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. The number of bits makingp a word varies with the p. Microprocessor 8085 notes free download as word doc. The internal architecture of 8085 includes the alu, timing and control unit, instruction register and decoder, register array, interrupt control and serial io control. A microprocessor is specified b y its word size, e. Mar 20, 2020 microprocessor year of introduction word length bit memory addressing capacity pins clock remarks 4004 1971 4 1 kb 16 750 khz first microprocessor 8085 1976 8 64 kb 40 36 mhz popular 8 bit microprocessor 8086 1978 16 1 mb 40 510 mhz popular 8 bit microprocessor 8088 1980 816 1 mb 40 58 mhz widely used in pcxt 80286 1982 16. The microprocessor is a semiconductor device integrated circuit manufactured by the vlsi very large scale integration technique. Memory interfacing in 8085 memory structure wait state. It depends upon the width of internal data bus, registers, alu. Lecture note on microprocessor and microcontroller theory vssut. The 8085 microprocessor consisted of 6500 mos transistors and could work at clock frequencies of 35 mhz. This microprocessor is an update of 8080 microprocessor. The maximum addressable memory space is a 64k b 16 k c 8k d 4k 2.
Hello friends,lots of reader would like to read the content for microprocessor short question and answer in the offline mode as well,here is the pdf file which contains lots of microprocessor short question and answer pdf for offline study you can download pdf file. The entire group of instructions that a microprocessor supports is called instruction set. Aug 30, 2017 8085 microprocessor architecture or block diagram of 8085 limitations of 8bit microprocessor. You can visit similar threads as well for more free pdf and get yourself updated. Lecture note on microprocessor and microcontroller theory. Download file fundamentals of microprocessor8085 and. The 8085 uses a total of 246 bit patterns to form its instruction. It has 40 pins ic integrated circuit fabricated on single chip. The 5 in the model was added as it requires plus 5 voltages.
What is the word length in an 8085 microprocessor answers. Here 0 denotes positive sign and 1 denotes the negative sign. A bus is just a group of connections that all share a common function. Microprocessor book by ramesh gaonkar pdf download. The 8085 in the 8085 microprocessor is the designation given to the microprocessor by intel. Find the value of count using technique used in 8085 so that delay will be of 200 s. A processor with longer word length is more powerful and can process data at a faster speed as compared to processor with shorter word length. Dec 03, 20 the 8085 machine language the 8085 from intel is an 8bit microprocessor. Questions on introduction to microprocessor 8085 instruction set mcq type questions 1. What is meant by the statement that 8085 is a 8bit microprocessor. A machine with8bitt word length has a maximum of 256 words 28. Tutorial on introduction to 8085 architecture and programming. Hence the word length of a processor is equivalent to the data bus the word length of 8085 is 8 bits.
Unit i syllabus introduction to 8085 basic concepts of. Each instruction is represented by an 8bit binary value. In 8085, the length is measured in terms of byte rather then word because 8085 microprocessor has 8bit data bus. Mvi b, 3eh move the data 3eh given in the instruction to b register. A word refers to the basic data size or bit size that can be processed by the. Size of the data bus determines what arithmetic can be done. It is a 40 pin c package fabricated on a single lsi chip. Tutorial on introduction to 8085 architecture and programming halt. Word length of a processor is the maximum number of bits it can accept as input, process or deliver as output. Apr 05, 2017 so based on the word length of a processor we can have 8bit, 16bit, 32bit and 64bit processors. Apr 22, 2016 8085 has 246 bit patterns, amounting to 74 different instructions for performing various operations. It depends upon the width of internal data bus, registers, alu, etc.
The reason for the difference is that some actually most instructions have multiple different formats. Each microprocessor has its own binary word, meanings and language based on its logic design. I syllabus introduction to 8085 intel 8085 microprocessor. A microcomputer is a system which is capable of processing a stream of input. The word length ranges from 4 bits to 64 bits depending upon the type of the microcomputer. Introduction fundamentals of microprocessor 8085 and. And dont forget to buy8085 microprocessor ramesh gaonkar. Each microprocessor recognizes and processes a geoup of bits called the word, and microprocessors are classified according to their word length. The words are formed by combining number of bits for a given machine. They cannot be used by other microprocessor manufactures. It was compatible with intel 8080 but needed less support of the hardware. To find the smallest number in an array of data using 8085 instruction set.
Data bus buffer the tristate bidirectional 8 bit buffer is used to interface the 8255a to the microprocessor data bus d0d7. A microprocessor is also called the cpu, the central processing unit. The architecture of a microprocessor is to be learnt in terms of registers, memory. There are now many different microprocessors available. The instruction set of a microprocessor is the collection of the instructions that the microprocessor is designed to execute. Jul 28, 2018 the size of the memory is n x m as shown in fig.
It is 40 pin ic, requires 3 mhz speed of operation and clock cycle is 320 ns. In 8085 microprocessor the most significant bit is used for the sign. The microprocessor has multiple data type formats like binary, bcd, ascii, signed and. Instead of speaking of each bit or connection in the address separately, for example, all 16 are taken together and referred to simply as the address bus. Instruction word size in microprocessor geeksforgeeks. Bus is a group of conducting lines that carries data, address and control signals. Write an assembly language program to count number of vowels in a given string. Hence the word length of a processor is equivalent to the data bus. Data is transmitted or received by buffer upon the execution of input or output instructions by the cpu. Each instruction has two parts, one is task to be performed, called the operation code opcode, and the second is the data to be operated on called the operand.
