利用51单片机制作时钟。实现功能：运行后可以中断进入调时间，可以中断进入调闹钟。整点可以报时。到了闹钟时间也可以闹铃。-The use of single-chip microcomputer 51 production of the clock.The realization of functions: running can interrupt in time, can tune into the clock interrupt.The whole point can tell.The al