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Interfacing Display with MPUwithout Peripheral Controller 

Dr A Sahu

Dept of Computer Science &Engineering

IIT Guwahati

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Outline• Peripheral communications

• Display

• LED Display – Decoder

 –

Generic model – Interfacing

• Character Display onitor – Decoder

 – Generic odel• Graphics monitor

 – !hy graphics" #ector #s $aster

•

%eyoard type and Interfaces

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Introduction

• Peripherals ' (D monitor) *+, spea-er

•Interfaces : IntermediateHardware – Nvidia GPU card !reative "ound

#laster card

•

Processor

$%M

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&ransmission controller•

 Transmission Controller' – MPU control) De0ice Control 3DA4

•  Type of I5 mapping – Peripheral 'IN(Out4) emory mapped I5 3LD.ST)#4

• 6ormat of communication – "ynchronous 3T & $ sync with cloc-4)

%synchronous

• ode of Data Transfer

 – Parallel) Serial 31A$T4• Condition for data transfer

 – Uncond)) Polling) Interrupt) $eady signal)(andsha-e

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Display

  * "eg + "eg ,- "eg ./0 DotMati/

0/* +/,,

Dot Matri/ DisplayPanel 10/23 character

monitor

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Generic Model 'Data4 ofDisplay

Data%"!II(#!D

DecoderOrMemory

Display

Monitor(56Ds

&ime to Decode &ime to Display

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* "egment 56DInterfaces

• Data to 7 Segment Decoder

a

7

c

d

e

f 

g

!ommon

!athode

a

7

c

f 

g

e

d

D

!

#

%

5&

$#I#I

Decoder

08

1

0

0

0

1

0

1

1

10

1

5

0

v

08

1

1

1

1

11

1

5

0

v

$#O

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Multiple * "egment 56DInterfaces

• Data to 7 Segment Decoder

 a c d e f g

  D C 2 A

 $2I $25

 a c d e f g

  D C 2 A

 $2I $25

 a c d e f g

  D C 2 A

 $2I $25

 a c d e f g

  D C 2 A

 $2I $25

 a c d e f g

  D C 2 A

 $2I $25

 *#

8 8 8 8 8 8 88

8 8 ,,

8 8 88

8 , ,,

,8

#lan9 

8

#lan9 

, ,

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Multiple/ed line andMemory use

98 2it dataline

: 2it dataline

8 ,; < 9

Data ,Data ;Data

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Multiple/ed line(Memoryused

7 SegmentDecoder

,'/ Decoder

Counte

r

$A

*=8

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Interface 56D DisplayUsing Delay

• !rite a program to display contentsof 2)C)D and E register to LED display

• !rite to u>er memory to display to7 Seg+ LEDs

• 1se address 6C ()6D ()6E ( and 66 (to display

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Interface Diagram

56Ds#uer

Memory

%ddressline

CS

!$ $D

Datalines

Ctr

7 Seg+

Decoder

MPU

A7A?A*A9A<A;

79LS

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Monitor program

• Interface program to Display contentof 2)C)D and E after , Sec Delay

DIS' #I A)251T 6C(#I A)C51T 6D(#I A)D

51T 6E(#I A)E51T 66(CALL DELA@ ,sec delay

 BP DIS

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Multiple/ed 10/23 !harDisplay

10/23 character

monitor

C A T

6 I $ E

  8 , ; < 9 ++ 7:

7=8,;

;<;9

A

Decoder

Or$OM

Memory

Decoded 2its

$ow

!tr

!ol

!tr

!5; <

03H=/10/23

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Generic Model of !harMonitor

• Delay of onitor is ,.*8 Sec) After E0ery *8Second it ma-es ready

• 6rom stream u>er it writes to 6rame u>er after

getting command+ 36lush stream command4

!har

>rame#uer

Memory

%ddressline

CS

!$

Datalines

Counter

Stream2u>er

!henC8$eady

Address3r)c4

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"peed of Display• LED is 0ery high speed

 – @ou can write to LEDs at 0ery high speed

 – Display meant for to see some thing 3Is it good"4

•

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Migration from !har toGraphics(8ideo

• Char display 3:8F;* char)*F7piFel988F,7*4

• C$T onitor 3988F?88)

?98F9:8)?88F:884• LCD onitor 3,8;9F7?:),;:8F,8;9)

4

• Graphics 0isually more appealing• Display Line) Circle) $ectangle)

Cur0e) Polygon – Character using this primiti0es

$EDA$$5! Circle

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Multiple/ed ,31?/*-2 pi/eldisplay

,31?/*-2 Pi/el

5!D

8 , ; < 9 ++

,8;rame#uer

$efresh screen 03time a "ec

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>rame #uer ', #itPi/el4: Grey

PiFels in6rame 2u>er

, 2it PerPiFels

PiFels ontheScreen

Graphical representation of ,it color

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>rame #uer ',0 #itPi/el4

PiFels in6rame 2u>er

PiFels ontheScreen

,* 2it Per PiFels

Graphical representation of ,07it color

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>rame #uer '1? #itPi/el4

PiFels in6rame 2u>er

PiFels ontheScreen

;9 2it Per PiFels

Graphical representation of 1?7it color

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,7it 2 7it A ,- 7it color

,H it color :Hit color ,?Hitcolor

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Graphics

• 8ector graphics: – 1se geometrical primiti0es ased

on mathematical eKuations) torepresent images in computer

graphics – Points) Lines) Cur0e) shapes or

Polygons

• $aster Graphics'Complementary to #ectorGraphics – $epresentation of images as an

array of piFels

 –  photographic images

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8ector graphics•

Store the primiti0es in the 6ILE – !ord) Photoshop) g) G/1Plot) PS)

(TL Tag

•

$aster' Store the PiFel 0alues in the6ILE – 2P) P/G) BPG

•

At runtime) process the primiti0eand generate PiFel to raster thescreen 3Display4

• !ho do this" – Software

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!haracter 8s >ont• Computer font formats' TrueType

6ont – !here each letter is created from 2Mier

cur0es

• any 0arieties of font for a character1nits

Points withunit and cur0eproperties are

stored

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Graphics !ards

• GP1 ' specialied processor thataccelerates

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Graphics "ystem

Memory"ystem

&e/tureMemory

>rame#uer

8erte/Processi

ng

Pi/elProcessi

ng

8ertices'/y=4

Pi/el$ G#

8erte/

"hadder

Pi/el"hadder

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;ey7oard

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$eference• $ S Gaon-ar) Oicroprocessor Architecture) 1nit II

preface) Chapter ,9 and ,7

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