以51芯片为核心的汇编实现时钟显示数码管，使用74hc164芯片驱动数码管，移位显示数据，可减少IO的实用。-To 51 chips at the core of the compilation of the realization of the digital clock display tubes, the use of digital control 74hc164 chip-driven, shift display data can be useful to reduce the IO