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KEY INPUT INTERRUPT FUNCTION

7733 Group User’s Manual

5–5

(1) Port P6 pull-up selection bit (bit 5)

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When using pin P64/INT2 as an input pin for the key input interrupt, set this bit to “1.” When this bit

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is set to “1,” pin P64/INT2 is pulled high.

(2) Port P5 pull-up selection bit (bit 6)

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This is a bit to pull pins KI0 to KI3 high. When configuring a key matrix, there is no need to connect

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pull-up transistors externally if this bit is set to “1,” in other words, if pins KI0 to KI3 are set to be pulled

high.

(3) Key input interrupt selection bit (bit 7)

This is a bit to select the key input interrupt function.

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The key input interrupt and the INT2 interrupt share the same interrupt vector addresses and interrupt

control register. When this bit is set to “1,” the key input interrupt function is selected. When this bit

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= “1” and bit 5 (Port P6 pull-up selection bit) = “0,” pin P64/INT2 is a programmable I/O port. (At this

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time, the INT2 interrupt cannot be used.) When both of this bit and bit 5 (Port P6 pull-up selection bit

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1) are “1,” pin P64/INT2 can be used for the key input interrupt.

5.2 Block description

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