内有C51语言和C语言以及汇编语言的对比，单片机内部资源、扩展资源及其编程；有应用实例，通过实例，读者可以在工作中进行类比编程，又可以开阔思路，提高实际工作能力。-There C51 language and C language and assembly language contrast, MCU internal resources, expansion of resources and their programming are examples of application, by