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Paper 2 - Computer Science > Registers > Flashcards

Flashcards in Registers Deck (6)
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1

What is the role of the accumulator?

The special register used as temporary storage by the ALU

2

What is the role of the SR?

Used to hold the status of various flags indicating
-a positive/negative result
-carry bit used
-overflow error
-interrupt status

3

What is the role of the PC?

Register that holds the address of the next instruction to be fetched

4

What is the role of the MAR?

Holds the address of the next instruction to be fetched

5

What is the role of the MBR?

Holds the instruction from the MAR and the associated data.

6

What is the role of the CIR?

Used to store the instruction that is to be decoded and executed.