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interface ds1307 with at89s51

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Noman Yousaf

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hi
i m trying to interface DS1307 with AT89S51
but the problem is, i successfully write the time in RTC but fail to read.
i checked on proteus.
i use this protocol for reading

start (release start bit)
device add. (send device add. #0D0h)
get byte (send clock only and get data fomr RTC)
stop (release stop bit)

actually i want to know about acknowledge bit. how to release acknowledge bit from master.
in this way i have to get at least seconds.
but even in this condition i cant read seconds

plz guide

thanks in advance

regards
 

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