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Fetch-Execute Cycle (cont)

Executing an instruction involves
  • determine what the operator is
  • determine which registers, if any, are involved
  • determine which memory location, if any, is involved
  • carry out the operation with the relevant operands
  • store result, if any, in appropriate register
Example instruction encodings (not from a real machine):

[Diagram:Pics/processor/instructions.png]