 Generic board support | The generic board support module includes board-specific definitions and function prototypes, such as the board initialization function |
 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 | |
| GPIO - General-Purpose Input/Output | GPIO gives access to the MCU pins |
| USB Stack | This stack includes the USB Device Stack, USB Host Stack and common definitions |
| 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 Human Interface Device (HID) | Protocol definitions |
| USBB OTG Driver | USBB low-level driver for OTG features |
| 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 (UC3A3/UC3A4) |
 System Clock internals | |
| MEMORY - FLASHC - Flash Controller | FLASHC interfaces a flash block with the 32-bit internal HSB bus |
| USBB Device Driver | USBB low-level driver for USB device mode |
| USBB Host Driver | USBB low-level driver for USB host mode |
| Busy-Wait Delay Routines | This module provides simple loop-based delay routines for those applications requiring a brief wait during execution |
| CPU - Cycle Counter | CPU Cycle Counter provides an interface to the COUNT and COMPARE registers |
1.8.5