Transcription of Instruction Sets: Characteristics and Functions Addressing ...
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Instruction Sets: Characteristics and Functions Addressing ...
Slides modified from multiple sources1. William Stallings Computer Organization and Architecture, Peckol, Embedded systems DesignCMPE 311 Instruction Sets: Characteristics and FunctionsAddressing ModesWhat is an Instruction Set? The complete collection of instructions that are understood by a CPU Machine Code Binary Usually represented by assembly codesElements of an Instruction Operation code (opcode) Do this: ADD, SUB, MPY, DIV, LOAD, STOR Source operand reference To this: (address of) argument of op, register, memory location Result operand reference Put the result here (as above) Next Instruction reference (often implicit) When you have done that, do this: BRExample: Simple Instruction Format(using two addresses) Instruction Cycle State DiagramDesign Decisions (1) Operation How many ops?
Elements of an Instruction •Operation code (opcode) –Do this: ADD, SUB, MPY, DIV, LOAD, STOR •Source operand reference –To this: (address of) argument of op, e.g. register, memory location •Result operand reference –Put the result here (as above) •Next instruction reference (often implicit) –When you have done that, do this: BR
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