In processor design, Microcode is a technique that interposes a layer of computer organization between the CPU hardware and the programmer-visible instruction set architecture of the computer.

What is meant by microprogramming?

microprogramming, process of writing microcode for a microprocessor. Microcode is low-level code that defines how a microprocessor should function when it executes machine-language instructions. Typically, one machine-language instruction translates into several microcode instructions.

Where is microprogramming used?

Commercial machine - In this mode of usage, microprogramming is used to implement a standard computer family instruction set. There is no access to microcode by the user, but the control store is designed to be writable so that the manufacturer can make changes in the microcode.