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AVR microcontrollers are used numerously as [[embedded system]]s. They are especially common in hobbyist and educational embedded applications, popularized by their inclusion in many of the [[Arduino]] line of open hardware development boards.
The AVR 8-bit microcontroller architecture was introduced in 1997. By 2003, Atmel had shipped 500 million AVR flash microcontrollers.<ref>Atmel press release. [http://www.prnewswire.com/news-releases/atmels-avr-microcontroller-ships-500-million-units-72278687.html "Atmel's AVR Microcontroller Ships 500 Million Units"].</ref>
== History ==
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Among the first of the AVR line was the AT90S8515, which in a 40-pin DIP package has the same pinout as an [[Intel 8051|8051]] microcontroller, including the external multiplexed address and data bus. The polarity of the <span style="text-decoration: overline">RESET</span> line was opposite (8051's having an active-high RESET, while the AVR has an active-low <span style="text-decoration: overline">RESET</span>), but other than that the pinout was identical.
== Device overview ==
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