HD6413002 Datasheet, PDF (116/700 Pages) Renesas Technology Corp – High-performance single-chip microcontroller

Method 2
Perform dummy processing within the IRQb interrupt exception handling routine to clear the
IRQbF flag.
Example: When b = 1
IRQB
MOV.B #HFD, R0L
MOV.B R0L, @ISR
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101