#define ARCH_AVR8           0\r
 \r
                        /** Selects the Atmel 32-bit UC3 AVR (AT32UC3* chips) architecture. */\r
-                       #define ARCH_UC3           1\r
+                       #define ARCH_UC3            1\r
+                       \r
+                       /** Selects the Atmel XMEGA AVR (ATXMEGA*U chips) architecture. */\r
+                       #define ARCH_XMEGA          2\r
                        \r
                        #if !defined(__DOXYGEN__)\r
                                #define ARCH_           ARCH_AVR8\r