Fetch-Execute Cycle Flashcards

Describe the **Fetch** part of the cycle.

*The instruction stored at the memory address in the PC is fetched. The memory address is copied to the MAR.*

*The memory contents at the address are fetched into the MDR. The PC is now incremented.*

Describe the **Decode** part of the cycle.

*The instruction is copied from the MDR to the CU. The CU decodes the instruction and turns it into a series of signals.*

*If more data is required, then the CU will send out signals to fetch that data.* 

Describe the **Execute** part of the cycle.

*The CU sends out signals to the relevant components in order to execute the instruction.*

What does CPU stand for?

Central Processing Unit