My stack usage is 8 deep (6 main 2 Interrupt). But when I write to internal EEProm My RX Interrupt stop receiving date from outside. It does not happen all the time Just once in a while. Where can I start to look for the fault. Cheers Johan Pretorius (083) 6506752 (Cell) (011) 7732423 (Phone) (011) 7732184 (Fax) -- http://www.piclist.com hint: The PICList is archived three different ways. See http://www.piclist.com/#archives for details.