Keyboard Interfacing With 8086 Using 8255 Pdf Download

Keyboard Interfacing With 8086 Using 8255 Pdf Download

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Keyboard Interfacing With 8086 Using 8255 153.pdf. (2010). Raul Goodrich. Image. Download. AddThis Sharing Buttons. Share to Facebook .... How many memory locations are available in 8086 microprocessor? (May 2012). 12. ... What are the modes used in keyboard display interface? (May 2015). 7.. Interfacing Examples Using 8255 PPI ... configuration of the 82C55A make it compatible with the 8086. 3 ... programmed in Mode 1 to monitor a keyboard or tape.

Module 3: Interfacing with 8086 (8). Interfacing with RAMs, ROMs along with the explanation of timing diagrams. Interfacing with peripheral ICs like 8255, 8254, .... peripherals like 8255 PPI, multiplexed 7-seg display & matrix keyboard interface using 8255. Programmable Keyboard/Display controller 8279, Organization, ...

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Preamble: Microprocessor and Microcontroller have become important building blocks in digital electronics design. It is important for student to understand the architecture of a microprocessor and its interfacing with various modules. 8086 microprocessor architecture, programming, and interfacing is dealt in detail in this course. Interfacing, PIC, architecture, programming in C.

Procedure: 8279 chip has two portions one for providing scanneddisplay interface for LED and the other for interfacing withkeyboards or an array of sensors. In the absence of this chip, theprocessor is fully involved in the detecting of key press anddisplaying of words. But with 8279, the processor has to just givethe commands and the 8279 takes care of all the activities. In caseof a valid key press, the code of the key enters into the FIFO RAM.At the same time, the count in the status register increments.While programming, the key press is detected by checking whetherthe count in the status register is incremented or not.

A program to identify a key pressed on hex keyboard interfacedthrough 8255 to 8086.CODE SEGMENT ASSUME CS:CODE, DS:CODE ORG 1000HROW_0 DB 0,1,2,3 ROW_1 DB 4,5,6,7 ROW_2 DB 8,9,0AH,0BH ROW_3 DB0CH,0DH,0EH,0FH CR EQU 0C6H PA EQU 0C0H PB EQU 0C2H MOV AL, 82H OUTCR, AL MOV AL, 0 OUT PA, AL KEYP: IN AL, PB AND AL, 0FH CMP AL, 0FHJZ KEYP CALL DELAY IN AL, PB AND AL, 0FH CMP AL, 0FH JZ KEYP ROW0:MOV AL, 0FEH OUT PA, AL IN AL, PB AND AL, 0FH CMP AL, 0FH JZ ROW1LEA SI, ROW_0 JMP COL_ID ROW1: MOV AL, 0FDH OUT PA, AL IN AL, PBAND AL, 0FH CMP AL, 0FH JZ ROW2 LEA SI, ROW_1

AIM:To Interface Digital -to-Analog converter to 8086 using 8255and write Assembly Language Program to generate Square Wave, RampWave, Triangular Wave & Staircase Wave form.APPARATUS:Microprocessor trainer kit, ADC kit, power supply, datacable, CRO etc THEORY:The DAC 0800 is a monolithic 8 bit high speedcurrent output digital to analog converters featuring setting timeof 100nSEC. It also features high compliance complementary currentoutputs to allow differential output voltage of 20 Vp-p with simpleresistor load and it can be operated both in unipolar and bipolarmode. FEATURES:1. 2. 3. 4. 5. 6. Fast setting output current 100nSFull scale error +/- 1 LSB Complementary current outputs easyinterface to all microprocessor Wide power supply range +/- 4.5 to+/- 18V low power consumption

