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7721 Datasheet(PDF) 118 Page - Renesas Technology Corp |
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7721 Datasheet(HTML) 118 Page - Renesas Technology Corp |
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118 / 577 page  7721 Group User’s Manual INTERRUPTS 7–21 ___ 7.10 External interrupts (INTi interrupt) ___ 7.10.2 Switching of INTi interrupt request occurrence factor ___ When the INTi interrupt request occurrence factor is switched in one of the following ways, the interrupt request bit may be set to “1”: •Switching the level sense to the edge sense •Switching polarity Therefore, after this switching, make sure to clear the interrupt request bit to “0.” Figure 7.10.5 shows an ____ example of the switching procedure for the INTi interrupt request occurrence factor. Clear the level sense/edge sense select bit to “0.” ( Edge sense is selected. ) Clear the interrupt request bit to “0.” Set the polarity select bit. Clear the interrupt request bit to “0.” (2) Switching polarity (1) Switching level sense to edge sense Set the interrupt priority level to one of levels 1–7 or clear the interrupt disable flag (I) to “0.” (INTi interrupt request is acceptable.) Set the interrupt priority level to level 0 or set the interrupt disable flag (I) to “1.” (INTi interrupt is disabled. ) Note: The above settings must be done separately. Multiple settings must not be done at the same time, in other words, they must not be done only by 1 instruction. Set the interrupt priority level to level 0 or set the interrupt disable flag (I) to “1.” (INTi interrupt is disabled. ) Set the interrupt priority level to one of levels 1–7 or clear the interrupt disable flag (I) to “0.” (INTi interrupt request is acceptable.) ___ Fig. 7.10.5 Example of switching procedure for INTi interrupt request occurrence factor |
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