Does anyone know with my problem??, I'm using PIC18F4550 to emulating RS-232 over USB, Now, sometime my system good working and sometime stop working. In the first minute is good working and on the 10 next minute the system is sometime stop working. I'm using recommended schematic on the http://pic18fusb.online.fr/wiki/wikka.php?wakka=WikiHome . Please help me.. And share your knowledge for me. thanks very much.. -- http://www.piclist.com PIC/SX FAQ & list archive View/change your membership options at http://mailman.mit.edu/mailman/listinfo/piclist