Microprocessor and interfacing
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MICROPROCESSOR AND INTERFACING. AUTHORS :RAMESH.S.GAONKAR BADRI RAM DOUGLAS.V.HALL LIU AND GIBSON. Syllabus of Microprocessor. Introduction to microprocessor Architecture and block diagram of microprocessor 8085 microprocesso 8237 DMA Controller

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Microprocessor and interfacing

MICROPROCESSOR AND INTERFACING

AUTHORS :RAMESH.S.GAONKAR

BADRI RAM

DOUGLAS.V.HALL

LIU AND GIBSON


Syllabus of microprocessor

Syllabus of Microprocessor

  • Introduction to microprocessor

  • Architecture and block diagram of microprocessor

  • 8085 microprocesso

  • 8237 DMA Controller

  • 8255 Programmable peripheral interface device

  • 8254 programmable interval timer

  • 8259 programmable inttrupt controller

  • 8086 microprocessor


What is microprocessor

What is Microprocessor?

A siliconchip that contains a CPU. In the world of personal computers, the terms microprocessor and CPU are used interchangeably. At the heart of all personal computers and most workstations sits a microprocessor. Microprocessors also control the logic of almost all digitaldevices, from clock radios to fuel-injection systems for automobiles


Microprocessor def con

Microprocessor def.. Con..

  • Microprocessor is a programmable device

  • It can be instructed to perform given tasks with in its capability.

  • The programmer selects instruction from the list and determines the sequence of execution for a given task.

  • It takes input from the input device and process the input as it behaves like a CPU and gives the output.


Microprocessor def con1

Microprocessor def.. Con..

  • Microprocessor is a clock driven semiconductor device consisting of electronic logic circuits manufactured by using a LSI or VLSI technique.

  • Microprocessor can be divided into three segments

  • 1)ALU

  • 2)Register array

  • 3)Control unit


Block diagram of microprocessor

Block diagram of microprocessor

Microprocessor

As

CPU

OUTPUT

INPUT

MEMORY


Characterstics which differentiate microprocessors

Characterstics which differentiate microprocessors

  • Instruction set: The set of instructions that the microprocessor can execute.

  • bandwidth: The number of bits processed in a single instruction.

  • clock speed: Given in megahertz (MHz), the clock speed determines how many instructions per second the processor can execute.


Structure of microprocessor

Structure of microprocessor

  • Chip containing no. of elements for the processing purposes.


History of microprocessor

History of microprocessor

  • Intel's 4004 is considered the first microprocesor .

  • The 4004 was later followed in 1972 by the 8008, the world's first 8-bit microprocessor.


History of microprocessor1

History of microprocessor……

  • then is the 8080 microprocessor evolved in 1974.

  • Then comes 8085 that is the 8 bit microprocessor


Continued

Continued…

  • Often the processor is required to manage various different tasks that have to be scheduled somehow and must also deal with outside interrupt sources such as an alarm when something goes wrong.

  • Real-time systems are those in which timeliness is as important as the correctness of the outputs, although this does NOT mean that they have to be ?fast systems?.

    • A real-time system does not have to process data in microseconds to be considered real-time - it must simply have response times that are constrained and thus predictable.


Real life applications of microprocessor

Real life applications of microprocessor

  • Microprocessors are used to handle a set of tasks that control one or more external events or systems.

  • Microprocessors are typically used in either reactive or embedded systems.

    • Reactive systems are those that have an ongoing interaction with their environment - for example, a fire-control system that constantly reacts to buttons pressed by a pilot.

    • Embedded systems are those used to control specialized hardware in which the computer system is installed - for example, the microprocessor system used to control the fuel/air mixture in the carburetor of many automobiles.

      •  In embedded systems the software system is completely encapsulated by the hardware that it controls.


Some questions

Some questions

  • What is SSI,MSI and LSI?

  • What is difference between microprocessor, microcontroller and microcomputer?

  • What is a bit, byte, nibble and a word?

  • What is difference between compiler and interpreter?

  • What is instruction and mnemonic?


