The document summarizes features of the 8086 microprocessor. It is a 16-bit microprocessor that can access up to 1MB of memory using a 20-bit address bus. It has multiplexed address and data lines and 14 registers. The 8086 has an execution unit that performs arithmetic and logical operations and a bus interface unit that handles memory access. It supports memory segmentation and different addressing modes. Interrupts are also supported through an interrupt acknowledge cycle.
The 8086 CPU is a 16-bit microprocessor with a 16-bit data bus, 20-bit address bus, and includes an ALU, BIU, and EU. The BIU fetches instructions and data from memory using segment registers and address pointers, while the EU decodes and executes instructions using general purpose registers like AX, BX, CX, DX, and flags. Memory is divided into segments of up to 64KB that can overlap. The 8086 supports various addressing modes to access memory locations.
This document provides an overview of the Intel 8086 microprocessor. It discusses the software architecture, including memory segmentation, registers, stack, and I/O space. The hardware architecture is also covered, such as the pin details, minimum/maximum mode, and address generation. Programming the 8086 using assembly language is mentioned as well.
This document contains an assignment for a course on Microprocessors and Assembly Language. It includes 11 multiple choice and short answer questions about microprocessor fundamentals like the 8086 architecture, instruction fetching process, and developing assembly language programs. It covers topics such as the differences between 8-bit, 16-bit, and 32-bit microprocessors, the functions of execution units, memory addressing, and the major steps for writing assembly language programs.
The 8085 microprocessor has 40 pins that operate at 5V. The pins can be grouped into power/frequency pins, serial I/O pins, address bus pins, data bus pins, control/status pins, and externally initiated pins. The address bus pins carry memory/I/O addresses, while the data bus pins carry data and lower addresses in a time-multiplexed fashion. Control signals include ALE, RD, WR, IO/M and status signals S1-S0. Interrupt pins include TRAP, RST 7.5-5.5, INTR. HOLD and HLDA pins support DMA operations while RESET and READY pins control resetting and peripheral handshaking.
The document discusses specifications and pinouts of the 8086 and 8088 microprocessors. It describes that both are 16-bit processors packaged in 40-pin DIP packages, with the 8086 having a 16-bit data bus and the 8088 having an 8-bit data bus. It also discusses the 8284A clock generator chip used with these processors, providing clock signals, reset synchronization and ready synchronization. The document outlines the bus timing of the processors over four clock cycles and how the ready pin inserts wait states for slower memory and I/O components.
This document describes the pin functions of the Intel 8086 microprocessor. It explains that 32 pins have the same functions in minimum and maximum mode, while 8 pins have different functions depending on the mode. It provides details on the pin symbols, numbers, types, and functions for address bus lines, status lines, control lines for reading, writing, interrupts, and more. The pins with differing functions in minimum and maximum modes are also described.
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.
The document provides an overview of the Intel 8086 microprocessor architecture. It discusses the two main functional units of 8086 - the Bus Interface Unit (BIU) and Execution Unit (EU). The BIU handles fetching instructions and data from memory and queuing instructions for the EU. It contains the instruction stream byte queue and segment registers. The EU contains the ALU, general purpose registers, flags register, and handles instruction decoding and execution. The general purpose registers include the accumulator, base, count, and data registers which can be used for temporary data storage and addressing modes.
The 8086 CPU is a 16-bit microprocessor with a 16-bit data bus, 20-bit address bus, and includes an ALU, BIU, and EU. The BIU fetches instructions and data from memory using segment registers and address pointers, while the EU decodes and executes instructions using general purpose registers like AX, BX, CX, DX, and flags. Memory is divided into segments of up to 64KB that can overlap. The 8086 supports various addressing modes to access memory locations.
This document provides an overview of the Intel 8086 microprocessor. It discusses the software architecture, including memory segmentation, registers, stack, and I/O space. The hardware architecture is also covered, such as the pin details, minimum/maximum mode, and address generation. Programming the 8086 using assembly language is mentioned as well.
This document contains an assignment for a course on Microprocessors and Assembly Language. It includes 11 multiple choice and short answer questions about microprocessor fundamentals like the 8086 architecture, instruction fetching process, and developing assembly language programs. It covers topics such as the differences between 8-bit, 16-bit, and 32-bit microprocessors, the functions of execution units, memory addressing, and the major steps for writing assembly language programs.
The 8085 microprocessor has 40 pins that operate at 5V. The pins can be grouped into power/frequency pins, serial I/O pins, address bus pins, data bus pins, control/status pins, and externally initiated pins. The address bus pins carry memory/I/O addresses, while the data bus pins carry data and lower addresses in a time-multiplexed fashion. Control signals include ALE, RD, WR, IO/M and status signals S1-S0. Interrupt pins include TRAP, RST 7.5-5.5, INTR. HOLD and HLDA pins support DMA operations while RESET and READY pins control resetting and peripheral handshaking.
The document discusses specifications and pinouts of the 8086 and 8088 microprocessors. It describes that both are 16-bit processors packaged in 40-pin DIP packages, with the 8086 having a 16-bit data bus and the 8088 having an 8-bit data bus. It also discusses the 8284A clock generator chip used with these processors, providing clock signals, reset synchronization and ready synchronization. The document outlines the bus timing of the processors over four clock cycles and how the ready pin inserts wait states for slower memory and I/O components.
