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CHAPTER 3 CPU
3.9.3
Flag Change Suppression Prefix (NCC)
The flag change suppression prefix (NCC) code is placed before an instruction to
suppress a flag change accompanying the execution of the instruction.
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Flag Change Suppression Prefix (NCC)
The flag change suppression prefix (NCC) is used to suppress unnecessary flag changes. If a flag change
suppression prefix code is placed before an instruction, a flag change accompanying the execution of the
instruction is suppressed. Changes of the T, N, Z, V and C flags are suppressed.
Note that caution is required when this prefix is used with the instructions listed in Table 3.9-5.
Table 3.9-5 Instructions whose use requires Caution when the Flag Change Suppression Prefix (NCC) is
used
Instruction type
Instruction
Explanation
String
instruction
MOVS MOVSW
SCEQ SCWEQ
FILS FILSW
Do not place the NCC prefix before the string instruction.
Flag change
instruction
AND CCR, #imm8 OR CCR, #imm8
The condition code register (CCR) changes as defined in
the instruction specification whether or not a prefix is used.
The effect of prefix extends to the next instruction.
PS return
instruction
POPW PS
The condition code register (CCR) changes as defined in
the instruction specification whether or not a prefix is used.
The effect of prefix extends to the next instruction.
ILM setting
instruction
MOV ILM, #imm8
The effect of prefix extends to the next instruction.
Interrupt instruction
Interrupt return
instruction
INT #vct8 INT9
INT adder16 INTP addr24
RETI
The condition code register (CCR) changes as defined in
the instruction specification whether or not a prefix is used.
Context switch
instruction
JCTX@A
The condition code register (CCR) changes as defined in
the instruction specification whether or not a prefix is used.
Summary of Contents for MB90460 Series
Page 1: ...The following document contains information on Cypress products ...
Page 3: ......
Page 5: ......
Page 9: ...iv ...
Page 41: ...22 CHAPTER 1 OVERVIEW ...
Page 45: ...26 CHAPTER 2 NOTES ON HANDLING DEVICES ...
Page 83: ...64 CHAPTER 3 CPU ...
Page 95: ...76 CHAPTER 4 RESET ...
Page 107: ...88 CHAPTER 5 CLOCK ...
Page 131: ...112 CHAPTER 6 LOW POWER CONSUMPTION MODE ...
Page 175: ...156 CHAPTER 7 INTERRUPT ...
Page 181: ...162 CHAPTER 8 MODE SETTING ...
Page 223: ...204 CHAPTER 9 I O PORT ...
Page 237: ...218 CHAPTER 10 TIME BASE TIMER ...
Page 247: ...228 CHAPTER 11 WATCHDOG TIMER ...
Page 275: ...256 CHAPTER 12 16 BIT RELOAD TIMER ...
Page 373: ...354 CHAPTER 14 MULTI FUNCTIONAL TIMER ...
Page 485: ...466 CHAPTER 16 PWC Timer ...
Page 531: ...512 CHAPTER 17 UART ...
Page 559: ...540 CHAPTER 19 DELAYED INTERRUPT GENERATOR MODULE ...
Page 589: ...570 CHAPTER 20 8 10 BIT A D CONVERTER ...
Page 601: ...582 CHAPTER 21 ROM CORRECTION FUNCTION ...
Page 633: ...614 CHAPTER 23 512K 1024K BIT FLASH MEMORY ...
Page 645: ...626 CHAPTER 24 EXAMPLE OF F2 MC 16LX MB90F462 F462A F463A CONNECTION FOR SERIAL WRITING ...
Page 715: ...696 APPENDIX ...
Page 716: ...697 INDEX INDEX The index follows on the next page This is listed in alphabetic order ...
Page 739: ......