my question is that i have a source code for 89C51 but this ic doesnot respond to the code. rather 89v51 responds to the code after burning it so can i know what changes can be made so that i can use 89C51.
1) 89C51 can be anything 89v51 can be a few different things, what are you using, BE SPECIFIC.
most likely your issue is that the 89v51 is running 6 clock and whatever 89C51 you have is running a different clock