美国DALLAS公司推出的具有涓细电流充电能力的低功耗实时时钟电路DS1302的结构、工作原理及其在实时显示时间中的应用。它可以对年、月、日、周日、时、分、秒进行计时，且具有闰年补偿等多种功能。给出DS1302在读写中的C51程序及流程图，以及在调试过程中的注意事项。-DALLAS U.S. companies have launched small trickle current charging the capacity of low-power real time clock DS1302 circuit structure, working principle and its application in real-time display of time of application. It can be years, months, days, weekdays, hours, minutes and seconds for time, and has multiple functions, such as a leap year compensation. DS1302 are given in the C51 to read and write procedures and flow chart, as well as in debugging in the process of attention.