DS1337 RTC Problem

I am using a DS1337 (Not the C version) and facing a weired problem.

As per the DS1337 data sheet, whenever the second register is gets updated then the internal counter gets reset and there will a 1sec to complte the remaining time values write into RTC(min, hour,sec..).

But it is not happening like that... when ever i writes a time into RTC(for example 1hour 30min and 59sec) sometimes the seconds value is drifted into 00.

Due to this behaviour,the RTC time is drifted 1min less(1:30:00) than the actual time..

Any thoughts?

Thanks

Are you writing the registers in 1 burst so that there is only 1 stop bit after all bytes have been transferred. Note a restart is counted as a stop bit.

Mike.

Thanks Mike..

Yes, i am writing in one go without any stop in between... eventhough the issue is coming..