R8C/13 Group
10.3 Key Input Interrupt
10.3 Key Input Interrupt
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A key input interrupt is generated on an input edge of any of the K10 to K13 pins. Key input interrupts can
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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
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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
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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.
PU02 bit in PUR0 register
KUPIC register
Pull-up
PD1_3 bit in PD1 register
transistor
KI3EN bit
PD1_3 bit
KI3PL=0
KI
3
2
KI3PL=1
KI2EN bit
PD1_2 bit
Pull-up
transistor
KI2PL=0
KI2PL=1
Key input interrupt
request
Interrupt control circuit
KI
KI1EN bit
PD1_1 bit
Pull-up
transistor
KI1PL=0
KI1PL=1
KI0EN, KI1EN, KI2EN, KI3EN,
KI0PL, KI1PL, KI2PL, KI3PL: Bits in KIEN register
PD1_0, PD1_1, PD1_2, PD1_3: Bits in PD1 register
KI
1
0
KI0EN bit
PD1_0 bit
Pull-up
transistor
KI0PL=0
KI0PL=1
KI
Figure 10.15 Key Input Interrupt
Key input enable register
b7 b6 b5 b4 b3 b2 b1 b0
Symbol
KIEN
Address
009816
After reset
0016
Bit symbol
RW
RW
Bit name
Function
0 : Disabled
1 : Enabled
KI0EN
KI0 input enable bit
KI0PL
KI1EN
KI1PL
KI2EN
KI2PL
KI3EN
KI3PL
KI0 input polarity select bit
KI1 input enable bit
0 : Falling edge
1 : Rising edges
RW
RW
RW
RW
RW
RW
0 : Disabled
1 : Enabled
KI1 input polarity select bit
KI2 input enable bit
0 : Falling edge
1 : Rising edges
0 : Disabled
1 : Enabled
KI2 input polarity select bit
KI3 input enable bit
0 : Falling edge
1 : Rising edges
0 : Disabled
1 : Enabled
KI3 input polarity select bit
0 : Falling edge
1 : Rising edges
RW
NOTES:
1. The IR bit in the KUPIC register may be set to “1” (interrupt requested) when the KIEN register is rewritten.
Refer to the paragraph 19.2.5 “Changing Interrupt Factor” in the Usage Notes Reference Book.
Figure 10.16 KIEN Register
Rev.1.20 Jan 27, 2006 page 65 of 205
REJ09B0111-0120
RENESAS [ RENESAS TECHNOLOGY CORP ]
