Thanks for your responses,

I figured out what it was i wanted to accomplish.
The program reads the eeprom. The size of the eeprom depends on the user's input which is stored in sizehigh, and sizelow in Ram addr 04Eh, 04Fh.

i merely wanted to compare these two bytes to the dptr in order to
stop the program when the eeprom was read to the end. So when the dptr gets to the end of the eeprom, the program stops.

I did not know that it was possible to use the b register for storage.

mov a, dpl
mov b,sizelow ;
cjne a,b,keepreading ;
mov a, dph ; check high byte
mov b,sizehigh ;
cjne a,b,keepreading ; jump if not last
sjmp stop_program