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Instruction set of program and machine control for 8051

Posted By: Gabriel Brown     Category: Assembly Language     Views: 6363

An article for instruction set of program and machine control for 8051.

Instruction set of program and machine control for 8051 

Mnemonic Description Byte Cycle
ACALL addr11 Ansolute subroutine call 2 2
LCALL addr16 Long subroutine call 3 2
RET Return from subroutine 1 2
RETI Return from interrupt 1 2
AJMP addr11 Absolute jump 2 2
LJMP addr16 Long jump 3 2
SJMP rel Short jump (relative addr.) 2 2
JMP @A + DPTR Jump indirect relative to the DPTR 1 2
JZ rel Jump if accumulator is zero 2 2
JNZ rel Jump if accumulator is not zero 2 2
JC rel Jump if carry flag is set 2 2
JNC rel Jump if carry flag is not set 2 2
JB bit,rel Jump if direct bit is set 3 2
JNB bit, Jump if direct bit is not set 3 2
JBC bit,rel Jump if direct bit is set and clear bit 3 2
CJNE A,direct,rel Compare direct byte to A and jump if not equal 3 2
CJNE A,#data,rel Compare immediate to A and jump if not equal 3 2
CJNE Rn,#data rel Compare immediate to reg. and jump if not equal 3 2
CJNE @Ri,#data,rel Compare immediate to ind. and jump if not equal 3 2
DJNZ Rn,rel Decrement register and jump if not zero 2 2
DJNZ direct,rel Decrement direct byte and jump if not zero 3 2
NOP No operation 1 1
  
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Gabriel Brown
Gabriel Brown author of Instruction set of program and machine control for 8051 is from London, United Kingdom.
 
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