C51单片机， 对P1口所接8只发光二极管，编写相应的程序使发光二极管循环点亮。其中每一个发光二极管亮的时间为0.5S，0.5S的时间要求用定时中断实现。 （已知单片机晶振频率为12 .00MHz）-C51 microcontroller, for P1 mouth then eight light-emitting diodes, preparation of the corresponding program makes light-emitting diode light cycle. Each of the light-emitting diode light time is 0.5S, 0.5S time requirements to use the timer to achieve. (Known as a single-chip oscillator frequency 12 .00 MHz)