The mov instruction copies a byte or a word from source to destination. Xlat the xlat instruction is used to translate a byte in al from one code to another code. One operand must be a microprocessor register, the other one can be a register. Saraswati saha, assistant professor, ece department, rcciit, kolkata. Features of 8086the most prominent features of a 8086 microprocessor are as follows. The in instruction takes the input from the port and transfers that data into the register. Xlat is executed now, it adds the content of the al with bx to find the offse. Due to the mismatch in the speed between the microprocessor and other devices, a set of latches and buffers are required to interface the microprocessor with other devices. In 8086 microprocessor, the address bus is bit wide a.
Before the xlat instruction can be executed, the lookup table containing the values for the new code must be put in memory, and the offset of the starting address of the lookup table must be loaded in bx. Xlat replace the data in al with a data in a user defined lookup table bx stores the beginning address of the table at the beginning of the execution, the. The microprocessor is of small size chip, hence is portable. A directory of objective type questions covering all the computer science subjects. Instruction set is the entire group of instructions that a microprocessor supports. Practice these mcq questions and answers for preparation of various competitive and entrance exams. Acs college of engineering department of biomedical.
May 22, 2018 a status flags there are 6 flag registers in 8086 microprocessor which become set1 or reset0 depending upon condition after either 8bit or 16bit operation. To perform addition of two 8 bit numbers using 8085. Introduction to 8086 microprocessor or features of 8086 microprocessor. It also describes the interface of both dc and stepper motors. Instruction is a command use by a processor to perform a specific operation. Write an 8086 program that displays the packed bcd. Multiple choice questions on microprocessor topic 8086 instruction set. Microprocessors are manufactured by using metaloxide semiconductor technology, which has low power consumption. The operation of the xlat instruction at the point just before. It was the first 16bit processor having 16bit alu, 16bit registers, internal data bus, and 16bit external data bus resulting in. It can be used for an ascii to ebcdic code conversion. The way an instruction accesses its operands is called its addressing modes.
If you want to divide a byte by a byte, you must first put the dividend byte in al and fill ah with all 0s. Microprocessors and interfaces sanjay vidhyadharan. Downloading uploading a merge pdf files dos program file. Microprocessor 8086 instruction sets tutorialspoint. The memory, address bus, data buses are shared resources between the two processors. To multiply two 16bit data multibyte multiplication using 8086 microprocessor. Chapter 11 provides a detailed look at basic io interfacing, including pias, timers, the 16550 uart, and adcdac. Scribd is the worlds largest social reading and publishing site.
In this video i have tried to explain everything in detail and from scratch,thu. The microprocessors are versatile as we can use the same chip in a number of applications by configuring the software program. The 20 lines of the address bus operate in multiplexed mode. This table contains values that are substituted for the original value in al. These two instructions are supported by 8086 microprocessor to take directly transfer data between gpio ports. Odd and even memory banks, 2716 rom, 6116 sram, chip selection with bhe and a0, byte and word selection on 8086, lecture26. Zaman leave a comment on program to find 2s complement of an 8bit number 8086 microprocessor program no. Microprocessor short questions and answers pdf if you have any questions regarding this free computer science tutorials,short questions and answers,multiple choice questions and answersmcq sets,online testquiz,short study notes dont hesitate to contact us via facebook,or through our website. Likewise, if you want to divide a word by another word, then put the dividend word in ax and fill dx with all 0s.
It can prefetches upto 6 instruction bytes from memory and. It is a singlebyte instruction, and with the slow bus and limited cache, anything you can do to reduce code size amounts to. The first microprocessor was the intel 4004, introduced in. The control signals for maximum mode of operation are.
Multiple microprocessors, working together, are the hearts of datacenters, supercomputers, communications products, and other digital devices. Flag register of 8086 microprocessor geeksforgeeks. These instructions are used to transfer the data from the source. The microprocessor can readwrite 16 bit data from or to a.
It determines the number of operations per second the processor can perform. Microprocessor short questions and answers set2 examradar. Pdf lecture notes on microprocessor and microcomputer. It has an instruction queue, which is capable of storing six instruction bytes from the memory resulting in faster processing. Maximum mode 8086 system here, either a numeric coprocessor of the type 8087 or another processor is interfaced with 8086. May 29, 2018 pin diagram of 8086 microprocessor is as given below. Xlat adds the contents of al to bx and uses the resulting offset to point to an entry in an 8 bit translate table. The microprocessor, also known as the central processing unit cpu, is the brain of all computers and many household and electronic devices. Nov 08, 2020 8086 microprocessor interfacing with 8255 pdf different modes. Explain the operation of each data movement instruction with applicable addressing modes. It is a singlebyte instruction, and with the slow bus and limited cache, anything you can do to reduce code size amounts to a massive, tangible improvement in speed. The 8086 family of microprocessors, including the 8086, 80c86, and 80c86al, are presented in 40pin dip packages. Microprocessors theory and applications intel and motorola rafiquzzaman phi 6.
Microprocessors ans interfacing programming and hardware mcgraw hill douglas v. Microprocessors and microcontrollers page 1 unitii 8086 assembly language programming contents at a glance. Question two 20 marks a with a neat diagram, explain the architecture of 8086 microprocessor along with functions of each block and registers. Xlat is actually a huge performance win on the 8086. There are 24 io pins of the 82c55a make it compatible with the 3. Microprocessor and microcontroller multiple choice. It translates a byte in al using a table in memory.
