一个跑马灯的程序，按1键顺序显示0-9，间隔为1，按2键顺序显示0-8，间隔为2。设置中断使时间间隔为1秒-A Marquee procedures, according to one key sequence shows 0-9 and spaced at 1, 2 keys appear in the order 0-8, interval is 2. Interrupt enable set time interval of 1 second