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Are micro instructions low level assembly language or are micro instructions binary digits such as 1 or 0 that the computer uses to process things at very low level? Whenever I try to search up for micro instructions, I am unable to find much info.

mweotwo
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  • With the term "micro instructions", do you really mean [*microcode*](https://en.wikipedia.org/wiki/Microcode)? – Some programmer dude Aug 21 '20 at 03:41
  • What context did you see this term used in? Possibly talking about Intel or AMD micro-*ops*, aka uops or μops? http://www.lighterra.com/papers/modernmicroprocessors/ for an overview of CPU architecture. Also maybe https://www.realworldtech.com/sandy-bridge/. https://agner.org/optimize/. https://www.realworldtech.com/risc-vs-cisc/ for an intro to how PPro first started decoding x86 code to uops. Or in the context of much older micro-coded CPUs like Z80, the CPU ran machine instructions with multiple internal microcode instructions that were known to some degree. – Peter Cordes Aug 21 '20 at 03:57
  • [What is a microcoded instruction?](https://stackoverflow.com/q/40366643) for that modern meaning of microcode, and multi-uop vs. single uop x86 instructions. Also [What exactly is microcode and how does it differ from firmware?](https://superuser.com/q/1283788) for stuff like 6502 microcode. Or [How was microcode implemented in retro processors?](https://retrocomputing.stackexchange.com/q/6656) – Peter Cordes Aug 21 '20 at 04:09

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A single instruction in microcode. The most basic instruction in the computer, like moving the contents of a register to the ALU.

We need several micro-instructions to run complex machine instruction

NadavWeisler
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