Renesas PROM Programming Adapter PCA7447FP Información técnica Pagina 22

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19
SINGLE-CHIP 8-BIT CMOS MICROCOMPUTER
MITSUBISHI MICROCOMPUTERS
38C8 Group
Key Input Interrupt (Key-on Wake-Up)
A key input interrupt request is generated by applying L level to any
pin of port P2 that have been set to input mode. In other words, it is
generated when AND of input level goes from 1 to 0. An example
of using a key input interrupt is shown in Figure 15, where an inter-
rupt request is generated by pressing one of the keys consisted as
an active-low key matrix which inputs to ports P20P23.
Fig. 15 Connection example when using key input interrupt and port P2 block diagram
✽✽
✽✽
✽✽
✽✽
✽✽
✽✽
✽✽
✽✽
P
o
r
t
P
2
0
l
a
t
c
h
P
o
r
t
P
2
1
l
a
t
c
h
P
o
r
t
P
2
2
l
a
t
c
h
Port P2
3
latch
P
o
r
t
P
2
4
l
a
t
c
h
Port P2
5
latch
Port P2
6
latch
P
o
r
t
P
2
7
l
a
t
c
h
P2
0
input
P
2
1
i
n
p
u
t
P
2
2
i
n
p
u
t
P
2
3
i
n
p
u
t
P
2
4
o
u
t
p
u
t
P
2
5
o
u
t
p
u
t
P
2
6
o
u
t
p
u
t
P2
7
output
P
U
L
L
r
e
g
i
s
t
e
r
A
B
i
t
5
=
1
Port P2
Input reading circuit
P
o
r
t
P
X
x
L
l
e
v
e
l
o
u
t
p
u
t
P
-
c
h
a
n
n
e
l
t
r
a
n
s
i
s
t
o
r
f
o
r
p
u
l
l
-
u
p
C
M
O
S
o
u
t
p
u
t
b
u
f
f
e
r
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
o
r
t
P
2
7
d
i
r
e
c
t
i
o
n
r
e
g
i
s
t
e
r
=
1
Port P2
6
direction
register = 1
Port P2
5
direction
register = 1
Port P2
4
direction
register = 1
P
o
r
t
P
2
3
d
i
r
e
c
t
i
o
n
r
e
g
i
s
t
e
r
=
0
Port P2
2
direction
register = 0
Port P2
1
direction
register = 0
Port P2
0
direction
register = 0
PULL register A
Bit 4 = 1
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