This document describes the pin functions of the Intel 8086 microprocessor. It explains that 32 pins have the same functions in minimum and maximum mode, while 8 pins have different functions depending on the mode. It provides details on the pin symbols, numbers, types, and functions for address bus lines, status lines, control lines for reading, writing, interrupts, and more. The pins with differing functions in minimum and maximum modes are also described.
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.
The document provides an overview of the Intel 8086 microprocessor architecture. It discusses the two main functional units of 8086 - the Bus Interface Unit (BIU) and Execution Unit (EU). The BIU handles fetching instructions and data from memory and queuing instructions for the EU. It contains the instruction stream byte queue and segment registers. The EU contains the ALU, general purpose registers, flags register, and handles instruction decoding and execution. The general purpose registers include the accumulator, base, count, and data registers which can be used for temporary data storage and addressing modes.
The document discusses the features and architecture of the Intel 8086 microprocessor, including its 16-bit architecture, 20-bit address bus, instruction queue, segmentation of memory into four 64KB segments, registers, flag register, arithmetic logic unit, and various addressing modes. It also provides a comparison of the 8086 to the 8085 microprocessor and describes some applications of the 8086.
The document discusses the minimum and maximum mode systems of the 8086 microprocessor. In minimum mode, the 8086 generates all control signals and a single processor is used. In maximum mode, an external bus controller chip generates control signals and multiple processors can be used. It describes the components, address latching, read and write cycles, and I/O interfacing for both minimum and maximum mode 8086 systems.
Register Organization of 8086, Architecture, Signal Description of 8086, Physical Memory
Organization, General Bus Operation, I/O Addressing Capability, Special Processor Activities,
Minimum Mode 8086 System and Timings, Maximum Mode 8086 System and Timings.
Addressing Modes of 8086.
The document compares the Intel 8085 and 8086 microprocessors. The 8086 is a faster, more powerful 16-bit processor compared to the 8-bit 8085. Key differences include the 8086 having a larger address bus and data bus, more transistors allowing for faster processing, additional registers and instructions, and features like memory segmentation and parallel processing that improved performance. The 8086 also used a pipeline architecture to more efficiently fetch and execute instructions.
Detailed Explanation of Pin Description of 8085 microprocessorRamesh Dabhole
The document describes the pin diagram and functions of the 40 pins in the 8085 microprocessor. It discusses 14 groups of pins: 1) clock input pins, 2) reset output pin, 3) serial I/O pins, 4) interrupt pins, 5) address/data pins, 6) power/ground pins, 7) address output pins, 8) status/control pins, 9) interrupt pin, 10) interrupt acknowledgement pin, 11) address/data pins, 12) ground pin, 13) higher-order address pins, and 14) power input pin. Each group of pins has a specific role in executing instructions and transferring data in the 8085 microprocessor.
The 8086 CPU has two functional units - the Bus Interface Unit (BIU) and Execution Unit (EU). The BIU fetches instructions and data from memory and writes data to memory or ports. It uses an instruction queue to pre-fetch up to 6 bytes to improve execution speed. The EU decodes instructions and performs operations using its 16-bit ALU. The 8086 has general purpose registers including AX, BX, CX and DX and segment registers for addressing memory. It uses flags to indicate the result of operations.
The document discusses various concepts related to microprocessors including:
1. It defines a microprocessor as a program controlled semiconductor device that fetches, decodes and executes instructions. The basic units of a microprocessor are an ALU, registers and a control unit.
2. A bus is defined as a group of conducting lines that carries data, address and control signals. The data bus is bi-directional to allow the microprocessor to read from and write to memory or I/O devices.
3. A machine cycle is the time required to complete one memory, I/O or acknowledge operation and may consist of 3-6 T-states. A T-state is one clock period subdivision of
This document discusses memory and I/O interfacing using microprocessors. It describes how memory and I/O devices are interfaced by connecting data and address lines, as well as control signals. It also discusses the three main types of data transfer between microprocessors and I/O devices: programmed I/O, interrupt-driven I/O, and direct memory access. Additionally, it provides information on common I/O interface chips like the 8255 Programmable Peripheral Interface and the 8279 Keyboard/Display Controller.
The document provides information about the 8085 microprocessor. Some key points:
- The 8085 is an 8-bit processor with 40 pins that uses a multiplexed address/data bus. It operates at clock speeds from 500kHz to 3MHz.
- It has 16 address lines allowing access to 64KB of memory. It provides 5 hardware interrupts and contains registers like the accumulator, flag register, and 6 general purpose registers.
- Important pins include the AD bus, address lines A8-A15, control signals like ALE, RD, WR and status signals like READY. It also has pins for serial I/O and interrupts.
- The architecture includes the arithmetic logic unit,
The 8086 microprocessor is Intel's first 16-bit microprocessor released in 1978. It has 20 address lines allowing it to access up to 1 megabyte of memory. It uses segmented memory architecture where the 1 megabyte address space is divided into segments of 64KB each. The 8086 has four 16-bit segment registers - code segment, data segment, stack segment, and extra segment. It operates on minimum and maximum modes determined by the MN/MX pin. In maximum mode, additional pins are used for bus requests and grants.
The document summarizes the key components and features of the 8086 microprocessor including:
- It has a 16-bit arithmetic logic unit and data/address buses.
- It operates at clock frequencies between 5-10 MHz and has 14-16 bit registers.
