Fetch-Execute Cycle

The fetch ........... execute cycle is a continously looping process.

There are ...... stages in the fetch-execute cycle.

• three

• four

• five

• six

The goal of the fetch stage is to copy an instruction from the CIR and store it in main memory.

• true

• false

During the fetch stage the program counter is incremented.

• true

• false

Complete this line of register transfer notation from the fetch stage.

PC <-- [PC] ...........

At the end of the fetch stage the instruction to be executed will have been copied into the ............

• program counter

• memory data register

• accumulator

• current instruction register

Before an instruction from memory can be stored in the CIR it must first be copied to the ...... register.

During the decode stage the processor must....

• determine what the instruction says

• move the data into the correct registers

• add the data to the accumulator

• put the memory address on to the address bus

Part of decoding an instruction involves splitting it into parts (tokenizing). What TWO parts are in most instructions?

• Operator / opcode

• Symbolic address

• bitwise operation

• Operand

What stage comes after fetch?

• interrupt

• decode

• execute