I have read http://www.keil.com/forum/1854/how-to-use-extern-sbit-declare/
My problem is same. Using "extern sbit" works as mentioned in above post for small project.
My project has more then 10 files.
Now same solution do not work.
Vimal, I have some advice.
You should comment your code (NO code is truly self commenting).
The other bit of advice is space out your code, there is no prize for compactness of code that I am aware of other than this --> http://www.ioccc.org/
Thirdly there is < pre > < /pre > to place source into for people to read. Very helpful to the people trying to help you.
Happy coding!
Stephen