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Renesas PROM Programming Adapters PCA7438F-64A Especificaciones Pagina 20

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Rev.2.40 Jun 14, 2004 page 20 of 56
38C1 Group
Key Input Interrupt (Key-on Wake Up)
A Key-on wake up interrupt request is generated by applying “L”
level voltage to any pin of port P3 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 17, where an interrupt request is generated by
pressing one of the keys consisted as an active-low key matrix
which inputs to ports P30–P33.
Fig. 17 Connection example when using key input control register, key input interrupt and port P3 block diagram
P
o
r
t
P
3
0
l
a
t
c
h
Port P3
0
direction register = “0”
Port P3
1
latch
Port P3
1
direction register = “0”
Port P3
2
latch
Port P3
2
direction register = “0”
P
o
r
t
P
3
3
l
a
t
c
h
Port P3
3
direction register = “0”
P
o
r
t
P
3
4
l
a
t
c
h
Port P3
4
direction register = “1”
P
3
0
i
n
p
u
t
P3
1
input
P
3
2
i
n
p
u
t
P
3
3
i
n
p
u
t
P
3
4
o
u
t
p
u
t
PULL register
Bit 3 = “1”
Port P3
input read circuit
Port PXx
“L” level output
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-channel transistor for pull-up
CMOS output buffer
✽ ✽✽
✽ ✽✽
✽ ✽✽
✽ ✽✽
✽ ✽✽
✽ ✽
✽
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