This register stores the instruction currently being executed

CIR - Current Instruction Register

Which of these is correct?

The MDR stores the data to be read/written from/to memory

The Accumulator stores

The result of the most recent operation

Why do we need a Program Counter AND a Memory Address Register?

The MAR is used to find data that the current instruction requires.

The program counter can be changed in direct response to...

Current instruction requests a jump, Increment by one after previous instruction executed

In the FDE cycle, which of these occurs last?

The instruction is copied from MDR into the CIR

studbud

Fetch Decode Execute GCSE

15 termsStudBud Administration27 plays

Covering the FDE cycle, CPU registers

Flashcards15 cardsFPractice quizPHost liveL

Questions 15

Answers

1
This register always stores the address of the next instruction to execute
CIR - Current Instruction Register
MAR - Memory Address Register
MDR - Memory Data Register
PC - Program Counter
2
The Memory Data register and Program Counter both store addresses of some description
True
False
3
This register stores the instruction currently being executed
CIR - Current Instruction Register
MAR - Memory Address Register
PC - Program Counter
MDR - Memory Data Register
4
This register stores the data that I wish to read/write to memory
PC - Program Counter
MAR - Memory Address Register
CIR - Current Instruction Register
MDR - Memory Data Register
5
Which of these is correct?
The MDR is used to locate the instruction in memory
The CIR stores the address of the current instruction
The MDR stores the data to be read/written from/to memory
The MAR stores the data to be read/written from/to memory
6
In the FDE cycle, which of these occurs first?
The instruction is copied from MDR into the CIR
The instruction is read into the MDR
The PC is copied into the MAR
The MAR is used to locate an instruction
7
The Memory Address register and Program Counter both store addresses of some description
False
True
8
FDE stands for
Fetch Decode Execute
Forward Decode Execute
Fetch Display Execute
Decode Fetch Execeute
9
In the FDE cycle, which happens first
The MAR is used to locate the instruction in memory
The PC is copied into the MAR
The MDR is copied into CIR read for decoding
The instruction is copied into MDR
10
The Accumulator stores
Calculation instructions
The result of the most recent operation
An accumulated running total of all mathematical operations
Data items to write to memory
11
Why do we need a Program Counter AND a Memory Address Register?
The MAR is used to find data that the current instruction requires.
The MAR and MDR work as a pair, the PC is not connected in the same way
The Program Counter increments when it is read
The MAR is closer to the RAM
12
This register stores the address that I wish to read/write from/to in memory
CIR - Current Instruction Register
MDR - Memory Data Register
PC - Program Counter
MAR - Memory Address Register
13
The Program Counter always increments by 1 after every single instruction
False
True
14
The program counter can be changed in direct response to...
Arithmetic operation returns zero
Current instruction requests a jump
Data input from the user
Increment by one after previous instruction executed
15
In the FDE cycle, which of these occurs last?
The instruction is read into the MDR
The instruction is copied from MDR into the CIR
The MAR is used to locate an instruction
The PC is copied into the MAR

Fetch Decode Execute GCSE Flashcards | StudBud