Book excerpt: Microprocessor, Microcomputer and their Applications, 3/e, in three parts, covers the hardware, software and the applications of microcomputers. This book covers single chip microcomputers (microcontrollers) emphasizing on the architecture, memory organization, programming technique and a large number of programming examples. Interfacing techniques have been explained clearly with the aid of diagrams, charts and tables alongwith the input/output devices and controlling and peripheral devices.The book is intended for undergraduate and postgraduate students of Computer Science and Engineering, Electrical Engineering, Electronics and Allied fields of engineering and sciences.