In program 1, direct addressing instructions are used, whereas in program 2. about 8085 microprocessor 4 an 8bit microprocessor produced by intel and introduced in 1976. the block diagram consists of 8 blocks which are data bus buffer, readwrite logic, cascade buffer comparator, control logic, priority resolver and 3 registers isr, irr, imr. In 1978, intel released the 8086 microprocessor, a year later it released 8088. Microprocessor architecture the microprocessor is the central processing unit or cpu of a micro computer. Processing unit consists of alu, accumulator, status flags and temporary register. Note for microprocessor mp by annapurna mishra lecturenotes. Its data bus width is 8bit and address bus width is 16bit, thus it can address 216 64 kb of memory. in this video, i have explained block diagram of 8085 microprocessor by following outlines. Basically, 8085 was the first commercially successful microprocessor by intel. Explain the opcode fetch and memory read machine cycles for mvi a, 48h with timing for execution diagram. With neat pin diagram explain the various signals of. Explain the 8085 microprocessor signals with block diagram. Pdf intel 8085 microprocessor architecture anurudh kashya. Initially, the instructions are stored in the memory in a sequential order. The schematic representation of the 8085 bus structure is as shown in fig. Block diagram of computer with microprocessor as a cpu. Explain in detail with a neat diagram the internal architecture of 8255 pio. There are 6 general purpose registers in 8085 processor, i. Lecture note on microprocessor and microcontroller theory vssut. In addition to the above mentioned registers intel. The arithmetic and logic unit, alu performs the arithmetic and logical operations. It is an 8bit microprocessor designed by intel in 1977 using nmos technology. Internal architecture of 8 bit microprocessor and its registers. The main components of 8085a are array of registers, the arithmetic logic unit, the encoderdecoder, and timing and control circuits linked by an internal data bus. The microprocessor is one of most known subject is computer engineering branch. Functional block diagram of 8085 microprocessor the accumulator is an 8bit register that is a part of arithmeticlogic unit alu. Nta is not an interrupt, it is used by the microprocessor for s. From the above description, we can draw the following block diagram to.

8085 microprocessor architecture pdf