arc assembly

Does anybody know any arc assembly(very basic assembly language)??
I understand all of it except for this one piece of code:

[red]ld [a], %r1, %r2[/red]
[red]st %r4, %r1, [c][/red]

whats the deal with the three operands, I thought load and store only took two operands(source and destination) what does that %r1 have to do with anything??

Thanks to anybody who replies,
CraZee FooL

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