The 8 data bytes are stored from memory location e000h to e007h. Multiple choice questions on 8086 microprocessor 1. It pushes the flag register contents to the top of the stack. Intel 8086 microprocessor is the enhanced version of intel 8085 microprocessor. Apr 03, 2020 the microprocessor performs different operations on these fields. Krishna kumar mmm1lu3v12004 2 it requires single phase clock with 33% duty cycle to provide internal timing. Intel introduced the 16bit microprocessor 8086 in 1988. In 8086 microprocessor the following has the highest priority among all type interrupts. The length an instruction may vary from one byte to six bytes. It has a 16bit data bus, so it can read data from or write data to memory and ports either 16bit or 8bit at a time. Program to find 2s complement of an 8bit number 8086 gyancs. Microprocessor short questions and answers set3 examradar. There are six general formats of instructions in 8086 instruction set. Microprocessor tutorial microprocessor introduction types of microprocessors microprocessor architecture instruction set of 8085 programming in 8085 microprocessor applications 8086 microprocessor instruction set of 8086 multiprocessor configuration memory and io interfacing microcontroller peripheral devices.
Data movement instructions in microprocessor 80868088 jc bose. Instruction set of 8086 microprocessor 8086 microprocessor there are 117 basic instruction in the instruction set. How does the cpu identify between 8bit and 16bit operation. Instructions in microprocessor 8086 8088 upon completion of this chapter, you will be able to. Look up table requirements are discussed in detail. Without the xlat instruction, we can accomplish the same with the following. The8080registersarethesameseven 8bitregistersthatwereinthe8008scratchpad namelya,b,c, d,e,h,andl. Datatransfer instructions the datatransfer functions provide the ability to move data. The microprocessor performs different operations on these fields. Register bx is assumed to be pointed to the beginning of the table i. Microprocessor multiple choice questions and answers8086. Add, adc, inc, aaa, daa mnemonic meaning format operation flags affected.
The following is a brief summary of the 8086 instruction set. The 8086 microprocessor is a16bit, nchannel, hmos microprocessor. The control signals for maximum mode of operation are generated by the bus controller chip 8788. Difference between microcontroller and microprocessor, criteria for choosing microcontroller. To design an 8086 based system, it is necessary to know how to interface the 8086 microprocessor with memory and input and output devices. This is the part 1 of the various instruction set for our 8086 microprocessor. This microprocessor had major improvement over the execution speed of 8085.
The intel 8086 high performance 16bit cpu is available in three clock rates. The instruction replaces a byte in the al register with a byte in the memory at bxi, which is one of the data items present in a lookup table. The offset address is calculated by adding the 8 bit contents of the al register and the contents of bx register. Used to translate a byte in al using a table in the memory. Before xlat is executed, the lookup table containing the desired codes. Microprocessor and microcontroller multiple choice questions. Execution of the xlat replaces the contents of al by the contents of the accessed lookuptable location e. Xlat xlatb instruction translate a byte in al xlat exchanges the byte in al register from the user table index to the table entry, addressed by bx. Acs college of engineering department of biomedical engineering. Where the hmos is used for highspeed metal oxide semiconductor. Write a program to convert the string data to its twos complement form. University of nawroz college of engineering computer and communication engineering. Introduction the 8086 trainer kit is built around the intel 8086 microprocessor c pu.
It is the number of bits processed in a single instruction. Design fabrication of an 8086 microprocessor system. It contains simple keypad for interning commands and data, a simple 7 segment display unit for displaying data and result, a monitor program contained in 4k b yte of eprom and 2k b yte. Xlat translate instruction in 8086 microprocessor youtube. For the 8088 8086 address bus is 20 bits wide and it allows the microprocessor to output 2 20 1,048,576 unique addresses. The xlat instruction the translate xlat instruction is used to simplify implementation of the lookuptable operation. As shown in the below figure, the 8086 cpu is divided into two independent functional parts o bus interface unitbiu o execution uniteu dividing the work between these two units speeds up processing. It has a powerful instruction set and it is capable to providing multiplication and division operations directly. Thus, data transfer takes place between register and io device. Select the appropriate assembly language instruction to accomplish a specific data movement task.
The 8086 microprocessor supports 8 types of instructions. Pdf multiple choice questions on 8086 microprocessor. Xlat translate byte using lookup table logical instructions not logical not of. It is the set of instructions that the microprocessor can understand. Difference between microcontroller and microprocessor. Due to the mismatch in the speed between the microprocessor and other. Instruction set of 8086 with microprocessor tutorial, introduction, evolution, working of microprocessor.
Xlat xlat translate replaces a byte in the al register with a byte from a 256 byte, usercoded translation table. Evolution of microprocessor processo r date of launch clock speed data bus width adressbusaddressable memory size 4004 1971 740 khz 4 bit 12 4 kb 8bit processor 8008 1972 800 khz 8 bit 14 16 kb 8080 1974 2 mhz 8 bit 16 64 kb 8085 1976 3 mhz 8 bit 16 64 kb 16bit processor 8086 1978 5 mhz 16 20 1m 80286 1982 16 mhz 16 24 16 m. Data movement instructions in microprocessor 80868088. Data transfer instructions mov move byte or word to register or memory.
118 1476 1701 217 726 941 1434 691 957 747 318 1352 1482 1225 851 1035 164 487 75 89 420 1137