01-05-2012, 11:38 AM
8085 MICROPROCESSOR
Unit 1 Intorduction to 8085 Microprocessor.doc (Size: 452.5 KB / Downloads: 88)
Introduction
Microprocessor is a Central Processing Unit (CPU) etched on a single chip. A single Integrated Circuit (IC) has all the functional components of a CPU namely Arithmetic Logic Unit (ALU), Control Unit and registers. The 8085 microprocessor is an 8-bit processor that includes on its chip most of the logic circuitry for performing computing tasks and for communicating with peripherals. The architecture of a microprocessor is to be learnt in terms of registers, memory addressing, addressing modes, instruction set, interfacing with memory and Input and Output (I/O) devices and interrupt handling. It is necessary to learn about the above mentioned concepts to write efficient assembly language programs, and to design microprocessor based systems. This unit gives you an overall idea about the microprocessors, the detailed discussion about 8085 architecture and interfacing of 8085 with Programmable Peripheral Interface (PPI) devices.
Learning Objectives
• To understand the basics and evolution of microprocessors
• To study about the functional components of 8085 in detail
• To discuss the different types of memory addressing schemes 0f 8085
• To learn the various addressing modes supported by 8085
• To study the various types of instructions provided by 8085
• To study the pin diagram and the signals of various pins of 8085
• To discuss about the timing and execution of instructions by 8085
• To understand the interrupt handling of 8085
Have you understood?
1. What are the major components of a digital computer?
2. What are the functional components of a CPU?
3. What is a microprocessor?
Evolution of Microprocessors
The first microprocessor was introduced in 1971 by Intel Corporation, U.S.A. It was a 4-bit microprocessor, the Intel 4004. The 4004 was introduced on November 15, 1971 and originally ran at a clock speed of 108KHz (108,000 cycles per second, or just over one-tenth a megahertz). The 4004 contained 2,300 transistors and was built on a 10-micron process. This means that each line, trace, or transistor could be spaced about 10 microns (millionths of a meter) apart. Data was transferred 4 bits at a time, and the maximum addressable memory was only 640 bytes. The 4004 was designed for use in a calculator but proved to be useful for many other functions because of its inherent programmability. In 1972, Intel introduced the 1st 8-bit processor, the Intel 8008. The Intel 8004 and 8008 both used Positive Channel Metal Oxide Semiconductor (PMOS) technology. In 1973 a more powerful and faster 8-bit processor, the Intel 8080 was introduced. It employed Negative Channel metal Oxide semiconductor (NMOS) technology.
Unit 1 Intorduction to 8085 Microprocessor.doc (Size: 452.5 KB / Downloads: 88)
Introduction
Microprocessor is a Central Processing Unit (CPU) etched on a single chip. A single Integrated Circuit (IC) has all the functional components of a CPU namely Arithmetic Logic Unit (ALU), Control Unit and registers. The 8085 microprocessor is an 8-bit processor that includes on its chip most of the logic circuitry for performing computing tasks and for communicating with peripherals. The architecture of a microprocessor is to be learnt in terms of registers, memory addressing, addressing modes, instruction set, interfacing with memory and Input and Output (I/O) devices and interrupt handling. It is necessary to learn about the above mentioned concepts to write efficient assembly language programs, and to design microprocessor based systems. This unit gives you an overall idea about the microprocessors, the detailed discussion about 8085 architecture and interfacing of 8085 with Programmable Peripheral Interface (PPI) devices.
Learning Objectives
• To understand the basics and evolution of microprocessors
• To study about the functional components of 8085 in detail
• To discuss the different types of memory addressing schemes 0f 8085
• To learn the various addressing modes supported by 8085
• To study the various types of instructions provided by 8085
• To study the pin diagram and the signals of various pins of 8085
• To discuss about the timing and execution of instructions by 8085
• To understand the interrupt handling of 8085
Have you understood?
1. What are the major components of a digital computer?
2. What are the functional components of a CPU?
3. What is a microprocessor?
Evolution of Microprocessors
The first microprocessor was introduced in 1971 by Intel Corporation, U.S.A. It was a 4-bit microprocessor, the Intel 4004. The 4004 was introduced on November 15, 1971 and originally ran at a clock speed of 108KHz (108,000 cycles per second, or just over one-tenth a megahertz). The 4004 contained 2,300 transistors and was built on a 10-micron process. This means that each line, trace, or transistor could be spaced about 10 microns (millionths of a meter) apart. Data was transferred 4 bits at a time, and the maximum addressable memory was only 640 bytes. The 4004 was designed for use in a calculator but proved to be useful for many other functions because of its inherent programmability. In 1972, Intel introduced the 1st 8-bit processor, the Intel 8008. The Intel 8004 and 8008 both used Positive Channel Metal Oxide Semiconductor (PMOS) technology. In 1973 a more powerful and faster 8-bit processor, the Intel 8080 was introduced. It employed Negative Channel metal Oxide semiconductor (NMOS) technology.