利用AT2051实现简单的电子时钟功能，不是我自己写的，是随书光盘的内容，不是侵权，是想让大家初步了解，何况，程序还要自己调试。-Using AT2051 simple electronic clock function, not my own writing, the contents of CD with the book is not infringement, is to make you a preliminary understanding, not to mention the p