程序将键盘输入的模拟量转化为数字量，识别具体的键值并进行显示。识别键值时的分界标准根据不同的键盘硬件而不同，具体应用时可以测定之后转化为数字量后再应用。-Keyboard input program into a digital analog to identify specific keys and displays. Identify the boundaries of standard keys when the keyboard according to different hardware and different, specific applications can be converted into digital measured again after application.