8251程序问题请帮看一看

都快一个月了，还是一点反应都没有，用串口调试助手发送和接收都为空其中T0用做8251对89C52的发送接收中断信号
#define _TEST_C_
#include "reg52.h"
#include "stdlib.h"
#include "absacc.h"
#include "intrins.h"
#include "test.h"
#define uchar unsigned char
#define uint unsigned int
#define COM8251 XBYTE[0x8601]
#define DAT8251 XBYTE[0x8600]
uchar data_temp[10]={0xAA,10,22,32,0,0};
uchar i,s;
void initmcu(void);
void main(void)
{ EA = 1;
initmcu();
COM8251 = 0x00;
COM8251 = 0x00;
COM8251 = 0x00;
COM8251 = 0x4e;
COM8251 = 0x37;
}
void initmcu(void)
{
TMOD = 0x06; //9600波特11.0592MHz,方式2
TL0 = 0XFF; TH0 = 0XFF;
TCON = 0x01; IP = 0x02; ET0 = 1;
}
void Trans8251() interrupt 1 using 2
{
for(;;)
{
for(i=0;i<4;i++)
{
do
{
s = COM8251;
}while((s&0x01)==0);
DAT8251 = data_temp;
}
for(i=0;i<4;i++)
{
do
{
s = COM8251;
}while((s&0x02) == 1);
}
data_temp = DAT8251;
}
}