The first general purpose 8bit microprocessor 8080 was launched in 1974 and later in 1977 an updated version of 8080, the 8085 microprocessor was introduced with more added features which result in a functionally complete microprocessor. Introduction to 8085 microprocessor computer science. This book is designed as a firstlevel introduction to microprocessor 8085, covering its architecture, programming, and interfacing aspects. The text offers a comprehensive treatment of microprocessor s hardware and software. Lecture note on microprocessor and microcontroller theory. Microprocessor architecture programming and applications with. Intel software products are ed by and shall remain the property of intel corporation. In addition to being faster than the 8080, the 8085 had the following enhancements. Microprocessor is a central processing unit cpu etched on a single chip.
This was introduced by the intel company in the year 1977 to 1990. The third generation microprocessors, introduced in 1978 were represented by intel s 8086, zilog z800 and 80286, which were 16 bit processors with a performance like minicomputers. Microcontroller microprocessor with builtin memory and ports and can be programmed for any generic control application. Depending on registers microprocessor can be classified in two types. Although microprocessors can handle a wide range of data sizes, they typically have a primary size defined by the width of their registers in bits i. Generalpurpose microprocessor used in general computer system and can be used by programmer for any application. What is the need for ale signal in 8085 microprocessor. Introduction to microprocessors the microprocessor is one of the most important components of a digital computer. The 8085 microprocessor is an 8bit processor that includes on its chip most of the logic. The 8085 is an 8bit 8 data lines general purpose microprocessor that can address 64k. Microprocessor is a central processing unit cpu etched on a. As an example, the widely used intel 8085a microprocessor is described in detail. History of the intel microprocessor family the old generation of microprocessors. The reason for the difference is that some actually most instructions have multiple different formats.
A microprocessor is a programmable electronics chip that has computing and decision. Kaushik published an introduction to microprocessor 8085 find, read and cite all the research you need on researchgate. For a onesemester introductory course in microprocessors, this text covers the basic principles of microprocessors, microprocessor systems, and interfacing. It is a software binary compatible with the morefamous intel 8080 with only two minor instructions added to support its. The microprocessor is one of most known subject is computer engineering branch. The intel 8085 eightyeightyfive is an 8bit microprocessor produced by intel and introduced in march 1976. Unit i 8085 and 8086 processor introduction to microprocessor. Its data bus width is 8bit and address bus width is 16bit, thus it can address 216. Unit1 introduction to 8086 ece department microprocessors and microcontrollers page 2 iv address bus. Introduction to intel architecture the basics, by jim turley links to an external site. Introduction a computer is a programmable machine that receives input, stores and manipulates. It is a 40 pin c package fabricated on a single lsi chip. Microprocessor architecture programming and applications. Intel 8085 microprocessor architecture signals addressing modes instruction classification instruction settiming diagram alp format programming.
The microprocessor fetches each instruction, decodes it, and then executes it. Introduction to intel microprocessor 8086 overview of microcomputer structure and operation. Unit i syllabus introduction to 8085 basic concepts of. Introduction fundamentals of microprocessor 8085 and. The intel 8085a is a new generation, complete 8 bit parallel central processing unit. Intel 8254 is a programmable timer chip that can be interfaced with. Finally, intel corporations ted hoff and frederico fagin were credited with the design of the first. The 8080 has memory of 64 kb whereas for 8008 16 kb only. The intel 8085 microprocessor is a second generation microprocessor and is an eightbit processor designed in the year of 1976 with the nmos technology with a 40 pin dip, approximately consisting 6500 transistors having a power supply of 5v. What are the requirements to be met while interfacing io devices to. Tutorial on introduction to 8085 architecture and programming. Introduction to microprocessors ebook pdf download and read. Even though a few more processors appeared on the market 6809, 2650, scmp etc. On these lines the cpu sends out the address of the memory location that is to be written to or read from.
The 8085 microprocessor intr interrupt request used as a general purpose interrupt rst 7. A microprocessor is a controlling unit of a microcomputer, fabricated on a. The 8086 is a 16 bit microprocessor chip designed by intel, which gave rise to the x86 architecture. The 8086 is a 16 bit microprocessor chip designed by intel, which gave.
In addition to the above mentioned registers intel 8085 microprocessor also contains. The main limitations of the 8bit microprocessors were their low speed. In 1976, intel comes up with an improved version of 8bit microprocessor named 8085. The time for the back cycle of the intel 8085 a2 is 200 ns. A single integrated circuit ic has all the functional components of a cpu namely arithmetic logic unit alu, control unit and registers. They have higher priorities than the intr interrupt. Over view of microprocessor 8085 and its application iosr journal. Registers can be used for holding data, address, results. Features of 8085 intel 8085 is an 8bit, nmos microprocessor. Pdf intel 8085 microprocessor architecture anurudh kashya. The kit enables studying from low level programming with direct machine code entering to high level programming with pc tools easily. Introduction to microprocessor 6 the 8085 interrupts the 8085 has 5 interrupt inputs. Introduction to 8085 microprocessor assembly language.
