在单片机的产品设计中，人机界面是非常重要的部分，而且随着系统的日益复杂，以及人们对产品的人机交互能力的要求不断提升，常握单片机系统中的人机界面基础设计能力成为了学习单片机的基础课程，而4X4 键盘的操作和LCD显示是人机界面设计的基础内容，掌握这些基础设计能力，加深对人机界面的认识，同时提高人机界面系统设计能力。-At SCM Product design, human-machine interface is a very important part of, and along with increasingly complex systems, as well as people' s products, the ability of human-computer interaction than ever, often single-chip microcomputer system in the hands of man-machine interface design capability has become the basic study of the basic curriculum Singlechip, and 4X4 keypad operation and LCD display is the basic man-machine interface design content, master these basic design capabilities, deepen understanding of human-computer interface, simultaneously improve human-machine interface system design capability.