跑马灯23.asm

单片机写的程序都含有Protues仿真结果

   org 0000h           
      clr p3.0
      clr p3.1
      clr p3.2
   r: mov a,#0f0h       
      mov p0,a
      lcall delay
      mov a,#0fh
      mov p0,a
      lcall delay     
      ljmp r
delay:mov r1,#10
  kk3:mov r2,#100
  kk2:mov r3,#100
  kk1:djnz r3,kk1
      djnz r2,kk2
      djnz r1,kk3
      ret
      end