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What is Memory Register in Computer and Type of registers

As the CPU interprets and executes instructions, information is transferred between various units of the computer system. To facilitate this transfer, the computer uses a number of special memory units called register. These register are able to receive information, hold them temporarily and pass them on as directed by the control unit. An 8-bit register can store 8 bits. Registers are classified on the basis of functions as under;

what are the types of computer memory,computer memory units

 

1. Memory address Register (MAR)

2. Memory Buffer Register (MBR)

3. Program Counter Register (PCR)

4. Accumulator Register

5. Instruction Register (IR)

6. Input/output Register (I/O)

 

1. Memory address Register (MAR)

At any time of time, it holds the address of the memory location, currently active. 

2. Memory Buffer Register (MBR)

This register holds the contents of the memory word read form or written in. A word to be stored in a memory location is first transferred to the MBR, from where it is written in memory. An instruction word placed in this register is transferred to the instruction register. A data word placed in this register is accessible with the accumulate register or for transfer to the I/O register.

3. Program Counter Register (PCR)

Program Counter Register it holds the address of next instruction to be executed and caused the computer to read successive instruction previously stored in memory. To read an instruction, the contents of the PC register are transferred to the MAR and a memory read cycle in initiated. The instruction placed in the MBR is then transferred to the instruction register. 

4. Accumulator Register

Accumulator Register it holds the initial data, intermediate result and also the final results of processing operations. The results of arithmetic operations are returned to the accumulator register for transfer to main storage MBR. 

5. Instruction Register (IR)

Instruction Register, this register holds the current instruction that is being executed. Each instruction has to parts - operation part and address part. When an instruction is stored in the instruction register, the part of the instruction is sent to the MAR, while its operation part is sent to the control section where it is decoded, interpreted and ultimately command signals are generated to carry out the task specified by the instruction.

6. Input/output Register (I/O)

Input information such as instruction and data are transferred to this register. Also, all information to be transferred to an output device is found in this register.

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