Renesas R5S72621 User Manual
Section 7 Interrupt Controller
Page 208 of 2108
R01UH0134EJ0400 Rev. 4.00
Sep
24,
2014
SH7262 Group, SH7264 Group
7.10
Usage Note
7.10.1
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 7.5 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.
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 7.5 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.
Note: * When clearing the USB 2.0 host/function module interrupt source flag, read the flag
three times after clearing it.