ALU,Program counter,Instruction decoder

ALU (arithmetic/logic unit)
􀂾 Performs arithmetic functions such as add,
subtract, multiply, and divide, and logic
functions such as AND, OR, and NOT
􀂉 Program counter
􀂾 Points to the address of the next
instruction to be executed
􀂃 As each instruction is executed, the program
counter is incremented to point to the address
of the next instruction to be executed
􀂉 Instruction decoder
􀂾 Interprets the instruction fetched into the
CPU
􀂃 A CPU capable of understanding more
instructions requires more transistors to design