Microprocessor plays a very important role in present life. Their applications have given us a very easy and flexible life. In fact, Microprocessor System is a core subject for undergraduate and postgraduate students in Electrical Engineering, Electronics Engineering, Computer Science and Information Technology to understand the present advent and applications. This book is primarily intended to serve as a textbook in accordance with the syllabus of Microprocessor System offered by various universities in India as well as abroad.