说明：  /********************************************************* 本程序源代码由单片机培训网提供. 单片机培训网,让更多人学习单片机更容易. 第一网址----www.mcuedu.com 第二网址----http://51_train.nease.net 创办人------刘永忠 热线电话----13088847866 email-------aa815@163.com 本程序实现七段码动态显示并在个位为零时进入省电模式， 当外中断0管脚来一个下降沿触发时，退出省电模式功能. ***********************************************************/
(/********************************************************* the source code provided by the single-chip networks training. single-chip training network, single chip so that more people learn more easily. first website---- www. mcuedu . com second site---- http:// 51_train.nease.net founder Liu Yongzhong------ hotline---- 13088847866 email------- aa815 @ 163 . com the program code and seventh dynamic display and enter a single-zero power mode when external interrupt 0 pin to a falling edge trigger, the functions from the power-saving mode.*********************************************************** /)