For B.Tech. degree courses in Electronic and Instrumentation, Electronic Instrumentation and Control, Instrumentation and Control Engineering at U.P. Technical University, Lucknow, and other Technical Universities, this thorough text satisfies the course requirement on the subject of microcontroller. It will also be used by engineering students at Punjab Technical University as a textbook and a helpful study guide for exams. The book has eight chapters in total. An introduction and a review question and exercise problems are included in each chapter's conclusion. This book describes the characteristics of microcontrollers and includes in-depth explanations on the microcontrollers 8048, 8051, Intel 8096, and Motorola 68HC11, as well as programming in assembly language and microcontroller interfacing methods. Along with appropriate examples, a detailed explanation of the programmable logic controller has also been provided.