本书在《新编MCS-51单片机应用设计》第二版的基础上，从应用的角度，详细地介绍了MCS-51单片机的硬件结构、指令系统、各种硬件接口设计、各种常用的数据运算和处理程序、接口驱动程序以及MCS-51单片机应用系统的设计，并对MCS-51单片机应用系统设计中的抗干扰技术以及各种新器件也作了详细的介绍。本书突出了选取内容的实用性、典型性。书中的应用实例，大多来自科研工作及教学实践，且经过检验。-In the second edition of the New MCS-51 microcontroller application design based on the book, from the application point of view, detailed descr iption of the MCS-51 microcontroller hardware architecture, instruction set, a variety of hardware interface design, a variety of commonly usedcomputing and data processing procedures, the interface driver, MCS-51 microcomputer application system design, and MCS-51 microcontroller application design anti-jamming technology and a variety of new devices are introduced in detail. The book highlights the practicality of the selected content, typical. Application examples in the book, mostly from the research work and teaching practice, and tested.