51单片机学习（5）3-2 独立按键控制LED状态

#include<REGX52.H>

void Delay1ms(xms) //@11.0592MHz

{

unsigned char i, j;

while(xms)

{

i = 2;

j = 199;

do

{

while (--j);

} while (--i);

xms--;

}

}

void main()

{

while(1)

{

if(P3_1==0)

{

Delay(20);

wihle(P3_1==0);

Delay(20);

P2_0=~P2_0;

}

}

}