special purpose registers

Replies

• 

  vinci

  PC-Program counter ,points the next storage location(like pointers but not these are pointers)
  but I forgot the rest .you may take help of other CEians here
• 

  Neeraj Sharma

  IR (Instruction Register) : is responsible for storing the instruction that is currently under execution.
  
  PC (Program Counter) : is responsible for storing the address of the next instruction to be fetched.
  
  MAR (Memory Address Register) : is responsible for storing the memory location of data. When the data is to be read by the program, it is fetched from MAR to memory data register and when data is to be written then the data is written from memory data register to MAR
  
  I think its MDR not MBR. MDR explanation can be understood from the explanation of MBR above.
• 

  aarthivg

  Nick_Sharma

  I think its MDR not MBR. MDR explanation can be understood from the explanation of MBR above.

  #-Link-Snipped-#, I am sure, its MBR ONLY.
  
  

  Nick_Sharma

  MDR explanation can be understood from the explanation of MBR above.

  cant get you
• 

  Neeraj Sharma

  Hmmm Okay.I don't know what's MBR then.. May be someone else could answer
• 

  coolboy.napster

  A Memory Buffer Register (MBR) is the register in a computer's processor, or central processing unit, CPU, that stores the data being
  transferred to and from the
  immediate access store. It
  acts as a buffer allowing the processor and memory units to act independently
  without being affected by
  minor differences in
  operation. A data item will
  be copied to the MBR ready
  for use at the next clock cycle, when it can be either
  used by the processor or
  stored in main memory. This register holds the
  contents of the memory
  which are to be transferred
  from memory to other
  components or vice versa. A word to be stored must be transferred to the 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 is processed in the
  ALU.