单个共阳数码管如图5-1所示，用8位杜邦线将并行口P1与J6相连，在数码管上循环显示0~9。每个数字显示1S。定时使用延时程序。(A single anode digital tube as shown in Figure 5-1, the parallel port P1 is connected to J6 with 8 DuPont line, in the digital tube display cycle 0~9. Each digit shows 1S. Timed delay program.)