Any symbol followed by @word will be replaced by the symbol's value
shifted right by 2. This is used in situations such as loading a register
with the address of a function (or any other code fragment). For example, if
you want to load a register with the location of the function main then
jump to that function, you could do it as follows:
ldi r2, main@word
jmp r2
The text of the Arduino reference is licensed under a Creative Commons Attribution-ShareAlike 3.0 License. Code samples in the reference are released into the public domain.