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I am new to keil,just give me some basic idea about initilizations involved.
These registers does not have anything with the PLL or UART to do (except the common factor that they do require an oscillator). They are for the real-time clock (RTC).
The user manual does give good examples of how they are used. Based on your very short comments, I have to assume that you are avoiding to read the user manual. Why? You will not get anywhere without spending time with it. There is no way you can get sample code from the net, and be able to make something meaningful with the sample code, without _you_ reading up on the user manual so you understand what the chip does. And when you do, then you will suddenly not need to ask for sample code for everything, because you will know how to write the code yourself.
The user manual has one chapter for the PLL. One for the UART. Another for the RTC. Each chapter is well written, and have enough information (together with the information about interrupt handling) to make use of your processor.