; 輸出 50% (50:50) 占空比 PWM
; 輸出 10% (10:90) 占空比 PWM
; 輸出 90% (90:10) 占空比 PWM
       ORG   0000H
       ljmp  LOOP
       ORG   0030H
OUTPUT equ   P1.0

Loop:  clr   OUTPUT
       mov   a, #50
       Acall  Delay
       setb  OUTPUT
       MOV   A, #50
       Acall  Delay
       Sjmp  Loop
Delay: 	djnz	acc,$
	mov   r0, #0
DLoop:	djnz  r0,DLoop
      djnz  acc, DLoop
    ret

       end