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7643 Datasheet(PDF) 345 Page - Renesas Technology Corp |
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7643 Datasheet(HTML) 345 Page - Renesas Technology Corp |
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345 / 424 page  7643 Group REJ09B0133-0200 APPENDIX 3.3 Notes on use Rev.2.00 Aug 28, 2006 page 22 of 98 3.3 Notes on use 3.3.1 Notes on interrupts (1) When setting external interrupt active edge When setting the external interrupt active edge (INT0, INT1), the interrupt request bit may be set to “1”. When not requiring the interrupt occurrence synchronized with these setting, take the following sequence. •Interrupt polarity select register (address 001116) Set the above listed registers or bits as the following sequence. Fig. 3.3.1 Sequence of setting external interrupt active edge Set the corresponding interrupt enable bit to “0” (disabled) . ↓ Set the interrupt edge select bit (active edge switch bit) to “1”. ↓ NOP (one or more instructions) ↓ Set the corresponding interrupt request bit to “0” (no interrupt request issued). ↓ Set the corresponding interrupt enable bit to “1” (enabled). |
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