Processor
Control Unit
Memory
ALU
Processor
What
is a machine cycle?
p. 184 Fig. 4-6
Next
Step 1. Fetch
Obtain program instruction or data item from memory
Obtain program instruction or data item from memory
Step 2. Decode
Translate instruction into commands
Translate instruction into commands
Step 4. Store
Write result to memory
Write result to memory
Step 3. Execute
Carry out command
Carry out command
ØFour operations of
the CPU comprise a machine cycle