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The document summarizes the bus architecture and control signals of the Intel 8086/8088 microprocessors. It describes the 20-line address bus and 16-bit or 8-bit data bus depending on the specific chip. It also outlines the control signals for memory access and other functions. Maximum and minimum modes are discussed which change the control structure and allow compatibility with 8-bit peripherals. The 8288 clock generator chip is mentioned as providing the necessary control signals when the 8086 is in maximum mode with an external coprocessor.
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8086 architecture
The document discusses the 8086/8088 microprocessors. It describes their basic features, including being 16-bit microprocessors introduced in 1978/1979 and using HMOS technology. It also covers their pin configurations and diagrams, addressing modes, minimum and maximum modes, and descriptions of the various pins and signals.
8086 architecture
The document discusses the 8086/8088 microprocessors. It introduces their basic features, including being 16-bit processors manufactured using HMOS technology. It provides pinout diagrams showing the 40-pin package and labeling of the pins. It describes the 8088 having an 8-bit data bus while the 8086 has a 16-bit data bus. It also explains the minimum and maximum modes the processors can operate in.
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Microprocessor systems 8085
Microprocessor systems 8085Quaid-e-Awam University of Engineering Science and Technology Nawabshah Sindh Pakistan
The document discusses the Intel 8086 microprocessor. It provides details about its introduction, architecture, registers, addressing modes, and operation. Specifically:
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This document discusses the opcode fetch cycle of the 8085 microprocessor. It contains timing diagrams and explanations of how the microprocessor generates control signals to fetch opcodes from memory. It shows how the 8085 demultiplexes the address and data buses to access specific memory locations and place the fetched opcode on the data bus. Control signals like IO/M, RD, ALE are generated and used to latch the lower order address and retrieve the opcode byte from the addressed memory location during fetch.
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The 8279 is a programmable keyboard and display interfacing chip that can interface with up to a 64-key matrix keyboard and control up to a 16-digit multiplexed display. It has sections for keyboard scanning, display control, scan generation, and an MPU interface. The keyboard and display sections utilize scan lines to multiplex rows and columns to read key presses and update display segments.
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Datasheet 89S8253.pdf
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The 8155 and 8156 microprocessor interface chips differ in that the 8155 has an active low Chip Enable (CE) signal, while the 8156 has an active high CE signal. The 8155 is a multifunction chip that contains RAM, I/O ports, and a timer. It has two 8-bit I/O ports, one 6-bit I/O port, a 14-bit counter/timer, 2Kb of RAM, and can be interfaced with the 8085 microprocessor. The document then provides details on the pinout, memory mapping, control register, port configurations, timer operation modes, and status register of the 8155 chip.
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The Intel 8255 Programmable Peripheral Interface (PPI) chip contains three 8-bit ports (Port A, Port B, and Port C) that can be configured for input or output. It operates in either Bit Set/Reset (BSR) mode or Input/Output (I/O) mode. In BSR mode, individual pins of Port C can be set or reset. In I/O mode, the ports support three modes - Simple I/O (Mode 0), Strobed I/O (Mode 1), or Strobed Bi-directional I/O (Mode 2). The control register is used to configure the ports and select the operating mode.
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The 8255 PPI (Programmable Peripheral Interface) chip is used to interface I/O devices with microprocessors. It has 3 ports (A, B, and C) that are programmable and can operate in 3 different modes to handle input, output, and bidirectional data transfer with handshaking. Port C pins also act as handshake signals for ports A and B depending on the mode. The control word written to the 8255's control register determines which ports are inputs/outputs and the operating mode.
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Application of 8086 and 8085 Microprocessor in Robots.pptx
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The 8086 microprocessor is a 16-bit processor released by Intel in 1978. It has approximately 29,000 transistors and a 40-pin DIP package. The 8086 uses separate 16-bit registers to address up to 1 megabyte of memory across four segments of 64KB each. It can operate in minimum or maximum mode depending on the state of the MN/MX pin. The 8086 has an execution unit that executes instructions fetched by the bus interface unit, which handles fetching from memory and I/O.
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The document discusses various topics related to microprocessors and computer architecture. It begins by providing details about the pins and functions of the 8085 microprocessor. It then discusses interfacing memory chips with the 8085 and provides an example. Next, it describes the block diagram and functions of the different units of the 8086 microprocessor. It also explains the different addressing modes used in 8086 with examples. The document then discusses the control word format for programming the I/O ports of the 8255 chip. In less than 3 sentences.
