Long ago I had a CRC which was one clock out from where I thought it should gbe. I can't remember the detail or why we disagreed but adding or removing the one cycle made the difference. Presumably it made sense at the time :-). Russell --=20 http://www.piclist.com PIC/SX FAQ & list archive View/change your membership options at http://mailman.mit.edu/mailman/listinfo/piclist .