Does the PCF85063A RTC reset the clock counting when I write a new value in the "seconds" register?

[ugobugo]

Hello, I'm working with a PCF85063A RTC. For a sped up debug mode of my product, I want to rewrite the hour and date registers every about 2seconds. 

My question is the following. Let's say the RTC time is currently 12h 00m 00s and will switch to 12:00:01 in about 100ms. If in this moment I write a new time - for instance 13:45:30 - will the RTC switch to 13:45:31 in 100ms, or will the counting reset and the RTC will switch to 13:45:31 after 1 second?

[ugobugo]

Thank you!

[TomasVaverka · Accepted solution]

Hello,

When you write a new time to the PCF85063A at any moment, the internal time base continues counting uninterrupted. It means that if you write the new time just 100ms before the next second tick, the RTC will increment to 13:45:31 in 100ms, not after a full second. The counting does not reset and there is no delay or pause after a time write.

BRs, Tomas