c51单片机应用设计与技能训练

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1、2-1#includevoidmain(){unsignedcharctl;P1=0xff;while(1){ctl=P1;ctl=ctl&0X0F;switch(ctl){case0x0e:P1=0x7f;break;case0x0d:P1=0xbf;break;case0x0b:P1=0xdf;break;case0x07:P1=0xef;break;default:P1=0xff;}}}2-2#includemain(){unsignedinta,i,value,de

2、c;do{value=127;dec=64;for(i=0;i<8;i++){P0=value;for(a=0;a<15000;a++);value+=dec;dec/=2;}}while(1);}2-3#includesbitL1=P0^0;sbitL2=P0^1;unsignedcharoutput,L;delay(){unsignedinti,j;for(i=30;i>0;i--)for(j=500;j>0;j--);}voidmain(){P0=0xf9;L=P0&3;while(1

3、){delay();L&=3;output=P0&0xfc;output<<=1;output

4、=4;P0=output

5、L;delay();if(output==0x7c)L=~L,P0=0xfb&L;}}2-4#includesbitP32=P3^2;voidtemp0(void)voidmain(void){IT0=0;EA=0;EX0=1;while(1);}voidtemp0(void)interrupt0{unsignedcharout=0x7f;longi;while(1){i

6、f(P32==0){P0=out;for(i=200000;i>0;i--);out>>1;out

7、=0x80;if(out==0xff)out=0x7f;}Elsebreak;}IT0=1;}