Instruction Set Summary
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Table 2-3. Instruction Set Summary (continued)
Mnemonic Description Hex Opcode Bytes Cycles
JNZ rel Jump if accumulator is not zero 70 2 3
JC rel Jump if carry flag is set 40 2 3
JNC Jump if carry flag is not set 50 2 3
JB bit,rel Jump if direct bit is set 20 3 4
JNB bit,rel Jump if direct bit is not set 30 3 4
JBC bit,direct rel Jump if direct bit is set and clear bit 10 3 4
CJNE A,direct rel Compare direct byte to A and jump if not equal B5 3 4
CJNE A,#data rel Compare immediate to A and jump if not equal B4 3 4
CJNE Rn,#data rel Compare immediate to reg. and jump if not equal B8–BF 3 4
CJNE @Ri,#data rel Compare immediate to indirect and jump if not equal B6–B7 3 4
DJNZ Rn,rel Decrement register and jump if not zero D8–DF 1 3
DJNZ direct,rel Decrement direct byte and jump if not zero D5 3 4
NOP No operation 00 1 1
Boolean VARIABLE OPERATIONS
CLR C Clear carry flag C3 1 1
CLR bit Clear direct bit C2 2 3
SETB C Set carry flag D3 1 1
SETB bit Set direct bit D2 2 3
CPL C Complement carry flag B3 1 1
CPL bit Complement direct bit B2 2 3
ANL C,bit AND direct bit to carry flag 82 2 2
ANL C,/bit AND complement of direct bit to carry B0 2 2
ORL C,bit OR direct bit to carry flag 72 2 2
ORL C,/bit OR complement of direct bit to carry A0 2 2
MOV C,bit Move direct bit to carry flag A2 2 2
MOV bit,C Move carry flag to direct bit 92 2 3
42
8051 CPU SWRU191C–April 2009–Revised January 2012
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