This book first introduces relevant concepts of microcomputers and applications of embedded systems, then illustrates Cortex M3 microprocessor architecture and development methods, as well as the assembly language and its programming. In terms of application development, STM32F103VET6 is used as the background to introduce principles and applications of common interfaces. According to the requirements of higher engineering education on the cultivation of operational ability, it is closely integrated with learning platform and focuses on the compilation of experimental and practical contents, and the book contains abundant experiments. The sample codes related to the learning platform in the textbook have been strictly simulated and debugged by the author.