- It has 40 pins and can operate in minimum or maximum mode.
- Key pins include AD0-AD15 for addressing, ALE for address latching, RD/WR for read/write operations.
Machine Language Instruction Formats – Instruction Set of 8086-Data transfer
instructions,Arithmetic and Logic instructions,Branch instructions,Loop instructions,Processor
Control instructions,Flag Manipulation instructions,Shift and Rotate instructions,String
instructions, Assembler Directives and operators,Example Programs,Introduction to Stack,
STACK Structure of 8086, Interrupts and Interrupt Service Routines, Interrupt Cycle of 8086,
Non-Maskable and Maskable Interrupts, Interrupt Programming, MACROS.
The document discusses different methods of input/output (I/O) operations in microprocessors, including programmed I/O, interrupt I/O, and direct memory access (DMA). Programmed I/O involves the microprocessor executing instructions to transfer data via I/O ports. Interrupt I/O allows external devices to trigger an interrupt service routine. DMA allows data transfers directly between memory and external devices without microprocessor involvement using a DMA controller.
PIN Specification of 8086 MicroprocessorNikhil Kumar
This document provides a pin diagram and configuration for an NRI Institute of Research Science and Technology chip. It describes the functions of pins including the address/data bus, status bits, interrupt request lines, clock input, memory/IO selection, and direct memory access control lines like HOLD and HLDA. The pin configuration section defines over 20 input and output pins for memory addressing, interrupt handling, bus control and chip interfacing.
The document discusses the architecture, programming, and interfacing of microprocessors using the 8086 as an example. It describes two models used to study microprocessors: the programmer's model which shows internal registers and buses, and the hardware model which shows pin diagrams. It then discusses the basic components of a microcomputer system using an 8086, including memory, I/O devices, and different types of buses. Finally, it provides details on the 8086 architecture, registers, addressing modes, and timing sequences for read and write cycles.
Minimum mode and Maximum mode Configuration in 8086Jismy .K.Jose
The document discusses the minimum and maximum mode configurations of the 8086 microprocessor. In minimum mode, a single 8086 processor controls all signals and there is one microprocessor. In maximum mode, more than one microprocessor is present and status signals determine control signals from a bus controller chip. The document also provides details on the pins, signals, and timing diagrams used in read, write, and bus request cycles for both minimum and maximum mode configurations.
8085 microprocessor Architecture and pin description Vijay Kumar
The document provides information about the Intel 8085 microprocessor, which was an 8-bit microprocessor introduced in 1976. It has 16 address lines and 8 data lines, allowing it to access 64KB of memory. It provides registers like the accumulator, flag register, and general purpose registers. It operates at a clock frequency of 3MHz and requires a +5V power supply. The 8085 has features like interrupts, serial I/O lines, and the ability to interface with external devices. It was available in a 40-pin DIP package.
The FLAGS register is a status register in Intel x86 microprocessors that contains the current state of the processor. It contains status flags like the carry flag, parity flag, zero flag, and sign flag that indicate the outcome of arithmetic operations. It also contains control flags like the interrupt flag and direction flag that control interrupt handling and string processing direction. The FLAGS register is 16-bits wide in 8086 processors and has been expanded to 32-bits and 64-bits in subsequent processors while maintaining backwards compatibility.
This document discusses the 8086 system bus structure. It begins by describing the basic configurations of minimum and maximum mode 8086 systems, including the system bus timing diagrams for read and write operations. It then discusses multiprocessor configurations using the 8086, including coprocessor configurations with the 8087 and closely/loosely coupled multiprocessor configurations. The document provides detailed information on the 8086 pin descriptions and signals in both minimum and maximum mode.
The document discusses the features and architecture of the Intel 8086 microprocessor, including its 16-bit architecture, 20-bit address bus, instruction queue, segmentation of memory into four 64KB segments, registers, flag register, arithmetic logic unit, and various addressing modes. It also provides a comparison of the 8086 to the 8085 microprocessor and describes some applications of the 8086.
The document discusses the minimum and maximum mode systems of the 8086 microprocessor. In minimum mode, the 8086 generates all control signals and a single processor is used. In maximum mode, an external bus controller chip generates control signals and multiple processors can be used. It describes the components, address latching, read and write cycles, and I/O interfacing for both minimum and maximum mode 8086 systems.
Register Organization of 8086, Architecture, Signal Description of 8086, Physical Memory
Organization, General Bus Operation, I/O Addressing Capability, Special Processor Activities,
Minimum Mode 8086 System and Timings, Maximum Mode 8086 System and Timings.
Addressing Modes of 8086.
The document compares the Intel 8085 and 8086 microprocessors. The 8086 is a faster, more powerful 16-bit processor compared to the 8-bit 8085. Key differences include the 8086 having a larger address bus and data bus, more transistors allowing for faster processing, additional registers and instructions, and features like memory segmentation and parallel processing that improved performance. The 8086 also used a pipeline architecture to more efficiently fetch and execute instructions.
Detailed Explanation of Pin Description of 8085 microprocessorRamesh Dabhole
The document describes the pin diagram and functions of the 40 pins in the 8085 microprocessor. It discusses 14 groups of pins: 1) clock input pins, 2) reset output pin, 3) serial I/O pins, 4) interrupt pins, 5) address/data pins, 6) power/ground pins, 7) address output pins, 8) status/control pins, 9) interrupt pin, 10) interrupt acknowledgement pin, 11) address/data pins, 12) ground pin, 13) higher-order address pins, and 14) power input pin. Each group of pins has a specific role in executing instructions and transferring data in the 8085 microprocessor.
