Hitachi H8/3048 Hardware Manual page 124

Single-chip microcomputer
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MOV.B R0L,@ISR
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Countermeasure 2
During IRQb interrupt processing, carry out IRQb Fflag clear dummy processing.
For example, if b = 1
IRQB
MOV.B #HFD,R0L
MOV.B R0L,@ISR
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