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Write programs for AVR microcontrollers. The tools supports several clock sources such as External Low Frequency Crystal, External Clock, Calibrated Internal RC Oscillator, etc.
AVR Studio is a great tool for developing applications for Atmel AVR microcontrollers. It has a lot of useful features, such as access to 400 example projects, user guides and datasheets, the Cycle Correct simulator, the ability to write code for several apps in split windows, and integration with Microsoft Visual Studio. I highly recommend it for anyone looking to develop applications for Atmel AVR microcontrollers.