Explain the purpose of each of the following steps in the following list:

The CPU executes each instruction in a series of small steps. Roughly speaking, the steps are as follows:

1. Fetch the next instruction from memory into the instruction register

2. Change the program counter to point to the following instruction

3. Determine the type of instruction just fetched

4. If the instruction uses a word in memory, determine where it is

5. Fetch the word, if needed, into a CPU register

6. Execute the instruction

7. Go to step 1 to begin executing the following instruction