At 10:35 21.03.2006 +0100, you wrote: >ERROR: >!E C:\AVR_ICC7_Projekte\Steuerung\tcps.c(1527): undeclared identifier >`devUsartAvr1' Looks like a problem with the compiler macro definitions when using ICCAVR. As a work around you may add __AVR_ENHANCED__ to the compiler's macro defines. Harald