The Bussed Architecture for Microprocessor:
The first question is what is a ‘Bus’? Bus is a group of parallel lines that
connect two or more devices as shown in fig.2. It carries information in bits.
Whenever processor (CPU) needs to access any memory or I/O device of
the microcomputer system.
Central Processing Unit:
The CPU consists of ALU (Arithmetic and Logic Unit), register unit and control
unit. The CPU fetches the stored instructions from the program memory, data
word from data memory or from an input device and after processing the data
stores the result in data memory or sends it to an output device.
a) ALU (Arithmetic and Logic Unit)
This unit performs computing functions these functions are arithmetic operations
such as addition, subtraction and logical operation such as AND, OR, XOR,
Lecture-1
An Overview of Microprocessor:
Microprocessor is a controlling unit of a microcomputer, fabricated on a small chip
that contains millions of transistors connected by wires capable of performing
Arithmetic Logical Unit (ALU) operations and communicating with the other
devices connected to it, a multipurpose, clock driven, register based, digital
integrated circuit which accepted binary data as input, processes it according to
instructions stored in its memory, and provides results as output as shown in fig 1.
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