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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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