led-3.dt

义隆单片机控制8个LED的渐明渐暗

      port6  equ 0x06
      
;--------------------------------------
      
      org     0x00
      jmp     start
      org     0x10
start:
      mov     a,@0xf7     ;初始化
      iow     port6       ;P5口作为输出口
      mov     a,@0x0f7
      mov     port6,a     ;点亮P5.0的灯
      call    delay       ;延时
      mov     a,@0x08 
      mov     port6,a     ;灯灭
      call    delay
      jmp     start
delay:                    ;延时
      mov     a,@20
      mov     0x15,a
delay1:
      mov     a,@250
      mov     0x16,a
delay2:
      nop
      djz     0x16
      jmp     delay1
      djz     0x15
      jmp     delay2
      ret
      end