I have tried 3  I2C (in assembly) routines successfully programming 24C02-
24C16 eproms , to program RTC DS 1307 through a 16F877 /4Mz. I find that
all the routines  are inconsistent in writing and reading the RTC ( success
rate of 70%) while they successfully program the 24Cxx.

Perhaps this is due to  the fact that the datasheet of DS1307 says it works
only on 100 KHz I2C and not on 400KHz I2C . I am unable to get any
improvement in performance even by adding delays suggested by some sites
searched through Google.

Any advice for solving this problem is welcome.

Thanks in advance

Rajiv Thakur

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