The 8086 CPU has two functional units - the Bus Interface Unit (BIU) and Execution Unit (EU). The BIU fetches instructions and data from memory and writes data to memory or ports. It uses an instruction queue to pre-fetch up to 6 bytes to improve execution speed. The EU decodes instructions and performs operations using its 16-bit ALU. The 8086 has general purpose registers including AX, BX, CX and DX and segment registers for addressing memory. It uses flags to indicate the result of operations.
The document discusses various concepts related to microprocessors including:
1. It defines a microprocessor as a program controlled semiconductor device that fetches, decodes and executes instructions. The basic units of a microprocessor are an ALU, registers and a control unit.
2. A bus is defined as a group of conducting lines that carries data, address and control signals. The data bus is bi-directional to allow the microprocessor to read from and write to memory or I/O devices.
3. A machine cycle is the time required to complete one memory, I/O or acknowledge operation and may consist of 3-6 T-states. A T-state is one clock period subdivision of
This document discusses memory and I/O interfacing using microprocessors. It describes how memory and I/O devices are interfaced by connecting data and address lines, as well as control signals. It also discusses the three main types of data transfer between microprocessors and I/O devices: programmed I/O, interrupt-driven I/O, and direct memory access. Additionally, it provides information on common I/O interface chips like the 8255 Programmable Peripheral Interface and the 8279 Keyboard/Display Controller.
The document provides information about the 8085 microprocessor. Some key points:
- The 8085 is an 8-bit processor with 40 pins that uses a multiplexed address/data bus. It operates at clock speeds from 500kHz to 3MHz.
- It has 16 address lines allowing access to 64KB of memory. It provides 5 hardware interrupts and contains registers like the accumulator, flag register, and 6 general purpose registers.
- Important pins include the AD bus, address lines A8-A15, control signals like ALE, RD, WR and status signals like READY. It also has pins for serial I/O and interrupts.
- The architecture includes the arithmetic logic unit,
The 8086 microprocessor is Intel's first 16-bit microprocessor released in 1978. It has 20 address lines allowing it to access up to 1 megabyte of memory. It uses segmented memory architecture where the 1 megabyte address space is divided into segments of 64KB each. The 8086 has four 16-bit segment registers - code segment, data segment, stack segment, and extra segment. It operates on minimum and maximum modes determined by the MN/MX pin. In maximum mode, additional pins are used for bus requests and grants.
The document summarizes the key components and features of the 8086 microprocessor including:
- It has a 16-bit arithmetic logic unit and data/address buses.
- It operates at clock frequencies between 5-10 MHz and has 14-16 bit registers.
- It has 40 pins and can operate in minimum or maximum mode.
- Key pins include AD0-AD15 for addressing, ALE for address latching, RD/WR for read/write operations.
Machine Language Instruction Formats – Instruction Set of 8086-Data transfer
instructions,Arithmetic and Logic instructions,Branch instructions,Loop instructions,Processor
Control instructions,Flag Manipulation instructions,Shift and Rotate instructions,String
instructions, Assembler Directives and operators,Example Programs,Introduction to Stack,
STACK Structure of 8086, Interrupts and Interrupt Service Routines, Interrupt Cycle of 8086,
Non-Maskable and Maskable Interrupts, Interrupt Programming, MACROS.
The document discusses different methods of input/output (I/O) operations in microprocessors, including programmed I/O, interrupt I/O, and direct memory access (DMA). Programmed I/O involves the microprocessor executing instructions to transfer data via I/O ports. Interrupt I/O allows external devices to trigger an interrupt service routine. DMA allows data transfers directly between memory and external devices without microprocessor involvement using a DMA controller.
PIN Specification of 8086 MicroprocessorNikhil Kumar
This document provides a pin diagram and configuration for an NRI Institute of Research Science and Technology chip. It describes the functions of pins including the address/data bus, status bits, interrupt request lines, clock input, memory/IO selection, and direct memory access control lines like HOLD and HLDA. The pin configuration section defines over 20 input and output pins for memory addressing, interrupt handling, bus control and chip interfacing.
The document discusses the architecture, programming, and interfacing of microprocessors using the 8086 as an example. It describes two models used to study microprocessors: the programmer's model which shows internal registers and buses, and the hardware model which shows pin diagrams. It then discusses the basic components of a microcomputer system using an 8086, including memory, I/O devices, and different types of buses. Finally, it provides details on the 8086 architecture, registers, addressing modes, and timing sequences for read and write cycles.
Minimum mode and Maximum mode Configuration in 8086Jismy .K.Jose
The document discusses the minimum and maximum mode configurations of the 8086 microprocessor. In minimum mode, a single 8086 processor controls all signals and there is one microprocessor. In maximum mode, more than one microprocessor is present and status signals determine control signals from a bus controller chip. The document also provides details on the pins, signals, and timing diagrams used in read, write, and bus request cycles for both minimum and maximum mode configurations.
8085 microprocessor Architecture and pin description Vijay Kumar
The document provides information about the Intel 8085 microprocessor, which was an 8-bit microprocessor introduced in 1976. It has 16 address lines and 8 data lines, allowing it to access 64KB of memory. It provides registers like the accumulator, flag register, and general purpose registers. It operates at a clock frequency of 3MHz and requires a +5V power supply. The 8085 has features like interrupts, serial I/O lines, and the ability to interface with external devices. It was available in a 40-pin DIP package.
