The 5 means it is a single power supply 5 volt version of the 8080, with enhancements. The address and data bus are multiplexed in this processor which helps in providing more control signals. The six generalpurpose registers are used to store 8bit data. Pin diagram of 8086 microprocessor is as given below.
Pin description of 8085contd 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. Clk outputclock output is used as the system clock for peripheral and devices interfaced with the microprocessor. The following image depicts the pin diagram of 8085 microprocessor. It represents the execution time taken by each instruction in a graphical format. Lecture note on microprocessor and microcontroller theory.
Its data bus width is 8bit and address bus width is 16bit, thus it can address 216 64 kb of memory. What is the pin diagram and function of each pin of 8085. Unit1 introduction to 8086 ece department microprocessors and microcontrollers page 2 iv address bus. In this article you will get to know about the definition, architecture, block diagram and working of 8085 microprocessor. The time for the back cycle of the intel 8085 a2 is 200 ns. Pin diagram of intel 8085 microprocessor sreejith hrishikesan july 01, 2019. This article discusses what is a 8085 microprocessor, pin configuration of 8085, which includes address bus, interrupts, rd, wr, ready, hold, hlda, intr. Pin diagram of 8085 microprocessor introduction to microprocessor computer science class 12 duration. Pin diagram of 8085 microprocessor is as given below. Pin diagram and pin description of 8085 microprocessor. Apr 28, 2020 pin diagram of 8085 microprocessor computer science engineering cse video edurev is made by best teachers of computer science engineering cse.
Normally, this microcontroller was developed using nmos technology, which requires more power to operate. It is a 40 pin c package fabricated on a single lsi chip. In each instruction, programmer has to specify 3 things. Before go for timing diagram of 8085 microprocessor we should know some basic parameters to draw timing diagram of 8085 microprocessor. Pin diagram of intel 8085 microprocessor electronics and. The photo image is shown in figure and pin diagram is shown in figure. Draw and explain the internal architecture of 8085. This is the functional block diagram of the 8085 microprocessor. Detailed explanation of pin description of 8085 microprocessor. To know the working of 8085 microprocessor, we should know the timing diagram of 8085 microprocessor. Pin diagram of 8085 microprocessor computer science. The 20 lines of the address bus operate in multiplexed mode. It is a 8bit register which is used to perform airthmetical and logical operation.
The ready pin on the 8085 microprocessor is used to delay the completion of a bus transfer cycle. This processor can be built with electronic logic circuits that are fabricated using the technologies like vlsi very large scale integration or lsi large scale integration. Microprocessor 8085 pin configuration tutorialspoint. Draw the pin configuration and functional pin diagram of.
On these lines the cpu sends out the address of the memory location that is to be written to or read from. Draw the signal pin diagram configuration of 8085 and explain the purpose of each signals. The 8085 microprocessor is an 8bit generalpurpose microprocessor having 40 pins which is capable of addressing 64 kb of memory. The pin diagram and applications of 8051 microcontroller. Features of 8085 intel 8085 is an 8bit, nmos microprocessor. To perform addition of two 8 bit numbers using 8085. What is meant by the statement that 8085 is a 8bit microprocessor. The signals are classified into the following categories. Addressing modes of 8085 to perform any operation, we have to give the corresponding instructions to the microprocessor. Thus the pin diagram and signals of 8085 microprocessor are explained in detail. A15a8, it carries the most significant 8bits of memoryio address. When the signal on this pin is low for at least 3 clocking cycles, it forces the microprocessor to reset itself.
The 8085 is an 8bit general purpose microprocessor that can address 64k byte of memory. To study the pin diagram we group the signals into 5 categories. Nta is not an interrupt, it is used by the microprocessor for sending acknowledgement. The pin configuration and functional pin diagram of. Microprocessor 8085 pin configuration the following image depicts the pin diagram of 8085 microprocessor. 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. With neat pin diagram explain the various signals of 8085 microprocessormay04 pin definitions of 8085 the signals of 8085 can be classified into six. Pin diagram of 8085 microprocessor with description. The 8051 microcontroller is one of the basic type of microcontroller, designed by intel in 1980s. The pins of a 8085 microprocessor can be classified into seven groups. The serial data on this pin delivers its output to the seventh bit of the accumulator when sim instruction is executed. The 8085 in the 8085 microprocessor is the designation given to the microprocessor by intel.
This video is highly rated by computer science engineering cse. It consists of data bus buffer, control logic and group a and group b controls. This tristate bidirectional buffer is used to interface the internal data bus of 8255 pin diagram to the system data bus. This is the function al block diagram of 8085 microprocessor.
Ad7ad0, it carries the least significant 8bit address and data bus. Pin diagram of 8085 and pin description of 8085 free 8085. Each instruction of the 8085 processor consists of one to five machine cycles, i. Interrupt service routine isr a small program or a routine that. It is sampled by the 8085 at the falling edge of clock following ale. Introduction to instruction set for 8085 microprocessor duration. 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. Introduction to microprocessor 6 the 8085 interrupts the 8085 has 5 interrupt inputs. It contains well written, well thought and well explained computer science and programming articles. The address bus consists of 16, 20, 24, or more parallel signal lines. There are 5 interrupt pins in 8085 used as hardware interrupts, i. 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. This microcontroller was based on harvard architecture and developed primarily for use in embedded systems technology.
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