Thank you for your response ronsimpson.
There is no manual for the board.
I have gone through the manual of the controller and have also seen the related topics.
I don't understand how to map the external Eeprom memory on the microcontroller memory.
I do understand the logic of accessing external Eeprom for data, but how do I read program code from it? How will the controller interpret it?
Also, where can I define the start of memory in controller, that maps onto external memory.