The FLAGS register is a status register in Intel x86 microprocessors that contains the current state of the processor. It contains status flags like the carry flag, parity flag, zero flag, and sign flag that indicate the outcome of arithmetic operations. It also contains control flags like the interrupt flag and direction flag that control interrupt handling and string processing direction. The FLAGS register is 16-bits wide in 8086 processors and has been expanded to 32-bits and 64-bits in subsequent processors while maintaining backwards compatibility.
This document discusses the 8086 system bus structure. It begins by describing the basic configurations of minimum and maximum mode 8086 systems, including the system bus timing diagrams for read and write operations. It then discusses multiprocessor configurations using the 8086, including coprocessor configurations with the 8087 and closely/loosely coupled multiprocessor configurations. The document provides detailed information on the 8086 pin descriptions and signals in both minimum and maximum mode.
The 8086 microprocessor is an enhanced 16-bit version of the 8085 microprocessor. It has 16 data lines, 20 address lines, and supports up to 1MB of storage. It features an instruction queue, 16-bit registers, and two-stage pipelining for faster processing. The 8086 uses a segmented memory architecture and has separate execution and bus interface units connected by an internal bus. It was the first widely used 16-bit microprocessor.
Chapter 2_1(8086 System configuration).pptxmelaku76
The document describes the pin layout and system configuration of the Intel 8086 microprocessor. It discusses the pin details and functions in both minimum and maximum mode. In minimum mode, the 8086 generates all control signals itself and operates as a single processor system. In maximum mode, an 8288 bus controller chip is used to derive control signals from status lines, allowing for multiple processors. Memory, I/O devices, latches and transceivers are used to separate address and data signals. Read and write cycles are explained along with the timing of control signals like ALE, RD and WR.
digital communication,micro processor,pulse and digital circuitsManasa Mona
The document provides information about the Intel 8086 microprocessor. It discusses that the 8086 is a 16-bit microprocessor introduced in 1978. It has a 16-bit data bus and 20-bit address bus, allowing it to access 1 megabyte of memory. The architecture of the 8086 is divided into a Bus Interface Unit and an Execution Unit to improve parallel processing. It also describes the various registers of the 8086 like the general purpose registers, segment registers, instruction pointer, and flag register. Finally, it briefly discusses interrupts in the 8086, dividing them into external hardware interrupts, internal software interrupts, and the two hardware interrupt pins - non-maskable and maskable interrupts.
The 8086 microprocessor is a 16-bit CPU that can access up to 1 MB of memory. It has multiplexed address/data buses and requires a +5V power supply. It has two main units: the Bus Interface Unit (BIU) handles memory access and the Execution Unit (EU) executes instructions. These units operate asynchronously using pipelining for improved performance. The BIU fetches instructions into a 6-byte queue and the EU reads them from the queue. The 8086 uses segmented memory addressing with code, data, extra, and stack segments of 64KB each.
The document describes the architecture of the 8085 microprocessor. It includes 8-bit registers like the accumulator and register sets that store data and perform arithmetic/logical operations. It has a 16-bit program counter that points to the next instruction and a stack pointer that manages subroutine calls. There is a flag register that stores status flags updated by operations. Other components are an ALU, instruction decoder, address/data buffers, and interrupt and I/O controls.
The document discusses the architecture and features of the 8086 microprocessor. It is a 16-bit microprocessor designed by Intel in 1978 as an enhanced version of the 8085. It has a 16-bit data bus and 20-bit address bus allowing access to 1MB of memory. It uses a pipeline architecture with a bus interface unit handling data transfers and an execution unit that decodes and executes instructions. The 8086 has several general purpose and special purpose registers including segment and index registers. It also has a flag register to indicate arithmetic results and machine status.
The document describes the architecture and operation of the 8086 microprocessor. It discusses the key components of the 8086 including the execution unit, bus interface unit, address/data buses, control signals, and pin functions. It provides details on bus cycles, instruction cycles, and how the multiplexed address/data buses need to be demultiplexed for proper memory and I/O interfacing.
The document discusses microprocessors, microcontrollers, and the 8085 microprocessor. It defines a microprocessor as a programmable device that performs arithmetic and logical operations on numbers according to a stored program. A microcontroller is similar but has memory and I/O functions integrated on a single chip. The 8085 is an 8-bit microprocessor with 40 pins that can address 64KB of memory and has 74 instructions across 5 addressing modes. It uses multiplexed address and data lines to reduce pins.
The document provides information about the 8085 microprocessor, including its architecture, features, instruction formats, and addressing modes. The 8085 is an 8-bit microprocessor with an accumulator, registers, arithmetic logic unit (ALU), flags, and I/O controls. It has three types of instructions that are 1, 2, or 3 bytes long. The addressing modes allow instructions to specify operands and include immediate, direct, register, register indirect, and implicit modes.
The 8086 microprocessor is a 16-bit CPU with a 20-bit address bus that can access up to 1MB of memory. It has two main units: the Bus Interface Unit (BIU) which handles memory access and addressing, and the Execution Unit (EU) which decodes and executes instructions. The BIU uses a 6-byte instruction queue to overlap instruction fetching and execution, improving performance. The 8086 supports segmented memory allowing code, data, stack and extra segments each up to 64KB in size.