Introduction to microprocessors ebook pdf download and. From wikipedia, the free encyclopedia the intel 8085 eightyeightyfive is an 8bit microprocessor produced by intel and introduced in march 1976. The address bus consists of 16, 20, 24, or more parallel signal lines. Memory system bus intel 8085 cpu io devices pic18f4520 monitor tft hex display keypad fig. It is an 8 bit general purpose microprocessor that can easily store 64k bite of memory. The 8080 processor was updated with enabledisable instruction pins and interrupt pins to form the 8085 microprocessor. It is a software binary compatible with the morefamous intel 8080 with only two minor instructions added to support its added interrupt and serial inputoutput features.
Architecture of intel 8085 microprocessor pdf fstatic. Pdf an introduction to microprocessor 8085 researchgate. This microprocessor is an update of 8080 microprocessor. The architecture of 8085 includes the alu, timing and control unit, instruction register and decoder, register array, interrupt control and serial io control in.
The clock and controller of intel 8080 were on separate chip and it utilizes two separate power. Microprocessor 8085 was introduced by intel in the year 1977 8. Captcha seminar and ppt with pdf report 8085 microprocessor ppt and pdf report. Clock oscillator and system controller were integrated on the chip. The 8085 microprocessor kit is a lowcost single board computer designed for selflearning the popular 8085 microprocessor. Use, duplication or disclosure is subject to restrictions stated in intel s software license, or as defined in aspr 7104. The first 8 lines of address bus and 8 lines of data bus are multiplexed ad0 ad7. In 1977, intel, introduced 8085 which was an updated version of 8080 last 8bit processor. Fifth generation microprocessor was introduced by intel corporation in 1993 in. The 8085 is an 8bit 8 data lines general purpose microprocessor that can address 64k byte of memory. The 8085 machine language the 8085 from intel is an 8bit microprocessor. However, z80 was so much better that intel soon lost the battle. Intel 8085 is an eight bit microprocessor of intel corporation, usually called as a. It has 16bit address bus and hence can address up to 216 65536 bytes 64kb memory locations through a0a15.
The 8085 uses a total of 246 bit patterns to form its instruction set. Lecture note on microprocessor and microcontroller theory and. Chapter 2 explores the programming model of the microprocessor and system architecture. Use accumulator register as one data source for alu operation. Jan 07, 2009 intel 8085 microprocessor is the next generation of intel 8080 cpu family. Experimenting the mtk85 with microc 8085 cpu on mars intel 8085 wiki microprocessors 14 8085 is pronounced as eightyeightyfive microprocessor.
The 5 in the model was added as it requires plus 5 voltages. The microprocessor fetches each instruction, decodes it, then executes it. The architecture of microprocessor 8085 can be divided into seven parts as follows. In the family of 16bit microprocessors, intel s 8086 was the first one to be launched in 1978. Lecture note on microprocessor and microcontroller theory vssut. Unit i introduction to intel microprocessor 8086 overview of. An introduction to microprocessor 8085 chapter 1 evolution and history of microprocessors 1. It is an 8bit microprocessor designed by intel in 1977 using nmos technology. Learn the fundamental aspects of 8085 microprocessor and implementation of examples using assembly language based on mne. No p intel corpoutt intel corpoution intel products. Pdf microprocessor 8085 by ramesh gaonkar pdf free.
As discussed earlier, 8085 microprocessor was introduced by intel in the year 1976. Experimenting the mtk85 with microc 8085 cpu on mars intel 8085 wiki microprocessor types and specifications links to an external site. Pdf the design and implementation of an intel 8085. A nice feature, singlestep running, helps students learn the. Microprocessor 8085 is the basic processor from which machine language programming can be learnt. To find the smallest number in an array of data using 8085 instruction set. As technology has progressed, microprocessors have become faster, smaller and capable of doing more work per clock cycle. This sequence is continued until all instructions are performed. I syllabus introduction to 8085 intel 8085 microprocessor. This led to the design of intel 4004, the worlds first microprocessor. Chapter 1 introduces the intel family of microprocessors with an emphasis on the microprocessor based computer system. Intel 8085 8bit microprocessor intel 8085 is an 8bit, nmos microprocessor. Fourth generation 32 bit microprocessors several different companies introduced the 32bit microprocessors, but the most popular one is the intel 80386. It was compatible with intel 8080 but needed less support of the hardware.
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