8051 Instructions and Examples

8051 Instruction Set with Examples

Instruction		Example
Mnemonic	Operands
NOP		NOP
AJMP	code addr (addr11)	AJMP JMPADR
LJMP	code addr (addr16)	LJMP JMPADR
RR	A	RR A
INC	A	INC A
INC	data addr (direct)	INC 34h
INC	@R0	INC @R0
INC	@R1	INC @R1
INC	R0	INC R0
INC	R1	INC R1
INC	R2	INC R2
INC	R3	INC R3
INC	R4	INC R4
INC	R5	INC R5
INC	R6	INC R6
INC	R7	INC R7
JBC	bit addr, code addr (rel)	JBC ACC.3,LABEL1
ACALL	code addr (addr11)	ACALL SUBRTN
LCALL	code addr (addr16)	LCALL SUBRTN
RRC	A	RRC A
DEC	A	DEC A
DEC	data addr (direct)	DEC 35h
DEC	@R0	DEC @R0
DEC	@R1	DEC @R1
DEC	R0	DEC R0
DEC	R1	DEC R1
DEC	R2	DEC R2
DEC	R3	DEC R3
DEC	R4	DEC R4
DEC	R5	DEC R5
DEC	R6	DEC R6
DEC	R7	DEC R7
JB	bit addr, code addr (rel)	JB P1.2,LABEL1
AJMP	code addr (addr11)	AJMP JMPADR
RET		RET
RL	A	RL A
ADD	A, #data (immediate)	ADD A, #03h
ADD	A,data addr (direct)	ADD A, 20h
ADD	A,@R0	ADD A, @R0
ADD	A,@R1	ADD A, @R1
ADD	A,R0	ADD A, R0
ADD	A,R1	ADD A, R1
ADD	A,R2	ADD A, R2
ADD	A,R3	ADD A, R3
ADD	A,R4	ADD A, R4
ADD	A,R5	ADD A, R5
ADD	A,R6	ADD A, R6
ADD	A,R7	ADD A, R7
JNB	bit addr, code addr (rel)	JNB P1.3,LABEL1
ACALL	code addr (addr11)	ACALL SUBRTN
RETI		RETI
RLC	A	RLC A
ADDC	A, #data (immediate)	ADDC A, #03h
ADDC	A,data addr (direct)	ADDC A, 20h
ADDC	A,@R0	ADDC A, @R0
ADDC	A,@R1	ADDC A, @R1
ADDC	A,R0	ADDC A, R0
ADDC	A,R1	ADDC A, R1
ADDC	A,R2	ADDC A, R2
ADDC	A,R3	ADDC A, R3
ADDC	A,R4	ADDC A, R4
ADDC	A,R5	ADDC A, R5
ADDC	A,R6	ADDC A, R6
ADDC	A,R7	ADDC A, R7
JC	code addr (rel)	JC LABEL1
AJMP	code addr (addr11)	AJMP JMPADR
ORL	data addr (direct),A	ORL P0, A
ORL	data addr (direct), #data (immediate)	ORL P0, #01h
ORL	A, #data (immediate)	ORL A, #01h
ORL	A,data addr (direct)	ORL A, P0
ORL	A,@R0	ORL A, @R0
ORL	A,@R1	ORL A, @R1
ORL	A,R0	ORL A, R0
ORL	A,R1	ORL A, R1
ORL	A,R2	ORL A, R2
ORL	A,R3	ORL A, R3
ORL	A,R4	ORL A, R4
ORL	A,R5	ORL A, R5
ORL	A,R6	ORL A, R6
ORL	A,R7	ORL A, R7
JNC	code addr (rel)	JNC LABEL1
ACALL	code addr (addr11)	ACALL SUBRTN
ANL	data addr (direct),A	ANL 40h, A
ANL	data addr(direct), #data(immediate)	ANL 30h, #77h
ANL	A, #data (immediate)	ANL A, #3Fh
ANL	A,data addr (direct)	ANL A, 40h
ANL	A,@R0	ANL A, @R0
ANL	A,@R1	ANL A, @R1
ANL	A,R0	ANL A, R0
ANL	A,R1	ANL A, R1
ANL	A,R2	ANL A, R2
ANL	A,R3	ANL A, R3
ANL	A,R4	ANL A, R4
ANL	A,R5	ANL A, R5
ANL	A,R6	ANL A, R6
ANL	A,R7	ANL A, R7
JZ	code addr (rel)	JZ LABEL1
AJMP	code addr (addr11)	AJMP JMPADR
XRL	data addr (direct),A	XRL 34h, A
XRL	data addr (direct), #data (immediate)	XRL 34h, #0FFh
XRL	A, #data (immediate)	XRL A, #0FFh
XRL	A,data addr (direct)	XRL A, 34h
XRL	A,@R0	XRL A, @R0
XRL	A,@R1	XRL A, @R1
XRL	A,R0	XRL A, R0
