It is an 8 bit general purpose microprocessor that can easily store 64k bite of memory. Intel 8085 microprocessor architecture mjpage design. This is the functional block diagram of the 8085 microprocessor. Interrupt signals are generated by external peripheral devices. Oct, 2012 microprocessor architecture the microprocessor can be programmed to perform functions on given data by writing specific instructions into its memory. Microprocessor 8085 architecture 8085 is pronounced as eightyeightyfive microprocessor. The modified versions of the 8085 processor have these. It means 8086 architecture supports parallel processing. The pins of a 8085 microprocessor can be classified into seven groups. Learn in detail about the architecture of 8085 microprocessor.
A microprocessorbased system from the above description, we can draw the following block diagram to represent a microprocessorbased system. Microprocessor is a digital device on a chip which can fetch instructions from a memory, decode and execute them i. The microprocessor reads one instruction at a time, matches it with its instruction set, and performs the data manipulation specified. The microprocessor is one of the most important components of a digital computer. Pdf an introduction to microprocessor 8085 researchgate.
However, it requires less support circuitry, allowing simpler and less expensive microcomputer systems. The block diagram explaining the architecture of intel 8085 microprocessor is shown in fig. The program counter pc, contains the address of the next instruction. It starts executing new program indicated by the interrupt signal. These signals are used to identify the nature of operation. This microprocessor had major improvement over the execution speed of 8085.
Appreciate the detailed explanation about 8085 architecture. The 8085 architecture consists of control unit,alu,registers,accumulator,flags,program counter,stack pointer,instruction register,memory address register,control register etc. This microprocessor is an update of 8080 microprocessor. I syllabus introduction to 8085 intel 8085 microprocessor.
Generates signals within microprocessor to carry out the instruction, which has been decoded. Note that the 8086 has data bus width of 16bit, and it is able to address. This processor is the updated version of the microprocessor. Characteristics of risc the major characteristics of a risc processor are as follows. Generally, the 8085 is an 8bit microprocessor, and it was launched by intel team in the year of 1976 with the help of nmos technology. Intel 8086 microprocessor architecture, features, and signals 63 3. Introduction fundamentals of microprocessor 8085 and. In this microprocessor the program can be located from anywhere in the memory.
Microprocessor architecture, programming and applications with the 8085 this book provides a comprehensive treatment of the microprocessor, covering both hardware and software based on the 8085 microprocessor family. The address and data bus are multiplexed in this processor which helps in providing more control signals. A microprocessor which has n data lines is called an nbit microprocessor i. It is a 8 bit microprocessor, introduce by intel in 1976. Microprocessor and interfacing pdf notes mpi notes pdf. The block diagram of a computer is shown in figure 1. Its data bus width is 8bit and address bus width is 16bit, thus it can address 216 64 kb of memory. It determines the number of operations per second the processor can perform. The 8088 microprocessor is similar to 8086 processor in architecture,but the basic difference is it has only 8bit data bus even though the alu is of 16bit. Lecture note on microprocessor and microcontroller theory and. Microprocessor 8085 communicates via its address bus of 2bytes width the lower byte. The functional components of a cpu are arithmetic logic unit alu, control and timing units, registers are found in a single integrated circuit called ic. Programming and applications with 8085, 5th edition.
Basic concepts of microprocessors differences between. Let us discuss the architecture of 8085 microprocessor in detail. Operations performed by 8085 the alu performs the arithmetic and logical operations. It is an nmos device having around 6200 transistors contained in a 40 pin dip package. Microprocessor architecture programming and application. Goankar, microprocessor architecture, programming and applications with 8085, 5th edition, prentice hall week 1 basic concept and ideas about microprocessor. Central processing unit cpu is carved on a single chip is called a microprocessor. It has 16bit address bus and hence can address up to 26165535 bytes 64kb memory location through a0a15. Gaonkar written the book namely microprocessor architecture programming and application with 8085 8080a author r.
The five main functional components of 8085a microprocessor are given below. Interfacing 8155 with 8085 microprocessor pdf in what way and differs and features. A15a8, it carries the most significant 8bits of memoryio address. Also learn about why the flags in microprocessor are called as flags. The first microprocessor to make it into a home computer. Microprocessor architecture, programming, and applications. Architecture of risc risc microprocessor architecture uses highlyoptimized set of instructions. Instruction register ir holds the currently executing instruction. It is an 8bit microprocessor designed by intel in 1977 using nmos technology. In this tutorial, we will discuss the architecture, pin diagram and other key concepts of microprocessors. The following image depicts the pin diagram of 8085 microprocessor.
