Introduction The modern era of devices be it the devices used in education, our home, to our offices, to industrial automation, transportation, medicine, or in defence etc are all microprocessor or microcontroller based systems. The most common of the is the desktop or the laptop are microprocessor based systems. A microprocessor is an electronics programmable device that accepts the user input from memory or peripherals, processes it as per the instructions fetched from the memory and produces the result that can be stored back in memory or fed as input to other devices or applications. The word microprocessor is made from two words micro and processor. Until 1960 all systems were made using discrete components which lead to very large and