Instruction Set Architecture
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Instruction Set Architecture |
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The microarchitecture is all about how the internal circuitry of the processor is laid out, but Instruction set architecture is the set of instructions that the circuitry will "understand". The Instruction Set Architecture will include specification of the data type sizes, instructions, addressing modes, interrupts, etc. and will include the specification of the OP Codes the processor will interpret.
Computers can share a instruction set, but have it implemented with different microarchitectures. For example, the Intel Pentium and the AMD Athlon implement nearly identical versions of the x86 instruction set, but have radically different internal designs.
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