You have no items in your shopping cart.

Subtotal: 0.00

User Manual for Seven Segment Display Card

Introduction to 7-Segment display

PS-ADD-ON 7SEG card has 6 Nos. number of Common Anode 7segment displays arranged in order with driver by using NPN transistors, All the 7-segment displays segment lines and digit selections and power lines are terminated with 20-pin connector, to interface development kits.

7-SEG Display Characteristics

  • The High Efficiency Red source color devices are made with Gallium Arsenide Phosphide on Gallium Phosphate Orange Light Emitting Diode.
  • 0.56 inch digit height.
  • Low current operation.
  • Excellent character appearance.
  • Easy mounting on P.C. boards or sockets.
  • Mechanically rugged.

Specifications

  • Digital Outputs
    - 6 Nos. of Common Anode ( 7-SEG) Display.
  • 20-pin Box Header
    - All LED and Switch | Power lines terminated at box connector
  • 20-pin FRC Cable
    - To connect host boards (Microcontroller/Processor/FPGA Kits)

Card Features

  • 6 Nos. common anode 7-segment Display
  • Transistors driver Circuit for displays
  • 20-pin Box Connector

Kit Includes

  • 7-SEG Display Card
  • Interface Cable
  • Datasheets | App notes

Hardware Description of seven segment display Card

7-Segment Display Card

  • 7-SEG Display card has 6 nos. of common anode 7segment displays arranged in order with driver by using NPN transistors, all the7-segment displays segment lines and digit selections and power lines are terminated with 20-pin connector, to interface development kits.
  • Standard: gray face, white segment.
  • RoHS compliant.

 

Hardware Configuration of 7 segments With 8051/8086/8085





WHAT IS A 7-SEG DISPLAY?





7-segment Display, it is composed of 8 LEDs, 7 segments are arranged as a rectangle for symbol displaying and there is an additional segment for decimal point displaying. In order to simplify connecting, anodes and cathodes of all diodes are connected to the common pin so that there are common anode displays and common cathode displays, respectively. Segments are marked with the letters from A to G, plus DP, as shown in the figure on the left. On connecting, each diode is treated separately, which means that each must have its own current limiting resistor.

A seven segment display, as its name indicates, is composed of seven elements. Individually on or off, they can be combined to produce simplified representations of the Arabic numerals. Often the seven segments are arranged in an oblique (slanted) arrangement, which aids readability. In most applications, the seven segments are of nearly uniform shape and size (usually elongated hexagons, though trapezoids and rectangles can also be used), though in the case of adding machines, the vertical segments are longer and more oddly shaped at the ends in an effort to further enhance readability.





7-segment Display TYPES AND DISPLAY FORMAT





The hex decimal data corresponding to the segments which have to glow for displaying a character is output to port B

Display Format

D7

D6

D5

D4

D3

D2

D1

D0

DP

G

F

E

D

C

B

A

Logic ‘0' in the above said format will turn ON that particular segment. Logic ‘1' will keep the segment OFF. The data for turning ON the display is through 8255.

 

7 – Segment Types

There are two types of seven segment display available, namely,

  • Common anode display and
  • Common cathode display



comman-anode-and-comman-cathode-display



PROGRAMS ON PS-ADDON 7 SEGMENT DISPLAY INTERFACE CARD

 

A) 7 – Segment Display Interfacing With 8051 Trainer Kit

 

IN 8051 WE HAVE SINGLE 8255 IC

GPIO- I (8255) J1 Connector

PORTS

ADDRESS

Control port

4003

PORT A

4000

PORT B

4001

PORT C

4002

 

Aim

Interface 7 Segment Display card with 8051 using 8255

 

Program: 1

 

ADDRESS

OPCODE

MNEMONICS

8500

78 80

START : MOV A,#80

8502

90 40 03

MOV DPTR,#4000

8505

F0

MOVX @DPTR,A

8506

74 FF

MOV A,#FF

8508

90 40 00

MOV DPTR,#4000

850B

F0

MOVX @DPTR,A

850C

12 85 14

LCALL DATA

850F

12 85 2C

LCALL DELAY

8512

80 F2

SJMP START

8514

7A 0F

DATA : MOV R2,#0A

8516

7B 86

MOV R3,#86

8518

7C 00

MOV R4,#00

851A

8C 82

MOV DPL,R4

851C

8B 83

MOV DPH,R3

851E

E0

MOVX A,@DPTR

851F

90 40 01

MOV DPTR,#4001

8522

F0

MOVX @DPTR,A

8523

12 85 2C

LCALL DELAY

8526

12 85 2C

LCALL DELAY

8529

0C

INC R4

852A

DA EE

DJNZ R2,851A

852C

78 FF

DELAY : MOV R0,#FF

852E

79 FF

LOOP : MOV R1,#FF

8530

D9 FE

LOOP1 : DJNZ R1,LOOP1

8532

D8 FA

DJNZ R0,LOOP

8534

22

RET



Lookup Table:

