Usage Note; Notes On Using The Bit Operation Instruction - Renesas H8S/2100 Series Hardware Manual

2.9

Usage Note

2.9.1

Notes on Using the Bit Operation Instruction

Instructions BSET, BCLR, BNOT, BST, and BIST read data in byte units, and write data in byte
units after bit operation. Therefore, attention must be paid when these instructions are used for
ports or registers including write-only bits.
Instruction BCLR can be used to clear the flag in the internal I/O register to 0. If it is obvious that
the flag has been set to 1 by the interrupt processing routine, it is unnecessary to read the flag
beforehand.
Rev. 1.00 Apr. 28, 2008 Page 65 of 994
REJ09B0452-0100
Section 2 CPU