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电梯内外按键，按下任一按键，系统将根据当前位置响应用户要求；

sbit F1U=P1^1;sbit F2D=P1^2;sbit F2U=P1^3;sbit F3D=P1^4;sbit F3U=P1^5;sbit F4D=P1^6;sbit F4U=P1^7;sbit F5D=P3^0;sbit F5U=P3^1;sbit F1=P2^0;sbit F2=P2^1;sbit F3=P2^2;sbit F4=P2^3;sbit F5=P2^4;sbit F6=P2^5;sbit ledu=P3^7;sbit ledd=P3^6;sbit ledx=P2^3;sbit a1=P2^4;sbit a2=P2^5;sbit a3=P2^6;sbit a4=P2^7;bit dir=1,stop=0;unsigned char nf=1;unsigned char cf=1;unsigned char df;unsigned char tf;unsigned char flag,count=0,i=0;unsigned int timer1=0,timer2=0;unsigned char call_floor[7]={0,0,0,0,0};unsigned char const sequencea[8]={0x2F,0x6F,0x4F,0xcF,0x8F,0x9F,0x1F,0x3F};

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