This book is designed for courses on Microprocessors and Microcontrollers. It begins with the 8085 processor, one of the simplest, and progresses through more advanced processors like the 8086, 8088, Intel 286, 386, 486, and Pentium. For Microcontrollers, the journey starts with the 8051 and advances to include PIC, AVR, TI, and ARM. The text is concise and reader-friendly, featuring examples related to processors and major interfacing. It provides comprehensive coverage suitable for a single-semester course, complete with rich pedagogy and problem sets