Erik, thank you for the response. I have inserted the "using 1" line code in the ISR. But still does not do anything. What about if "using 1" has been used for different ISR. could I use it again? could I use "using 2" instead...in other words how many times can I use the same register in ISR's. Also, I have noticed the TF0 bit does not get set after overflowing...therefore, ISR is not executed. Why?
What do you mean by have I looked in my emulator?
Thank you!