David rob wrote:
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can you tell me how i could use timer interrupt in c program


No I cannot, I could tell you how to do it in assembler.

For C you will have to C (see) someone else...;-)

Look around on the internet, check (I mean read) your compiler manuals, check the website from compiler vendors , check the application notes from chip vendors. I am sure you can come up with some decent examples written in C...

regards
patrick