M41ST87W RTC Module Read problem

[elehab]

We use M41ST87W as RTC module. We set the stop bit (ST) to 0. We can also observe the frequency at the F32K output. We constantly read the Second register but we do not see any change. What could be the reason for this?

[Andrew Neil]

welcome to the forum.

You need to give more details for people to be able to help

see: How to write your question to maximize your chances to find a solution

and: How to insert source code.

Are you using ST's provided code?

https://www.st.com/en/clocks-and-timers/m41st87w.html#tools-software