Principles and Applications of Microcomputers is a comprehensive textbook, which exemplifies the fundamental principles and applications of microcomputers with the most popular 8051 microcontroller and the Keil C51-MDK (microcomputer development kit). After reading this book, you will be able to design various microprocessor- or microcomputer-based application systems. The main features of this book are as follows: -- Partition the MCS-51 instruction set into many pedagogic groups suitable for entry-level readers and then illustrate them with an abundant number of examples. -- Introduce MCS-51 C programming with most popular topics and then balance the programming of assembly-language and C programs in the design of MCS-51 microcontroller applications.-- Divide the MCS-51 system into the software model and the hardware model. The software model is first introduced and then the hardware model follows. This way greatly facilitates the reader to study a microcomputer system.-- Discuss in detail features and applications of SRAM and Flash. The design of memory modules and the timing consideration related to the MCS-51 are also involved. -- Deal with the interrupt handling, system reset, and watchdog, as well as power control and management of the MCS-51 system.-- Detail I/O concepts and structures, serial/parallel data transfer and control, and ADC/DAC circuits, as well the structures and features of MCS-51 I/O ports, including serial port, SPI, and I2C. Besides, various timers/counters are dealt with in depth.-- Address the structures, functions, and applications of various timers/counters and programmable timers. -- Involve design principles of keyboards circuits, including both polling and interrupt methods, as well as circuit modules and applications of LED and LCD displays. -- Provide an abundance of review questions to each section to help readers evaluate their understandings about the topics introduced in the section. This book can be used as the textbook for the following courses and others: Assembly-Language Programming, Fundamental Principles of Microcomputers, or Principles and Applications of Microcomputers.