This book is about the Atmel’s AVR RISC microcontroller series. It covers architecture, design, and usage of this controller in various sample applications. Atmel Corporation (www.atmel.com) is a leading manufacturer of integrated circuits (ICs). AVR is the name of a microcontroller series that Atmel produces and that is the subject of this book. RISC (Reduced Instruction Set Computer) is a popular architecture for modern processors (more about RISC in a later chapter).