Hi,

What are you doing inside the basic routine ? If you are sure that you program is not taking much time for a single example then depending on the input baud rate / execution speed you can even handle the entire stuff in PBP. But if it needs to be fast then it is best to write in asm completely. Saving the PBP variables can be a little tricky if your code grows with future requirement. As you mentioned you are new to asm (so am I) give it a try and there are guys out here who can help. Keep the Faith