UART baudate selection in the LPCOPEN

[lpcware]

Content originally posted in LPCWare by dizgah on Mon May 02 00:30:34 MST 2016
whats differences between 2 below functions?

Chip_Clock_SetUSARTNBaseClockRate((115200 * 16), true);
Chip_UART_SetBaud(LPC_USART1, 115200);

As i know second is for setting baud rate,but i'm in doubt about first,why it must be ratio of 16? for 9.6 Kbps is 115200 must changed to 9600?
WBR.

[lpcware]

bump