SH7280 Datasheet, PDF (194/1726 Pages) Renesas Technology Corp – Renesas 32-Bit RISC Microcomputer SuperHTM RISC engine family

Section 6 Interrupt Controller (INTC)
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.
Rev. 1.00 Jun. 26, 2008 Page 164 of 1692
REJ09B0393-0100