XRL	A,R1	XRL A, R1
XRL	A,R2	XRL A, R2
XRL	A,R3	XRL A, R3
XRL	A,R4	XRL A, R4
XRL	A,R5	XRL A, R5
XRL	A,R6	XRL A, R6
XRL	A,R7	XRL A, R7
JNZ	code addr (rel)	JNZ LABEL1
ACALL	code addr (addr11)	ACALL SUBRTN
ORL	C,bit addr	ORL C, 22h
JMP	@A+DPTR	JMP @A + DPTR
MOV	A,#data (immediate)	MOV A, #0FFh
MOV	data addr(direct), #data (immediate)	MOV P2, #0FFh
MOV	@R0, #data (immediate)	MOV @R0, #10h
MOV	@R1, #data (immediate)	MOV @R1, #10h
MOV	R0, #data (immediate)	MOV R0, #10h
MOV	R1, #data (immediate)	MOV R1, #10h
MOV	R2, #data (immediate)	MOV R2, #10h
MOV	R3, #data (immediate)	MOV R3, #10h
MOV	R4, #data (immediate)	MOV R4, #10h
MOV	R5, #data (immediate)	MOV R5, #10h
MOV	R6, #data (immediate)	MOV R6, #10h
MOV	R7, #data (immediate)	MOV R7, #10h
SJMP	code addr (rel)	SJMP RELADR
AJMP	code addr (addr11)	AJMP JMPADR
ANL	C,bit addr	ANL C, 22h
MOVC	A,@A+PC	MOV A, @A+PC
DIV	AB	DIV AB
MOV	data addr (direct), data addr (direct)	MOV P1, P0
MOV	data addr (direct),@R0	MOV P0, @R0
MOV	data addr (direct),@R1	MOV P0, @R1
MOV	data addr (direct),R0	MOV P2, R0
MOV	data addr (direct),R1	MOV P2, R1
MOV	data addr (direct),R2	MOV P2, R2
MOV	data addr (direct),R3	MOV P2, R3
MOV	data addr (direct),R4	MOV P2, R4
MOV	data addr (direct),R5	MOV P2, R5
MOV	data addr (direct),R6	MOV P2, R6
MOV	data addr (direct),R7	MOV P2, R7
MOV	DPTR, #data16 (immediate)	MOV DPTR, # 1234H
ACALL	code addr (addr11)	ACALL SUBRTN
MOV	bit addr,C	MOV 22h, C
MOVC	A,@A+DPTR	MOVC A, @A+DPTR
SUBB	A,#data (immediate)	SUBB A, #01h
SUBB	A,data addr (direct)	SUBB A, 44h
SUBB	A,@R0	SUBB A, @R0
SUBB	A,@R1	SUBB A, @R1
SUBB	A,R0	SUBB A, R0
SUBB	A,R1	SUBB A, R1
SUBB	A,R2	SUBB A, R2
SUBB	A,R3	SUBB A, R3
SUBB	A,R4	SUBB A, R4
SUBB	A,R5	SUBB A, R5
SUBB	A,R6	SUBB A, R6
SUBB	A,R7	SUBB A, R7
ORL	C,/bit addr	ORL C, /22h
AJMP	code addr (addr11)	AJMP JMPADR
MOV	C,bit addr	MOV C, 22h
INC	DPTR	INC DPTR
MUL	AB	MUL AB
reserved
MOV	@R0,data addr (direct)	MOV @R0, P2
MOV	@R1,data addr (direct)	MOV @R1, P2
MOV	R0,data addr (direct)	MOV R0, P1
MOV	R1,data addr (direct)	MOV R1, P1
MOV	R2,data addr (direct)	MOV R2, P1
MOV	R3,data addr (direct)	MOV R3, P1
MOV	R4,data addr (direct)	MOV R4, P1
MOV	R5,data addr (direct)	MOV R5, P1
MOV	R6,data addr (direct)	MOV R6, P1
MOV	R7,data addr (direct)	MOV R7, P1
ANL	C,/bit addr	ANL C, /22h
ACALL	code addr (addr11)	ACALL SUBRTN
CPL	bit addr	CPL P1.1
CPL	C	CPL C
CJNE	A,#data (immediate), code addr (rel)	CJNE A, #01H, LABEL
CJNE	A,data addr (direct), code addr (rel)	CJNE A, 60h, LABEL
CJNE	@R0,#data (immediate), code addr (rel)	CJNE @R0, #24H, LABEL
CJNE	@R1,#data (immediate), code addr (rel)	CJNE @R1, #24H, LABEL
