Moon Welfare Foundation

A microprocessor is a controlling unit of a micro-computer, fabricated on a small chip capable of performing ALU (Arithmetic Logical Unit) operations and communicating with the other devices connected to it. Microprocessor consists of an ALU, register array, and a control unit. ALU performs arithmetical and logical operations on the data received from the memory or an input device. Register array consists of registers identified by letters like B, C, D, E, H, L and accumulator. The control unit controls the flow of data and instructions within the computer. Block Diagram of a Basic Microcomputer How does a Microprocessor Work? The microprocessor follows a sequence: Fetch, Decode, and then Execute. Initially, the instructions are stored in the memory in a sequential order. The microprocessor fetches those instructions from the memory, then decodes it and executes those instructions till STOP instruction is reached. Later, it sends the result in binary to the output port. Be

input  -  Output Interface Input Output Interface provides a method for transferring information between internal storage and external I/O devices. Peripherals connected to a  computer  need special communication links for interfacing them with the central processing unit. . A  peripheral device  connects to a  computer  system to add functionality. Examples are a mouse, keyboard, monitor, printer and scanner. Learn about the different types of  peripheral devices  and how they allow you to do more with your  computer Input/Output Subsystem The I/O subsystem of a computer provides an efficient mode of communication between the central system and the outside environment. It handles all the input-output operations of the computer system. Peripheral Devices Input or output devices that are connected to computer are called  peripheral devices . These devices are designed to read information into or out of the memory unit upon command from the CPU and are considered to be the p