键盘是由若干按钮组成的开关矩阵，它是单片机系统中最常用的输入设备，用户能通过键盘向计算机输入指令、地址和数据。一般单片机系统中采和非编码键盘，非编码键盘是由软件来识别键盘上的闭合键，它具有结构简单，使用灵活等特点，因此被广泛应用于单片机系统。-The keyboard is composed by a number of push button switch matrix, which is the most commonly used single-chip system, the input device, the user input instructions to the computer via the keyboard, the address and data. General SCM system mining and non-coding keyboard, the keyboard is a non-coding software to identify the key on the keyboard is closed, it has a simple structure, flexible features, it is widely used in microprocessor systems.