MICROPROCESSORSAND INTERFACING
MODULE –I
Basic 80x86 Architecture
1. Role of Microprocessor in Micro Computer
A processor is a device which has computing capability, i.e., data processing capability.
The word micro stands for 'small’. Microprocessor is a CPU on a single Integrated
Circuit(IC) containing millions of very small components including transistors, resistors and
diodes. Microprocessor is a controlling unit of a micro-computer fabricated on a small chip
capable of performing ALU (Arithmetic (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.
The first microprocessor is Intel 4004 and it is 4 bit. The Intel 8086 is a 16 bit
microprocessor.
, The microprocessor can perform the following functions
1. Reads instruction from data memory.
2. Communicates with IO devices through system bus.
3. Perform computing task.
MODULE –I
Basic 80x86 Architecture
1. Role of Microprocessor in Micro Computer
A processor is a device which has computing capability, i.e., data processing capability.
The word micro stands for 'small’. Microprocessor is a CPU on a single Integrated
Circuit(IC) containing millions of very small components including transistors, resistors and
diodes. Microprocessor is a controlling unit of a micro-computer fabricated on a small chip
capable of performing ALU (Arithmetic (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.
The first microprocessor is Intel 4004 and it is 4 bit. The Intel 8086 is a 16 bit
microprocessor.
, The microprocessor can perform the following functions
1. Reads instruction from data memory.
2. Communicates with IO devices through system bus.
3. Perform computing task.
