More than just a reference guide, this text provides specific information and examples for the Motorola M68HC11 microcontroller. The goal is to give the extra information needed to become proficient at using the M68HC11 by explaining and giving specific examples of many details found in the M68HC11 Reference Manual. It can be used alone or as a supplement and companion to Microcomputers and Microcontrollers: Principles of Hardware and Software Engineering, and it include a study plan outlining how to use the two together. The text is intended for use in a Microprocessor course in electrical engineering and computer science at the junior/senior undergraduate level.