Yoo is a memory data register, also known as the abbreviation of data register and buffer register. It is a register in the computer control unit to register the data to be written into or read from the computer main memory. It is like a buffer, which holds the data copied from memory for the processor to use. Memory data register is half of the micro interface between microprogram and computer data storage, while the other half is memory address register.

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In the design of integrated circuits, registers can be divided into two categories: registers used inside circuits and registers used as internal and external interfaces. Internal registers cannot be accessed by external circuits or software, but can only be used to realize the storage function of internal circuits or meet the timing requirements of circuits. Interface registers can be accessed by both internal circuits and external circuits or software, and the registers in CPU are one of them. As an interface between software and hardware, it is well known to the general programming users.

There must be at least six types of registers in the CPU: instruction register (IR), program counter (PC), address register (AR), data register (DR), accumulation register (AC) and program status word register (PSW). These registers are used to temporarily store a computer word, and the number can be expanded as needed.