Explain how the CPU and memory works with suitable diagram.

CPU and its function:
The central processing unit is the part of a computer that does most of the data processing. The CPU is the brain of the computer. It consists of three basic units:
1. Control Unit (CU)
2. Arithmetic logical Unit (ALU)
3. Memory Unit (MU)

Control Unit:
Control unit controls communication with ALU and MU; decides which circuit is to be activated for reading instruction. It uses fetch-execution mechanism. Control unit gets instruction from memory and decides what to do with that instruction and transfer it to the ALU.

Arithmetic Logical Unit:
ALU performs various arithmetic operations like addition; subtraction, multiplication, division and logical operations like AND, OR, NAND etc on that instruction.

Memory Unit:
Memory Unit store instructions, data and intermediate results of processing. This units also supplies information to the other unit of computer when needed. It is also known as internal storage, main memory or primary memory.

#Mechanism- 

An instruction is fetched from primary storage by the control unit.

The control unit decodes the instruction.

The ALU receives the data and the instruction and performs the calculation and comparison.

The result is stored in primary storage which is sent to proper output device.