Pin diagram and pin description of 8085 microprocessor. To generate internal clock signals, 8085 microprocessor requires external inputs from x1 and x2 pins. Computers central processing unit cpu built on a single integrated circuit ic is called a microprocessor. Any module could be a processor capable of being a bus. As some of the architectural drawbacks associated with 8080 was also. Note that the 8086 has data bus width of 16bit, and it is able to address. The 8085 is an 8bit general purpose microprocessor that can address 64k byte of memory.
In this mode, the processor derives the status signal s2, s1, s0. The pin configuration and functional pin diagram of. Pdf lecture notes on microprocessor and microcomputer. Intel 8085 8bit microprocessor intel 8085 is an 8bit, nmos microprocessor. Microprocessor 8085 notes free download as word doc. In bellow the pin configuration of 8085 microprocessor is shown in figure. Let us understand 8085 microprocessor architecture with its internal modules or units. Microprocessor and microcontroller seminar report notes pdf ppt download abstract. Another chip called bus controller derives the control signal using this status information. It is used to know the type of current operation of the microprocessor. The first microprocessor was the intel 4004, introduced in. Memory interfacing in 8085 memory structure wait state. Instruction to microprocessor 54 hrs architecture of 8085 pin diagram of 8085 timing diagram instruction set of 8085 interrupts programming of 8085 interfacing and io ports ppi e.
Multiple microprocessors, working together, are the hearts of datacenters, supercomputers, communications products, and other digital devices. Learn about the pin diagram, description of 8085 microprocessor. Pin diagram of 8085 microprocessor with description 8085 is a general purpose microprocessor having 40 pins and works on single power supply. It is the number of bits processed in a single instruction. The chip select cs signal from the decoder of the microprocessor system is delayed and inverted to clock the latch. To study the various types of instructions provided by 8085 to study the pin diagram and the signals of various pins of 8085. As we have discussed about 8085 microprocessor in earlier sessions, this 8086 microprocessor is an enhanced version of 8085microprocessor that was designed by intel in between 19761978. Mar 16, 2020 in this article, we will discuss 8085 microprocessor pin configuration or pin diagram of 8085 or external architecture of 8085 microprocessor. The address data bus lines are the multiplexed address data bus and contain the right most eight bit of memory address or data. Like the pin configuration of 8085 microprocessor, the 8086 microprocessor also contains 40 pins dual in line however, unlike the 8085 microprocessor, an 8086 to have better performance, operates in 2 modes that are minimum and maximum mode. It can read or write data to a memoryport either 16bits or 8 bit at a time. It is the set of instructions that the microprocessor can understand. Basic concepts of microprocessors differences between. It is directly compatible with 8086 software and 80808085 hardware and peripherals.
The pins of a 8085 microprocessor can be classified into seven groups. It is a 40 pin dipdual in package ic by intel introduced in 1976. It is 40 pin ic package fabricated on a single lsi chip. Cheaper since all control signals for memory and io are generated by the microprocessor. The 8086 operates in single processor or multiprocessor configuration to achieve high performance. Microprocessor types and specifications page 2 of 158 file. The signals from the pins can be grouped as follows. A15a8, it carries the most significant 8bits of memoryio address. The 4004 processor was introduced on november 15, 1971, and originally ran at a clock speed of 108khz 108,000 cycles per second, or just over onetenth a megahertz. Its data bus width is 8bit and address bus width is 16bit, thus it can address 216.
Pin diagram and description of 8086 microprocessor. 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. How many output pins are there in microprocessor 8085. Microprocessor overview 8086 in microprocessor tutorial 04.
Unit i introduction to intel microprocessor 8086 overview of. It is an appended version of the 8080 microprocessor. The 8085 has extensions to support new interrupts, with three maskable interrupts rst 7. The pins of the microprocessor, or any chip for that matter, carry electrical signals in and out of the chip to allow it to function in a system. Demultiplexing address and data bus using ale address latch enable. The time for the back cycle of the intel 8085 a2 is 200 ns. In this article, we will discuss 8085 microprocessor pin configuration or pin diagram of 8085 or external architecture of 8085 microprocessor. Jun 26, 2014 pin specification of 8086 microprocessor 1. Maximum mode 8086 system here, either a numeric coprocessor of the type 8087 or another processor is interfaced with 8086. These minimum or maximum operations are decided by the pin mn mx active low.
Also includes some projects that have been worked upon and also episodes to embedded system podcast. Minimal 8085 single board computer minimax8085 malinov. But in the maximum mode the 8086 can work in multiprocessor or coprocessor configuration. It is a 16bit microprocessor used as cpu in a microprocessor possessing 20 address lines and16 data lines that supports up to 1mb storage. Microprocessor8086 instruction set central processing. Ee8551 and ee6502 for eee dept unit 1 8085 processor hardware architecture of 8085 microprocessor pin diagram of 8085 microprocessor memory interfacing of 8085 microprocessor timing diagram and machine cycles of 8085 microprocessor interrupts and types of interrupts in 8085 microprocessor hardware architecture of 8086 microprocessor 8086minimum mode of. The microprocessor, also known as the central processing unit cpu, is the brain of all computers and many household and electronic devices. Pin diagram and pin description of 8086 microprocessor the following pin function descriptions are for the microprocessor 8086 in either minimum or maximum mode. The micro processor has the following functions of data storage, interaction with other peripheral devices and other time related functions. The following image depicts the pin diagram of 8085 microprocessor. Let us take a look at the changes between 8085 series of microprocessors and 8086 series of microprocessors.
