 CPU - Cycle Counter | CPU Cycle Counter provides an interface to the COUNT and COMPARE registers |
 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 | |
| SAU Driver | |
| MEMORY - MPU - Memory Protection Unit | MPU driver that allows the user to divide the memory space into different protection regions |
| GPIO - General-Purpose Input/Output | GPIO gives access to the MCU pins |
| INTC Software Driver API for AVR UC3 | This is a software module to register interrupt handlers at any specified interrupt level to any interrupt line managed by the INTC module in AVR UC3 devices |
| 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 |
| FLASHCDW - FLASH Controller Double-Word | FLASHCDW interfaces a flash block with the 32-bit internal HSB bus |
| CPU - SCIF - System Control Interface | Driver for the SCIF (System Control Interface) |
| USART Debug strings | This driver adds functionality to print debug strings and data through a dedicated USART |
| USART - Univ. Sync/Async Serial Rec/Trans | Driver for the USART (Universal Synchronous Asynchronous Receiver Transmitter) |
| 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 |
 System Clock Management | See Quick Start Guide for the System Clock Management service (UC3L) |
 System Clock internals | |
| Generic board support | The generic board support module includes board-specific definitions and function prototypes, such as the board initialization function |
1.8.5