 Real-time Timer (RTT) | The Real-time Timer is built around a 32-bit counter used to count roll-over events of the programmable 16-bit prescaler, which enables counting elapsed seconds from a 32 kHz slow clock source |
| Power Management Controller (PMC) | |
| Supply Controller (SUPC) | Driver for the SUPC (Supply Controller) |
| Peripheral Parallel Input/Output (PIO) Controller | |
 MPU - Memory Protect Unit | |
  MMU Initialization | |
| Compiler abstraction layer and code utilities | Compiler abstraction layer and code utilities for AT91SAM |
| Preprocessor - Macro Repeat | |
| Preprocessor - Stringize | |
| Preprocessor - Token Paste | |
| 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 | |
| Power Manager (PM) | This is a stub on the SAM Power Manager Control (PMC) for the sleepmgr service |
| Common IOPORT API | See Quick start guide for the common IOPORT service |
| 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 |
| Busy-Wait Delay Routines | This module provides simple loop-based delay routines for those applications requiring a brief wait during execution |
| Sleep manager | The sleep manager is a service for ensuring that the device is not put to sleep in deeper sleep modes than the system (e.g., peripheral drivers, services or the application) allows at any given time |
| 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 |
1.8.5