Renesas SH7781 - Manual (Page 311)

10. Interrupt Controller (INTC)
Rev.1.00 Jan. 10, 2008 Page 281 of 1658
REJ09B0261-0100
IRQ and IRL Interrupt Requests).
2. When the IRQnS setting is changed from edge sense (IRQnS is 00 or 01) to level
sense (IRQnS is 10 or 11), the IRQ interrupt source that has been edge sensed is
cleared. When the IRQnS setting is changed from level sense (IRQnS is 10 or 11) to
edge sense (IRQnS is 00 or 01), the IRQ interrupt source that has been sensed or held
is cleared. When the IRQnS setting is changed form falling-edge sense (IRQnS is 00) to
rising edge sense (IRQnS is 01), or changed from rising edge sense (IRQnS is 01) to
the falling edge sense (IRQnSis 00), the IRQ interrupt source that has been sensed
before changing the setting is not cleared. Likewise, when IRQnS setting is changed
from low-level sense (IRQnS is 10) to high-level sense (IRQnS is 11), or changed from
high-level sense (IRQnS is 11) to the low-level sense (IRQnSis 10), the IRQ interrupt
source that has been sensed before changing the setting is not cleared.