ds1302是美国dalas公司生产的实时时钟芯片，它具有精度高，体积小的特点，具有闰年补偿功能，夏令自动调整功能，每月误差在1分钟左右，使用方便。使用时外部接32.768K晶振。-ds1302 U.S. dalas produced real-time clock chip, which has high accuracy, small features, with leap year compensation, automatic daylight saving adjustment, th