用c语言编写的一键多功能按键识别。用AT89C51单片机做控制芯片，程序用keil编写，实验仿真有protel99se实现，已验证成功，该文件中有源程序和仿真文件。-Using c language identification of a key multi-function buttons. To do with the AT89C51 microcontroller control chip, the program using keil write, experimental simula