HD64F2168 Datasheet, PDF (91/874 Pages) Renesas Technology Corp – Renesas 16-Bit Single-Chip Microcomputer

2.9 Usage Notes
2.9.1 Note on TAS Instruction Usage
The TAS instruction is not generated by the Renesas H8S and H8/300 series C/C++ compilers.
The TAS instruction can be used as a user-defined intrinsic function.
2.9.2 Note on Bit Manipulation Instructions
The BSET, BCLR, BNOT, BST, and BIST instructions read data in byte units, manipulate the
data of the target bit, and write data in byte units. Special care is required when using these
instructions in cases where a register containing a write-only bit is used or a bit is directly
manipulated for a port.
In addition, the BCLR instruction can be used to clear the flag of the internal I/O register. In this
case, if the flag to be cleared has been set to 1 by an interrupt processing routine, the flag need not
be read before executing the BCLR instruction.
Rev. 3.00, 03/04, page 51 of 830