how to transmit and receive the packets in serial communication by using interrupts by using at89c51 microcontroller
here we go again. have you considered the remote possibility that the processor's data sheet will tell you, or sample programs that can be found like mushrooms after rain all over the net?
at89c51ac3 data sheet http://www.keil.com/dd/docs/datashts/atmel/at89c51ac3.pdf
"the packets"
What packets?
As Tamir said, did it occur to you to look at the examples that are included with your Keil installation - and also available from this very site...?
i be thinked that he is telling us and he is not being a question
he be giving us the chaptar titel and he misst the detail?
Look in the samples folder the compiler installed