S32KのトピックRe: S32K146 RTC

S32K146 RTC

Artemis — Wed, 31 Jan 2024 03:18:43 GMT

I want to test the difference between the MCU internal clock and the real clock, and I want to use the RTC module to record the time, but I do not know whether it is my configuration problem or other reasons, the RTC clock is nearly 5 minutes slower than the real time every hour. The LPO clock I use, Can you tell me how to configure the RTC module if I want to accurately time.Thanks

Re: S32K146 RTC

Senlent — Wed, 31 Jan 2024 06:00:42 GMT

Hi@Artemis

please refer to this article

https://mp.weixin.qq.com/s?__biz=MzI0MDk0ODcxMw==&mid=2247485911&idx=1&sn=4b03e885788c18db5d55fdfc52c852e5&chksm=e9124d51de65c447d9af32433ef47d8546888d7bd4a241dd6b4808dd68bb8e24da8534b79910&scene=21#wechat_redirect

Re: S32K146 RTC

Artemis — Wed, 31 Jan 2024 06:48:07 GMT

Thank you.The accuracy has improved a lot after using LPO compensation, but still, I am considering using external crystal oscillator to achieve accurate timing

Re: S32K146 RTC

Artemis — Wed, 31 Jan 2024 08:02:34 GMT

When I followed the tutorial to configure when I encountered a problem, when set to 32kHz crystal, the time count is very fast, the external one second, the internal clock ran more than ten minutes, I would like to ask why this problem. thank you.

Re: S32K146 RTC

Senlent — Wed, 31 Jan 2024 08:47:26 GMT

Hi@Artemis

It may be that your RTC-related clock is not configured correctly. Please refer to the routines in the IDE or the demo in the link. This is not a very complicated problem.