FET-TMS470R1B1M: *** error 65: access violation at 0xFFFFF70C: no 'write' permission.

I am trying to write in system moudle configuration register(PCR), and while in simulator mode, i am getting this error:
*** error 65: access violation at 0xFFFFF70C: no 'write' permission

code is as follows

main(void)
{
pSM->PCR = CLKDIV_2;
pSM->GCR = ZPLL_CLK_DIV_PRE_1;
pSM->PCR |= PENABLE;
}

pSM is pointer to System module structure having all registors at corresponding address.

I think problem might be because i am in user mode, so also let me know how to switch between user mode and supervisor mode.

--Deepak