该文件夹包括实验报告，流程图，以及源代码．程序实现功能:在主程序运行期间,每5秒钟响铃一次；当键盘上的某个键被按下时,主程序和响铃都被挂起,显示器显示buffer缓冲区中的字符串,然后等待下一次按键引起的键盘中断；当键盘中断发生后,恢复主程序和响铃.这一过程可以重复任意次。-The folder including experiments, flow charts, as well as source code. Program functions : the main program during the operation, every five seconds a ringing; When the keyboard by pressing a button, main program and Bell were flown, the display shows a buffer buffer string, Then wait for the next keystroke caused by the keyboard interrupt; When the keyboard interrupt occurred, main program and resume ringing. This process can repeat any time.