掌握单片机的应用开发需要一个过程。首先必须掌握数字电路和模拟电路方面的知识，还必须学习单片机原理、硬件结构、扩展接口和编程语言。-master SCM application development requires a process. One must first master digital circuits and circuit simulation in terms of knowledge, must also learn SCM principle, hardware struc