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problem in ds12887 time

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Ali1719

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I have made clock with 89c51 with ds 12887, but its time is advance 10 seconds in each minute. how do I rectify the problem.I already changed two 12887.
 

Can you please post your schematic and your code?
I too am currently working on making an RTC with 89S52 and 12887, so maybe I can help you.
 
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