首先为什么我的最后一位显示的比较亮，其次每次复位时显示255，最后怎么显示255以上的数字
#include<reg52.h>
#define uchar unsigned char
#define uint unsigned int
sbit dula=P2^6;
sbit wela=P2^7;
uchar code table[]={0x3f,0x06,0x5b,0x4f,0x66,0x6d,0x7d,0x07,0x7f,0x6f,0x77,0x7c,0x39,0x5e,0x79,0x71};
uchar flag;
uint num;
void display(uchar,uchar,uchar,uchar,uchar);
void delay(uchar);
main()
{
EA=1;
ES=1;
TMOD=0x20;
TH1=0xfd;
TL1=0xfd;
TR1=1;
REN=1;
SM0=0;
SM1=1;
while(1)
{
display(num/10000,num%10000/1000,num%10000%1000/100,num%10000%1000%100/10,num%10);
if(flag==1)
{
ES=0;
flag=0;
SBUF=num;
while(!TI);
TI=0;
ES=1;
}
}
}
void ser() interrupt 4
{
num=SBUF;
RI=0;
flag=1;
}
void delay(uchar z)
{
uchar x,y;
for(x=z;x>0;x--)
for(y=110;y>0;y--);
}
void display(uchar wan,uchar qian,uchar bai,uchar shi,uchar ge)
{
dula=1;
P0=table[wan];
dula=0;
wela=1;
P0=0xfe;
wela=0;
delay(1);
dula=1;
P0=table[qian];
dula=0;
wela=1;
P0=0xfd;
wela=0;
delay(1);
dula=1;
P0=table[bai];
dula=0;
wela=1;
P0=0xfb;
wela=0;
delay(1);
dula=1;
P0=table[shi];
dula=0;
wela=1;
P0=0xf7;
wela=0;
delay(1);
dula=1;
P0=table[ge];
dula=0;
wela=1;
P0=0xef;
wela=0;
}