Jump instructions in 8086 microprocessors are used to change the flow of instruction execution. There are two types of jump instructions: unconditional jump instructions which do not check any flags, and conditional jump instructions which check flags like carry or zero before jumping. Common jump instructions include unconditional JMP, and conditional JC, JE, JNE, JP, JNP. Loop instructions use the CX register as a counter, decrementing it each pass through the loop until CX reaches zero.

1. JUMP&LOOP
INSTRUCTION

2. JUMP INSTRUCTION IN 8086
MICROPROCESSOR
JUMP INSTRUCTIONS ARE USED FOR CHANGING THE
FLOW OF EXECUTION OF INSTRUCTIONS IN THE
PROCESSOR.
IF WE WANT JUMP TO ANY INSTRUCTION IN BETWEEN
THE CODE, THEN THIS CAN BE ACHIEVED BY THESE
INSTRUCTIONS.
THERE ARE TWO TYPES OF JUMP INSTRUCTIONS:
1.UNCONDITIONAL JUMP INSTRUCTIONS
2.CONDITIONAL JUMP INSTRUCTIONS

3. Unconditional Jump
Instructions
 Unconditional jump instruction does not check for any
flag instruction

4. JC : Stands for 'Jump if Carry'
It checks whether the carry flag is set or not. If yes, then jump takes place, that is: If CF = 1,
then jump
JE / JZ : Stands for 'Jump if Equal' or 'Jump if Zero'
It checks whether the zero flag is set or not. If yes, then jump takes place, that is: If ZF = 1,
then jump.
JNE / JNZ : Stands for 'Jump if Not Equal' or 'Jump if Not Zero'
It checks whether the zero flag is reset or not. If yes, then jump takes place, that is: If ZF = 0,
then jump.
Conditional Jump Instruction
 Conditional jump instruction must be check for any
flag instruction

5. MOV AL,255
ADD AL,1
JC label 1
PRINT ‘no carry’
JMP exit
label 1:
PRINT ‘has carry’
exit:
RET
Example:
JP / JPE : Stands for 'Jump if Parity' or 'Jump if Even Parity'
It checks whether the Parity flag is set or not. If yes, then jump takes place, that is: If
PF = 1, then jump.
JNP / JPO : Stands for 'Jump if Not Parity' or 'Jump if Odd Parity'
It checks whether the Parity flag is reset or not. If yes, then jump takes place, that
is: If PF = 0, then jump.

6.  The Loop instructions use the CX register to indicate
the loop count.
 The Loop instruction decrements CX without changing
any flags
 If CX is not zero after the decrement, control is
transferred to the destination label
Loop Instruction