7733 datasheet(106/940 Pages) RENESAS

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KEY INPUT INTERRUPT FUNCTION

7733 Group User’s Manual

5–3

Port P5 direction register (address D 16)

Port P6 direction register (address 10 16)

0: Must be set to “0.”

INT2

/Key input interrupt control register

Interrupt control register

P64/INT2

P57/KI3

P55/KI1

P56/KI2

P54/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 P5 pull-up

selection bit

Port P57 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

5.2 Block description

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

5.2 Block description

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 P54 to P57 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 D16 (Port P5 direction

___

When bits 4 to 7 at address B16 (Port P5 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 P5 and P6 direction registers when key input interrupt function is selected

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