说明：  SN8P2501B_RTC是经笔者验证，投入实际生产过的源代码，如果SN8P2501B_规格书RTC功能说明做出来RTC会掉周期，误差是0.5S的倍数，在绿色模式RTC唤醒，要查询T0中断标志，并且要等待16US才能清除中断标志，否则计时出错
(SN8P2501B_RTC is verified by the author, put into actual production over the source code, if SN8P2501B_ Functional Description Specification RTC RTC to do it will be out period, the error is a multiple of 0.5S, and in green mode RTC wake, to query T0 interrupt flag, and to wait 16US to clear the interrupt flag, otherwise the timing error)