Question

what are controlled buffer register?

Answer 1

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$\mathfrak{\blue{Answer.}}$A memory buffer register(MBR) or memory dataregister (MDR) is the registerin a computer's processor, or central processing unit, CPU, that stores the data being transferred to and from the immediate access storage. It contains the copy of designated memory locations specified by the memory addressregister.
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Answer 2

The register holds the contents of the memory which are to be transferred from the memory to other components and vice versa .A word to be stored must be transferred to MBR,from where it goes to the specific memory location,and the arithmetic data to be processed in the ALU first goes to MBR,and then to accumulated register,and then it processed in the ALU.