8086 MICROPROCESSOR
The 8086 microprocessor was Intel's first 16-bit microprocessor released in 1978. It had several improvements over previous processors including being 16-bit instead of 8-bit, having an instruction queue to improve performance, and supporting segmented memory addressing to access more than 64KB of memory. The 8086 had a 16-bit external data bus, 20-bit address bus, and could address up to 1MB of memory. It operated at clock speeds between 5-10MHz and had around 29,000 transistors.
8086 microprocessor
The 8086 microprocessor is Intel's first 16-bit microprocessor, released in 1978. It has approximately 29,000 transistors, operates at 5V, and can address up to 1 megabyte of memory using 20 address lines. The 8086 uses separate 16-bit registers to access up to four segments of memory or I/O space at a time. It can operate in minimum or maximum mode depending on the state of the MN/MX pin, with maximum mode allowing bus sharing with other devices.
8085-microprocessor
The document discusses the evolution of microprocessors from 1971 to present. It begins with Intel releasing the first microprocessor, the 4-bit 4004, in 1971. The document then outlines the progression from 4-bit to 8-bit to 16-bit and finally 32-bit and 64-bit microprocessors. It provides details on the features of early microprocessors like the 8008, 8080, 8085 and later models like the 8086, 80286, 80386 and Pentium. The number of transistors integrated onto a single chip doubled every 18 months, as predicted by Moore's Law.
8086.pptx
The 8086 microprocessor is Intel's first 16-bit microprocessor released in 1978. It has approximately 29,000 transistors, operates at 5V, and can address up to 1 megabyte of memory space through its 20-bit address bus. The 8086 uses separate 16-bit address spaces for memory and I/O devices and can operate in minimum or maximum modes depending on the state of its MN/MX pin. It has an execution unit that performs arithmetic and logic operations and a bus interface unit that fetches instructions and data from memory and I/O ports.
Microprocessor 8086 nitin_p
The 8086 microprocessor is Intel's first 16-bit microprocessor. It has a 16-bit data bus and 20-bit address bus, allowing it to access up to 1MB of memory. The 8086 uses segmented memory architecture, dividing memory into segments of up to 64KB addressed through segment registers. It has on-chip registers for code, data, stack, and one extra segment. The 8086's execution and bus interface units operate in parallel via an instruction queue, enabling pipelined processing.
Microprocessor 8086 8087_nitin ahire
The 8086 microprocessor is Intel's first 16-bit microprocessor. It has a 16-bit data bus and 20-bit address bus, allowing it to access up to 1MB of memory. The 8086 uses segmented memory architecture, dividing memory into segments of up to 64KB addressed through segment registers. It has on-chip registers for code, data, stack, and one extra segment. The 8086's execution and bus interface units operate in parallel via an instruction queue, enabling pipelined processing.
UNIT-II-8086.pptx
The document discusses the architecture and components of the Intel 8086 microprocessor. It describes the microprocessor as having a Bus Interface Unit (BIU) that fetches instructions and data from memory and I/O ports, and an Execution Unit (EU) that executes the instructions. The BIU uses four 16-bit segment registers - code, data, stack, and extra - to access different segments of memory and compute physical addresses. It multiplies the code segment register by 16 and adds the instruction pointer to generate addresses.
Microcontroller 8096
The document provides an overview of the Intel 8096 microcontroller. It discusses that the 8096 is a 16-bit microcontroller belonging to the MCS-96 family, capable of high-speed calculations. It then details the 8096's specifications, including its 16-bit CPU architecture, 6 addressing modes, 64KB address space, and 256-byte register file. The document also outlines the 8096's memory architecture, which separates instruction and data pathways, as well as its I/O ports, timers, serial port, and 100 instruction set. Finally, it briefly mentions other Intel microcontroller versions such as the 8048, 8051, 80186, and 80386 EX.
Vb 8086 programme
The document provides information about the Intel 8086 microprocessor. It describes the 8086's 16-bit architecture, its ability to access up to 1MB of memory using segmented addressing, and its internal architecture which includes an ALU, control unit, registers, and buses. It also provides examples of 8086 assembly language programs for tasks like Fibonacci series, addition, sorting, and converting between ASCII and BCD formats.
