I understood why PINSEL0 is used for P0_15 & PINSEL1 is used for P0_16 .
I tend to get confused when i see different codes being used for different Application notes.
PINSEL0 |= 0x00050000; // Select UART1 RXD/TXD
How TXD/RXD is being selected through PINSEL0 inspite it is clear that RXD OF Uart1 can be slected only by PINSEL1 ?