The fetch-decode-execute cycle

Fill the gaps!
The main role of the _1___ is to run or _2___ a set of stored instructions known as a _3___.

• 1. 1. CCU(Central Controlling Unit)
     2. manipulate
     3. applications

• 1. 1. CPU(Central Processing Unit)
     2. open
     3. system programs

• 1. 1. CPU(Central Processing Unit)
     2. execute
     3. computer programs

• 1. 1. CPU(Central Processing Universe)
     2. execute
     3. utility programs

How many major components does a processor have?

• 3

• 2

• 4

• 5

Where are main components of CPU shown?

• Arithmetic logic unit (ALU)

  Control Unit (CU)

  Registers

• Program counter (PC)

  Accumulator (ACC)

  Registers

• Arithmetic logic unit (ALU)

  Current Instructions Register (CIR)

  Control Unit (CU)

• Registers

  Memory Data Register (MDR)

  Accumulator (ACC)

Arithmetic logic unit (ALU) - ...

• issues commands to the other hardware components to help ensure programs are carried out correctly

• store data about memory locations, instructions and data used during execution of an instruction

• carries out of the calculations needed during the execution of a program

• stores the address of the next instruction waiting to be executed

Control Unit - ...

• Collect an instruction from another location

• store data about memory locations, instructions and data used during execution of an instruction

• Any data or instructions that pass into or out of main memory must pass through the MDR

• issues commands to the other hardware components to help ensure programs are carried out correctly

Registers - ....

• store data about memory locations, instructions and data used during execution of an instruction

• A register used by the ALU to store the result of processing the ALU  

• Hold the address of the memory location being accessed, either to read data from or write data to

• Carry out the instruction described in a computer program

Accumulator ACC -

• carries out of the calculations needed during the execution of a program

• A register used by the ALU to store the result of processing the ALU  

• Hold the address of the memory location being accessed, either to read data from or write data to

• Work out what an instruction means/what it is telling the CPU to do

Memory address register - ....

• Hold the address of the memory location being accessed, either to read data from or write data to

• stores the address of the next instruction waiting to be executed

• store data about memory locations, instructions and data used during execution of an instruction

• Any data or instructions that pass into or out of main memory must pass through the MDR

______ cycle is a set of steps that helps computer to carry out many instructions every second.

What does mean fetch?