8085 pin configuration pdf

Loosely coupled configuration has shared system bus, system memory, and system io. Let us understand 8085 microprocessor architecture with its internal modules or units. Also pins 2 9 can be used as inputs only, while pins 12 19 can be used as either inputs or outputs. The pins of a 8085 microprocessor can be classified into seven. All the buses data, address, control are tristated. Data bus ad7ad0, it carries the least significant 8bit address and data bus. Pin diagram and pin description of 8085 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. With help of timing diagram we can easily calculate the execution time of instruction as well as program. The time for the back cycle of the intel 8085 a2 is 200 ns. Minimal 8085 single board computer minimax8085 malinov. Pin configuration and signal group metafied assembly language program division of two 8bit number in. Aug 08, 2018 due to this, 8085 starts execution of instructions from address 003ch which is the starting address of an interrupt service routine for rst 7. The intel 8085 is 8 bit size microprocessor produced by intel in the year 1976.

Due to this reason, in the 40 pin ic of 8086 microprocessor, 8 pins i. Learn about the interrupts,maskable and nonmaskable interrupts. 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. Tutorial on introduction to 8085 architecture and programming. 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. Only the pin functions which are unique to maximum mode are described. Pin configuration of the microprocessor 8085 is shown in figure. 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.

Sep 08, 2017 for the love of physics walter lewin may 16, 2011 duration. Memory interfacing in 8085 memory structure wait state. Demultiplexing address and data bus using ale address latch enable. Figure 5pin diagram of 8085 ale address latch enable. The pins serve a particular function in minimum mode single.

How many output pins are there in microprocessor 8085. Configuration in microprocessor courses with reference manuals and examples pdf. The 8085 has extensions to support new interrupts, with three maskable interrupts rst 7. In bellow the pin configuration of 8085 microprocessor is shown in figure. Address bus a15a8, it carries the most significant 8bits of memoryio address. Address bus a8a15 the address bus pins are ranges from a8 to a15 and these are mainly. Instruction set of 8085 an instruction is a binary pattern designed inside a microprocessor to perform a specific function. Intel 8085 8bit microprocessor intel 8085 is an 8bit, nmos microprocessor. 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 monitor program enables us to enter 8085 instruction using hex digit into the ram. This is positive going pulse generated every time the 8085 begins an operation machine cycle.

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. Ad7ad0, it carries the least significant 8bit address and data bus. Any module could be a processor capable of being a bus. The program or the routine that is executed upon interrupt is called interrupt service routine isr. Mar 01, 2018 8085 processor pin diagram explanation. These types of interrupts in 8085 can be masked using sim instruction.

The minimum mode is a single processor configuration while the maximum mode is a multiple processor configuration. The pins of a 8085 microprocessor can be classified into seven groups. Interrupt structure in 8085 microprocessor electronics. Microprocessor 8085 pin configuration in microprocessor. To know the working of 8085 microprocessor, we should know the timing diagram of 8085 microprocessor. It is a 40 pin c package fabricated on a single lsi chip. Control and status signals these signals are used to identify the nature of operation. Before go for timing diagram of 8085 microprocessor we should know some basic parameters to draw timing diagram of 8085 microprocessor. In this article you will get to know about the definition, architecture, block diagram and working of 8085 microprocessor. Lecture note on microprocessor and microcontroller theory and. The 20 lines of the address bus operate in multiplexed mode. Figure 1 shows the pin diagram of the 8085 microprocessor.

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. Once decoded, the instruction controls the remainder of the mpu, memory and io through the timing and control block. 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. The following pin function descriptions are for the 80868288 system in maximum mode i. Microprocessor 8086 pin configuration tutorialspoint. The following image depicts the pin diagram of 8085 microprocessor. Each instruction is represented by an 8bit binary value. Appreciate the detailed explanation of address and data bus. When power up the board, the 8085 fetches the instruction from the memory at location 0000h. Microprocessor 8085 pin configuration electricalvoice. The 8085 microprocessor is an 8bit general purpose processor that can deal with the memory of 64k byte. Aug 05, 2019 8085 microprocessor pin diagram explanation pdf 1.

Pin diagram of 8085 microprocessor is as given below. Microprocessor 8085 pin configuration in microprocessor microprocessor 8085 pin configuration in microprocessor courses with reference manuals and examples pdf. Pin configuration of 8085 microprocessor electronics. It is a 40 pin dipdual in package ic by intel introduced in 1976. The details of each pin connected with this block are described below, chip select a low on this input pin enables the communication between the 8085 and mpu. The 8086 operates in single processor or multiprocessor configuration to achieve high performance. The major features of 8085 chip are 8 bit data bus, 16 bit address bus, 3. Also learn about the various signals used in 8085 microprocessor including instructions such as rim, sim, sid, sod, iom. Types of interrupts in 8085 interrupt structure of 8085. The entire group of instructions that a microprocessor supports is called instruction set. It reduces the number of components, allows for tweaking the configuration by reprogramming the spld, and provides an introduction to the. Pin diagram of 8085 and pin description of 8085 free 8085. These signals are used to identify the nature of operation. It is very important to know the pin configuration of 8085 microprocessor before study the 8085 microprocessor programming.

The resulting design includes 8085 cpu, 8251 usart, 32 kib sram, 32 kib or 16 kib rom. It is an appended version of the 8080 microprocessor. The location from 0000h to 7fffh or 32kb is rom space. The address bus has 8 signal lines a8 a15 which are. The intel 8085 eightyeightyfive is an 8bit microprocessor introduced by intel in 1977. Mc6800 microprocessor 8212 block diagram dice op200 microprocessor 8085 application mc6800 pin diagram op07 dac8043 ad5443 op77 text. A15a8, it carries the most significant 8bits of memoryio address. 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. The 8085 is an 8bit general purpose microprocessor that can address 64k byte of memory. Learn about the pin diagram, description of 8085 microprocessor. Microprocessor 8085 pin configuration in microprocessor tutorial. Pin diagram of 8086 microprocessor is as given below. Features of 8085 intel 8085 is an 8bit, nmos microprocessor.