
v
e
e
r
i
d
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e
r
g
u
n
r
m
e
d
e
o
d
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t
s
o
g
m
a
c
m
a
c
t
o
d
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e
t
i
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t
i
v
p
e
a
v
R
1
s
i
a
l
l
a
l
l
i
s
i
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r
i
d
s
e
s
e
a
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l
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r
o
u
f
o
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e
r
r
e
r
t
d
C
d
C
e
d
i
n
i
n
i
n
n
A
o
u
f
N
T
R
1
i
n
t
e
r
r
u
p
t
1
:
i
N
T
R
1
i
n
t
e
r
r
u
p
t
T
i
P
r
o
c
e
s
s
5
:
S
e
t
t
h
e
c
o
u
n
t
v
a
l
u
e
t
o
t
i
m
e
r
A
(
N
o
t
e
)
.
S
e
t
t
h
e
c
o
u
n
t
v
a
l
u
e
t
o
t
i
m
e
r
A
(
l
o
w
-
o
r
d
e
r
)
T
i
m
e
r
A
(
l
o
w
-
o
r
d
e
r
)
(
T
A
L
)
(
A
d
d
r
e
s
s
1
E
1
6
)
C
o
u
n
t
v
a
l
u
e
T
i
m
e
r
A
(
h
i
g
h
-
o
r
d
e
r
)
(
T
A
H
)
(
A
d
d
r
e
s
s
1
F
1
6
)
N
o
t
e
:
W
r
i
t
e
b
o
t
h
r
e
g
i
s
t
e
r
s
i
n
o
r
d
e
r
o
f
t
i
m
e
r
X
(
l
o
w
-
o
r
d
e
r
)
a
n
d
t
h
e
t
i
m
e
r
X
(
h
i
g
h
-
o
r
d
e
r
)
f
o
l
l
o
w
i
n
g
,
c
e
r
t
a
i
n
l
y
.
C
o
u
n
t
v
a
l
u
e
S
e
t
t
h
e
c
o
u
n
t
v
a
l
u
e
t
o
t
i
m
e
r
A
(
h
i
g
h
-
o
r
d
e
r
)