Although the layout could be clearer:

void main( void ) 
{ 

   PORTECFG = 0x08; //Turn on uart pin rxd0out. 
   SCON0    = 0x13; //Mode 0, baud 24/12, enable receive, TI=1, RI=1. 

   while(1) 
   { 
      TI    = FALSE; 
      SBUF0 = 'B';   //spi_Data; 

      while( !TI ); 
   } 
}

In that first line you say, "Turn on uart pin rxd0out"
You don't mention turning-on the TxD pin - does this chip require you to turn on (or otherwise configure) the TxD pin?