Shifting LEDs Pattern with AT89S52 in Assembly _ Best Embedded Tutorial

Shifting Effect can be formed on LEDs by just turning each LED individually with remaining Off for the meanwhile.

Here is the simple code for forming such shifting pattern.

MOV A, #10000000B

     AGAIN:RR A

MOV P2, A

ACALL DELAY

SJMP AGAIN

DELAY:                                        //Program for delay

 MOV  R1, #10

 MOV  R2, #10

 MOV  R3, #2

LOOP1: DJNZ R3, LOOP1

               DJNZ R2, Y2

               DJNZ R1, Y3

RET

END

/*You may program in simple way if you find the first one messy

AGAIN:

MOV P2,#10000000B

ACALL DELAY

MOV P2,#01000000B

ACALL DELAY

MOV P2,#00100000B

ACALL DELAY

MOV P2,#00010000B

ACALL DELAY

MOV P2,#00001000B

ACALL DELAY

MOV P2,#00000100B

ACALL DELAY

MOV P2,#00000010B

ACALL DELAY

MOV P2,#00000001B

ACALL DELAY

SJMP AGAIN

DELAY:                                        //Program for delay

 MOV  R1, #10

 MOV  R2, #10

 MOV  R3, #2

LOOP1: DJNZ R3, LOOP1

               DJNZ R2, Y2

               DJNZ R1, Y3

RET

END

                                        Both programs will have same output

*/