what is wrong on the following source code. the compiler don´t say an error.

#include <at89S8252.h>

void main()
{
//Baudrate 9600, f=12MHZ 8
//Bit Datenübertragung;
SCON = 0x50; //Modus 1, 8 Bit
RCAP2L = 0xD9; //Reload-Wert
RCAP2H = 0xFF; //9600 Baud
T2CON = 0x34; //Reloadmodus 0
ES=1;
EA=1;
while(1)
{
ACC = 0x0F;
SBUF = ACC;

do
{

} while(TI==0);
TI = 0;
}
}

The controller doesn't send datas. What else could the mistake be?