RTC: Setting time - protection?

[vespaman]

Is there any preferred way of setting the RTC registers, so that the operation is 'atomic'?

The 52259 rm is not really helpful on this, but I fear that there may be a second change while I am writing the new time. 

[vier_kuifjes · Accepted solution]

It might help to write the seconds register first. If you make sure not to write '59' as value, the seconds will not overflow during the write of the other registers.