 USB device descriptors for a single interface | The following structures provide the USB device descriptors required for USB Device with a single interface DFU Atmel Class |
| External oscillator frequency detection | A software service to estimate an oscillator frequency using a known oscillator (external or internal) as a reference |
 Clock Management | |
 DFLL Management | A Digital Frequency Locked Loop can be used to generate a highly accurate frequency from a slower-running reference clock, in much the same way as a PLL |
| 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 (UC3L) |
  System Clock internals | |
| FLASHCDW - FLASH Controller Double-Word | FLASHCDW interfaces a flash block with the 32-bit internal HSB bus |
| 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 | |
| CPU - PM - Power Manager | The Power Manager (PM) provides synchronous clocks to the CPU and the modules and peripherals connected to the HSB and PBx buses |
| Power Clocks Library | |
| Power Manager (PM) | This is a stub on the AVR UC3 Power Manager(PM) for the sleepmgr service |
| CPU - SCIF - System Control Interface | Driver for the SCIF (System Control Interface) |
| 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 |
| USBC Device Driver | USBC 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 Device Firmware Upgrade Atmel specific | The DFU from Atmel is based on DFU specification, but does not implement same protocol |
| Interface with USB Device Core (UDC) | Structures and functions required by UDC |
| Implementation of UDI DFU Atmel Class | Class internal implementation |
| USB interface descriptors | The following structures provide predefined USB interface descriptors |
| USBC OTG Driver | USBC 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 |
| USB Device Firmware Upgrade (DFU) | Protocol definitions |
| In System Programming API | |
| In System Programming UC3 implementation | This implementation links the UC3 NVM functions to the common isp API |
| Boot Process definition for UC3 parts | The behavior of the UC3 boot process for bootloader is defined by the fuses values and two Words in the user page |
| Atmel FLIP Protocol definitions | To perform firmware upgrade, Atmel has developed an application called "FLIP" This software is a flexible application which lets you program and configure Atmel's microcontroller devices in their final environment without needing any dedicated hardware |
| Protocol versions | |
| Definitions for FLIP Protocol version 1 | Note: Used by Mega parts |
| Definitions for Atmel FLIP Protocol version 2 | Note: Used by uc3 and Xmega parts |
| Generic board support | The generic board support module includes board-specific definitions and function prototypes, such as the board initialization function |
| CPU - Cycle Counter | CPU Cycle Counter provides an interface to the COUNT and COMPARE registers |
| AST - Asynchronous Timer | Driver for the AST (Asynchronous Timer) |
| GPIO - General-Purpose Input/Output | GPIO gives access to the MCU pins |
1.8.5