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Central Processing Unit (CPU) - Registers

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Total cards: 12•Content version: v3•Public deck•Updated: 8/1/2026

Card preview (12)

#1
Front (Question)

What does PC stand for?

Back (Answer)

Program Counter

#2
Front (Question)

What does the PC do?

Back (Answer)

It is the address of the next instruction in memory

#3
Front (Question)

What does MAR stand for?

Back (Answer)

Memory Address Register

#4
Front (Question)

What does the MAR do?

Back (Answer)

Address of next instruction during fetch phase or can be the address to retrieve data from during execute phase

#5
Front (Question)

What does MDR stand for?

Back (Answer)

Memory Data Register

#6
Front (Question)

What is a register?

Back (Answer)

Areas of memory in the CPU

#7
Front (Question)

What does the MDR do?

Back (Answer)

Holds the current data that has been fetched from memory or is about to be stored in memory

#8
Front (Question)

What is another name for the MDR?

Back (Answer)

Memory Buffer Register

#9
Front (Question)

What does CIR stand for?

Back (Answer)

Current Instruction Register

#10
Front (Question)

What does the CIR do?

Back (Answer)

Holds instruction to be executed

#11
Front (Question)

What does ACC stand for?

Back (Answer)

Accumulator

#12
Front (Question)

What does the ACC do?

Back (Answer)

Holds the result of the current calculation