The task was to;

• Display an Alphabet using a 7 segment display (common cathode and common)interfaced with an At89c51 microcontroller and programmed in assembly language.
• Create a counter using 7 segment display interfaced with an At89c51 microcontroller and programmed in assembly language to count from 0-9

For common cathode:

Circuit diagram:

Code:

Results:

For Common Anode:

Circuit diagram:

Code:

Results:

The link below is the simulation file for both common cathode and common anode on Proteus:

Common Cathode:

https://drive.google.com/file/d/19IpwIHLemsC7s_CIEAHTVeJf6axDF6G-/view?usp=drivesdk

Common Anode:

https://drive.google.com/file/d/19IVHOIyIhEj9wG_pZAcIXilZQYZxkWRR/view?usp=drivesdk

For the counter:

Code
ORG 000H

START:

MOV A, #00001001B

MOV B, A

MOV R0, #0AH

LABEL:

MOV A, B

INC A

MOV B, A

MOVC A, @A+PC

MOV P2, A

CALL DELAY

DEC R0

MOV A, R0

JZ START

SJMP LABEL

DB 3FH

DB 06H

DB 5BH

DB 4FH

DB 66H

DB 6DH

DB 7DH

DB 07H

DB 7FH

DB 6FH

DELAY:

MOV R4, #05H

WAIT1: MOV R3, #00H

WAIT2: MOV R2, #00H

WAIT3: DJNZ R2, WAIT3

DJNZ R3, WAIT2

DJNZ R4, WAIT1

RET

END.

Below is a link to the Proteus simulation and code used:

Simulation;

https://drive.google.com/file/d/19KWIgE1wfpv-rI6sgvuAasKJgpBbl4n5/view?usp=drivesdk

Code;

https://drive.google.com/file/d/19P5iDe12r8jpzX1GVZFDzwbEd5uz_Gda/view?usp=drivesdk