这里有一个简单的计数器，0-99，也可以扩展到0-9999……，我想说的是关于一个简单时钟的也可以用这个来做，对于初学单片机的同学，很实用！-There is a simple counter ,0-99, can also be extended to 0-9999 ... ..., I want to say is about a simple clock can also use this to do for the beginner Student SCM, it is practica