UXDLL and U1DLL

Dear All,

Sorry if my question is easy :-)

I see of the differences FOR SERIAL PORT INIT between project

C:\Keil\ARM\Boards\Keil\MCB2300\Blinky

and project

C:\Keil\ARM\Boards\Keil\MCB2300\RTX_Traffic

In the first project I see

UxFDR = 0;
UxLCR = 0x83;
UxDLL = 78;
UxDLM = 0;
UxLCR = 0x03;

and in the second

U1LCR = 0x83;
U1DLL = 3;
U1FDR = 0x67;
U1LCR = 0x03;
U1IER = 0x03;

Why different between Ux and U1 ?

Thanks in advance

Miky