The internal ram in the aduc848 is not non-volatile. What gave you the impression that it is? Whilst I'm not familiar with the aduc848, I have used the aduc834 and it has eeprom internally. This is what I use to store various setup and configuration information. You need to write code to read and write to the eeprom. You also need to understand how the eeprom works - write to it too much and you will wear it out. Read the datasheet and app notes that will explain all about this.

Also, you may be able to make the aduc848's ram non-volatile by adding some circuitry and a battery that keeps the chip powered but in a low power state (sleep).