I2C codes not working on ds89c450

Clearly, your code is relying upon something in the 89c61x2 that is not (quite) the same as the ds89c450.

That could be something fundamental, or it could be that your 89c61x2 version is marginal and gets just that little bit worse on the ds89c450...

You have the code; you have the hardware you need to look at the differences between your two systems - you haven't given any detail at all that would enable anyone else to do so!

For a start, have you checked waveforms with an oscilloscope?

Clearly, your code is relying upon something in the 89c61x2 that is not (quite) the same as the ds89c450.

That could be something fundamental, or it could be that your 89c61x2 version is marginal and gets just that little bit worse on the ds89c450...

You have the code; you have the hardware you need to look at the differences between your two systems - you haven't given any detail at all that would enable anyone else to do so!

For a start, have you checked waveforms with an oscilloscope?

HI Andy,
The codes i'm talking about are the standard I2C codes used for RTC ds1307. The main difference i figured out is the speed of execution. The ds89c450 is much more faster than the philips microcontroller. I tried increasing the delays to overcome the problem but no success. Is there anything i can do about that?

Don't just "try" stuff - think it out!

Have you looked at the waveforms on an oscilloscope yet?

yes there is some activity on the SDA and SCL pins.it means that the i2c routines are working, isn't it?

"it means that the i2c routines are working, isn't it?"

It means that they are doing something - but are they doing the right thing?!

In particular, is the timing correct?

i checked the waveform and i found out that the start was not proper, so i changed the code and now my RTC is working but i'm getting corrupted data. The seconds are coming like this.

i initialized the sec to 00h

00 00 00 00 00 01 01 01 01 01 00 00 00 00 00 01 01 01 01 06 06 06 06 06 07 07 07 07 07 06 06 06 06 06 07 07 07 07 07 00 00 00 00 01 01 01 01 01 18 18 18 18 18 19 19 19 19 19 18 18 18 18 19 19 19 19 19 1E 1E 1E 1E 1E 1F 1F 1F 1F 1F 1E 1E 1E 1E 1E 1F 1F 1F 1F 18 18 18 18 18 19 19 19 19 19 00 00 00 00 00 01 01 01 01

the problem is in the 1st and 5th bit.

could you tell me what i can do about it?

No one ever got this kind of problem before???

so i changed the code and now

Earlier you claimed that code was "the standard code", now you say you had to change it to make it work. So you're contradicting yourself. That, along with the fact you haven't showed a shred of actual code so far, makes it near impossible to help.