These x1 and x2 pins are also called crystal input pins. Pin diagram and description of 8086 microprocessor. Pin diagram of 8085 and pin description of 8085 free 8085. Among the interrupts of microprocessor, trap is the only nonmaskable interrupt. 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. This microprocessor exhibits some unique characteristics and this is the reason it still holds popularity among the microprocessors basically, 8085 was the first commercially successful microprocessor by intel. The reason for the difference is that some actually most instructions have multiple different formats. Pin diagram of 8085 microprocessor with description 8085 is a general purpose microprocessor having 40 pins and works on single power supply. Pin configuration of 8085 microprocessor electronics. Intel 8085 8bit microprocessor intel 8085 is an 8bit, nmos microprocessor. The address and data bus are multiplexed in this processor which helps in providing more control signals.
Let us understand 8085 microprocessor architecture with its internal modules or units. It is a 40 pin c package fabricated on a single lsi chip. Each instruction is represented by an 8bit binary value. The 8085 machine language the 8085 from intel is an 8bit microprocessor. Pin diagram of 8085 microprocessor is as given below. Its data bus width is 8bit and address bus width is 16bit, thus it can address 216 64 kb of memory. Microprocessor 8085 architecture in microprocessor. The pins of a 8085 microprocessor can be classified into seven groups. Tutorial on introduction to 8085 architecture and programming.
Pin configuration of the microprocessor 8085 is shown in figure. 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. To generate internal clock signals, 8085 microprocessor requires external inputs from x1 and x2 pins. Loosely coupled configuration has shared system bus, system memory, and system io. The 8085 has extensions to support new interrupts, with three maskable interrupts rst 7. Lecture note on microprocessor and microcontroller theory. The serial data on this pin is loaded into the seventh bit of the accumulator when rim instruction is executed. It determines the number of operations per second the processor can perform. The time for the back cycle of the intel 8085 a2 is 200 ns.
A15a8, it carries the most significant 8bits of memoryio address. How many output pins are there in microprocessor 8085. As some of the architectural drawbacks associated with. 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. Draw the pin configuration and functional pin diagram of p 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 major features of 8085 chip are 8 bit data bus, 16 bit address bus, 3. Microprocessor 8085 pin configuration tutorialspoint. It is the set of instructions that the microprocessor can understand. Actually it is known as update of the 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. The following image depicts the pin diagram of 8085 microprocessor. Figure 1 shows the pin diagram of the 8085 microprocessor.
Before go for timing diagram of 8085 microprocessor we should know some basic parameters to draw timing diagram of 8085 microprocessor. Any module could be a processor capable of being a bus. Microprocessor 8085 pin configuration electricalvoice. Chapter 2 8085 microprocessor 2549 introduction 25. Sc cs iv semester microprocessor and its applications unit i introduction to microprocessor evolution of microprocessor general architecture of microprocessor system architecture of 8085 a pin configuration machine language and assembly language.
The signals from the pins can be grouped as follows. Pin diagram of 8086 microprocessor is as given below. To know the working of 8085 microprocessor, we should know the timing diagram of 8085 microprocessor. It is an 8bit microprocessor which was introduced by intel in the year 1976 using nmos technology.
With help of timing diagram we can easily calculate the execution time of instruction as well as program. It is directly compatible with 8086 software and 80808085 hardware and peripherals. Instruction set of 8085 an instruction is a binary pattern designed inside a microprocessor to perform a specific function. It is the number of bits processed in a single instruction. Pin diagram of 8085 microprocessor with description.
The 20 lines of the address bus operate in multiplexed mode. The processor has attributes of both 8and 16bit microprocessors. Ad7ad0, it carries the least significant 8bit address and data bus. The pin configuration and functional pin diagram of. The 8085 uses a total of 246 bit patterns to form its instruction set.