Ale pin of 8085 microprocessor pdf

Ale pin 30 onthispin8085generatesa pulseinthet1clockofeach. It is a 40 pin c package fabricated on a single lsi chip. The microprocessor 8086 is a 16bit cpu available in different clock rates and packaged in a 40 pin dip or plastic package. Jul 26, 2019 functional units of 8085 microprocessor. Draw the pin diagram of 8085 microprocessor 8085 is a 40 pin 8 bit general purpose microprocessor which operates at 3mhz 5mhz. Explain the function of the ale and iom signals of the. These signals are basically used to control the direction of the data flow between processor and memory or io deviceport.

The most significant 8 bits of the memory address or the 8 bits of the i0 address,3 stated during hold and halt modes. Following are the timing and control signals, which control external and internal circuits. Buses in 8085 demultiplexing and generating control signals. The signals from the pins can be grouped as follows power supply and clock signals address bus data bus control and status signals interrupts and externally initiated signals serial io ports 7. Moorthi published 8085 microprocessor notes find, read and cite all the research you need on researchgate. What is the need for ale signal in 8085 microprocessor. It is a positive going pulse generated when a new operation is started by the microprocessor. Draw the pin configuration and functional pin diagram of p 8085. It is enclosed with 40 pins dip dual in line package.

The pin configuration plays a very important role in understanding the architecture of 8085 microprocessor. What are the requirements to be met while interfacing io devices to. Draw the signal pin diagram configuration of 8085 and explain the purpose of each signals. When high, multiplexed addressdata bus contains address information. Lecture note on microprocessor and microcontroller theory.

For queries regarding questions and quizzes, use the comment area below respective pages. Program written for 8080a will be executed by 8085. These short solved questions or quizzes are provided by gkseries. Tutorial on introduction to 8085 architecture and programming. It is the 3oth pin of 8085 which is used to enable or disable the address bus. 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. This microprocessor, using intel 8085a processor, was assembled from components and was interfaced to take full control of a stepper motor s motion. It is an 8bit microprocessor designed by intel in 1977 using nmos technology. The architecture of 8085 microprocessor is shown in figure given below. In the previous article we saw how ale helps in demultiplexing the lower order address and data bus.

Here, we will describe intel 8085 as it is one of the most popular 8bit microprocessor. Unit1 1 draw and explain the internal architecture of 8085. Explain the function of the ale and iom signals of the 8085. Intel 8085 is an 8bit, nmos microprocessor designed by intel in 1977. The internal logic design of a microprocessor is called architecture which. The architecture of microprocessor 8085 can be divided into seven parts as follows. Test pin goes low, execution will continue, else the processor remains. In intel 8085 microprocessor, ale signal is made high to. Pdf microprocessor 8085 nilesh vengurlekar academia. Its data bus width is 8bit and address bus width is 16bit, thus it can address 216.

The pin configuration and functional pin diagram of. Timing and control unit it provides timing and control signal to the microprocessor to perform operations. The signals from the pins can be grouped as follows. Explain the function of 8085 microprocessor pins i ale. It is the 30th pin of 8085 which is used to enable or disable the address bus. The 8085 has another pin, which helps in demultiplexing these 8 pins. If ale was not present, then the 40 pin processor would have been a 47 pin processor further as we cant put exactly 47 pins on a dip, to maintain symmetry, there would have been some extra useless nc pins i. Mar 22, 2020 8085 microprocessor pin diagram explained. Introduction to microprocessor 6 the 8085 interrupts the 8085 has 5 interrupt inputs. It is 40 pin ic package fabricated on a single lsi chip. V cc hold hlda clkout reset in ready iom s 1 rd ale s 0 a 15 a 14 a a 12 a 11 a 10 a 9 a 8 wr x 1 x 2 reset out sod sid trap rst 7. Microprocessor multiple choice questions and answersintel. It is a single chip nmos device implemented with 6200 transistors. The time for the back cycle of the intel 8085 a2 is 200 ns.

Ad0ad7 are used to fetch opcode and store the lower byte of program counter. Ale rd wr 1, 1, 1 microprocessor control unit generates 74ls353. Ad0ad7 these 8 pins of 8085 are multiplexed, that means on the same 8 pinswires address is sent and after a particular time span, data is sent. Intel 8085 8bit microprocessor intel 8085 is an 8bit, nmos microprocessor. After execution of the new program, microprocessor goes back to the previous. The intel 8085 is an 8bit microprocessor produced by. Chapter 3 the 8085 microprocessor architecture pit. However, the low order bits remain for only one clock period and they would be lost if they are not saved externally. Microprocessor 8085 multiple choice questions and answers for competitive exams. Show the different instruction formats used in 8085. Compare the 8 bit microprocessors 8080a and 8085 8080a is the predecessor of 8085. Enable the data bus to be used as low order address bus.

