rtc interfacing

hai friends,
please send me the schematic and c code to inteface the 12c887 rtc with at89c51ed2 mcu, waiting in anticipation

I think one thread is already open for this discussion. Please do not make duplicate posts..
and make a schematic yourself i have also given you the pin configuration, if there is any error in the schematic i will help you correcting it.
and as it is memory mapped so you can simply read and write as you write in a memory location. first you finish your schematic then i will help you.

Note: Please do not create duplicate posts. If you have already opened a discussion with similar topic, its better to continue in the same thread Try not to mess up the forum.
Thanks!
Rickey's World

Do you have assembly code for that?

i said.. write the code if you get error i will help you removing it why you all want ready made things

sir, Thank you for your replies,
I have already tried the circuit for dispalying the time on hyperterminal. I am getting the time which is not updating, for the first time i run the project i am getting whatever the time i have set without updating. if i switch off and on the controller i get another time which is still not updating. Even after i remove the rtc (i.e., po) iam still getting the un-updated time, in this case there is no connection between the rtc registers and the microcontroller. what could be wrong?

no.. it could be cause.. you did not activate the oscillator. so clock is kind of halted.
see page 11 for more information on turning the oscillator on. :-)

please refer "The 8051 microcontroller and Embedded System" By Mazidi." it has a very good tutorial for interface with 12c887 RTC
i have make a project using this with asm and working fine

note: before using the RTC u must enable the internal osc by proper configuration

I told him to read page 11 and after that i am sure he will get the output.. coz he already made everything just for got to enable oscillator

sir, I have enabled the oscillator, and used the attached code to read the initialized data and the updated clock. I am not getting the updated time. plz help me to debug.

then post your work so that we can help u to find out the problem