The ATtiny series features a small package microcontroller with a limited peripheral set available. Main article: ATtiny microcontroller comparison chart Flash size The AVR is a modified Harvard architecture machine, where program and data are stored in separate physical memory systems that appear in different address spaces, but having the ability to read data items from program memory using special instructions.ĪVRs are generally classified into following: The Arduino platform, developed for simple electronics projects, was released in 2005 and featured ATmega8 AVR microcontrollers. By 2003, Atmel had shipped 500 million AVR flash microcontrollers. The AVR 8-bit microcontroller architecture was introduced in 1997. The polarity of the RESET line was opposite (8051's having an active-high RESET, while the AVR has an active-low RESET), but other than that the pinout was identical. Īmong the first of the AVR line was the AT90S8515, which in a 40-pin DIP package has the same pinout as an 8051 microcontroller, including the external multiplexed address and data bus. The designers worked closely with compiler writers at IAR Systems to ensure that the AVR instruction set provided efficient compilation of high-level languages. When the technology was sold to Atmel from Nordic VLSI, the internal architecture was further developed by Bogen and Wollan at Atmel Norway, a subsidiary of Atmel. It was known as a μRISC (Micro RISC) and was available as silicon IP/building block from Nordic VLSI. The original AVR MCU was developed at a local ASIC house in Trondheim, Norway, called Nordic VLSI at the time, now Nordic Semiconductor, where Bogen and Wollan were working as students. Note that the use of "AVR" in this article generally refers to the 8-bit RISC line of Atmel AVR microcontrollers. However, it is commonly accepted that AVR stands for Alf and Vegard's RISC processor. The creators of the AVR give no definitive answer as to what the term "AVR" stands for. Ītmel says that the name AVR is not an acronym and does not stand for anything in particular. The AVR architecture was conceived by two students at the Norwegian Institute of Technology (NTH), Alf-Egil Bogen and Vegard Wollan.
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