7733 datasheet(837/940 Pages) RENESAS

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KEY INPUT INTERRUPT FUNCTION

7736 Group User’s Manual

5–3

5.2 Block description

Figure 5.2.1 shows the block diagram for the key input interrupt function.

5.2 Block description

INT2

/Key input interrupt control register

Interrupt control register

P64/INT2

P107/KI3

P105/KI1

P106/KI2

P104/KI0

INT2/Key input

interrupt

request

Key input interrupt selection bit

(address 7F16)

When key input interrupt is

selected, it is necessary to

select edge sense which

uses falling edge.

Pull–up

transistor

Port P10 pull-up

selection bit

Port P107 direction

Pull–up

transistor

Pull–up

transistor

Pull–up

transistor

Port P6 pull-up

selection bit 1

Port P64 direction register

Port P6 pull-up

selection bit 1

Fig. 5.2.1 Block diagram for key input interrupt function

___

____

5.2.1 Pins KI0 to KI3 and P64/INT2

When the key input interrupt function is selected, pins P104 to P107 become input pins for the key input

___

interrupt (KI0 to KI3).

When selecting the key input interrupt function, clear all of bits 4 to 7 at address 1816 (Port P10 direction

___

When bits 4 to 7 at address 1616 (Port P10 register) are read out, the status of pins KI0 to KI3 can be read

____

in. When using pin P64/INT2 as an input pin for the key input interrupt, set both of bits 5 and 7 at address

6D16 to “1” and bit 4 at address 1016 (Port P6 direction register) to “0.” When bit 4 at address E616 (Port

____

P6 register) is read out, the status of pin P64/INT2 can be read in.

Fig. 5.2.2 Port P10 and P6 direction registers when key input interrupt function is selected

Port P10 direction register (address 1816)

Port P6 direction register (address 1016)

0: Must be set to “0.”

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