2.2.5. Control Instructions

So these are the control instructions, so whatever instruction we are having in the instruction set all those instructions can be categorized into these particular 4 functions.

Control instructions are commands that dictate how the computer operates and handles tasks. They act as a set of instructions guiding the computer on what operations to perform and how to manage the processing. These instructions can be categorized into four main areas: data processing, data storage, data movement, and control.

Think of control instructions as a recipe for cooking. Just as a recipe tells you exactly what steps to follow, what ingredients to use, and how to combine them, control instructions tell the computer the specific actions it needs to take to complete a task.

Now, we are going to see the functional view. So one is your data movement, data storage, data processing and control.

The functions of a computer can be categorized into four primary activities: 1) Data Movement refers to the transfer of data from one point to another, such as from input devices like keyboards to the computer's memory. 2) Data Storage involves saving processed data in memory for future use. 3) Data Processing is the actual manipulation of data, where calculations or comparisons take place. 4) Control ensures that all these processes run smoothly and in a specific order, managing the timing and execution of the other three categories.

Consider a team working on a project. Each team member has a specific role: one collects information (data movement), another organizes the collected data (data storage), a third analyzes the data and prepares reports (data processing), and a fourth person supervises the workflow, ensuring everyone stays on task and follows the plan (control).

So one class of information is your data movement, second one is your storage. So we are having information in some devices now you have to bring it to the storage unit.

Input devices, such as keyboards and mice, are essential for data movement. They allow users to enter information into the computer. Once the data is entered, it needs to be stored in memory so that the CPU can access it for processing later. This step bridges the interaction between the user and the computer, facilitating the use of information.

Imagine a teacher collecting assignments from students. The teacher uses a basket (input device) to collect the assignments (data movement). Once all the assignments are collected, they are organized in a filing cabinet (storage) where they can be accessed later for grading (processing).

Third class is your data processing. So we are having the information in our storage now processing elements or processing unit have having defined processing element like that adding 2 numbers multiplying 2 numbers.

Data processing involves using the CPU to perform calculations or operations on stored data. Whether it's adding two numbers or more complex tasks, the CPU manipulates the data according to the instructions it receives. Once processing is complete, the results need to be stored again in memory or sent to an output device.

Think of a calculator. When you input numbers and an operator (like addition or multiplication), the calculator processes this information and gives you the answer. After calculating, you can choose to write the result down (store it) or display it on the screen (output).

So these are the different tasks that we can perform. Now we will see what is the structure of a computer is: this is the structural view.

Once data has been processed, it is often displayed to the user through output devices such as monitors or printers. This completes the cycle of input, process, and output, ensuring that users receive the results of their computations clearly and effectively.

Picture ordering food at a restaurant. You tell the waiter (input) what you want to eat. The chef (processing) prepares your order, and finally, the waiter brings your meal to your table (output). Just like in computing, where data flows from input to processing, then to output.

--