{
uchar send_buf[8], *send_ptr;
int send_size;

// somewhere in main activate transmit:
ES=0;
send_prt=send_buf;
send_size=8;
TI=1;
ES=1;
while(send_size != 0) ;  // wait till transmit be done
// blabla
}

// inside serial interrupt routine
{
if (TI)
{
  TI=0;
  if (send_size)
  {
    SBUF= *send_ptr++;
    send_size--;
  }
}
if (RI)
{
//....
}
}