Chapter 5
The 8085 microprocessor has 40 pins that are grouped into address bus, data bus, control and status bus, power supply and frequency pins, externally initiated and acknowledgement signals, and serial I/O ports. It was introduced in 1976 and has an 8-bit processor architecture with a 16-bit address bus, allowing it to access up to 64KB of memory. Internally, the 8085 includes an ALU, registers, timing and control unit, instruction register and decoder, and interrupt control unit.
Introduction to 8086 Microprocessors.ppt
The 8086 microprocessor is a 16-bit processor released by Intel in 1978. It has approximately 29,000 transistors and a 40-pin DIP package. The 8086 uses 20-bit addresses, allowing it to access up to 1 megabyte of memory space. It is divided into two main units - the Bus Interface Unit which fetches instructions and data from memory, and the Execution Unit which decodes and executes the instructions. The 8086 has 4 segment registers (CS, DS, SS, ES), 7 general purpose 16-bit registers (AX, BX, CX, DX, SP, BP, SI, DI), an instruction pointer register, and a flag register.
8086slide
The 8086 microprocessor is Intel's first 16-bit microprocessor released in 1978. It has approximately 29,000 transistors, operates at 5V, and can address up to 1 megabyte of memory space using 20 address lines. The 8086 uses separate 16-bit addresses for I/O devices, allowing it to access 64k I/O addresses. It can operate in minimum or maximum mode depending on the state of the MN/MX pin. In maximum mode, additional pins are used for bus requests and status signals to support multi-processor systems. The 8086 architecture separates execution and bus interface functions, using segment registers and an instruction pointer to generate physical addresses across 1MB of memory divided into segments.
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2
- 1. Designing the 8086/8088 Microcomputer System
- 2. Typical Microprocessor Based System CPU Memory/IO Control Address Data
- 3. 8086/8088 Busses • Address Bus – 20 address lines so a 220 byte address space. – Pins A0-A19 provide the address – For 8086, A0-A15 are multiplexed with D0-D15 to form AD0-AD15 – For 8088, A0-A7 are multiplexed with D0-D7 to form AD0-AD7 • Data Bus – For 8086, 16 bit data bus D0-D15 (multiplexed as AD0-AD15) – For 8088, 8 bit data bus D0-D7 (multiplexed as AD0-AD7) • Control Bus – For memory access, the following pins are used: RD’, WR’, M/IO’, DT/R’, DEN’, ALE, BHE’ – Other input signals to control 8086 performance: clk ,reset , ready , hold , test’, intr , nmi ,mn’/mx - The intr and hold are acknowledged through intra and holda respectively.
- 6. 8284A
- 9. Ready logic (adding wait states)
- 13. 8086/8088 Detailed Memory Interface 8086/8 Control Multiplexed Addr/Data Latches Buffers Demultiplexing Control Address Data Address Decoding Unique per device M E M O R Y Partial Address CS’,WE’,OE’
- 16. 8086 maximum & minimum modes • The mode is controlled by MN/MX. • Maximum mode is obtained by connecting MN/MX to high and minimum mode is by connecting it to high. • Having two different modes (minimum and maximum) is used only 8088/8086. • Each mode enables a different control structure. • Minimum mode operation and control signals are very similar to those of 8085. • So 8085 8-bit peripherals can be used with 8086 without special considerations. • Easy and least expensive way to build single processor systems
- 17. 8086/8088 Pin Configuration Differences
- 18. Maximum mode • Maximum mode is designed to be used with a coprocessor exists in the system. • All the control signals (except RD ) are not generated by the microprocessor. • But we still need those control signals. • Solution: • 8288.
- 20. S2 S1 S0 operation signal 0 0 0 Interrupt Acknowledge INTA 0 0 1 Read I/O port IORC 0 1 0 Write I/O port IOWC, AIOWC 0 1 1 Halt none 1 0 0 Instruction Fetch MRDC 1 0 1 Read Memory MRDC 1 1 0 Write Memory MWTC, AMWC 1 1 1 Passive none
- 21. QS1 QS0 0 0 No instruction taken from queue. 0 1 First byte of current instruction taken from queue. 1 0 Queue flushed. 1 1 Byte other than first byte taken from queue.