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SH7672 Datasheet(PDF) 194 Page - Renesas Technology Corp |
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SH7672 Datasheet(HTML) 194 Page - Renesas Technology Corp |
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194 / 1292 page  Section 6 Interrupt Controller (INTC) Rev. 1.00 Nov. 14, 2007 Page 168 of 1262 REJ09B0437-0100 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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