clockDS1302

代码说明：

  该源程序的功能是设计一个时钟，时钟精度还可以，这是单片机学习的一个进阶吧，掌握了它，也算是对单片机有比较熟练的应用了，加油(The source function is to design a clock, clock accuracy can be, this is an advanced single-chip learning it, grasp it, can be considered a relatively skilled microcontroller applications, the refueling)