单片机点亮数码管实验（不能用定时器功能）

P0口接1个八段式共阴极LED数码管，通过调用延时子程序，循环显示0-9，时间间隔自定，注意使用一维数组给出显示代码-MCU lit digital tube experiment (can not use the timer function)

P0 port connected to the 1 paragraph of the common cathode LED digital tube, by calling the delay subroutine, cycle display 0-9, time interval custom, pay attention to the use of one-dimensional array gives the display code