8085 pin configuration pdf

The resulting design includes 8085 cpu, 8251 usart, 32 kib sram, 32 kib or 16 kib rom. Pin configuration of the microprocessor 8085 is shown in figure. 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. In this article you will get to know about the definition, architecture, block diagram and working of 8085 microprocessor. Memory interfacing in 8085 memory structure wait state. Also pins 2 9 can be used as inputs only, while pins 12 19 can be used as either inputs or outputs. Pin diagram and pin description of 8085 microprocessor. The monitor program enables us to enter 8085 instruction using hex digit into the ram.

The signals from the pins can be grouped as follows. Appreciate the detailed explanation of address and data bus. These signals are used to identify the nature of operation. To know the working of 8085 microprocessor, we should know the timing diagram of 8085 microprocessor. This is positive going pulse generated every time the 8085 begins an operation machine cycle. Demultiplexing address and data bus using ale address latch enable. Let us understand 8085 microprocessor architecture with its internal modules or units. The 8085 has extensions to support new interrupts, with three maskable interrupts rst 7. 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. It uses 5v dc supply at v pin 40, and uses ground at v pin 1. Microprocessor 8085 pin configuration electricalvoice. Once decoded, the instruction controls the remainder of the mpu, memory and io through the timing and control block. 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. Microprocessor 8085 pin configuration in microprocessor microprocessor 8085 pin configuration in microprocessor courses with reference manuals and examples pdf.

The minimum mode is a single processor configuration while the maximum mode is a multiple processor configuration. Configuration in microprocessor courses with reference manuals and examples pdf. Sep 18, 2017 the interrupt signal may be given to the processor by any external peripheral device to different interrupts pin in 8085 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. In this article, we will discuss 8085 microprocessor pin configuration or pin diagram of 8085 or external architecture of 8085 microprocessor. The 8085 is an 8bit general purpose microprocessor that can address 64k byte of memory. Learn about the interrupts,maskable and nonmaskable interrupts. Any module could be a processor capable of being a bus. When power up the board, the 8085 fetches the instruction from the memory at location 0000h. Control and status signals these signals are used to identify the nature of operation. Features of 8085 intel 8085 is an 8bit, nmos microprocessor. In bellow the pin configuration of 8085 microprocessor is shown in figure. Data bus ad7ad0, it carries the least significant 8bit address and data bus.

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. Intel 8085 8bit microprocessor intel 8085 is an 8bit, nmos microprocessor. Pin diagram of 8085 and pin description of 8085 free 8085. 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. Microprocessor 8085 pin configuration tutorialspoint. The location from 0000h to 7fffh or 32kb is rom space. Only the pin functions which are unique to maximum mode are described. The intel 8085 eightyeightyfive is an 8bit microprocessor introduced by intel in 1977. Address bus a15a8, it carries the most significant 8bits of memoryio address. Learn about the pin diagram, description of 8085 microprocessor. 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 pins of a 8085 microprocessor can be classified into seven groups. Address bus a8a15 the address bus pins are ranges from a8 to a15 and these are mainly. Microprocessor 8085 pin configuration in microprocessor.

How many output pins are there in microprocessor 8085. Also learn about the various signals used in 8085 microprocessor including instructions such as rim, sim, sid, sod, iom. Projects 8086 pin configuration 80x86 processors transducers 8086 architecture halleffect transducers intel 8085 optical materials bipolar transistors intel 8255 optoelectronic devices thermistors thevenins theorem maximum mode configuration of 8086 system assembly language programme of 80x86 processors power plant. With help of timing diagram we can easily calculate the execution time of instruction as well as program.

Microprocessor 8085 pin configuration in microprocessor tutorial. Before go for timing diagram of 8085 microprocessor we should know some basic parameters to draw timing diagram of 8085 microprocessor. Aug 05, 2019 8085 microprocessor pin diagram explanation pdf 1. Microprocessor 8086 pin configuration tutorialspoint. A15a8, it carries the most significant 8bits of memoryio address.

It reduces the number of components, allows for tweaking the configuration by reprogramming the spld, and provides an introduction to the. It is an appended version of the 8080 microprocessor. Loosely coupled configuration has shared system bus, system memory, and system io. Interrupt structure in 8085 microprocessor electronics. Pin configuration and signal group metafied assembly language program division of two 8bit number in. The entire group of instructions that a microprocessor supports is called instruction set. The 20 lines of the address bus operate in multiplexed mode. Lecture note on microprocessor and microcontroller theory and. The time for the back cycle of the intel 8085 a2 is 200 ns. Instruction set of 8085 an instruction is a binary pattern designed inside a microprocessor to perform a specific function. Draw the pin configuration and functional pin diagram of p 8085.

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 8086 operates in single processor or multiprocessor configuration to achieve high performance. Sep 08, 2017 for the love of physics walter lewin may 16, 2011 duration. Pin diagram of 8086 microprocessor is as given below. The major features of 8085 chip are 8 bit data bus, 16 bit address bus, 3. All the buses data, address, control are tristated.

Pin diagram of 8085 microprocessor is as given below. These types of interrupts in 8085 can be masked using sim instruction. It is a 40 pin dipdual in package ic by intel introduced in 1976. Figure 1 shows the pin diagram of the 8085 microprocessor. Each instruction is represented by an 8bit binary value. Tutorial on introduction to 8085 architecture and programming. The pin configuration and functional pin diagram of. Mar 01, 2018 8085 processor pin diagram explanation. Due to this reason, in the 40 pin ic of 8086 microprocessor, 8 pins i. Pin configuration of 8085 microprocessor electronics. Figure 5pin diagram of 8085 ale address latch enable. Pin diagram and description of 8086 microprocessor.

The intel 8085 is 8 bit size microprocessor produced by intel in the year 1976. The following image depicts the pin diagram of 8085 microprocessor. The following pin function descriptions are for the 80868288 system in maximum mode i. The address bus has 8 signal lines a8 a15 which are. It is very important to know the pin configuration of 8085 microprocessor before study the 8085 microprocessor programming. Minimal 8085 single board computer minimax8085 malinov. The 8085 microprocessor is an 8bit general purpose processor that can deal with the memory of 64k byte. 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 program or the routine that is executed upon interrupt is called interrupt service routine isr. The pins of a 8085 microprocessor can be classified into seven. Types of interrupts in 8085 interrupt structure of 8085.