Intel 8085 microprocessor internal block diagram in addition to the above mentioned registers intel 8085 microprocessor also contains address buffer and dataaddress buffer. Dr e m mohammed intel 8085 cpu block diagram the 8085 block diagram. Week 2 architecture of 8085 week 3 addressing modes and instruction set of 8085 week 4 interrupts of. Internal architecture of 8085 microprocessor learn about. Tutorial on introduction to 8085 architecture and programming.
The intel 8085 eightyeightyfive is an 8bit microprocessor produced by intel and introduced in march 1976. Ad7ad0, it carries the least significant 8bit address and data bus. This is the function al block diagram of 8085 microprocessor. Microprocessor 8085 pin configuration tutorialspoint. It is the set of instructions that the microprocessor can understand. A typical microprocessor architecture is shown in figure 1. Revised to include the most recent technological changes, this comprehensive survey offers an integrated treatment of both the hardware and software aspects of the microprocessor, focusing on the 8085 microprocessor family to teach the basic concepts underlying programmable devices. Chapter 4 8085 microprocessor architecture and memory. The students are studying the subject are supposed to learn the architecture of a typical microprocessor and also get general information about microprocessor based control systems.
Over view of microprocessor 8085 and its application. Intel 8085 microprocessor architecture signals addressing modes instruction classification instruction settiming diagram alp format programming. After execution of the new program, microprocessor goes back to the previous program. Pdf books download book microprocessor architecture programming and application with 8085 8080a by r. Here you can download the free lecture notes of microprocessor and interfacing pdf notes mpi notes pdf materials with multiple file links to download. It is a softwarebinary compatible with the morefamous intel 8080 with only two minor instructions added to support its added interrupt and serial inputoutput features. It always contains one of the operands on which arithmeticlogic has to be performed. The 8080 processor was updated with enabledisable instruction pins and interrupt pins to form the 8085 microprocessor. Also learn about carry flag, auxiliary carry flag and their differences along.
It is used in portable devices like apple ipod due to its power efficiency. It has about 5 interrupts that range from the lowest to the highest. After the arithmeticlogic operation, the contents of accumulator are replaced by the result. Microprocessor architecture the microprocessor can be programmed to perform functions on given data by writing specific instructions into its memory. These were used in computers that used the cp or m operating system. It is the number of bits processed in a single instruction. Microprocessors and interfacing 8086, 8051, 8096, and. What is the technology used in the manufacture of 8085. Architecture of 8085, pin diagram, memory interfacing, addressing modes, instruction set. Microprocessormicrocontroller the first microprocessor to make it into a home computer was the intel 8080, a complete 8bit computer on one chip. Microprocessor and interfacing notes pdf mpi pdf notes book starts with the topics vector interrupt table, timing diagram, interrupt structure of 8086. It is also referred to as a computers logic chip, micro chip, and processor. As discussed earlier, 8085 microprocessor was introduced by intel in the year 1976. Pdf lecture notes on microprocessor and microcomputer.
Flags, interrupts, instruction register and decoders,arithmetic and logic unit and various other units explained in detail. What is meant by the statement that 8085 is a 8bit microprocessor. Reduced instruction set computer risc processors complex instruction set computer cisc processors 2. It is a 8bit register which is used to perform airthmetical and logical operation.
When microprocessor receives interrupt signal, it discontinues whatever it was executing. Also the program, data and the stack memories occupy equal memory. Before knowing about the 8085 architecture in detail, lets us briefly discuss about the basic features of 8085 processor 8085 microprocessor is an 8bit microprocessor with a 40 pin dual in line package. Lecture note on microprocessor and microcontroller theory. Draw the block diagram of the builtin clock generator of 8085. In this article you will get to know about the definition, architecture, block diagram and working of 8085 microprocessor. Also the information can be placed anywhere as it uses 16 bit addresses. The timing diagram provides information regarding the status of various. This book was first published in 1984 and it has been in the field for nearly three decades.