R8CSLASH2G datasheet(145/344 Pages) RENESAS

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R8C/2G Group

13. Interrupts

Rev.1.00

Apr 04, 2008

Page 125 of 318

REJ09B0387-0100

13.3

Key Input Interrupt

A key input interrupt request is generated by one of the input edges of the K10 to K13 pins. Table 13.7 lists the Pin

Configuration of Key Input Interrupt. The key input interrupt can be used as a key-on wake-up function to exit wait

or stop mode.

The KIiEN (i = 0 to 3) bit in the KIEN register can select whether the pins are used as KIi input. The KIiPL bit in

the KIEN register can select the input polarity.

When inputting “L” to the KIi pin which sets the KIiPL bit to 0 (falling edge), the input of the other pins K10 to

K13 is not detected as interrupts. Also, when inputting “H” to the KIi pin, which sets the KIiPL bit to 1 (rising

edge), the input of the other pins K10 to K13 is not detected as interrupts.

Figure 13.17 shows a Block Diagram of Key Input Interrupt and Figure 13.18 shows the KIEN Register.

NOTES:

1. The KI0 pin is selected by the KI0SEL bit in the PINSR4 register. Refer to 8. I/O Ports for details.

2. The KI1 pin is selected by the KI1SEL bit in the PINSR4 register. Refer to 8. I/O Ports for details.

Figure 13.17

Block Diagram of Key Input Interrupt

Table 13.7

Pin Configuration of Key Input Interrupt

Pin name

Input/Output

Function

KI0 (P0_7 or P1_0(1))

Input

KI0 input

KI1 (P1_1 or P6_6(2))

Input

KI1 input

KI2 (P1_2)

Input

KI2 input

KI3 (P1_3)

Input

KI3 input

KI3

Pull-up

transistor

KI2

Pull-up

transistor

KI3PL = 0

KI3PL = 1

PD1_3 bit

KI3EN bit

PU02 bit in PUR0 register

PD1_3 bit in PD1 register

KUPIC register

Interrupt control

circuit

Key input interrupt

request

KI2PL = 0

KI2PL = 1

PD1_2 bit

KI2EN bit

KI1

Pull-up

transistor

KI1PL = 0

KI1PL = 1

PD1_1 bit

KI1EN bit

KI0

Pull-up

transistor

KI0PL = 0

KI0PL = 1

PD1_0 bit

KI0EN bit

KI0EN, KI1EN, KI2EN, KI3EN,

KI0PL, KI1PL, KI2PL, KI3PL: Bits in KIEN register

PD1_0, PD1_1, PD1_2, PD1_3: Bits in PD1 register

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