Program for generation of Square wave

Program for generation of Square wave..

Following are the steps involved in generating Square wave using keil software

1.  Make ACCwith =00H
2. Load ACC to port1 ( select any port in available)
3. Call delay subroutine
4. Make ACC with = FFH
5. Load ACC to port1
6. Call delay subroutine
7. then repeat from first step again

Program:

                        org 2050H

       back:       cla a             ; acc loading with 00

                        move p1,a   ; moving 00 into port1

                        lcall delay   ; going to delay subroutine

                        move a.#FFh ; acc loading with FF

                        move p1,a    ; moving acc into port1

                         lcall delay   ; going to delay subroutine

                        sjmp back    ; repeating steps again

                        end              ;

         Delay:   move r1, #100h ;

                l1 :  nop            ; no operation

                       nop            ; no operation 

                       nop            ;no operation

                       nop            ;no operation

                       nop            ;no operation

                       djnz r1, l1 ; decreament  jump if not equal to zero

                       ret             ; returning