Binary Instruction Coding

What the b machine sees:

What we prefer to write:

ADD(ra, rb, rc)

rc <ra> + <rb>

“Add the contents of ra to the contents

of rb and store the result in rc”.

Register

Transfer

Notation

symbolic

machine

language*

OPCODE

rc

ra

rb

unused

6

5

5

5

11

* also called symbolic assembly language

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