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The definition of CPU core register?

Hi All

I am using tms570ls 1227.

A silly question: I saw r1 r6 and others many times in the .asm file, but where are these variables defined? what are the value of them?
What the meaning of these CPU core registers (all modes R0-R15, PC, CPSR)?

Can you privide the link or literatue for me? 

Many thanks

Leo