8085 programming model

8085 programming model

  • Program counter

  • Stack pointer

  • General purpose registers

  • Accumulator

  • Flag registers

  • Data and address buses


8085 instruction set

8085 instruction set

  • Data transfer operations

  • Arithmetic operations

  • Logical operations

  • Branch operations

  • Machine control operations


Data transfer operations

Data transfer operations

  • MOV Rd,Rs

  • MVI R,8 bit

  • HLT

  • IN 8 bit port address accept the data from the input port specified in the second byte and loads into the accumulator.

  • NOP

  • OUT 8 bit port address copies the contents of the accumulator to the output port specified in the second byte,2 byte instruction


Data transfer operations1

Data transfer operations

  • This group of instructions copies data from a location called a source to another a location called destination without modifying the contents of the source.

  • Data transfer can be between 1)registers

  • Specified data byte to a register or memory location

  • Between a memory location and a register


Addressing mode

Addressing mode

  • Immediate addressing mvi

  • Register addressing mov

  • Direct addressing in/out ports

  • Indirect addressing


Logical operations

Logical operations

  • ANA R

  • ANI 8 bit

  • ORA R

  • ORI 8 bit

  • XRA R

  • XRI 8 bit

  • CMA


Arthimetic operations

Arthimetic operations

  • ADD R

  • ADI 8 bit

  • SUB R

  • SUI 8 bit

  • INR R

  • DCR R


Branch operations

Branch operations

  • JMP 16 bit 2nd(low) and 3rd(high) byte specifies 16 bit

  • Memory address

  • JC

  • JNC

  • JZ

  • JNZ

  • JP

  • JM


Microprocessor architecture

Microprocessor architecture

  • The process of data manipulation and communication is determined by the logic design of the microprocessor called the arcitecture.


Microprocessor architecture1

Microprocessor architecture

  • Microprocessor initiated operations

  • Internal operations

    Externally initiated operations

    To perform these functions microprocessor requires a group of logic circuits and set of signals called control signals.


Microprocessor initiated operations

Microprocessor initiated operations

  • Memory read

  • Memory write

  • I/O read

  • I/O write


Internal operations

Internal operations

  • Store 8-bit data

  • Perform arthimetic and logical operations

  • Test for conditions

  • Sequence the excuetion of operations

  • Store data temporarily during excuetion


8085 pin diagram

8085 pin diagram

Is 8 bit microprocessor, capable of addressing 64k of memory

Has 40 pins ,operate with 3mhz single phase clock

Require +5v of single power supply


8085 pin diagram1

8085 pin diagram


8085 pin diagram2

8085 pin diagram

Is 8 bit microprocessor, capable of addressing 64k of memory

Has 40 pins ,operate with 3mhz single phase clock

Require +5v of single power supply


Pin diagram conti

Pin diagram conti….

  • All the signals are classified into 6 groups

  • Address bus

  • Data bus

  • Control and status signals

  • Power supply and frequency signals

  • Externally initiated signals

  • Serial input output ports


Block diagram of 8085 microprocessor

Block diagram of 8085 microprocessor

  • It includes

  • Arithmetic and logic unit

  • Timing and control unit

  • Instruction register and decoder

  • Register array

  • Interrupt control

  • Serial input output control


8085 interrupt

8085 interrupt

  • What is interrupt?

  • Vectored interrupt

  • Non vectored interrupt

  • Enable and disable interrupt instructions

  • Pending interrupts


8085 interrupt1

8085 interrupt

  • Interrupt is a process where an external device can get the attention of the microprocessor.

    • The process starts from the I/O device

    • The process is asynchronous.

  • Classification of Interrupts

    • Interrupts can be classified into two types:

      • Maskable Interrupts(Can be delayed or Rejected)

      • Non-Maskable Interrupts (Can not be delayed or Rejected)

  • Interrupts can also be classified into:

    • Vectored (the address of the service routine is hard-wired)

    • Non-vectored (the address of the service routine needs to be supplied externally by the device)


Interrupts

Interrupts

  • An interrupt is considered to be an emergency signal that may be serviced.

