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CHAPTER 3 CPU
3.4.3
Flag change inhibit prefix (NCC)
When the flag change inhibit prefix (NCC) code precedes an instruction for changing
various flags of the condition code register (CCR), a flag change caused by instruction
execution can be inhibited.
■
Flag change inhibit prefix (NCC)
The flag change inhibit prefix (NCC) code is used to inhibit an unnecessary flag change.
When the flag change inhibit prefix (NCC) code precedes an instruction for changing various flags of the
condition code register (CCR), a flag change caused by instruction execution can be inhibited.
•
Sticky-bit flag (CCR: T)
•
Negative flag (CCR: N)
•
Zero flag (CCR: Z)
•
Overflow flag (CCR: V)
•
Carry flag (CCR: C)
Table 3.4-5 shows the instructions requiring precaution when using the flag change inhibit prefix.
Table 3.4-5 Instructions Requiring Precaution When Using Flag Change Inhibit Prefix (NCC)
Instruction Types
Instruction
Description
String instruction
MOVS
SCEQ
FILS
MOVSW
SCWEQ
FILSW
Do not the add the NCC code to the string instruction.
Flag change instruction
AND CCR,#imm8
OR CCR,#imm8
The CCR changes by execution of an instruction, regardless of the
presence or absence of the NCC code.
The flag change inhibit prefix code affects the next instruction.
PS Return instruction
POPW PS
The CCR changes by execution of an instruction, regardless of the
presence or absence of the NCC code.
The flag change inhibit prefix code affects the next instruction.
ILM setting instruction
MOV ILM,#imm8
The flag change inhibit prefix code affects up to the next instruction.
Interrupt instruction
Interrupt return instruction
INT #vct8
INT addr16
RETI
INT9
INTP addr24
The CCR changes by execution of an instruction, regardless of the
presence or absence of the NCC code.
Context switch instruction
JCTX @A
The CCR changes by execution of an instruction, regardless of the
presence or absence of the NCC code.
Содержание F2MC-16LX Series
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Страница 3: ...FUJITSU LIMITED F2MC 16LX 16 bit Microcontroller MB90895 series Hardware Manual ...
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Страница 676: ...658 APPENDIX Table A 9 3 Bit Operation Instruction Map first byte 6CH ...
Страница 677: ...659 APPENDIX A Instructions Table A 9 4 Character String Operation Instruction Map first byte 6EH ...
Страница 678: ...660 APPENDIX Table A 9 5 2 byte Instruction Map first byte 6FH MUL MULW DIVU A A A ...
Страница 680: ...662 APPENDIX Table A 9 7 ea Instruction 2 first byte 71H ...
Страница 681: ...663 APPENDIX A Instructions Table A 9 8 ea Instruction 3 first byte 72H ...
Страница 682: ...664 APPENDIX Table A 9 9 ea Instruction 4 first byte 73H ...
Страница 683: ...665 APPENDIX A Instructions Table A 9 10 ea Instruction 5 first byte 74H ...
Страница 684: ...666 APPENDIX Table A 9 11 ea Instruction 6 first byte 75H ...
Страница 685: ...667 APPENDIX A Instructions Table A 9 12 ea Instruction 7 first byte 76H ...
Страница 686: ...668 APPENDIX Table A 9 13 ea Instruction 8 first byte 77H ...
Страница 687: ...669 APPENDIX A Instructions Table A 9 14 ea Instruction 9 first byte 78H ...
Страница 688: ...670 APPENDIX Table A 9 15 MOVEA RWi ea Instruction first byte 79H ...
Страница 689: ...671 APPENDIX A Instructions Table A 9 16 MOV Ri ea Instruction first byte 7AH ...
Страница 690: ...672 APPENDIX Table A 9 17 MOVW RWi ea Instruction first byte 7BH ...
Страница 691: ...673 APPENDIX A Instructions Table A 9 18 MOV ea Ri Instruction first byte 7CH ...
Страница 692: ...674 APPENDIX Table A 9 19 MOVW ea Rwi Instruction first byte 7DH ...
Страница 693: ...675 APPENDIX A Instructions Table A 9 20 XCH Ri ea Instruction first byte 7EH ...
Страница 694: ...676 APPENDIX Table A 9 21 XCHW RWi ea Instruction first byte 7FH ...
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