Info Catalog
as: AVR Syntax
as: AVR-Regs
9.5.2.1 Special Characters
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The presence of a ';' anywhere on a line indicates the start of a
comment that extends to the end of that line.
If a '#' appears as the first character of a line, the whole line is
treated as a comment, but in this case the line can also be a logical
line number directive (
Comments) or a preprocessor control
command (Preprocessing).
The '$' character can be used instead of a newline to separate
statements.