The bytes you can define in internal memory become part of the program image as a result of processing the source code by the assembler if the code is written in assembly language. The data in the external memory, which is typically RAM cannot be set directly by DB or DW statements in the assembler language source.

What you have to do instead is to define the data in code memory space and then when your program wakes up and initializes you would have some kind or loop or a series of instructions to copy the data from the code space with MOVC instructions to the external memory space with MOVX instructions.

Good Luck
Michael Karas