The 8086 CPU is a 16-bit microprocessor that uses multiplexed address/data buses. It has a 20-line address bus that can access up to 1MB of memory. The address bus uses multiplexing to combine lower order address lines with data lines and higher order lines with status signals. The 8086 also uses pipelining to overlap the fetch, decode, execute, and write stages of instruction processing and improve throughput. Pipeline hazards can occur and limit performance.
The 8086 microprocessor is a 16-bit CPU with a 20-bit address bus that can access up to 1 MB of memory. It has two main components: the Bus Interface Unit (BIU) and Execution Unit (EU). The BIU handles fetching instructions and reading/writing memory/I/O, while the EU decodes and executes instructions. The 8086 uses segmented memory addressing across four 16-bit segment registers - code, data, stack, and extra. It has 16-bit registers including general purpose, index, pointer and flag registers. The flags register indicates results like carry, zero from arithmetic instructions.
The document discusses the 8086 microprocessor. It has a 16-bit data bus (8086) or 8-bit data bus (8088). The 8086 has a 40-pin design while the 8088 has a pin that is either SSO or a regular pin. The document describes the pinouts, bus cycles, memory organization, and differences between minimum and maximum mode systems for both chips.
This document describes the components and operation of the Intel 8085 microprocessor. It contains:
- Details of the buses (data, address, control), registers (program counter, stack pointer, flags), arithmetic logic unit, and timing/control circuitry.
- Explanations of the address bus width, data bus width, and bus multiplexing used to alternate between address and data on the lower order address lines.
- Pin configurations and signals for clock input/output, address/data buses, and control signals like HOLD and HLDA used for direct memory access.
- Timing diagrams showing the fetch-execute sequence where the program counter addresses memory to fetch instructions.
Pin Diagram and block diagram 8085 .pptxYashArya40
This block diagram summarizes the main components of the 8085 microprocessor:
- The Arithmetic Logic Unit (ALU) performs arithmetic and logical operations.
- The accumulator is connected to the ALU and data bus and stores results of operations.
- The flag register stores status flags like zero and carry after operations to check results.
- There are six general purpose registers that can hold 8-bit values and work in pairs as 16-bit registers.
- The program counter holds the address of the next instruction to execute.
- The stack pointer manages stack operations like PUSH and POP.
- Other components include the instruction register, address and data buses, pins for inputs
A SYSTEMATIC RISK ASSESSMENT APPROACH FOR SECURING THE SMART IRRIGATION SYSTEMSIJNSA Journal
The smart irrigation system represents an innovative approach to optimize water usage in agricultural and landscaping practices. The integration of cutting-edge technologies, including sensors, actuators, and data analysis, empowers this system to provide accurate monitoring and control of irrigation processes by leveraging real-time environmental conditions. The main objective of a smart irrigation system is to optimize water efficiency, minimize expenses, and foster the adoption of sustainable water management methods. This paper conducts a systematic risk assessment by exploring the key components/assets and their functionalities in the smart irrigation system. The crucial role of sensors in gathering data on soil moisture, weather patterns, and plant well-being is emphasized in this system. These sensors enable intelligent decision-making in irrigation scheduling and water distribution, leading to enhanced water efficiency and sustainable water management practices. Actuators enable automated control of irrigation devices, ensuring precise and targeted water delivery to plants. Additionally, the paper addresses the potential threat and vulnerabilities associated with smart irrigation systems. It discusses limitations of the system, such as power constraints and computational capabilities, and calculates the potential security risks. The paper suggests possible risk treatment methods for effective secure system operation. In conclusion, the paper emphasizes the significant benefits of implementing smart irrigation systems, including improved water conservation, increased crop yield, and reduced environmental impact. Additionally, based on the security analysis conducted, the paper recommends the implementation of countermeasures and security approaches to address vulnerabilities and ensure the integrity and reliability of the system. By incorporating these measures, smart irrigation technology can revolutionize water management practices in agriculture, promoting sustainability, resource efficiency, and safeguarding against potential security threats.
ACEP Magazine edition 4th launched on 05.06.2024Rahul
This document provides information about the third edition of the magazine "Sthapatya" published by the Association of Civil Engineers (Practicing) Aurangabad. It includes messages from current and past presidents of ACEP, memories and photos from past ACEP events, information on life time achievement awards given by ACEP, and a technical article on concrete maintenance, repairs and strengthening. The document highlights activities of ACEP and provides a technical educational article for members.
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2. 8086 FEATURES
It is a 16 bit μp.
It is manufactured with H-MOS technology.
8086 has a 20 bit address bus can access up to 220 memory
locations ( 1 MB) .
It has multiplexed address and data bus AD0- AD15 and A16 –
A19.
It provides fourteen 16-bit registers.
8086 is designed to operate in two modes, Minimum(single
processor) and Maximum(multi processor).
It can pre fetches up to 6 instruction bytes from memory and
queues them in order to speed up instruction execution.
It can support upto 64K I/O ports.
It requires a +5V power supply
It is enclosed with 40 pins DIP (dual in line package).
3.
4. 8086 has two blocks BIU and EU
BIU contains Instruction queue, Segment
registers,Instruction pointer, Address adder.
EU contains Control circuitry, Instruction decoder,
ALU,Pointer and Index register, Flag register.
