Integrate EEPROM to MCU flash memory.

[Sergejs]

Is it possible to expand MCU Flash memory with external EEPROM?

[BenR]

If you mean use EEPROM to store additional program instructions. In theory this could be done but it would likely require a complex routine to fetch the instructions from the EEPROM and then a) parse the instructions one by one or b) write them onto a section of the internal flash to be executed in the normal manner. Both of these would likely be fairly slow and option b would likely burn out the internal flash memory after 10,000 to 100,000 erase/write cycles.