void main()
{unsigned char KeyIn;
 while(1)
 {
  while(read165==0xff)KeyIn = 0xff;
  KeyIn =read165();
  switch(KeyIn){//按鍵的激發
  case 0xFE:P0_0=0;break;
  case 0xFD:P0_1=0;break;
  case 0xFB:P0_2=0;break;
  case 0xF7:P0_3=0;break;
  }
 }
}
P00=LOW;
P01=HIGH;
P02=HIGH;
P03=HIGH;
P04=HIGH;
P05=HIGH;

if(P00==HIGH){					   //有數據輸入，進行8421碼編譯
if(P04==LOW){N1=1;}
 else{N1=0;}
if(P03==LOW){N2=1;}
 else{N2=0;}
if(P02==LOW){N3=1;}
 else{N3=0;}
if(P01==LOW){N4=1;}
 else{N4=0;}
N=1*N1+2*N2+4*N3+8*N4;
Disp_Max7219(10,10,10,N,10,0,1,10);}
else{Disp_Max7219(15,15,15,15,10,0,1,10);}
delay(1);
if(P05==LOW){Disp_Max7219(10,12,12,10,10,0,1,10);}