The BIU performs all bus operations such as instruction
fetching, reading and writing operands for memory and
calculating the addresses of the memory operands.
EU executes instructions from the instruction system byte
queue.
5. INSTRUCTION QUEUE
To increase the execution speed, BIU fetches as many
as six instruction bytes ahead of time from memory.
All six bytes are arranged in first in first out structure in a
6 byte register called instruction queue.
The instructions from the queue are taken sequentially
for decoding.
This pre fetching operation of BIU may be in parallel
with execution operation of EU, which improves the
speed execution of the instruction.
While opcode is fetched by BIU, the EU executes
previously decoded instruction concurrently. Thus BIU
along with EU forms a pipeline.
6. PHYSICAL ADDRESS FORMATION
Segment address: 1005 H
Offset address : 5555 H
Segment address: 1005 H: 0001 0000 0000 0101
Shifted left by 4 bit po’s :0001 0000 0000 0101 0000
+
Offset address : 0101 0101 0101 0101
Physical address :0001 0101 0101 1010 0101
1 5 5 A 5 H
Physical address= 10H* Segment address+ Offset
address
7. EXECUTION UNIT (EU)
It has 16 bit ALU, able to perform all arithmetic and
logical operations.
The 16-bit flag register reflects the results of execution
by ALU.
The decoding unit decodes the opcode bytes.
The timing and control unit derives the necessary
control signals to execute the instruction.
9. GENERAL PURPOSE REGISTERS
AX: used as 16-bit accumulator, with the lower 8-
bits of AX designated as AL and higher 8-bits as
AH.
BX: used as offset storage for forming physical
addresses in case of certain addressing modes.
CX: used as a default counter in case of string and
loop instructions.
DX: used as an implicit operand or destination in
case of a few instructions.
used to hold data for MUL & DIV operations
10. SEGMENT REGISTERS
Code Segment (CS): The CS register is used for
addressing a memory location in the Code Segment of
the memory, where the executable program is stored.
Data Segment (DS): The DS register is used for
addressing the Data Segment of the memory, where
the data is stored.
Stack Segment (SS): The SS register is used for
addressing the Stack Segment of the memory, i.e. the
memory which is used to store stack data.
Extra Segment (ES): ES is additional data segment.
The ES register is used for addressing the Extra
Segment of the memory, where the data is stored.
11. POINTERS AND INDEX REGISTERS
The pointers stores offset addresses within the particular
segments
IP code segment
BP data segment
SP stack segment
o Source Index (SI): It is used for storing offset address of
source data in data segment. It is also used for indexed,
based indexed and register indirect addressing modes.
Destination Index (DI): It is used for storing offset address of
destination data in data or extra segment. It is also used for
indexed, based indexed and register indirect addressing
modes.
14. STATUS/CONDITIONAL CODE FLAGS
SF :sign flag is set when the result of
operation is negative.
ZF: zero flag is set when the result of
operation is zero.
AF: auxiliary carry flag is set when there is a
carry from lower nibble or lower four bits of
the operation.
PF: parity flag is set if the result has even
no.of ones in the lower byte.
CF: carry flag is set when there is a carry
from the result.
OF:over flow flag is set when the result of
signed operation overflows into the sign bit.
15. CONTROL FLAGS
TF: When trap flag is set, the processor enters
into single step execution mode . i.e. It executes
the program instruction by instruction.
IF: It is an interrupt enable/disable flag. If it is
set, the maskable interrupts are recognized by
the processor otherwise they are ignored.
DF:It is used in string operation.
If it is set, string bytes are accessed from
higher memory address to lower memory
address. i.e. auto decrementing mode.
When it is reset, the string bytes are accessed
from lower memory address to higher memory
address. i.e. auto incrementing mode.
16. MEMORY SEGMENTATION
The size of address bus of8086 is 20 and is able to
address 1 Mbytes (220 ) of physical memory.
The compete 1 Mbytes memory can be divided into 16
segments, each of 64 Kbytes size and is addressed by
one of the segment registers.
The addresses of the segment may be assigned as
0000H to F000H respectively.
An offset address is used to address a specific memory
location within the segment.
The offset address values are from 0000H to FFFF H so
that the physical addresses range from 00000H to
FFFFF H.
19. ADVANTAGES
Allows the memory capacity to be 1MB although the
actual addresses to be handled are of 16 bit size.
Allows the placing of code, data and stack portions of
the same program in different parts of memory for
protection.
21. AD15-AD0 : These are the time multiplexed memory I/O
address and data lines. Address remains on the lines
during T1 state, while the data is available on the data bus
during T2, T3, Tw and T4.
When the memory or I/O device is not able to respond
quickly during transfer, wait states (Tw) are inserted
between T3 and T4 by disabling the READY input of the
8086. The bus activity during wait state is same as during
T3.
A19/S6,A18/S5,A17/S4,A16/S3 : These are the time
multiplexed address and status lines.
22. The S4 and S3 combinely indicate which segment register is
presently being used for memory accesses .
The status of interrupt enable flag bit is updated at the beginning of
each clock cycle and it is displayed on S5
The status line s6 is always low.
23. BHE/S7 : The bus high enable is used to indicate the
transfer of data over the higher order ( D15-D8 ) data bus
.
BHE is low during T1 for read, write and interrupt
acknowledge cycles, whenever a byte is to be transferred
on higher byte of data bus.
