范例为ATMEL网站上的应用笔记AVR306，一个USART中断驱动程序。使用IAR3.20编译器软件，编译过不去，错误信息如下：
Changed settings forces a full rebuild...
Rebuilding configuration: rs232 - Debug
0 file(s) deleted.
USART2.c
iccavr.exe --cpu=m128 -ms -o C:Documents and Settingswensir桌面atmel网站串口中断 驱动DebugObj -y --initializers_in_flash
-z3 --no_cse --no_inline --no_code_motion --no_cross_call --no_clustering --debug -e -I C:Program FilesIAR SystemsEmbedded
Workbench Evaluation versionavrINC -I C:Program FilesIAR SystemsEmbedded Workbench Evaluation versionavrINC
CLIB --eeprom_size 4096 C:Documents and Settingswensir桌面atmel网站串口中断 驱动USART2.c
IAR Atmel AVR C/EC++ Compiler V3.20A/W32, Evaluation Version
Copyright 1996-2004 IAR Systems. All rights reserved.
Error[Pe020]: identifier "RXCIE0" is undefined
Error[Pe020]: identifier "RXEN0" is undefined
Error[Pe020]: identifier "TXEN0" is undefined
Error[Pe020]: identifier "USBS0" is undefined
Error[Pe020]: identifier "UCSZ01" is undefined
Error[Pe020]: identifier "UCSZ00" is undefined
Error[Pe020]: identifier "UDRIE0" is undefined
Error[Pe020]: identifier "UDRIE0" is undefined
Errors: 8
Warnings: none
Total number of errors: 8
Total number of warnings: 0
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