R28 datasheet(139/473 Pages) RENESAS

139 / 473 page

R8C/28 Group, R8C/29 Group

12. Interrupts

Rev.2.10

Sep 26, 2008

Page 120 of 441

REJ09B0279-0210

12.3

Key Input Interrupt

A key input interrupt request is generated by one of the input edges of pins K10 to K13. 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 or not 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 12.16 shows a Block Diagram of Key Input Interrupt.

Figure 12.16

Block Diagram of Key Input Interrupt

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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