Instruction Set Summary

Data Transfer Instructions

Instruction	Description	Byte	Cycle
MOV A, Rn	Move register to accumulator	1	1
MOV A, direct	Move direct byte to accumulator	2	1
MOV A, @Ri	Move indirect RAM to accumulator	1	1
MOV A, #data	Move immediate data to accumulator	2	1
MOV Rn, A	Move accumulator to register	1	1
MOV Rn, direct	Move direct byte to register	2	2
MOV Rn, #data	Move immediate data to register	2	1
MOV direct, A	Move accumulator to direct byte	2	1
MOV direct, Rn	Move register to direct byte	2	2
MOV direct, direct	Move direct byte to direct byte	3	2
MOV direct, @Ri	Move indirect RAM to direct byte	2	2
MOV direct, #data	Move immediate data to direct byte	3	2
MOV @Ri, A	Move accumulator to indirect RAM	1	1
MOV @Ri, direct	Move direct byte to indirect RAM	2	2
MOV @Ri, #data	Move immediate data to indirect RAM	2	1
MOV DPTR, #data16	Load data pointer with a 16-bit constant	3	2
MOVC A, @A+DPTR	Move code byte relative to DPTR to accumulator	1	2
MOVC A, @A+PC	Move code byte relative to PC to accumulator	1	2
MOVX A, @Ri	Move external RAM (8-bit addr.) to A	1	2
MOVX A, @DPTR	Move external RAM (16-bit addr.) to A	1	2
MOVX @Ri, A	Move A to external RAM (8-bit addr.)	1	2
MOVX @DPTR, A	Move A to external RAM (16-bit addr.)	1	2
PUSH direct	Push direct byte onto stack	2	2
POP direct	Pop direct byte from stack	2	2
XCH A, Rn	Exchange register with accumulator	1	1
XCH A, direct	Exchange direct byte with accumulator	2	1
XCH A, @Ri	Exchange indirect RAM with accumulator	1	1
XCHD A, @Ri	Exchange low-order nibble indir. RAM with A	1	1

Boolean Instructions

Instruction	Description	Byte	Cycle
CLR C	Clear carry flag	1	1
CLR bit	Clear direct bit	2	1
SETB C	Set carry flag	1	1
SETB bit	Set direct bit	2	1
CPL C	Complement carry flag	1	1
CPL bit	Complement direct bit	2	1
ANL C, bit	AND direct bit to carry flag	2	2
ANL C, /bit	AND complement of direct bit to carry	2	2
ORL C, bit	OR direct bit to carry flag	2	2
ORL C, /bit	OR complement of direct bit to carry	2	2
MOV C, bit	Move direct bit to carry flag	2	1
MOV bit, C	Move carry flag to direct bit	2	2

Program Control Instructions

Instruction	Description	Byte	Cycle
ACALL addr11	Absolute 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 iump	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, rel	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 immed. to reg. and jump if not equal	3	2
CJNE @Ri, #data, rel	Compare immed. 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

Instruction Set Summary

Arithmetic Instructions

Instruction	Description	Byte	Cycle
ADD A, Rn	Add register to accumulator	1	1
ADD A, direct	Add direct byte to accumulator	1	1
ADD A, @Ri	Add indirect RAM to accumulator	1	1
ADD A, #data	Add immediate data to accumulator	2	1
ADDC A, Rn	Add register to accumulator with carry flag	1	1
ADDC A, direct	Add direct byte to A with carry flag	2	1
ADDC A, @Ri	Add indirect RAM to A with carry flag	1	1
ADDC A, #data	Add immediate data to A with carry flag	2	1
SUBB A, Rn	Subtract register from A with borrow	1	1
SUBB A, direct	Subtract direct byte from A with borrow	2	1
SUBB A, @Ri	Subtract indirect RAM from A with borrow	1	1
SUBB A, #data	Subtract immediate data from A with borrow	2	1
INC A	Increment accumulator	1	1
INC Rn	Increment register	1	1
INC direct	Increment direct byte	2	1
INC @Ri	Increment indirect RAM	1	1
DEC A	Decrement accumulator	1	1
DEC Rn	Decrement register	1	1
DEC direct	Decrement direct byte	2	1
DEC @Ri	Decrement indirect RAM	1	1
INC DPTR	Increment data pointer	1	2
MUL AB	Multiply A and B	1	4
DIV AB	Divide A by B	1	4
DA A	Decimal adjust accumulator	1	1

Logical Instructions

Instruction	Description	Byte	Cycle
ANL A, Rn	AND register to accumulator	1	1
ANL A, direct	AND direct byte to accumulator	2	1
ANL A, @Ri	AND indirect RAM to accumulator	1	1
ANL A, #data	AND immediate data to accumulator	2	1
ANL direct, A	AND accumulator to direct byte	2	1
ANL direct, #data	AND immediate data to direct byte	3	2
ORL A, Rn	OR register to accumulator	1	1
ORL A, direct	OR direct byte to accumulator	2	1
ORL A, @Ri	OR indirect RAM to accumulator	1	1
ORL A, #data	OR immediate data to accumulator	2	1
ORL direct, A	OR accumulator to direct byte	2	1
ORL direct, #data	OR immediate data to direct byte	3	2
XRL A, Rn	Exclusive OR register to accumulator	1	1
XRL A direct	Exclusive OR direct byte to accumulator	2	1
XRL A, @Ri	Exclusive OR indirect RAM to accumulator	1	1
XRL A, #data	Exclusive OR immediate data to accumulator	2	1
XRL direct, A	Exclusive OR accumulator to direct byte	2	1
XRL direct, #data	Exclusive OR immediate data to direct byte	3	2
CLR A	Clear accumulator	1	1
CPL A	Complement accumulator	1	1
RL A	Rotate accumulator left	1	1
RLC A	Rotate accumulator left through carry	1	1
RR A	Rotate accumulator right	1	1
RRC A	Rotate accumulator right through carry	1	1
SWAP A	Swap nibbles within the accumulator	1	1

Contd...