RF8085 Instruction Set: Opcodes, Operands, Size, M-Cycle, T-Cycle
instruction set
8085
opcode
machine cycle
tstate
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This page provides a comprehensive overview of the 8085 instruction set. The instructions are detailed with their opcode, operand, instruction size (in bytes), number of Machine cycles (M-cycle), and number of T-states.
Table 1: List of All 8085 Instructions with their Opcodes, Operands, Instruction Size, Number of Machine Cycles, Number of T-states
| Instruction | Op-code | Operand | Bytes | Machine-cycles | T-states | Detail |
|---|---|---|---|---|---|---|
| ACI | ACI | 8 bit data | 2 | 2 | 7 | Add immediate to Accumulator with Carry |
| ADC | ADC | Reg., Mem. | 1,1 | 1,2 | 4,7 | Add register to accumulator with carry |
| ADD | ADD | Reg., Mem. | 1,1 | 1,2 | 4,7 | Add register to Accumulator |
| ADI | ADI | 8-bit, data | 2 | 2 | 7 | Add immediate to accumulator |
| ANA | ANA | Reg., mem. | 1,1 | 1,2 | 4,7 | Logical AND with Accumulator |
| ANI | ANI | 8-bit, data | 2 | 2 | 7 | AND immediate with accumulator |
| CALL | CALL | 16-bit address | 3 | 5 | 18 | Unconditional Subroutine call |
| CMA | CMA | None | 1 | 1 | 4 | Complement Accumulator |
| CMC | CMC | None | 1 | 1 | 4 | Complement Carry |
| CMP | CMP | Reg., Mem. | 1,1 | 1,2 | 4,7 | Compare with accumulator |
| CPI | CPI | 8-bit | 2 | 2 | 7 | Compare Immediate with accumulator |
| DAA | DAA | None | 1 | 1 | 4 | Decimal Adjust Accumulator |
| DAD | DAD | Reg.Pair | 1 | 3 | 10 | Add register pair to H and L registers |
| DCR | DCR | Reg., Mem. | 1,1 | 1,3 | 4,10 | Decrement source by 1 |
| DCX | DCX | Reg. Pair | 1 | 1 | 6 | Decrement register pair by 1 |
| DI | DI | None | 1 | 1 | 4 | Disable Interrupts |
| EI | EI | None | 1 | 1 | 4 | Enable Interrupts |
| HLT | HLT | None | 1 | 2 or more | 5 or more | Halt and enter wait state |
| IN | IN | 8-bit port address | 2 | 3 | 10 | Input data to accumulator from a port with 8-bit address |
| INR | INR | Reg.,Mem. | 1,1 | 1,3 | 4,10 | Increment contents of register/Memory by 1 |
| INX | INX | Reg. Pair | 1 | 1 | 6 | Increment register pair by 1 |
| JMP | JMP | 16 bit | 3 | 3 | 10 | Jump unconditionally |
| LDA | LDA | 16 bit address | 3 | 4 | 13 | Load accumulator direct |
| LDAX | LDAX | B/D reg. Pair | 1 | 2 | 7 | Load accumulator indirect |
| LHLD | LHLD | 16 bit address | 3 | 5 | 16 | Load H and L registers direct |
| LXI | LXI | Reg. Pair, 16 bit data | 3 | 3 | 10 | Load Register Pair Immediate |
| MOV | MOV | Rd,Rs; M,Rs; Rd,M | 1 | 1; 2; 2 | 4; 7; 7 | Move-copy from source to destination |
| MVI | MVI | Reg., Data; Mem., Data | 2 | 2; 3 | 7; 10 | Move immediate 8 bit |
| NOP | NOP | None | 1 | 1 | 4 | No Operation |
| ORA | ORA | Reg., Mem. | 1,1 | 1,2 | 4,7 | Logically OR with Accumulator |
| ORI | ORI | 8 bit data | 2 | 2 | 7 | Logically OR Immediate |
| OUT | OUT | 8-bit port address | 2 | 3 | 10 | Output Data from Accumulator to a port with 8 bit address |
| PCHL | PCHL | None | 1 | 1 | 6 | Load program counter with HL contents |
| POP | POP | Reg. pair | 1 | 3 | 10 | POP OFF Stack to register pair |
| PUSH | PUSH | Reg. pair | 1 | 3 | 12 | Push register pair into stack |
| RAL | RAL | None | 1 | 1 | 4 | Rotate accumulator left through carry |
| RAR | RAR | None | 1 | 1 | 4 | Rotate accumulator right through carry |
| RLC | RLC | None | 1 | 1 | 4 | Rotate Accumulator Left |
| RRC | RRC | None | 1 | 1 | 4 | Rotate Accumulator Right |
| RET | RET | None | 1 | 3 | 10 | Return from subroutine unconditionally |
| RIM | RIM | None | 1 | 1 | 4 | Read Interrupt Mask |
| SBB | SBB | Reg., Mem. | 1,1 | 1,2 | 4,7 | Subtract source and borrow from accumulator |
| SBI | SBI | 8 bit data | 2 | 2 | 7 | Subtract immediate with borrow |
| SHLD | SHLD | 16 bit address | 3 | 5 | 16 | Store H and L registers direct |
| SIM | SIM | None | 1 | 1 | 4 | Set Interrupt Mask |
| SPHL | SPHL | None | 1 | 1 | 6 (in 8085), 5(in 8080) | Copy H and L registers to the Stack pointer(SP) |
| STA | STA | 16 bit | 3 | 4 | 13 | Store Accumulator Direct |
| STAX | STAX | B/D reg. pair | 1 | 2 | 7 | Store Accumulator Indirect |
| STC | STC | None | 1 | 1 | 4 | Set Carry |
| SUB | SUB | Reg., Mem. | 1,1 | 1,2 | 4,7 | Subtract register or memory from Accumulator |
| SUI | SUI | 8 bit data | 2 | 2 | 7 | Subtract immediate from accumulator |
| XCHG | XCHG | None | 1 | 1 | 4 | Exchange H and L with D and E |
| XRA | XRA | Reg., Mem. | 1,1 | 1,2 | 4,7 | Exclusive OR with accumulator |
| XRI | XRI | 8 bit data | 2 | 2 | 7 | Exclusive OR immediate with accumulator |
| XTHL | XTHL | None | 1 | 5 | 16 | Exchange H and L with top of stack |
