參數(shù)資料
型號: M38857M1-XXXHP
廠商: Renesas Technology Corp.
英文描述: SINGLE-CHIP 8-BIT CMOS MICROCOMPUTER
中文描述: 單芯片8位CMOS微機
文件頁數(shù): 25/103頁
文件大小: 1580K
代理商: M38857M1-XXXHP
3885 Group
SINGLE-CHIP 8-BIT CMOS MICROCOMPUTER
MITSUBISHI MICROCOMPUTERS
24
Fig. 18 Connection example when using key input interrupt and port P3 block diagram
P
l
a
o
r
t
h
P
3
0
t
c
d
r
e
c
t
P
i
o
o
n
r
t
r
e
P
g
3
0
i
s
i
t
e
r
=
0
Port P3
1
latch
d
r
e
c
t
P
i
o
o
n
r
t
r
e
P
g
3
1
i
s
i
t
e
r
=
0
Port P3
2
latch
d
r
e
c
t
P
i
o
o
n
r
t
r
e
P
g
3
2
i
s
i
t
e
r
=
0
Port P3
3
latch
Port P3
3
direction register =
0
P
l
a
o
r
t
h
P
3
4
t
c
d
r
e
c
t
P
i
o
o
n
r
t
r
e
P
g
3
4
i
s
i
t
e
r
=
1
P
l
a
o
r
t
h
P
3
5
t
c
Port P3
5
direction register =
1
P
l
a
o
r
t
h
P
3
6
t
c
Port P3
direction register =
1
P
l
a
o
r
t
h
P
3
7
t
c
Port P3
7
direction register =
1
P
3
0
i
n
p
u
t
P
3
1
i
n
p
u
t
P3
2
input
P3
3
input
P
3
4
o
u
t
p
u
t
P
3
5
o
u
t
p
u
t
P
3
6
o
u
t
p
u
t
P
3
7
o
u
t
p
u
t
P
B
o
r
t
5
c
=
o
n
t
r
o
l
r
e
g
i
s
t
e
r
1
i
t
0
Port P3 input circuit
Comparator circuit
P
o
L
r
t
l
P
e
X
v
x
l
e
o
u
t
p
u
t
P-channel transistor for pull-up
CMOS output buffer
K
e
y
i
n
p
u
t
i
n
t
e
r
r
u
p
t
r
e
q
u
e
s
t
P
B
o
r
t
4
c
=
o
n
t
r
o
l
r
e
g
i
s
t
e
r
1
i
t
1
Key Input Interrupt (Key-on Wake Up)
A Key input interrupt request is generated by applying
L
level to
any pin of port P3 that have been set to input mode. In other
words, it is generated when the logical AND of all port P3 input
goes from
1
to
0
. An example of using a key input interrupt is
shown in Figure 18, where an interrupt request is generated by
pressing one of the keys consisted as an active-low key matrix
which inputs to ports P3
0
P3
3
.
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