RTC 实时时钟，主要用于实现长时间计时。模块包括可选8：1 分频器，一个定时器T14，及一个32 位RTC 计数器。本例程介绍RTC的DAVE配置以及KEIL的编程指导-RTC Real Time Clock, mainly used to achieve a long time. Module includes an optional 8:1 divider, a timer T14, and a 32-bit RTC counter. The routine introduction of DAVE RTC configuration and programming guidance KEIL