System consists of AT89C51, LED digital tube, keys, light

代码说明：

系统由AT89C51、LED 数码管、按键、发光二极管等部分构成，能实现时间的调整、定 时时间的设定，输出等功能。系统的功能选择由SB0、SB1、SB2、SB3、SB4 完成。其中SB0 -System consists of AT89C51, LED digital tube, keys, light-emitting diodes and other parts, to achieve the adjustment of the time, will be When the time set, the output functions. Function of the system choose from SB0, SB1, SB2, SB3, SB4 completed. One SB0