8600 C0H, CFH, A4H, B0H, 99H

8605 92H, 82H, F8H, 80H, 98H

Input:

Address location 4000 is for digit selection Address location 4001 is for 7 segment display data

Output:

view the output on 7 segment display card

B) 7 – Segment Display Interfacing with 8086 Trainer Kit

IN 8086 WE HAVE TWO 8255 IC’S

GPIO- I (8255)

PORTS

ADDRESS

Control port

FF26

PORT A

FF20

PORT B

FF22

PORT C

FF24

GPIO- II (8255)

PORTS

ADDRESS

Control port

FF36

PORT A

FF30

PORT B

FF32

PORT C

FF34

 

Aim:

Interface 7 Segment Display card with 8086 using 8255

Program: 2

ADDRESS

OPCODE

MNEMONICS

1200

B0 80

MOV AL, 80

1202

BA 36 FF

MOV DX, FF36

1205

EE

OUT DX, AL

1206

8D 36 00 13

START: LEA SI, [1300]

120A

B9 06 00

MOV CX, 000A

120D

B3 7F

MOV BL, 7F

120F

88 D8

AGN: MOV AL, BL

1211

BA 30 FF

MOV DX, FF30

1214

EE

OUT DX, AL

1215

8A 04

MOV AL, [SI]

1217

BA 32 FF

MOV DX, FF32

121A

EE

OUT DX, AL

121B

E8 07 00

CALL DLY

121E

46

INC SI

121F

D0 CB

ROR BL, 1

1221

E2 EC

LOOP AGN

1206

EB E1

JMP START

1225

BA FF FF

DLY: MOV DX, FFFF

1228

4A

M: DEC DX

1229

75 FD

JNZ M

122B

C3

RET



Lookup table:

1300 C0H, CFH, A4H, B0H, 99H,

1305 92H, 82H, F8H, 80H, 98H

Input:

Address location FF30 is for digit selection

Address location FF31 is for 7 segment display data

Output:

view the output on 7 segment display card

c) 7 – SEGMENT DISPLAY INTERFACING WITH 8085 TRAINER KIT (8085)

IN 8085 WE HAVE TWO 8255 IC’S

GPIO- I (8255) J1 Connector

PORTS

ADDRESS

Control port

23

PORT A

20

PORT B

21

PORT C

22

GPIO- I (8255) J4 Connector

PORTS

ADDRESS

Control port

33

PORT A

30

PORT B

31

PORT C

32

Aim:

Interface 7 Segment Display card with 8086 using 8255

Program: 3

ADDRESS

OPCODE

MNEMONICS

9100

3E 80

MVI A,80

9102

D3 23

OUT 23

9104

3E FF

START : MVI A,FF

9106

D3 20

OUT 20

9108

CD 11 91

CALL DATA

910B

CD 21 91

CALL DELAY

910E

C3 04 91

JMP START

9111

0E 0A

DATA : MVI C,0A

9113

21 00 92

LXI H,9200

9116

7E

REP : MOV A,M

9117

D3 21

OUT 21

9119

CD 24 91

CALL DELAY

911C

23

INX H

911D

0D

DCR C

911E

C2 16 91

JNZ REP

9121

C3 11 91

JMP DATA

9124

06 FF

DELAY : MVI B,FF

9126

3E FF

LOOP : MVI A,FF

9128

3D

LOOP1 : DCR A

9129

C2 28 91

JNZ LOOP1

912C

05

DCR B

912D

C2 26 91

JNZ LOOP

9130

C9

RET



Lookup table:

8600 C0H, CFH, A4H, B0H, 99H,

8605 92H, 82H, F8H, 80H, 98H

Input:

Address location 20 is for digit selection

Address location 21 is for 7 segment display data

Output:

view the output on 7 segment display card