#includesbit a2=P2^0;//開關(guān)unsigned int s,z;void main(){a2=1;//賦值高電平while(1)  //循環(huán){if(a2==0)   //判定為低電平執(zhí)行語句{for(s=60000;s>0;s--)for(z=20;z>0;z--);   //延時(shí)}if(a2==1)   //判定為高電平執(zhí)行語句{P1=0xff;  //給P1口輸出高電平s=60000;z=20;  //s重新賦值60000 z重新賦值20}if(s==0)  //判定s為0執(zhí)行語句{P1=0x00;  //點(diǎn)亮P1口}}}按鍵次數(shù) #include< reg52.h>sbit a=P2^0;unsigned int s,z;void cccc()//子程序{s++;}void main()//主函數(shù){a=1;while(1){if(a==0){cccc();a=1;}if(s==5){P1=0x00;}}}