CJNE	R0,#data (immediate), code addr (rel)	CJNE R0, #12H, LABEL
CJNE	R1,#data (immediate), code addr (rel)	CJNE R1, #12H, LABEL
CJNE	R2,#data (immediate), code addr (rel)	CJNE R2, #12H, LABEL
CJNE	R3,#data (immediate), code addr (rel)	CJNE R3, #12H, LABEL
CJNE	R4,#data (immediate), code addr (rel)	CJNE R4, #12H, LABEL
CJNE	R5,#data (immediate), code addr (rel)	CJNE R5, #12H, LABEL
CJNE	R6,#data (immediate), code addr (rel)	CJNE R6, #12H, LABEL
CJNE	R7,#data (immediate), code addr (rel)	CJNE R7, #12H, LABEL
PUSH	data addr (direct)	PUSH DPL
AJMP	code addr (addr11)	AJMP JMPADR
CLR	bit addr	CLR P1.2
CLR	C	CLR C
SWAP	A	SWAP A
XCH	A,data addr (direct)	XCH A, 45h
XCH	A,@R0	XCH A, @R0
XCH	A,@R1	XCH A, @R1
XCH	A,R0	XCH A, R0
XCH	A,R1	XCH A, R1
XCH	A,R2	XCH A, R2
XCH	A,R3	XCH A, R3
XCH	A,R4	XCH A, R4
XCH	A,R5	XCH A, R5
XCH	A,R6	XCH A, R6
XCH	A,R7	XCH A, R7
POP	data addr (direct)	POP 34h
ACALL	code addr (addr11)	ACALL SUBRTN
SETB	bit addr	SETB 63h
SETB	C	SETB C
DA	A	DA A
DJNZ	data addr (direct), code addr (rel)	DJNZ 40h, LABEL
XCHD	A,@R0	XCHD A,@R0
XCHD	A,@R1	XCHD A,@R1
DJNZ	R0,code addr (rel)	DJNZ R0, LABEL
DJNZ	R1,code addr (rel)	DJNZ R1, LABEL
DJNZ	R2,code addr (rel)	DJNZ R2, LABEL
DJNZ	R3,code addr (rel)	DJNZ R3, LABEL
DJNZ	R4,code addr (rel)	DJNZ R4, LABEL
DJNZ	R5,code addr (rel)	DJNZ R5, LABEL
DJNZ	R6,code addr (rel)	DJNZ R6, LABEL
DJNZ	R7,code addr (rel)	DJNZ R7, LABEL
MOVX	A,@DPTR	MOVX A, @DPTR
AJMP	code addr (addr11)	AJMP JMPADR
MOVX	A,@R0	MOVX A, @R0
MOVX	A,@R1	MOVX A, @R1
CLR	A	CLR A
MOV	A,data addr (direct)	MOV A, P0
MOV	A,@R0	MOV A, @R0
MOV	A,@R1	MOV A, @R1
MOV	A,R0	MOV A, R0
MOV	A,R1	MOV A, R1
MOV	A,R2	MOV A, R2
MOV	A,R3	MOV A, R3
MOV	A,R4	MOV A, R4
MOV	A,R5	MOV A, R5
MOV	A,R6	MOV A, R6
MOV	A,R7	MOV A, R7
MOVX	@DPTR,A	MOVX @DPTR, A
ACALL	code addr (addr11)	ACALL SUBRTN
MOVX	@R0,A	MOVX @R0, A
MOVX	@R1,A	MOVX @R1, A
CPL	A	CPL A
MOV	data addr (direct),A	MOV P0, A
MOV	@R0,A	MOV @R0, A
MOV	@R1,A	MOV @R1, A
MOV	R0,A	MOV R0, A
MOV	R1,A	MOV R1, A
MOV	R2,A	MOV R2, A
MOV	R3,A	MOV R3, A
MOV	R4,A	MOV R4, A
MOV	R5,A	MOV R5, A
MOV	R6,A	MOV R6, A
MOV	R7,A	MOV R7, A

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Related topics:
8051 Instruction Set Overview   |   8051 Instruction Cycle   |   8051 Machine Cycle   |   8051 Instruction Set Summary   |   8051 Arithmetic Operation Instructions   |   8051 Logical Operation Instructions   |   8051 Data Transfer Instructions   |   8051 Boolean Variable Manipulation Instructions   |   8051 Program Branching Instructions   |   8051 Instruction Opcode   |   8051 Instructions that Affect Flag Settings

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