Microprocessor darshan institute of engineering and technology. List the 16bit registers of 8085 microprocessor 12. The latching of lower half of an address bus is done by using external latch and ale signal from 8085 pin diagram. A microprocessor or 8085 microprocessor is a programmable device that accepts binary data from an input device, processes the data according to the instructions stored in the memory, and provides results as output according to other definitions, the microprocessor is a program executing device, which stored the program in memory and provides the result through output and transfer data. Ale pin in 8085 microproces sor microcontroller microprocessor 8085 intel 8085 is an 8bit microprocessor which has 16 address line for 16bit address of a memory location. To make sure we have the entire address for the full three clock cycles, an external latch save the value of ad7.

Pin diagram of 8085 microprocessor is as given below. The pins serve a particular function in minimum mode single processor mode and other function in maximum mode. Ale rd wr 1, 1, 1 microprocessor control unit generates 74ls353 octal latch ignoring chip select signal. Microprocessor 8085 pin configuration tutorialspoint. Lecture note on microprocessor and microcontroller theory vssut. It is a positive going pulse generated when a new operation is started by. A clock cycle is nothing but the time taken between two adjacent pulses of the oscillator. It has 8 data lines and 16 address lines, out of which 8 address lines are multiplexed with 8 data lines. Notice that in the circuit diagram, the ale signal is connected to the le latch enable pin of the ic.

Ale, address latch enable signal occurring during the t1 state of a mc cycle is used to latch the address into the onchip latch of certain peripherals such as 8155815683558755a. The microprocessor 8086 is a 16bit cpu available in different clock rates and packaged in a 40 pin cerdip or plastic package. This is ale pin which stands for address latch enable. May 04, 2020 also, the ale signal issued by the microprocessor is high, telling that ad0ad7 contains the lower 8 bits of the address. Aug 24, 2015 8085 microprocessor architecture and pin description 1. If you want functional block diagram to see my post 8085 microprocessor and architecture and for busstructure see bus structure of 8085 microprocessor. The following image depicts the pin diagram of 8085 microprocessor. These chips ale input pin is connected to the ale output pin of the 8085 a, thus allowing a direct interface with the 8085 a. The address bus is used to connect with io devices or memory. Object oriented system analysis and design chapter 5. Pin diagram and description of 8085 microprocessor. Jan 03, 2019 ale pin in 8085 microproces sor microcontroller microprocessor 8085 intel 8085 is an 8bit microprocessor which has 16 address line for 16bit address of a memory location. The flag registers of microprocessor 8085 are classified into five types namely sign. Its data bus width is 8bit and address bus width is 16bit, thus it can address 216 64 kb of memory.

In addition, the microprocessor s application to generate and measure waveforms was examined. Enlist the steps followed during memory write cycle in 8085 microprocessor 11. The intel 8085ah is a complete 8bit parallel central processing unit cpu implemented. Address bus a8a15 address bus or data bus ad0ad7 address latch enable ale status signal iom status signals s0s1 active low signal rd. So, to run the microprocessor at 3 mhz, a clock running at 6 mhz should be connected to the x0 and x1 pins. Microprocessor 8085 architecture vande mataram degree college. What is the need for ale signal in 8085 microprocessor 2 2. In 8085 microprocessor, databus and address bus are multiplexed in order to iincrease the speed of microprocessor. Draw and explain the timing diagram of the following instructions. Microprocessor short questions and answers set2 examradar.

These short objective type questions with answers are very important for board exams as well as competitive exams like upsc, nda, ssc etc. Pdf the design and implementation of an intel 8085. Microprocessors 9 8085 microprocessor 8085 is pronounced as eightyeightyfive microprocessor. The 8086 operates in single processor or multiprocessor configuration to achieve high performance. Microprocessor and microcontroller 8085 microprocessor address bus. While the pin goes low, the address is assigned for the memory.

The 8085 is an 8bit general purpose microprocessor that can address 64k byte of memory. Programming with 8085 microprocessor internal architecture of 8 bit microprocessor and its registers. Explain the internal architecture of the 8085 microprocessor. The ale signal is connected to the enable pin of the latch, and the output. It goes high during first t state of a machine cycle and enables the lower 8. The intel 8085 a is a complete 8 bit parallel central processing unit. Pdf an introduction to microprocessor 8085 researchgate. These are op tristate a state of high impedance signals used. Lecture note on microprocessor and microcontroller theory and. The main components of 8085a are array of registers, the arithmetic logic unit, the encoderdecoder, and timing and control circuits linked by an internal data bus.