嵌入式杂谈-内部和外部RTC，亚秒计数器会自动清0吗？

STM32和DS3231，写入时间时，会自动清0

一、内部RTC，以STM32为例

1.写入时间，会自动清0

https://www.eevblog.com/forum/microcontrollers/stm-32f4-subseconds-how-can-it-work/https://www.eevblog.com/forum/microcontrollers/stm-32f4-subseconds-how-can-it-work/

2.读取亚秒

F4的RTC亚秒值获取 - STM32F407 - 硬汉嵌入式论坛 - Powered by Discuz!https://www.armbbs.cn/forum.php?mod=viewthread&tid=94173

https://www.cnblogs.com/zhulaoda/p/13161572.htmlhttps://www.cnblogs.com/zhulaoda/p/13161572.html

3.手动设置

https://www.cnblogs.com/ydmblog/p/16175017.htmlhttps://www.cnblogs.com/ydmblog/p/16175017.html

二、外部RTC，以DS3231为例

写入时间时，会自动清0

testing reliability and speed on 433 RF modules - Projects / General Guidance - Arduino Forumhttps://forum.arduino.cc/t/testing-reliability-and-speed-on-433-rf-modules/655721/13