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Program execution transfer instructions in 8086 microprocessor
These instructions are used to transfer/branch the instructions during an execution. There are two types of branching instructions. The unconditional branch and conditional branch.
The Unconditional Program execution transfer instructions are as follows.
| Opcode | Operand | Description |
|---|---|---|
| CALL | address | Used to call a procedure and save their return address to the stack. |
| RET | ---- | Used to return from the procedure to the main program. |
| JMP | address | Used to jump to the provided address to proceed to the next instruction. |
| LOOP | address | Used to loop a group of instructions until the condition satisfies, i.e., CX = 0 |
Now let us see the Conditional Program execution transfer instructions.
| Opcode | Operand | Description |
|---|---|---|
| JC | address | Used to jump if carry flag CY = 1 |
| JNC | address | Used to jump if no carry flag (CY = 0) |
| JE/JZ | address | Used to jump if equal/zero flag ZF = 1 |
| JNE/JNZ | address | Used to jump if not equal/zero flag ZF = 0 |
| JO | address | Used to jump if overflow flag OF = 1 |
| JNO | address | Used to jump if no overflow flag OF = 0 |
| JP/ JPE | address | Used to jump if parity/parity even PF = 1 |
| JNP/ JPO | address | Used to jump if not parity/parity odd PF = 0 |
| JS | address | Used to jump if sign flag SF = 1 |
| JNS | address | Used to jump if not sign SF = 0 |
| JA/ JNBE | address | Used to jump if above/not below/equal instruction satisfies. |
| JAE/ JNB | address | Used to jump if above/not below instruction satisfies. |
| JBE/ JNA | address | Used to jump if below/equal/ not above instruction satisfies. |
| JG/ JNLE | address | Used to jump if greater/not less than/equal instruction satisfies. |
| JGE/ JNL | address | Used to jump if greater than/equal/not less than instruction satisfies. |
| JL/ JNGE | address | Used to jump if less than/not greater than/equal instruction satisfies. |
| JLE/ JNG | address | Used to jump if less than/equal/if not greater than instruction satisfies. |
| JCXZ | address | Used to jump to the provided address if CX = 0 |
| LOOPE/ LOOPZ | address | Used to loop a group of instructions till it satisfies ZF = 1 & CX = 0 |
| LOOPNE/ LOOPNZ | address | Used to loop a group of instructions till it satisfies ZF = 0 & CX = 0 |
Updated on: 2019-07-30T22:30:25+05:30
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