请问为什么有个警告
#include<reg52.h>#include<intrins.h>
unsigned char t,num,temp;
unsigned char code table[]={0xfa,0xf5,0xaf,
0x5f,0xaa,0x55,0x00,0xff};
void main()
{
num=0;
EA=1;
ET0=1;
TMOD=0X00;
TH0=(65536-50000)/256;
TL0=(65536-50000)%256;
TR0=1;
temp=0xfe;
P1=temp;
while(1)
{
;
}
}
void time0() interrupt 1
{
TH0=(65536-50000)/256;
TL0=(65536-50000)%256;
if(++t>=30)
{
t=0;
num++;
if(num>7)
num=0;
temp=_crol_(temp,1);
P1=temp;
}
}