The AVR RISC microcontroller family is made by Atmel Corp. It uses a RISC core running single cycle instructions, and a well defined I/O structure that limits need for external components. Some features in AVR devices: internal oscillators, timers, UART, SPI, pull-up resistors, pulse width modulation, ADC, analog comparator, watch-dog timers. The architecture was created at the Norwegian Institute of Technology (NTH), by two students: Alf-Egil Bogen, Vegard Wollan, and developed further at Atmel Norway AS, a subsidiary founded by them. The chip is supported by Atmel, and by a vibrant, large, and growing user community, which provides free projects, software, tutorials, and much other assistance.
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Growing article, with links to many related topics. [Wikipedia]
The AVR Assembler Site
Descriptions, tutorials, many code samples: application notes with commented source code.
AVR Butterfly and Beginners Site
The Butterfly is a credit-card sized demo board from Atmel Corp. It is feature-dense and low cost. Descriptions, tutorials, forum, block diagram, primer, many code samples: application notes with commented source code.
News in Weblog format, links, forum, tutorials, articles, specifications; devices, tools, projects, vendors. Some areas need registration.
Goal: high quality C library to use with GCC on Atmel AVR microcontrollers. Together, avr-binutils, avr-gcc, and avr-libc are the core of the open source toolchain for AVR.
AVR Microcontroller Projects
Many projects, tutorials; tools, book list, photo gallery, links.
Introduces assembly programming language for Atmel AVR processors (AT90S) with practical examples. English, Deutsch.
Dick Cappels' Project Pages
Many projects using microcontrollers (AVR, ATMega8, ATmega163, ATtiny12, ATtiny2313, AT90S1200A, AT90S2313, AT90S8515/ATMEGA8515), analog, RF, and all 3 mixed; much free information.
ECE476 Final Projects
Many electrical engineering student projects, using Atmel ATmega32 AVR chips. Cornell University.
HP InfoTech S.R.L.
Makes CodeVisionAVR C compiler, integrated development environment (IDE), automatic program generator, ChipBlasterAVR in-system programmer, code wizard, for Atmel AVR processors. [commercial]
Linux Development Tools for Atmel AVR
Tool chain development for AVR on Linux: programmer hardware, Linux driver, AVRASM-compatible assembler/linker, debugger, simulator. Theiling Online.
Makes BASCOM AVR/8051 Windows BASIC compiler, educational development board, with tutorials, forum; other embedded electronic systems.
AVR tutorials, projects, links; and other science, embedded, biomedical engineering, physics content.
Set of links to websites on Atmel AVR microcontrollers, related projects.
Suite of executable software development tools for Atmel AVR RISC processors, hosted on the Windows platform, has GNU GCC compiler for C/C++. Open source.