I very frequently do simultaneous transmission and reception on 18 series PICs at 250kbps. My current project is doing simultaneous transmission and reception of 250kbps through an external parallel interface uart and then 500kbps throught the PIC uart to a Silicon Labs serial to USB chip. So, it can be done! Harold -- FCC Rules Updated Daily at http://www.hallikainen.com -- http://www.piclist.com PIC/SX FAQ & list archive View/change your membership options at http://mailman.mit.edu/mailman/listinfo/piclist