Macro instruction an instruction stored in RAM. These instructions form the user's programs
example ADD Ax,Bx
It may be executed in many number of cycle
Micro instruction is a simple command that makes the hardware operate properly. The format is unique to each computer, detailed low-level instructions used in some designs to implement one Macro instruction example T0: IR<--- PC
It executed in only one clock cycle
difference between micro operation and microinstruction
A microinstruction executing system includes a sequencer for controlling sequential readout of microinstructions from a ROM for storage in a microinstruction register and for subsequent decoding by a decoder.
It is a memory register inside the CPU. The function is to hold the current microinstruction. The microinstruction is the bits that drive the control signal and drive the data path.
In a microprogrammed processor, the hardware doesn't directly execute the instructions in the ISA  The hardware executes very simple micro-operations that are used to implement the instructions  Each instruction specifies a sequence of micro-operations that are used to implement the instructions
difference between as on and as at
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Difference between paging and what?
just difference
In computer architecture and engineering, a sequencer or microsequencer is a part of the control unit of a CPU. It generates the addresses used to step through themicroprogram of a control store.Usually the addresses are generated by some combination of a counter, a field from a microinstruction, and some subset of the instruction register. A counter is used for the typical case, that the next microinstruction is the one to execute. A field from the microinstruction is used for jumps, or other logic.Since CPUs implement an instruction set, it's very useful to be able to decode the instruction's bits directly into the sequencer, to select a set of microinstructions to perform a CPU's instructions.Most modern CPUs are considerably more complex than this description suggests. They tend to have multiple cooperating micromachines with specialized logic to detect and handle interference between the micromachines.
difference between enterprise and corporation
The difference between a shogun and a samurai is like the difference between a king and a knight.