h8s-2111b Renesas Electronics Corporation., h8s-2111b Datasheet - Page 82
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h8s-2111b
Manufacturer Part Number
h8s-2111b
Description
Renesas 16-bit Single-chip Microcomputer H8s Family / H8s/2100 Series
Manufacturer
Renesas Electronics Corporation.
Datasheet
1.H8S-2111B.pdf
(582 pages)
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2.9
2.9.1
When using the TAS instruction, use registers ER0, ER1, ER4 and ER5.
The TAS instruction is not generated by the Renesas Technology H8S and H8/300 series C/C++
compilers. When the TAS instruction is used as a user-defined intrinsic function, use registers
ER0, ER1, ER4 and ER5.
2.9.2
ER7 is not used as the register that can be saved (STM)/restored (LDM) when using STM/LDM
instruction, because ER7 is the stack pointer. Two, three, or four registers can be saved/restored
by one STM/LDM instruction. The following ranges can be specified in the register list.
Two registers: ER0—ER1, ER2—ER3, or ER4—ER5
Three registers: ER0—ER2 or ER4—ER6
Four registers: ER0—ER3
The STM/LDM instruction including ER7 is not generated by the Renesas Technology H8S and
H8/300 series C/C++ compilers.
2.9.3
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. 1.00, 05/04, page 48 of 544
Usage Notes
Note on TAS Instruction Usage
Note on STM/LDM Instruction Usage
Note on Bit Manipulation Instructions
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