基于51单片机的“叮冬”门铃设计

                            JB FLAG,STP
                            CPL FLAG
                            LJMP NEXT
STP:                    SETB STOP
                            CLR TR0
                            LJMP DONE
NEXT:                JB FLAG,S5HZ
                            INC T7HZ
                            MOV A,T7HZ
                            CJNE A,#03H,DONE
                            MOV T7HZ,#00H
                            CPL P1.0
                            LJMP DONE
S5HZ:                 INC T5HZ
                            MOV A,T5HZ
                            CJNE A,#04H,DONE
                            MOV T5HZ,#00H
                            CPL P1.0
                            LJMP DONE
DONE:                RETI
                            END
7．C语言源程序
#include
unsigned char t5hz;
unsigned char t7hz;
unsigned int tcnt;
bit stop;
bit flag;
void main(void)
{
  unsigned char i,j;
  TMOD=0x02;
  TH0=0x06;
  TL0=0x06;
  ET0=1;
  EA=1;
  while(1)
    {
      if(P3_7==0)
        {
          for(i=10;i>0;i--)
          for(j=248;j>0;j--);
          if(P3_7==0)
            {
              t5hz=0;
              t7hz=0;
              tcnt=0;
              flag=0;
              stop=0;
              TR0=1;
              while(stop==0);
            }
        }
    }
}
void t0(void) interrupt 1 using 0
{
  tcnt++;
  if(tcnt==2000)
    {
      tcnt=0;
      if(flag==0)
        {
          flag=~flag;
        }
        else
          {
            stop=1;
            TR0=0;
          }
    }
  if(flag==0)
    {
      t7hz++;
      if(t7hz==3)
        {
          t7hz=0;
          P1_0=~P1_0;
        }
    }
    else
      {
        t5hz++;
        if(t5hz==4)
          {
            t5hz=0;
            P1_0=~P1_0;
          }
      }
}

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本文关键字：单片机  51单片机，单片机-工控设备 - 51单片机