以16进制发送一个0-255之间的任一数，当单片机收到后在数码管上动态显示出来，波特率为4800b

Answer 1

#include<reg51.h>
#define uchar unsigned chara
char code table[]={0xc0,0xf9,0xa4,0xb0,0x99,0x92,0x82,0xf8,0x80,0x90};//共阳级数码管码表0-9
uchar dat,bai,shi,ge,scan;
void delay(uchar a)
{
uchar i;
while(a--)
for(i=0;i<120;i++);
}
void uart() interrupt 4
{
if(RI)
    {
    RI=0;
    dat=SBUF;
    bai=dat/100;
    shi=dat%100/10;
    ge=dat%10;
    }
}
main()
{
TMOD=0x20;
SCON=0x50;
TH1=0xfa;
TL1=0xfa;
TR1=1;
ES=1;
EA=1;
while(1)
    {
    P2=0x01;
    P0=table[bai];
    delay(5);
    P2=0x02;
    P0=table[shi];
    delay(5);
    P2=0x04;
    P0=table[ge];
    delay(5);
    }
}