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key input interrupt function is selected. When this bit

KEY INPUT INTERRUPT FUNCTION

7736 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

____

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

(2) Port P10 pull-up selection bit (bit 6)

___

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

___

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

= “1” and bit 5 (Port P6 pull-up selection bit )

____

= “0,” pin P6 4/INT 2 is a programmable I/O port. (At this time,

the INT2

interrupt cannot be used.) When

____

both of this bit and bit 5 (Port P6 pull-up selection bit 1) are “1,”

pin P64 / INT2 can be used for the key input interrupt.

5.2 Block description

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