Moving Display

In this lesson, we are going to drive 8 x7 segmen, in this way you can write eight character on multi 7 segmen. We used a multiplexing methode to transfer data for driver transistor consequtively.

Step 1st
Build the circuit as shown in figure 2.3.5. As you seen on figure 2.3.5. P2.0 trough P2.7 is connected to driver transistor, and all eight 7 segment is connected to P0.0 trough P0.6 parallelly. Remember, that all we want to do with this lesson is to write ( k-O-n-P-U-t-E-r ) to 1st, 2nd, 3rd, 4th, 5th, 6th, 7th and 8th 7 segmen each sifting the word to the left.

Step 2nd
In this step, you must tipe the assembly program to make your 7 segmen shown some number on 7 segmen, we assume that you have already known the editor, we used RIDE-51 to edit the program.

       org 0h
Begin: mov r1,#150
start1: mov dptr,#word1
      mov r5,#8
      mov r2,#01111111b
again1: clr A
      movc A,@A+dptr
      inc dptr
      mov p2,A
      mov A,r2
      mov p3,A
      rr A
      mov r2,A
      acall delay
      mov p2,#11111111b
      djnz r5,again1
      djnz r1,start1
      mov r1,#150
start2: mov dptr,#word2
      mov r5,#8
      mov r2,#01111111b
again2: clr A
      movc A,@A+dptr
      inc dptr
      mov p2,A
      mov A,r2
      mov p3,A
      rr A
      mov r2,A
      acall delay
      mov p2,#11111111b
      djnz r5,again2
      djnz r1,start2
      mov r1,#150
start3: mov dptr,#word3
      mov r5,#8
      mov r2,#01111111b
again3: clr A
      movc A,@A+dptr
      inc dptr
      mov p2,A
      mov A,r2
      mov p3,A
      rr A
      mov r2,A
      acall delay
      mov p2,#11111111b
      djnz r5,again3
      djnz r1,start3
      mov r1,#150
start4: mov dptr,#word4
      mov r5,#8
      mov r2,#01111111b
again4: clr A
      movc A,@A+dptr
      inc dptr
      mov p2,A
      mov A,r2
      mov p3,A
      rr A
      mov r2,A
      acall delay
      mov p2,#11111111b
      djnz r5,again4
      djnz r1,start4
      mov r1,#150
start5: mov dptr,#word5
      mov r5,#8
      mov r2,#01111111b
again5: clr A
      movc A,@A+dptr
      inc dptr
      mov p2,A
      mov A,r2
      mov p3,A
      rr A
      mov r2,A
      acall delay
      mov p2,#11111111b
      djnz r5,again5
      djnz r1,start5
      mov r1,#150
start6: mov dptr,#word6
      mov r5,#8
      mov r2,#01111111b
again6: clr A
      movc A,@A+dptr
      inc dptr
      mov p2,A
      mov A,r2
      mov p3,A
      rr A
      mov r2,A
      acall delay
      mov p2,#11111111b
      djnz r5,again6
      djnz r1,start6
      mov r1,#150
start7: mov dptr,#word7
      mov r5,#8
      mov r2,#01111111b
again7: clr A
      movc A,@A+dptr
      inc dptr
      mov p2,A
      mov A,r2
      mov p3,A
      rr A
      mov r2,A
      acall delay
      mov p2,#11111111b
      djnz r5,again7
      djnz r1,start7
      mov r1,#150
start8: mov dptr,#word8
      mov r5,#8
      mov r2,#01111111b
again8: clr A
      movc A,@A+dptr
      inc dptr
      mov p2,A
      mov A,r2
      mov p3,A
      rr A
      mov r2,A
      acall delay
      mov p2,#11111111b
      djnz r5,again8
      djnz r1,start8
      ljmp begin
;
delay: mov r3,#10
delay1: mov r4,#10
      djnz r4,$
      djnz r3,delay1
      ret
;
word1: db 10001010b,11000000b,11001000b,10001100b
     db 11000001b,10000111b,10000110b,11001110b
word2: db 11000000b,11001000b,10001100b,11000001b
     db 10000111b,10000110b,11001110b,10001010b
word3: db 11001000b,10001100b,11000001b,10000111b
     db 10000110b,11001110b,10001010b,11000000b
word4: db 10001100b,11000001b,10000111b,10000110b
     db 11001110b,10001010b,11000000b,11001000b
word5: db 11000001b,10000111b,10000110b,11001110b
     db 10001010b,11000000b,11001000b,10001100b
word6: db 10000111b,10000110b,11001110b,10001010b
     db 11000000b,11001000b,10001100b,11000001b
word7: db 10000110b,11001110b,10001010b,11000000b
     db 11001000b,10001100b,11000001b,10000111b
word8: db 11001110b,10001010b,11000000b,11001000b
     db 10001100b,11000001b,10000111b,10000110b
end     
     end

Step 3rd
Safe your assembly program above, and name it with *.asm (for example) Compile the program that you have been save by using RIDE-51, see the software instruction.

Step 4th
Download your hex file ( *.hex ) into the microcontroller by using Microcontroller Laros ATMEL ISP software, see the instruction.After download this hex file you'll see the action of the 7 segmen( of course if your cable connection and your program are corrected ).