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 |
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 |
XMEGA compiler driver | Compiler abstraction layer and code utilities for 8-bit AVR |
 Assembler Support | This group provides a good handful of macros intended to smooth out the differences between various assemblers, similar to what compiler.h does for compilers, except that assemblers tend to be much less standardized than compilers |
 Macro Repeat | |
 Stringize | |
 Token Paste | |
 Program memory | |
 Status Codes | |
Global interrupt management | This is a driver for global enabling and disabling of interrupts |
 Deprecated interrupt definitions | |
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 | |
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 (XMEGA) |
Configuration Change Protection | See Quick start guide for CCP driver |
XMEGA reset cause | See reset_cause_quickstart |
Serial Interface (Serial) | See Quick start guide for Serial Interface service |
USART module (USART) | See Quick start guide for USART module |
Programmable Multilevel Interrupt Controller | See Quick start guide for PMIC driver |
Common IOPORT API | See Quick start guide for the common IOPORT service |
Calendar service | See Quick start guide for Calendar service |
Generic board support | The generic board support module includes board-specific definitions and function prototypes, such as the board initialization function |
General Purpose Input/Output | This is the common API for GPIO |