RS 232

RS 232 IS NOT WORKING

Hi, I have done programing of rs 232 with lpc 2378(uart0).In the hardware DB 9connectors TXD and RXD are connected together(loop back test) for testing hardware.The code is as follows void main() {
PINSELO|=0X00000050; U0FDR=0;
U0LCR=0X83; 8 databit,1 stopbit,no parity
U0DLL=78; 9600 baudrate
U0DLM=0;
U0LCR=0X03;
while(1)
{ U0THR='a';
while(!(U0LSR&0x40));

}
} The character' a' is not displayed in serial window0 .what will be the reason and why?is there any problem with code.please provide valuable suggestions

Thanks in Advance

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