The 8085 chip is 8bit general purpose microprocessor which. Program, data and stack memories occupy the same memory space. The 8085 and address ranges now, we can break up the 16bit address of the 8085 into two pieces. Features of 8085 intel 8085 is an 8bit, nmos microprocessor. Oct, 2012 the 8085 and address ranges now, we can break up the 16bit address of the 8085 into two pieces. It processes the data as required in the instructions. Intel 8085 is an 8bit, nmos microprocessor designed by intel in 1977. Editorial content, 8805 as news and celebrity images, are not cleared for commercial use. The 8085 is an 8bit general purpose microprocessor that can address 64k byte of memory. Week 2 architecture of 8085 week 3 addressing modes and instruction set of 8085 week 4 interrupts of. As the most of the processor instructions use 16bit pointers the processor can effectively address only 64 kb of memory. For the love of physics walter lewin may 16, 2011 duration. It is an 8bit microprocessor designed by intel in 1977 using nmos technology.
Microprocessor 8085 architecture in microprocessor tutorial. Flags, interrupts, instruction register and decoders,arithmetic and logic unit and various other units explained in detail. Opcodes table of intel 8085 opcodes of intel 8085 in alphabetical order. T o the software engineer, the 8085 was essentially the same as the 8080. The time for the back cycle of the intel 8085 a2 is 200 ns. Architecture of intel 8085 microprocessor data accumulator r. Instruction set of 8085 an instruction is a binary pattern designed inside a microprocessor to perform a specific function. Motorola s 6800 series was easier to program, mos t echnologies. Learn in detail about the architecture of 8085 microprocessor. Introduction fundamentals of microprocessor 8085 and. Each instruction is represented by an 8bit binary value. Microprocessor architecture and its operations lecture 2. A microprocessor is an integrated circuit designed to function as the cpu of a microcomputer. Intel 8085 8bit microprocessor intel 8085 is an 8bit, nmos microprocessor.
Appreciate the detailed explanation about 8085 architecture. However, the 8085 had lots of hardware improvements that made it easier to design into a circuit. The ebook has complete chapters on microprocessor and it is. Here, we will describe intel 8085 as it is one of the most popular 8bit microprocessor. Clock oscillator and system controller were integrated. It is the set of instructions that the microprocessor can understand. Why would one want to name entirely different things with the same name. Opcodes of 8085 microprocessor it is a large and heavy desktop box, about a 20. 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. The intel 8085 eightyeightyfive is an 8bit microprocessor produced by intel and introduced in march 1976. Products 1 30 opcode sheet for 8085 microprocessor with descriptiondownload as text file. The address and data bus are multiplexed in this processor which helps in providing more control signals. This architecture, as outlined above, is very different from that of 80858080 and quite similar, but more powerful z80.
The internal architecture of 8085 includes the alu, timing and control unit, instruction register and decoder, register array, interrupt control and serial io control. To access memory outside of 64 kb the cpu uses special segment registers to specify where the code, stack and data 64 kb segments are positioned within 1 mb of memory see the registers section below. Jump, branch and call instructions use 16bit addresses. Introduction to microprocessor 6 the 8085 interrupts the 8085 has 5 interrupt inputs. Lecture note on microprocessor and microcontroller theory. A microprocessor is an integrated circuit with all the functions of a cpu however, it cannot be used stand alone since unlike a microcontroller it has no memory or peripherals 8086 does not have a ram or rom inside it. In this article you will get to know about the definition, architecture, block diagram and working of 8085 microprocessor. This book was first published in 1984 and it has been in the field for nearly three decades. Intel 8086 architecture chapter 2 major features of 8086 processor, 808688 cpu architecture. The microprocessor is the cpu central processing unit of a computer. Program memory program can be located anywhere in memory. The data bus is a group of lines used to carry the data between various components of microcomputer.
However, it requires less support circuitry, allowing simpler and less expensive microcomputer systems to be built. The processing is in the form of arithmetic and logical operations. Microprocessor architecture,programming and applications with the 8085 by ramesh gaonkar provides a comprehensive treatment of the microprocessor,covering both hardware and software based on the 8085 microprocessor family. The 8080 processor was updated with enabledisable instruction pins and interrupt pins to form the 8085 microprocessor. To perform addition of two 8 bit numbers using 8085. Actually, call instructions could be issued in response to an interrupt, but the circuitry to do so was rather complex and it had to be implemented outside the cpu. As discussed earlier, 8085 microprocessor was introduced by intel in the year 1976. Cpu central processing unit alu arithmeticlogic unit control logic registers, etc memory input output interfaces processor system architecture interconnections between these units. However, it has internal registers for storing intermediate and final results and interfaces with memory located outside it through the system bus. Let us understand 8085 microprocessor architecture with its internal modules or units. Lecture note on microprocessor and microcontroller theory and.
This microprocessor is an update of 8080 microprocessor. Cpu ar chitecture chapter four plantation productions, inc. The microprocessor is one of most known subject is computer engineering branch. Unfortunately, from a software perspective the other manufacturer s of ferings were better. The entire group of instructions that a microprocessor supports is called instruction set. It determines the number of operations per second the processor can perform. Intel 8085 microprocessor is the next generation of intel 8080 cpu family. It is an 8bit microprocessor which was introduced by intel in the year 1976 using nmos technology. In intel 8085, there is 16bit address, so it has capability of addressing memory up to 64 kb. The microprocessor or cpu reads each instruction from the memory, decodes it and executes it. Central processing unit cpu is carved on a single chip is called a microprocessor.
Internal architecture of 8085 microprocessor learn about. The 8085 in cludes on its chip most of the logic circuitry for per forming computing tasks and for communicating with peripherals. Tutorial on introduction to 8085 architecture and programming. The microprocessor based system consist of microprocessor as cpu. It is the number of bits processed in a single instruction. Ppt the 8085 microprocessor architecture powerpoint. Also learn about why the flags in microprocessor are called as flags. The major features of 8085 chip are 8 bit data bus, 16 bit address bus, 3.
And, yes, the 8085 is an 8bit cpu, while the 8086 is 16bit. 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. In this article you will get to know about the definition, architecture, block diagram and working of. Reduced instruction set computer risc processors complex instruction set computer cisc processors 2. Pdf chapter 4 8085 microprocessor architecture and memory. Goankar, microprocessor architecture, programming and applications with 8085, 5th edition, prentice hall week 1 basic concept and ideas about microprocessor. This is why most implementations used rst instructions to vector control to the interrupt service routine. It is a 40 pin c package fabricated on a single lsi chip. 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. Architecture, programming, and interfacing, this book is designed as a firstlevel introduction to microprocessor 8085, covering its architecture, programming, and interfacing aspects. A15 a14 a a12 a11 a10 a9 a8 a7 a6 a5 a4 a3 a2 a1 a0 chip selection location selection within the chip depending on the combination on the address lines a15 a10, the address range of the specified chip is determined. Let us discuss the architecture of 8085 microprocessor in detail.