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This textbook provides practicing scientists and engineers an advanced treatment of the AtmelAVR microcontroller. This book is intended as a follow on to a previously published book, titled“Atmel AVR Microcontroller Primer: Programming and Interfacing.’’ Some of the content fromthis earlier text is retained for completeness. This book will emphasize advanced programming andinterfacing skills. We focus on system level design consisting of several interacting microcontrollersubsystems. The first chapter discusses the system design process. Our approach is to provide theskills to quickly get up to speed to operate theinternationally popular Atmel AVR microcontrollerline by developing systems level design skills. We use the Atmel ATmega164 as a representativesample of the AVR line. The knowledge you gain on this microcontroller can be easily translated toevery other microcontroller in the AVR line. In succeeding chapters, we cover the main subsystemsaboard the microcontroller, providing a short theory section followed by a description of the relatedmicrocontroller subsystem with accompanying software for the subsystem. We then provide advancedexamples exercising some of the features discussed. In all examples, we use the C programminglanguage. The code provided can be readily adapted to the wide variety of compilers available forthe Atmel AVR microcontroller line. We also include a chapter describing how to interface themicrocontroller to a wide variety of input and output devices. The book concludes with severaldetailed system level design examples employing the Atmel AVR microcontroller.