时钟芯片1302的驱动程序实现， 1302 s Driver

基于51单片机与时钟芯片定时1302数码管显示年月日，星期要从新单接接个数码管，数据位接P0口，程序里在显示星期函数中改为P0=table2[(sum 7)] ，所有的都是共阳管子。-Based on 51 MCU and clock chip timing 1302 digital tube display year, month, day, week new single pick up digital tube, data bits then P0 mouth, the program

DS1302通讯程序，应该对没有使用过的人很有帮助(DS1302 communication program should be helpful for people who have never been used.)