IAR for AVR is ATMEL' s AVR recommended development environment, its code is more efficient than GCC and ICC to compile a 25 to 50 , so very popular, but very little relevant information, I would upload the information that can quickly get started (including the expansion of IAR keyword, GCC AVR code for how to migrate to IAR, etc.)

EWAVR_4.10中文用户手册.pdf
IAR-AVR+C编译器指南.pdf
从WinAVR到IAR快速移植.pdf

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