Summary: Microprogramming is a technique to implement the control logic necessary to execute instructions within a processor. It is based on the general idea of fetching low-level microinstructions from a control store and deriving the appropriate control signals to be active for a single clock cycle, as well as microprogram sequencing information, from each microinstruction. Although hybrid techniques are now common, microprogramming is generally contrasted with hardwired implementation techniques.
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https://people.computing.clemson.edu/~mark/uprog.html
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