R8C/10 Group
Rev.1.20 Jan 27, 2006 page 50 of 180
REJ09B0019-0120
Key input interrupt
request
Pull-up
transistor
Pull-up
transistor
Pull-up
transistor
KI
3
KI
2
PU02 bit in PUR0 register
PD1_3 bit in PD1 register
KI
1
KI
0
PD1_3 bit
KI3EN bit
PD1_2 bit
KI2EN bit
PD1_1 bit
KI1EN bit
PD1_0 bit
KI0EN bit
KI3PL=1
KI3PL=0
KI2PL=1
KI2PL=0
KI1PL=1
KI1PL=0
KI0PL=1
KI0PL=0
KUPIC register
Interrupt control circuit
Pull-up
transistor
KI0EN, KI1EN, KI2EN, KI3EN,
KI0PL, KI1PL, KI2PL, KI3PL: Bits in KIEN register
PD1_0, PD1_1, PD1_2, PD1_3: Bits in PD1 register
Figure 10.15 Key Input Interrupt
10.3 Key Input Interrupt
_____ _____
A key input interrupt is generated on an input edge of any of the K10 to K13 pins. Key input interrupts can
_____
be used as a key-on wakeup function to exit wait or stop mode. KIi input can be enabled or disabled
selecting with the KIiEN (i=0 to 3) bit in the KIEN register. The edge polarity can be rising edge or falling
_____
edge selecting with the KIiPL bit in the KIEN register. Note, however, that while input on any KIi pin which
has had the KIiPL bit set to “0” (falling edge) is pulled low, inputs on all other pins of the port are not
_____
detected as interrupts. Similarly, while input on any KIi pin which has had the KIiPL bit set to “1” (rising
edge) is pulled high, inputs on all other pins of the port are not detected as interrupts.
Figure 10.15 shows a block diagram of the key input interrupt.
Figure 10.16 KIEN Register
Key input enable register
Bit name Function
Bit symbol
R
W
S
y
m
b
o
lA
d
d
r
e
s
sA
f
t
e
r
r
e
s
e
t
K
I
E
N
0
0
9
8
1
6
0
0
1
6
K
I
0
E
N
b
7b
6b5b
4b
3b
2b1b
0
KI0 input enable bit 0 : Disabled
1 : Enabled
0 : Falling edge
1 : Rising edges
0 : Disabled
1 : Enabled
0 : Falling edge
1 : Rising edges
0 : Disabled
1 : Enabled
KI0 input polarity select bit
KI1 input enable bit
KI1 input polarity select bit
KI2 input enable bit
KI2 input polarity select bit 0 : Falling edge
1 : Rising edges
K
I
0
P
L
K
I
1
E
N
K
I
1
P
L
K
I
2
E
N
K
I
2
P
L
KI3 input enable bit 0 : Disabled
1 : Enabled
K
I
3
E
N
KI3 input polarity select bit 0 : Falling edge
1 : Rising edges
K
I
3
P
L
R
W
R
W
R
W
R
W
R
W
RW
RW
R
W
N
O
T
E
S
:
1
.
T
h
e
I
R
b
i
t
i
n
t
h
e
K
U
P
I
C
r
e
g
i
s
t
e
r
m
a
y
b
e
s
e
t
t
o
“
1
”
(
i
n
t
e
r
r
u
p
t
r
e
q
u
e
s
t
e
d
)
w
h
e
n
t
h
e
K
I
E
N
r
e
g
i
s
t
e
r
i
s
r
e
w
r
i
t
t
e
n
.
R
e
f
e
r
t
o
t
h
e
p
a
r
a
g
r
a
p
h
1
9
.
2
.
5
“
C
h
a
n
g
i
n
g
I
n
t
e
r
r
u
p
t
F
a
c
t
o
r
”
i
n
t
h
e
U
s
a
g
e
N
o
t
e
s
R
e
f
e
r
e
n
c
e
B
o
o
k
.
10.3 Key Input Interrupt
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