The word length ranges from 4 bits for small microprocessor, to 64 bits for highend microcomputers. Due to 16bit address lines, we can address only up to 64 kbytes of memory. An 8bit microprocessor can process 8 bit data at a time. B y the term word size means the n umber of bits of data that is processed by the microprocessor as a. Title to count number of vowels in given line of a text dosseg.
What is the technology used in the manufacture of 8085. Features of a microprocessor here is a list of some of the most prominent features of any microprocessor. Multiple byte instructions are stored in successive memory locations. The number of bits in a microprocessors word, is a measure of its. Instruction set of 8085 an instruction is a binary pattern designed inside a microprocessor to perform a specific function. The 8085 instruction set is classified into 3 categories by considering the length of the instructions. This was introduced by the intel company in the year 1977 to 1990. An instruction is a binary pattern entered through an input device in memory to command the microprocessor for performing that specific function. The other improved 8 bit microprocessors include motorola mc 6809, zilog z80 and rca cosmac. There are 5 interrupt signals in 8085 microprocessor. An instruction is a command to the microprocessor to perform a given task on a specified data. 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.
An integer without a sign is represented by all the 8bits in a microprocessor register. Central processing unit cpu is carved on a single chip is called a microprocessor. To find the largest number in an array of data using 8085 instruction set. The instruction set of a microprocessor is the collection of the instructions that the microprocessor is designed to. The microprocessor has multiple data type formats like binary, bcd, ascii, signed and unsigned numbers. An 8bit microprocessor can process 8bit data at a time. As discussed earlier, 8085 microprocessor was introduced by intel in the year 1976. Word length the number of bits microprocessor recognizes and processes at a. The 8085 microprocessor is an 8bit processor available as a 40pin ic. A number of words for a machine is fixed as the number of bits for a machine are fixed. The 8085 uses a total of 246 bit patterns to form its instruction set.
The microprocessor has multiple data type formats like binary, bcd, ascii, signed and unsigned. Microprocessor year of introduction word length bit memory addressing capacity pins clock remarks 4004 1971 4 1 kb 16 750 khz first microprocessor 8085 1976 8 64 kb 40 36 mhz popular 8 bit microprocessor 8086 1978 16 1 mb 40 510 mhz popular 8 bit microprocessor 8088 1980 816 1 mb 40 58 mhz widely used in pcxt 80286 1982 16. An instruction is a command given to the computer to perform a specified operation on given data. Machine language very low level programming language. Microprocessor with a 16 bit address bus is used in a linear memory selection configuration address bus lines are directly used as chip selects of memory chips with four memory chips. In 1978, intel introduced the 16 bit microprocessor 8086 and 8088 in 1979. Microprocessor is a programcontrolled device, which fetches the instructions from memory, decodes and executes the instructions. It is an nmos device having around 6200 transistors contained in a 40 pin dip package. The word length of micromputer or microprocessor is given as nbit where, n 4, 8, 16, 32 or 64. For memory interfacing in 8085, following important points are to be kept in mind. The 8085 machine language the 8085 from intel is an 8bit microprocessor. Microprocessor and assembly language programming bca vi sem gram reoti, behind aurobindo hospital, sanwer road,i ndorem. Intel 8085 8bit microprocessor intel 8085 is an 8bit, nmos microprocessor.
In addition to the above mentioned registers intel 8085 microprocessor also contains address buffer. The word length of a processor depends on data bus, thats why intel 8085 is called 8 bit microprocessor because it have an 8 bit data bus. Understanding 80858086 microprocessors and peripheral ics. The data bus also works as address bus when multiplexed with lower order address bus. The word length is 8bit hence processing speed is low. In addition to the above rst n restart restart is a oneword call instruction. The 5 means it is a single power supply 5 volt version of the 8080, with enhancements. In addition to the above rst n restart restart is a one word call instruction. Let us discuss the architecture of 8085 microprocessor in. It is bidirectional as microprocessor requires to send or receive data. Questions on introduction to microprocessor 8085 instruction set.
The range of word length is from 4 bits to 64 bits depending upon the type of the microcomputer. A microprocessor which has n data lines is called an nbit microprocessor i. It determines the number of operations per second the processor can perform. A word refers to the basic data size or bit size that can be processed by the arithmetic and logic unit of the processor. This is why all registers and memory are 8 bits wide, its the width of the data bus on the 8085 cpu. Over view of microprocessor 8085 and its application. The microprocessor has multiple data type formats like binary, bcd. Control word and status word also transferred through this data bus buffer. Instruction is a command in binary that is recognize and executed by the processor to accomplish a task. Instructions are formed my the microprocessor design engineer, who selects a particular combination of words to give them a specific meaning by applying the logic. Microprocessor book by ramesh gaonkar pdf download 17 mar 20 8085 microprocessor by ramesh s gaonkar pdf free download. Word length the number of bits the processor can process at a time is called the word length of the processor. Risc reduced instruction set computer risc is a type of microprocessor architecture which uses small, general purpose and highly optimized instruction set rather than more specialized set of instructions found in others.
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