This is the first text book from an Indian author, covering the whole syllabus of “8051 Microcontroller Architecture, Programming and Application”. This text book is basically written for the beginners in the field of Electronics to acquire proper understanding. The contents of the book are well organized and every topic is developed in simple language with illustrations, block diagrams, specifications, applications and comparative tables. Summary has been added at the end of the each chapter. Every major concept is worked out through examples, to a numerical conclusion. The first chapter introduces the fundamental subjects of Microprocessor and microcontroller.