 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 |
 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 | |
| AT45dbx DataFlash component driver. | This is a driver for the AT45dbX series DataFlash memories |
| Serial Peripheral Interface (SPI) | This is the common API for SPI interface |
| SPI - Serial Peripheral Interface | See Quick start guide for SPI driver on AVR32 devices |
| 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 (UC3B0/UC3B1) |
 System Clock internals | |
| MEMORY - FLASHC - Flash Controller | FLASHC interfaces a flash block with the 32-bit internal HSB bus |
| 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 |
| 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) |
| GPIO - General-Purpose Input/Output | GPIO gives access to the MCU pins |
1.8.5