7751 datasheet(80/540 Pages) RENESAS

80 / 540 page

7751 Group User’s Manual

INTERRUPTS

4–25

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4.10 External interrupts (INTi interrupt)

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4.10.2 Switch of occurrence factor of INTi interrupt request

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To switch the occurrence factor of INTi interrupt request from the level sense to the edge sense, set the

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INTi interrupt control register in the sequence shown in Figure 4.10.5 (1). To change the polarity, set the

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INTi interrupt control register in the sequence shown in Figure 4.10.5 (2).

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Fig. 4.10.5 Switching flow of occurrence factor of INTi interrupt request

Clear level sense/edge sense select bit to “0”

( Select edge sense )

Clear interrupt request bit to “0”

Set the interrupt priority level to level 0

( Disable INTi interrupt )

Set polarity select bit

Clear interrupt request bit to “0”

(2) Changing polarity

(1) Switching from level sense to edge sense

Set the interrupt priority level to level 1–7

(Enable acceptance of INTi interrupt request)

Set the interrupt priority level to level 1–7

(Enable acceptance of INTi interrupt request)

Set the interrupt priority level to level 0

( Disable INTi interrupt )

Note: Follow the above procedure each. Do not perform 2 or more setting at the same

time, with 1 instruction.

7751 Datasheet(PDF) 80 Page - Renesas Technology Corp