Hello Anitha,
MPC5606B has not independent NV memory. MPC has Code and Data flash which are non-volatile and SRAM which is volatile. About using and configuration flash memory please look at the reference manual chapter 30.
http://cache.freescale.com/files/32bit/doc/ref_manual/MPC5607BRM.pdf?fsrch=1&sr=1&pageNum=1
For working with flash memory you can also use flash standard software driver which you can find here:
MPC560xB|32-bit MCU|Body-Electronic|Freescale
Regards,
Martin