>Yes, right, but that seems to be no problem since I >found to have an edge in every block of 8 bits. This fact is normally used to lock the regenerated receive clock to the data rate (which it seems you have already worked out), and so you could probably look at some scheme for seeing what your interrupt timing is relative to the clock edge, and adjust accordingly. -- http://www.piclist.com PIC/SX FAQ & list archive View/change your membership options at http://mailman.mit.edu/mailman/listinfo/piclist