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SH7243 Datasheet(PDF) 194 Page - Renesas Technology Corp |
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SH7243 Datasheet(HTML) 194 Page - Renesas Technology Corp |
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194 / 1726 page  Section 6 Interrupt Controller (INTC) Rev. 1.00 Jun. 26, 2008 Page 164 of 1692 REJ09B0393-0100 6.10 Usage Note 6.10.1 Timing to Clear an Interrupt Source The interrupt source flags should be cleared in the interrupt exception service routine. After clearing the interrupt source flag, "time from occurrence of interrupt request until interrupt controller identifies priority, compares it with mask bits in SR, and sends interrupt request signal to CPU" shown in table 6.5 is required before the interrupt source sent to the CPU is actually cancelled. To ensure that an interrupt request that should have been cleared is not inadvertently accepted again, read the interrupt source flag after it has been cleared, and then execute an RTE instruction. |
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