Hitachi H8S/2646 Hardware Manual page 109

Hitachi 16-bit single-chip microcomputer h8s/2646 series
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The BCLR instruction can be used to clear the flag of an internal I/O register to 0. In that case, if it
is clearly known that the pertinent flag is set to 1 in an interrupt processing routine or other
processing, there is no need to read the flag in advance.
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