How do 80386 switches from real mode to protected mode?

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jaideepchoudhary

  • Mar 25th, 2012
 

Real mode is the mode where the base instruction set of 8086 microprocessor family can be executed , whereas in the Protected mode ,the instruction set with new and advanced instructions of the microprocessor can be executed ( later family members of the 8086 family are superset of previous ones).

Therefore,the object code is UPWARD COMPATIBLE , but not Downward compatible. So, when a processor(80386) gets an instruction from a new instruction set, it automatically switches from REAL to PROTECTED Mode.

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