; RAMP WAVE GENERATOR with 8086 using 8255 MODEL SMALL .STACK100 .DATA CONTROL EQU 0FFC6H ; Control port address for 8255 PORTAEQU 0FFC0H ; Port A address for 8255 PORTB EQU 0FFC2H ; Port Baddress for 8255 PORTC EQU 0FFC4H ; Port C address for 8255 .CODESTART: MOV AX,@DATA ;Initialize Data segment MOV DS,AX MOVDX,CONTROL MOV AL,80H ;Initialize all ports as output OUT DX,AL;Ports MOV BL,FFH ;Take FFH in BL analog equivalent to 5V RAMP :MOV DX,PORTB MOV AL,BL ;Copy to AL OUT DX,AL ;And output it on theport DEC BL ; To generate ramp wave this 5V is continuouslydecreased till 0V JNZ RAMP ; Jump to RAMP if not 0 MOV BL,FFH ; Togenerate same wave this procedure is repeated JMP RAMP INT 03H ENDSTART ;SQUARE WAVE GENERATOR with 8086 using 8255 MODEL SMALL.STACK 100 .DATA CONTROL EQU 0FFC6H ; Control port address for 8255PORTA EQU 0FFC0H ; Port A address for 8255 PORTB EQU 0FFC2H ; PortB address for 8255 PORTC EQU 0FFC4H ; Port C address for 8255 .CODESTART: MOV DX,CONTROL MOV AL,80H ; Initialize all ports as outputOUT DX,AL ; Ports UP: MOV DX,PORTB MOV AL,00H ;Output 00 for 0Vlevel CALL OUTPUT MOV AL,0FFH ;Output FF for 5V level CALL OUTPUTJMP UP

;TRIANGULAR WAVE GENERATOR with 8086 using 8255 MODEL SMALL.STACK 100 .DATA CONTROL EQU 0FFC6H ; Control port address for 8255PORTA EQU 0FFC0H ; Port A address for 8255 PORTB EQU 0FFC2H ; PortB address for 8255 PORTC EQU 0FFC4H ; Port C address for 8255 .CODESTART: MOV DX,CONTROL MOV AL,80H ; Initialize all ports as outputOUT DX,AL ; Ports BEGIN: MOV DX,PORTB MOV AL,00H ; Output 00 for 0Vlevel UP: CALL OUTPUT INC AL ; To raise wave from 0V to 5Vincrement AL CMP AL,00H JNZ UP ; Jump UP till rising edge isreached i.e. 5V MOV AL,0FFH UP1: CALL OUTPUT DEC AL ; To fall wavefrom 5V to 0V decrement AL CMP AL,0FFH JNZ UP1 ; Jump UP tillfalling edge is reached i.e. 0V JMP BEGIN OUTPUT: OUT DX,AL CALLDELAY INT 21H DELAY:

MOV CX,07H ;To vary the frequency alter the delay countLUP1:LOOP LUP1 INT 21H END START ;STAIRCASE WAVEFORM GENERATOR with8086 using 8255 MODEL SMALL .STACK 100 .DATA CONTROL EQU 0FFC6H ;Control port address for 8255 PORTA EQU 0FFC0H ; Port A address for8255 PORTB EQU 0FFC2H ; Port B address for 8255 PORTC EQU 0FFC4H ;Port C address for 8255 .CODE START: MOV DX,CONTROL MOV AL,80H;Initialize all ports as output OUT DX,AL ;Ports UP: MOV DX,PORTBMOV AL,00H ;Output 00 for 0V level CALL OUTPUT ; And wait for sometime MOV AL,0FFH ;Output FF for 5V level CALL OUTPUT ; And wait forsome time MOV AL,07FH ;Output 7F for 2.5V level CALL OUTPUT ; Andwait for some time JMP UP OUTPUT: OUT DX,AL MOV CX,FFH DELAY: LOOPDELAY ; To add DELAY INT 03H END START PROCEDURE:1. Connect powersupply 5V & GND to both microprocessor trainer kit & DACinterfacing kit. 2. Connect data bus between microprocessor trainerkit & DAC interfacing kit. 3. Enter the program to generateRamp, Square, Triangular & Staircase Wave. 4. Execute theprogram by typing GO E000:4770 ENTER for Ramp, GO E000:03A0 ENTERfor Square, GO E000:0410 ENTER for Triangular, GO E000:4890 ENTERfor Staircase. 5. Observe the wave forms on CRO. 2b1af7f3a8