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常见问答
在M451系列,VBAT与VDD各自独立供电时,当VDD上电后,为什么读出RTC_TIME和RTC_CAL的值是错误的? 日期:2016-06-27
这是因为RTC_TIME 和 RTC_CAL这两个缓存器是由RTC Counter触发更新,请参考下图,而RTC Counter是每秒更新一次。
因此要解决上电同步问题,请等待一秒,待RTC Counter更新RTC_TIME 和 RTC_CAL后,再读取缓存器的值。
产品: | 微控制器 ,Arm Cortex-M4 微控制器 ,M451 Base 系列 ,M452 USB 系列 ,M453 CAN 系列 |
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应用: | |
功能: | Peripherals,Timer and PWM,RTC |