 Standard I/O (stdio) | Common standard I/O driver that implements the stdio read and write functions on AVR and SAM devices |
  Standard serial I/O (stdio) | Common standard serial I/O management driver that implements a stdio serial interface on AVR and SAM devices |
 USB device descriptors for a single interface | The following structures provide the USB device descriptors required for USB Device with a single interface CDC |
| Test Suite Framework | This module is the test suite framework, which provides a set of standard functions and macros for defining and running test suites |
| Compiler abstraction layer and code utilities | Compiler abstraction layer and code utilities for 32-bit AVR |
| Preprocessor - Macro Repeat | |
| Preprocessor - Stringize | |
| Preprocessor - Token Paste | |
| Status Codes | |
| Atmel part identification macros | This collection of macros identify which series and families that the various Atmel parts belong to |
| AVR UC3 parts | |
| AVR XMEGA parts | |
| megaAVR parts | |
| SAM parts | |
| Global interrupt management | This is a driver for global enabling and disabling of interrupts |
| Deprecated interrupt definitions | |
| Clock Management | |
| Generic Clock Management | Generic clocks are configurable clocks which run outside the system clock domain |
| Oscillator Management | This group contains functions and definitions related to configuring and enabling/disabling on-chip oscillators |
| PLL Management | This group contains functions and definitions related to configuring and enabling/disabling on-chip PLLs |
 System Clock Management | See Quick Start Guide for the System Clock Management service (UC3A0/UC3A1) |
 System Clock internals | |
| MEMORY - FLASHC - Flash Controller | FLASHC interfaces a flash block with the 32-bit internal HSB bus |
| Serial Interface (Serial) | See Quick start guide for Serial Interface service |
| USART - Univ. Sync/Async Serial Rec/Trans | Driver for the USART (Universal Synchronous Asynchronous Receiver Transmitter) |
| Sleep manager | The sleep manager is a service for ensuring that the device is not put to sleep in deeper sleep modes than the system (e.g., peripheral drivers, services or the application) allows at any given time |
| CPU - PM - Power Manager | The Power Manager (PM) controls the oscillators and PLLs, and generates the clocks and resets in the device |
| Power Clocks Library | |
| Power Manager (PM) | This is a stub on the AVR UC3 Power Manager(PM) for the sleepmgr service |
| USB Stack | This stack includes the USB Device Stack, USB Host Stack and common definitions |
| USB Stack Device | This module includes USB Stack Device implementation |
| USB Device Controller (UDC) | The UDC provides a high-level abstraction of the usb device |
| Implementation of UDC | Internal implementation |
| USB Device Controller (UDC) - Prerequisites | Common prerequisites for all USB devices |
| USB Device Controller (UDC) - Example code | Common example code for all USB devices |
| USB Device Controller (UDC) - Workflow | Common workflow for all USB devices |
| USB Device Descriptor | |
| USB Device Driver (UDD) | The UDD driver provides a low-level abstraction of the device controller hardware |
| USBB Device Driver | USBB low-level driver for USB device mode |
| USB Device Interface (UDI) | The UDI provides a common API for all classes, and this is used by UDC for the main control of USB Device interface |
| USB Device Interface (UDI) for Communication Class Device (CDC) | Common APIs used by high level application to use this USB class |
| Interface with USB Device Core (UDC) | Structures and functions required by UDC |
| Implementation of UDI CDC | Class internal implementation |
| USB interface descriptors | The following structures provide predefined USB interface descriptors |
| USBB OTG Driver | USBB low-level driver for OTG features |
| Atmel USB Identifiers | This module defines Atmel PID and VIDs constants |
| USB Protocol Definitions | This module defines constants and data structures provided by the USB 2.0 specification |
| Communication Device Class Definitions | |
| Generic board support | The generic board support module includes board-specific definitions and function prototypes, such as the board initialization function |
| GPIO - General-Purpose Input/Output | GPIO gives access to the MCU pins |
1.8.5