In summary, ASF is high-quality software library with drivers, communication stacks and common services. The Atmel Software Framework now supports both AVR and ARM processor-based microcontrollers from Microchip. It is built and maintained by experienced Microchip engineers for evaluation and prototyping as well as production use. As a result, the user can safely ship products that make use of ASF in the final version. And everything is downloadable free of charge.