-       /* Private Interface - For use in library only: */\r
-       #if !defined(__DOXYGEN__)\r
-               /* Macros: */\r
-                       #if ((defined(__AVR_AT90USB1286__) || defined(__AVR_AT90USB646__) ||   \\r
-                             defined(__AVR_AT90USB162__)  || defined(__AVR_AT90USB82__)  ||   \\r
-                                 defined(__AVR_ATmega16U4__)  || defined(__AVR_ATmega32U4__) ||   \\r
-                                 defined(__AVR_ATmega32U6__)) && !defined(USB_DEVICE_ONLY))\r
-                               #define USB_DEVICE_ONLY\r
-                       #endif\r
-                       \r
-                       #if (defined(__AVR_AT90USB162__)  || defined(__AVR_AT90USB82__))\r
-                               #define USB_LIMITED_CONTROLLER\r
-                       #elif (defined(__AVR_ATmega16U4__) || defined(__AVR_ATmega32U4__))\r
-                               #define USB_MODIFIED_FULL_CONTROLLER\r
-                       #else\r
-                               #define USB_FULL_CONTROLLER\r
+       /* Public Interface - May be used in end-application: */\r
+       #if defined(__DOXYGEN__)\r
+               /** Indicates that the target AVR microcontroller belongs to the Series 2 USB controller\r
+                *  (i.e. AT90USBXXX2 or ATMEGAXXU2) when defined.\r
+                */\r
+               #define USB_SERIES_2_AVR\r
+\r
+               /** Indicates that the target AVR microcontroller belongs to the Series 4 USB controller\r
+                *  (i.e. ATMEGAXXU4) when defined.\r
+                */\r
+               #define USB_SERIES_4_AVR\r
+\r
+               /** Indicates that the target AVR microcontroller belongs to the Series 6 USB controller\r
+                *  (i.e. AT90USBXXX6) when defined.\r
+                */\r
+               #define USB_SERIES_6_AVR\r
+\r
+               /** Indicates that the target AVR microcontroller belongs to the Series 7 USB controller\r
+                *  (i.e. AT90USBXXX7) when defined.\r
+                */\r
+               #define USB_SERIES_7_AVR\r
+\r
+               /** Indicates that the target AVR microcontroller and compilation settings allow for the\r
+                *  target to be configured in USB Device mode when defined.\r
+                */\r
+               #define USB_CAN_BE_DEVICE\r
+\r
+               /** Indicates that the target AVR microcontroller and compilation settings allow for the\r
+                *  target to be configured in USB Host mode when defined.\r
+                */\r
+               #define USB_CAN_BE_HOST\r
+\r
+               /** Indicates that the target AVR microcontroller and compilation settings allow for the\r
+                *  target to be configured in either USB Device or Host mode when defined.\r
+                */\r
+               #define USB_CAN_BE_BOTH\r
+       #else\r
+               /* Macros: */                   \r
+                       #if (defined(__AVR_AT90USB162__) || defined(__AVR_AT90USB82__)  || \\r
+                            defined(__AVR_ATmega32U2__) || defined(__AVR_ATmega16U2__) || defined(__AVR_ATmega8U2__))\r
+                               #define USB_SERIES_2_AVR\r
+                       #elif (defined(__AVR_ATmega32U4__) || defined(__AVR_ATmega16U4__))\r
+                               #define USB_SERIES_4_AVR\r
+                       #elif (defined(__AVR_ATmega32U6__) || defined(__AVR_AT90USB646__) || defined(__AVR_AT90USB1286__))\r
+                               #define USB_SERIES_6_AVR\r
+                       #elif (defined(__AVR_AT90USB647__) || defined(__AVR_AT90USB1287__))\r
+                               #define USB_SERIES_7_AVR\r