What is Registers?

                                        Register

A register is small set of data holding places that are part of computer processor. It is used to store data and instructions temporary inside the processing unit.

  A register can hold

1.  Data                                                                         
   
2. Instructions
3. Storage Address

It directly manipulate to control unit. Different processors have different numbers and types of registers. A register must be large enough to hold an information. Registers size in bits and bytes and wired for specific function.

      It performs three basic operations.

• Fetch

           The fetch operation is used for taking instructions from user or stored into main memory will be fetch by using registers.

• Decode

          The decode operation is used for interpreting the instructions means the instruction are decoded.

• Execute

         The execute operation is performed by processing unit. 

 Categories of Registers 

• General purpose register
• Segment Register
• Index Register
• Special purpose Register
• Pointer Register
• Flag Register