> register unsigned char counter asm ("r3")
Pointers live in register pairs, you must not specify an odd number.
However, I guess that specifying a GPR explicitly is not what you want?
You can find some examples on the following page.
The page is in german but the examples should give you some hints.
http://www.roboternetz.de/wissen/index.php/Inline-Assembler_in_avr-gcc#Zugriff_aufs_SRAM
regards
Georg-Johann
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