Internal Clock
Program Control Unit
Performs operations on data, such as addition, subtraction; fixed-point and floating-point arithmetic; Boolean logic
Used for flow control
Derived form the system clock (directly or indirectly)
Fast memory locations that may be dedicated or general purpose
Fetches, decodes and executes program instructions
Arithmetic & Logic Unit (ALU)
Link the control unit, and ALU and registers
Logic Gates
Registers
Internal Buses