These x1 and x2 pins are also called crystal input pins. It is directly compatible with 8086 software and 8080 8085 hardware and peripherals. Pin configuration of the microprocessor 8085 is shown in figure. The components in the system are same as in the minimum mode system. It reduces the number of components, allows for tweaking the configuration by reprogramming the spld, and provides an introduction to the. Intel 8086 microprocessor is the enhanced version of intel 8085 microprocessor. The busy pin of 8087 is connected to this pin of 8086.
This microprocessor had major improvement over the execution speed of 8085. 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. The chapter wise class notes of microprocessors in pdf files listed below are compiled by er. It responds to a specific set of instructions in a welldefined manner. The processor has attributes of both 8and 16bit microprocessors. This tristate bidirectional buffer is used to interface the internal data bus of 8255 pin. Address data bus these lines constitute the time multiplexed memoryio address during the first clock cycle t1 and data during t2, t3 and t4 clock cycles. Pin configuration of 8085 microprocessor electronics. Notes microprocessor 8085 pdf microprocessors and microcontrollersarchitecture of microprocessors. Mar 15, 20 pin number 12 to 19 are used for data bus in microprocessor. Figure 1 shows the pin diagram of the 8085 microprocessor. Ad7ad0, it carries the least significant 8bit address and data bus. What is the pin diagram and function of each pin of 8085. A digital computer with one microprocessor which acts as a cpu is called microcomputer.
Where the hmos is used for highspeed metal oxide semiconductor. The ready pin on the 8085 microprocessor is used to delay the completion of a bus transfer cycle. Aug 19, 2016 8086 pin confinguration power supply and frequency signals. It is sampled by the 8085 at the falling edge of clock following ale.
Differences between 8085 and 8086 microprocessor in the changing world of technologies, the devices used are also changing. The major features of 8085 chip are 8 bit data bus, 16 bit address bus, 3. The memory, address bus, data buses are shared resources. Its alu, internal registers works with 16bit binary word 8086 has a 16bit data bus. For both high and low states, the output q draws a current from the input of the or gate. Moinul hoque, lecturer, dept of cse, aust 16bit microprocessor. Pin description of 8085 contd page2 the microprocessor is a clockdriven semiconductor device consisting of electronic logic circuits manufactured by using either a largescale integration lsi or verylargescale integration vlsi technique. The resulting design includes 8085 cpu, 8251 usart, 32 kib sram, 32 kib or 16 kib rom. These signals are used to identify the nature of operation. Microprocessormicrocontroller the first microprocessor to make it into a home computer was the intel 8080, a complete 8bit computer on one chip. Microprocessor 8085 pin configuration electricalvoice. The internal block diagram and the pin configuration of dac0808 are shown in figure below. The following pin function descriptions are for the microprocessor 8086 in either minimum or maximum mode.
Pin diagram of 8085 microprocessor with description. The address and data bits are separated by using ale signal. This signal is a pulse that become 1 when the ad0 ad7 lines have an address on them. Appreciate the detailed explanation of address and data bus. Pin diagram of 8085 and pin description of 8085 free 8085. The microprocessor 8086 is a 16bit cpu available in different clock rates and packaged in a 40 pin dip or plastic package. Microprocessor 8085 architecture in microprocessor.
In the maximum mode, there may be more than one microprocessor in the system configuration. If low, execution continues else microprocessor is in. It is a 40 pin c package fabricated on a single lsi chip. Pin diagram of 8085 microprocessor is as given below. Microprocessor 8086 pin configuration tutorialspoint. When the signal on this pin is low for at least 3 clocking cycles, it forces the microprocessor to reset itself. It determines the number of operations per second the processor can perform. Also learn about the various signals used in 8085 microprocessor including instructions such as rim, sim, sid, sod, iom. Memory is an integral part of a microprocessor system, and in this section, we will discuss how to interface a memory device with the microprocessor.
It operates on 8bit data and uses 16bit address to access the memory. Microprocessors and microcontrollers ee8551, ec8691. Its data bus width is 8bit and address bus width is 16bit, thus it can address 216 64 kb of memory. Draw the pin configuration and functional pin diagram of p 8085. Learn about the interrupts,maskable and nonmaskable interrupts. The memory interfacing in 8085 is used to access memory quite frequently to. It is a programmable, multipurpose, clock driven, registerbased electronic device that reads binary instructions from a storage device called. The dac0800 can be interfaced to 8085 system through an 8bit latch as shown in figure below. With the help of 16bit address, 8085 can access 216 65536 64k memory locations. Complete notes of microprocessor with tutorials and solutions. Microcomputer a computer with a microprocessor as its cpu. In the minimum mode of operation the microprocessor do not associate with any coprocessors and can not be used for multiprocessor systems. It uses 5v dc supply at vcc pin 40, and uses ground at vss pin 1 and 20 for its operation. The pins serve a particular function in minimum mode single processor mode and other function in maximum mode.
The 8086 microprocessor is a16bit, nchannel, hmos microprocessor. Each pin has a specific function and the data sheet for the chip will describe each. It is a chip that has all the functions of the cpu of a computer. It is an 8bit microprocessor which was introduced by intel in the year 1976 using nmos technology. Microprocessor 8085 pin configuration tutorialspoint. Loosely coupled configuration has shared system bus, system memory, and system io.
Microprocessor 8086 free download as powerpoint presentation. It uses a gal16v8 atf16v8 simple programmable logic device spld instead of discrete logic ics for the address decode and the frequency divider for usart. Feb 04, 2012 the blog talks about variety of topics on embedded system, 8085 microprocessor, 8051 microcontroller, arm architecture, c2000 architecture, c28x, avr and many many more. Click on corresponding chapter to view related notes.
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