port_p1.asm

来自「使用proteus和Keil联调SCM51,此例程精讲了P0口匚用」· 汇编 代码 · 共 17 行

       org 00H
  loop:mov a,#0feh
       mov 	r2,#8
output:mov p1,a
       rl a
	   acall delay
	   djnz r2,output
	   ljmp loop
delay:mov r6,#0
	  mov r7,#0
delayloop:
      djnz r6,delayloop
	  djnz r7,delayloop
	  ret
	  end