BHE and A0 indicates which byte of data is transferring.
24. RD – Read : This signal on low indicates the peripheral
that the processor is performing memory or I/O read
operation.
READY : This is the acknowledgement from the slow
device or memory that they have completed the data
transfer.
INTR-Interrupt Request : This is a level triggered input.
This is sampled during the last clock cycle of each
instruction to determine the availability of the request. If
any interrupt request is pending, the processor enters
the interrupt acknowledge cycle.
TEST : This input is examined by a ‘WAIT’ instruction. If
the TEST pin goes low, execution will continue, else the
processor remains in wait state.
25. CLK- Clock Input : The clock input provides the basic
timing for processor operation and bus control activity.
Its an square wave.
NMI: An edge triggered input, causes a type-2 interrupt.
NMI is not maskable internally by software. A transition
from a LOW to HIGH on this pin initiates the interrupt at
the end of the current instruction.
Reset: Reset causes the processor to terminate the
present activity and start execution from FFFF0H. This
signal is active high and must be active for at least four
clock cycles.
MN/MX = 1 for minimum mode
= 0 for maximum mode
26. When the Minimum mode operation is selected, the
8086
provides all control signals needed to implement the
memory and I/O interface.
M/IO = 1 for memory operation
= 0 for I/O operation
INTA: Interrupt Acknowledge. It goes low, when the
processor has accepted the interrupt. It is active LOW
during T2, T3, and T4 of each interrupt acknowledge
cycle.
DT/ R :DATA Transmit/Receive
DT/ R = 1 when the processor transmits data
= 0 when the processor receives data
27. ALE : Address Latch Enable
It indicates the availability of valid address over the
address/data lines. It is used to enable the latches to
separate the address from the multiplexed address/data
signal.
28. DEN :Data Enable
It indicates the availability of valid data over the
address/data lines. It is used to enable the transceivers
to separate the data from the multiplexed address/data
signal.
29. HOLD & HLDA: When the HOLD line goes high, it
indicates that another master is requesting the bus
access. After receiving the HOLD request, it issues HLDA
signal in the middle of next clock cycle .
If a DMA request is made while cpu executing a program,
it will release the bus during T4 provided
1.the request occur on or before T2 of current cycle
2.the current cycle is not operating over the lower byte of
a word.
3.a Lock instruction is not being executed.
30. When the 8086 is set for the maximum-mode operation, it
provides signals for implementing a multiprocessor /
coprocessor system environment.
S2, S1, S0 : these status lines indicate the type of
operation being carried out by the processor.
These pins are active during T4, T1 and T2 states and is
returned to passive state during T3 or Tw (when ready is
inactive).
31. QS0, QS1 : Queue – Status
these lines give information about the status of instruction
byte queue.
32. LOCK : it indicates that other system bus master will be
prevented from gaining the system bus.
RQ/GT0 and RQ/GT1 (I/O): Request/Grant
These pins are used by other processors in a multi
processor organization to force the processor to release the
Local bus at the end of current cycle.
33. PHYSICAL MEMORY ORGANIZATION
In 8086 the 1MB physical memory is organized as odd
and even banks, each of 512KB.
A byte data with even address is transferred on D0-D7,
while byte data with odd address is transferred on D8-
D15.
The processor provides BHE and A0 for the selection of
either odd or even or both the banks.
The memory map of 8086 system starts at 00000H to
FFFFFH.
34.
35. The locations from FFFF0H to FFFFFH are reserved for
operations including jump to initialization program and
I/O processor initialization .
The locations 00000H to 003FFH are reserved for
interrupt vector table.
36. INTERRUPTS
While CPU is executing a program, an interrupt break the normal
sequence of execution of instructions,diverts its execution to some
other program called Interrupt Service Routine(ISR).
After executing ISR ,the control is transferred back again to the
main program.
Whenever a no.of devices interrupt a CPU at a time and if the
processor is able to handle them properly,it is said to have multiple
interrupt processing capability.
8086 has two interrupt pins NMI and INTR.
NMI :Non Maskable Interrupt
Any interrupt at NMI cannot be masked or disabled.
INTR interrupt may be masked using Interrupt Flag. INTR is of 256
types.
The INTR types may be from 00 to FF H. If more than one type of
INTR interrupt occurs at a time,then an external chip called
Programmable Interrupt Controller is required to handle them.
37. TYPES OF INTERRUPTS
External interrupt: due to an external device or a
signal interrupts the processor.
ex: keyboard interrupt
Internal interrupt: generated internally by the
processor circuit or by execution of an interrupt
instruction.
Ex: divide by 0, overflow interrupts and interrupts
due to INT instructions.
38. INTERRUPT CYCLE OF 8086
When an external device interrupts the CPU at NMI or INTR
pin, while executing a program
The CPU first completes the execution of current instruction
and IP is incremented to point the next instruction.
The contents of IP and CS are pushed to stack.
The CPU then only acknowledges the requesting device
immediately on INTA if it is a NMI,TRAP or divide by 0.
If it is INTR request, the CPU checks the IF flag.
If IF flag is set then it acknowledges the device otherwise the
interrupt is ignored.
After acknowledgement the CPU computes the vector
address from the type of interrupt. Then the control is
transferred to ISR for serving the interrupt device.
The ISR address is available in Interrupt Vector Table.
At the end of ISR last instruction should be IRET.