Struct for registers

Hello,

i'm using keil 3.05 evaluation, its my first experience with this tool.
Normally i found in other tools a struct inside the .h of the uproc. In this case i found just a define.

#define PCON (*((volatile unsigned char *) 0xE01FC0C0))

trying to create a structure, i dont know how to set the struct mem position. I've tried this code bellow without sucess.

/* Cria os bits da estrutura */
struct { unsigned int PLLE : 1; unsigned int PLLC : 1; unsigned int NotUsed : 6;
} PCONbits __at 0xE01FC0C0;

i'll have this libs with the full version of keil tools?

thanks!
Jose