hi,

So can anyone tell how can I do this using serial interrupt?

Indeed, just sit down, open a book about C-programming, Keil guide and 8051 datasheet and do it!

If be serious, could you explain your problem, please? Could you show us the code which does not work for you? Could you ask more specific question(s) about details you do not understand? And then we try to help. As for now it is just "gimme code", that`s sadly. If you need examples then just look at ones from Keil, search here over the forum or Internet.

Thanks,
Oleg