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 Posted: Feb 29, 2012 - 09:50 PM |
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Joined: Jul 16, 2010
Posts: 30
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I'm interfacing a DS3234 RTC with an AVR and have a strange problem...
I poll the seconds register by sending a "&h00" by SPI and get the following seconds counts (decimal, when anded with &B00001111 for the last 4 "ones seconds" bits):
0,1,2,3,4,8,9,10,11,12,0 (repeats)
This should obviously count from 0-9, but for some reason it adds 3 when it gets to 5??
http://datasheets.maxim-ic.com/en/ds/DS3234.pdf
Interestingly, the 10's seconds does a similar thing. It counts 00,10,20,00,10,20,00,10,20.... Never gets to 30,40,50... It's like I'm missing a bit! |
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Posted: Feb 29, 2012 - 11:52 PM |
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Joined: Feb 09, 2012
Posts: 223
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