    • The Microprocessor may respond to it as soon as possible.

  • What happens when MP is interrupted ?

    • When the Microprocessor receives an interrupt signal, it suspends the currently executing program and jumps to an Interrupt Service Routine (ISR) to respond to the incoming interrupt.

    • Each interrupt will most probably have its own ISR.


Interrupts1

Interrupts

  • When a device interrupts, it actually wants the MP to give a service which is equivalent to asking the MP to call a subroutine. This subroutine is called ISR (Interrupt Service Routine)

  • The ‘EI’ instruction is a one byte instruction and is used to Enable the non-maskable interrupts.

  • The ‘DI’ instruction is a one byte instruction and is used to Disable the non-maskable interrupts.

  • The 8085 has a single Non-Maskable interrupt.

    • The non-maskable interrupt is notaffected by the value of the Interrupt Enable flip flop.


8085 intrrupts

8085 intrrupts

  • TRAP

  • RST7.5

  • RST6.5

  • RST 5.5

  • INTR

  • INTA


Interrupt vectors and the vector table

Interrupt Vectors and the Vector Table

  • An interrupt vector is a pointer to where the ISR is stored in memory.

  • All interrupts (vectored or otherwise) are mapped onto a memory area called the Interrupt Vector Table (IVT).

    • The IVT is usually located in memory page 00 (0000H - 00FFH).

    • The purpose of the IVT is to hold the vectors that redirect the microprocessor to the right place when an interrupt arrives.


Microprocessor and interfacing

  • GENERAL PURPOSE PROGRAMMABLE PERIPHERAL DEVICES


Microprocessor and interfacing

  • 8255A Programmable peripheral interface

  • 8254 programmable interval timer

  • 8259 Programmable interval timer

  • 8237 DMA Controller


8255 programmable peripheral interface

8255 Programmable peripheral interface

  • It can be programmed to transfer data under various conditions.

  • It has 24 I/O pins.

  • The function of 8255A classified acc to two modes.

  • A) BSR mode

  • I/O mode


8255 programmable peripheral interface1

8255 Programmable peripheral interface

  • Block diagram of 8255A

  • Control word

  • BSR mode

  • Mode 0

  • Mode 1

  • Mode 2


Microprocessor and interfacing

  • Control Word

  • D7 D6 D5 D4 D3 D2 D1 D0

    0/1

    BSR Mode I/O Mode

    For port C Mode0 Mode 1 Mode2

    No effect on mode Simple I/O Handshake I/O

    for ports for ports A and or B

    A,B,C

  • Port C bits


8254 programmable interval timer

8254 Programmable interval timer


8237 dma controller

8237 DMA Controller

  • DMA is an input output technique used for high speed data transfer

  • Data transfer between system memory and floppy disk

  • It introduces two new signals that are

  • HOLD

  • HLDA


Dma controller cont

DMA Controller cont….

  • DMA Controller consists of

  • DMA channels and interfacing

  • DMA Signals

  • System interface

  • Programming the 8237

  • DMA Execution consists of

  • Master and slave mode


8086 microprocessor

8086 microprocessor

  • It is 16 bit microprocessor.

  • Contains 29000 transistors and is fabricated using HMOS technology.

  • Has addressing capacity of I megabyte.

  • Has 20 address pins.

  • +5v supply voltage


8086 arcitecture

8086 Arcitecture

  • Internal registers

  • Control logic

  • Instruction queue

  • ALU

  • PSW

  • Pointers

  • Segment registers


8086 pin diagram

8086 pin diagram


8086 effective address computations

8086 effective address computations

  • To provide flexible base addressing and indexing a data address may be formed by addressing together a combination of the BX or BP register contents SI or DI contents and a displacement.The result of such and address computation is called effective address.


8086 memory segmentation

8086 memory segmentation

  • Address within segments

  • Overlapping segments


Program relocation using cs register

Program relocation using CS register

  • If a programmer wants to relocate the program by any means ,he can relocate the program using cs register.


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