ARITHMETIC OPERATIONS
| Mnemonic | Description | Bytes | Cycles |
| ADD A,Rn | Add register to A | 1 | 1 |
| ADD A, direct | Add direct byte to A | 2 | 1 |
| ADD A,@Ri | Add indirect RAM to A | 1 | 1 |
| ADD A,#data | Add immediate data to A | 2 | 1 |
| ADDC A,Rn | Add register to A with Carry | 1 | 1 |
| ADDC A,direct | Add direct byte to A with Carry | 2 | 1 |
| ADDC A,@Ri | Add indirect RAM to A with Carry | 1 | 1 |
| ADDC A,#data | Add immediate data to A with Carry | 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 A | 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 A | 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 & B (A x B => BA) | 1 | 4 |
| DIV AB | Divide A by B (A/B => A + B) | 1 | 4 |
| DA A | Decimal Adjust A | 1 | 1 |
LOGICAL OPERATIONS
| Mnemonic | Description | Bytes | Cycles |
| ANL A,Rn | AND register to A | 1 | 1 |
| ANL A,direct | AND direct byte to A | 2 | 1 |
| ANL A,@Ri | AND indirect RAM to A | 1 | 1 |
| ANL A,#data | AND immediate data to A | 2 | 1 |
| ANL direct,A | AND A to direct byte | 2 | 1 |
| ANL direct,#data | AND immediate data to direct byte | 3 | 2 |
| ORL A,Rn | OR register to A | 1 | 1 |
| ORL A,direct | OR direct byte to A | 2 | 1 |
| ORL A,@Ri | OR indirect RAM to A | 1 | 1 |
| ORL A,#data | OR immediate data to A | 2 | 1 |
| ORL direct,A | OR A to direct byte | 2 | 1 |
| ORL direct,#data | OR immediate data to direct byte | 3 | 2 |
| XRL A,Rn | Exclusive-OR register to A | 1 | 1 |
| XRL A,direct | Exclusive-OR direct byte to A | 2 | 1 |
| XRL A,@Ri | Exclusive-OR indirect RAM to A | 1 | 1 |
| XRL A,#data | Exclusive-OR immediate data to A | 2 | 1 |
| XRL direct,A | Exclusive-OR A to direct byte | 2 | 1 |
| XRL direct,#data | Exclusive-OR immediate data to direct byte | 3 | 2 |
| CLR A | Clear A | 1 | 1 |
| CPL A | Complement A | 1 | 1 |
| RL A | Rotate A Left | 1 | 1 |
| RLC A | Rotate A Left through Carry | 1 | 1 |
| RR A | Rotate A Right | 1 | 1 |
| RRC A | Rotate A Right through Carry | 1 | 1 |
| SWAP A | Swap nibbles within A | 1 | 1 |
DATA TRANSFER
| Mnemonic | Description | Bytes | Cycles |
| MOV A,Rn | Move register to A | 1 | 1 |
| MOV A,direct | Move direct byte to A | 2 | 1 |
| MOV A,@Ri | Move indirect RAM to A | 1 | 1 |
| MOV A,#data | Move immediate data to A | 2 | 1 |
| MOV Rn,A | Move A 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 A 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 A 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 16-bit constant | 2 | 1 |
| MOVC A,@A+DPTR | Move Code byte relative to DPTR to A | 1 | 2 |
| MOVC A,@A+PC | Move Code byte relative to PC to A | 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 A | 1 | 1 |
| XCH A,direct | Exchange direct byte with A | 2 | 1 |
| XCH A,@Ri | Exchange indirect RAM with A | 1 | 1 |
| XCHD A,@Ri | Exchange low-order Digit indirect RAM with A | 1 | 1 |
BOOLEAN VARIABLE MANIPULATION
| Mnemonic | Description | Bytes | Cycles |
| 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 flag | 2 | 2 |
| ORL C,bit | OR direct bit to Carry flag | 2 | 2 |
| ORL C,/bit | OR complement of direct bit to Carry flag | 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 AND MACHINE CONTROL
| Mnemonic | Description | Bytes | Cycles |
| 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 Jump | 3 | 2 |
| SJMP rel | Short Jump (relative addr) | 2 | 2 |
| JMP @A+DPTR | Jump indirect relative to DPTR | 1 | 2 |
| JZ rel | Jump if A is Zero | 2 | 2 |
| JNZ rel | Jump if A is Not Zero | 2 | 2 |
| JC rel | Jump if Carry flag is set | 2 | 2 |
| JNC rel | Jump if No Carry flag | 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 & Clear bit | 3 | 2 |
| CJNE A,direct,rel | Compare direct to A & Jump if Not Equal | 3 | 2 |
| CJNE A,#data,rel | Compare immediate to A & Jump if Not Equal | 3 | 2 |
| CJNE Rn,#data,rel | Compare immed. to reg. & Jump if Not Equal | 3 | 2 |
| CJNE @Ri,#data,rel | Compare immed. to ind. & Jump if Not Equal | 3 | 2 |
| DJNZ Rn,rel | Decrement register & Jump if Not Zero | 2 | 2 |
| DJNZ direct,rel | Decrement direct byte & Jump if Not Zero | 3 | 2 |
| NOP | No operation | 1 | 1 |
Notes on program addessing modes
| Rn | Working register R0-R7 |
| direct | 128 internal RAM locations, any I/O port, control or status register |
| @Ri | Indirect internal RAM location addressed by register R0 or R1 |
| #data | 8-bit constant included in instruction |
| #data16 | 16-bit constant included in instruction |
| bit | 128 software flags, any I/O pin, control or status bit |
Notes on data addessing modes
| addr16 | Destination address may be anywhere in 64-kByte program address space |
| addr11 | Destination address will be within same 2-kByte page of program address space as first byte of the following instruction |
| rel 8-bit | offset relative to first byte of following instruction (+127, -128) |
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