8051 Instruction Set

Instructions by opcode

Alphabetical List of Instructions

• • ACALL – Absolute Call
  • ADD, ADDC – Add Accumulator (With Carry)
  • AJMP – Absolute Jump
  • ANL – Bitwise AND
  • CJNE – Compare and Jump if Not Equal
  • CLR – Clear Register
  • CPL – Complement Register
  • DA – Decimal Adjust
  • DEC – Decrement Register
  • DIV – Divide Accumulator by B
  • DJNZ – Decrement Register and Jump if Not Zero
  • INC – Increment Register
  • JB – Jump if Bit Set
  • JBC – Jump if Bit Set and Clear Bit
  • JC – Jump if Carry Set
  • JMP – Jump to Address

• JNB – Jump if Bit Not Set
• JNC – Jump if Carry Not Set
• JNZ – Jump if Accumulator Not Zero
• JZ – Jump if Accumulator Zero
• LCALL – Long Call
• LJMP – Long Jump
• MOV – Move Memory
• MOVC – Move Code Memory
• MOVX – Move Extended Memory
• MUL – Multiply Accumulator by B
• NOP – No Operation
• ORL – Bitwise OR
• POP – Pop Value From Stack
• PUSH – Push Value Onto Stack
• RET – Return From Subroutine
• RETI – Return From Interrupt
• RL – Rotate Accumulator Left
• RLC – Rotate Accumulator Left Through Carry
• RR – Rotate Accumulator Right
• RRC – Rotate Accumulator Right Through Carry
• SETB – Set Bit
• SJMP – Short Jump
• SUBB – Subtract From Accumulator With Borrow
• SWAP – Swap Accumulator Nibbles
• XCH – Exchange Bytes
• XCHD – Exchange Digits
• XRL – Bitwise Exclusive OR
• Undefined – Undefined Instruction