The rising technological aspects demand that the students have basic programming skills, which is indeed the need of the hour. Microprocessors & microcontrollers are beyond the reach of average or par below-average students. Still, the fact of the matter is that every student will enjoy the intelligent devices working and their applications if concepts are made clear. This book is launched considering the student's difficulty in understanding the concepts, and an attempt is made here to present the concepts in a way the student understands them better. The language is simple. The illustrations are added to make the concepts even clearer, and the literature from the introduction to the end of the book will be knowledgeable to the students. Since this is the first edition, suggestions for further improvement in the text would be warmly welcomed. The authors hereby duly acknowledge all the writers and contributors in the field of academics.