为什么程序输出P1口不能按程序输出电平
#include <REGX51.H>
void delay ()
{
unsigned char i,j;
for (i=0;i<255;i++)
for(j=0;j<255;j++);
}
void main()
{
unsigned char j=0XFE;
while(1)
{
j=(j<<1)|0X01;
if(j==0xff) j=0XFE;
P1=j;
delay();
j=0X55;
P1=j;
delay();
j=~j;
P1=j;
delay();
j=0X33;
P1=j;
delay();
j=~j;
P1=j;
delay();
j=0X11;
P1=j;
delay();
j=~j;
P1=j;
delay();
j=0X04;
P1=j;
delay();
j=~j;
P1=j;
delay();
}
}
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