This introductory book “Microprocessor and interfacing has been written to serve such a purpose. This book is suitable for Diploma, B.Sc./M.Sc., AMIE, M.C.A., IETE, and B.E./B.Tech courses for all Institutions/Universities. This Book “Microprocessor and Interfacing†describes, from Basics of microprocessors to advanced Microprocessor, how to interface various peripheral devices with a microprocessor, a number of assembly language programs. This Book provides a variety of questions and problems for assignments and examination questions. “Microprocessor and Interfacingâ€. has been written to facilitate better understanding of microprocessor. The book gives detailed study of 8-Bit Microprocessors 8085, Interfacing Standards RS232C, IEEE 488, Interfacing Chips 8253, 8257, 8259, 8251 and study of Microcontroller. Book also gives detailed study of other 8-Bit Microprocessor. In depth explanation of Advanced Microprocessors is also given in the book