| Part of CPU |
Description |
| Arithmetic logic unit(ALU) |
The CPU performs all of the arithmetic operations including bit shifts and logical comparisons. |
| Control unit |
Makes sure code is executed in the correct sequence, decodes instructions, regulates the processor timings using the clock, sends signals to other devices within the computer such as RAM and the HDD, and receives
signals from other devices within the computer such as input/ouptput devices like the keyboard and mouse. |
| Clock |
The system clock isused to synchronise the actions of the CPU. The CPU switches between 0 and 1 billions of times a second, known as pulsing. CPU actions take place on each pulse. A CPU will have it's clock
speed measured in gHz. 1gHz is 1 billion instructions. |
| Register |
A register is a very faster storage location within the CPU itself. There are both generic and specific registers but you will learn more about those if you take A-level Computer Science. |
| Buses |
Buses connect the parts of the CPU. They connect the ALU, control unit, clock, and registers. |