What is meant by the statement that 8085 is a 8bit microprocessor. The signals are classified into the following categories. This tristate bidirectional buffer is used to interface the internal data bus of 8255 pin diagram to the system data bus. To perform addition of two 8 bit numbers using 8085. Pin diagram of 8085 and pin description of 8085 free 8085. Thus the pin diagram and signals of 8085 microprocessor are explained in detail.
It is a 8bit register which is used to perform airthmetical and logical operation. Pin diagram of 8085 microprocessor with description. Nta is not an interrupt, it is used by the microprocessor for sending acknowledgement. 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. 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. To study the pin diagram we group the signals into 5 categories. Interrupt service routine isr a small program or a routine that. It is a 40 pin c package fabricated on a single lsi chip. Unit1 introduction to 8086 ece department microprocessors and microcontrollers page 2 iv address bus. Introduction to instruction set for 8085 microprocessor duration.
Pin diagram of intel 8085 microprocessor sreejith hrishikesan july 01, 2019. Microprocessor 8085 pin configuration the following image depicts the pin diagram of 8085 microprocessor. Microprocessor 8085 pin configuration tutorialspoint. 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. The 5 means it is a single power supply 5 volt version of the 8080, with enhancements. It is sampled by the 8085 at the falling edge of clock following ale. It contains well written, well thought and well explained computer science and programming articles. 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. Timing diagrams of 8085 free 8085 microprocessor lecture.
The pins of a 8085 microprocessor can be classified into seven groups. Lecture note on microprocessor and microcontroller theory. Each instruction of the 8085 processor consists of one to five machine cycles, i. Normally, this microcontroller was developed using nmos technology, which requires more power to operate. The ready pin on the 8085 microprocessor is used to delay the completion of a bus transfer cycle. The photo image is shown in figure and pin diagram is shown in figure. The microprocessor 8086 is a 16bit cpu available in different clock rates and packaged in a 40 pin cerdip or plastic 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. The time for the back cycle of the intel 8085 a2 is 200 ns. The 8085 microprocessor is an 8bit generalpurpose microprocessor having 40 pins which is capable of addressing 64 kb of memory. The 8085 is an 8bit general purpose microprocessor that can address 64k byte of memory. On these lines the cpu sends out the address of the memory location that is to be written to or read from. The 8085 in the 8085 microprocessor is the designation given to the microprocessor by intel. There are 5 interrupt pins in 8085 used as hardware interrupts, i. Pin diagram and pin description of 8085 microprocessor. This is the functional block diagram of the 8085 microprocessor. With help of timing diagram we can easily calculate the execution time of instruction as well as program. Detailed explanation of pin description of 8085 microprocessor. The six generalpurpose registers are used to store 8bit data. Its data bus width is 8bit and address bus width is 16bit, thus it can address 216 64 kb of memory. This microcontroller was based on harvard architecture and developed primarily for use in embedded systems technology.
It consists of data bus buffer, control logic and group a and group b controls. Features of 8085 intel 8085 is an 8bit, nmos microprocessor. In each instruction, programmer has to specify 3 things. Draw the pin configuration and functional pin diagram of p 8085. This video is highly rated by computer science engineering cse. Draw the signal pin diagram configuration of 8085 and explain the purpose of each signals. The serial data on this pin delivers its output to the seventh bit of the accumulator when sim instruction is executed. 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.
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. The 20 lines of the address bus operate in multiplexed mode. View notes draw and explain the internal architecture of 8085. Pin diagram of 8086 microprocessor is as given below. It represents the execution time taken by each instruction in a graphical format. The address bus consists of 16, 20, 24, or more parallel signal lines. Pin diagram of 8085 microprocessor computer science. What is the pin diagram and function of each pin of 8085. Pin diagram of intel 8085 microprocessor electronics and. Before go for timing diagram of 8085 microprocessor we should know some basic parameters to draw timing diagram of 8085 microprocessor. This is the function al block diagram of 8085 microprocessor. Introduction to microprocessor 6 the 8085 interrupts the 8085 has 5 interrupt inputs.
Ad7ad0, it carries the least significant 8bit address and data bus. 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. Pin diagram of 8085 microprocessor is as given below. Draw the pin configuration and functional pin diagram of.
The pin configuration and functional pin diagram of. When the signal on this pin is low for at least 3 clocking cycles, it forces the microprocessor to reset itself. The address and data bus are multiplexed in this processor which helps in providing more control signals. Addressing modes of 8085 to perform any operation, we have to give the corresponding instructions to the microprocessor. The pin diagram and applications of 8051 microcontroller. In this article you will get to know about the definition, architecture, block diagram and working of 8085 microprocessor.
636 1516 1317 634 1205 465 960 931 380 881 323 1199 502 1078 1353 904 503 1516 217 503 941 1518 496 116 280 66 580 122 193 807 1305 421