The ASF is included in Atmel Studio 6 ( A separate package is available for megaavr, AVR XMEGA, AVR UC3 and SAM users for IAR, Atmel AVR Studio 4 and AVR32 Studio on Atmel Studio users do not need this package as the ASF is integrated in Atmel Studio. It can easily integrate into an operating system (OS) or run as a stand-alone product. It has been designed to help develop and glue together the different components of a software design. 1 ASF: Release ASF-3.34 The Atmel Software Framework (ASF, is a compilation of embedded software for Atmel flash MCUs: megaavr, AVR XMEGA, AVR UC3 and SAM devices.