A programmable logic device unit, a non-volatile memory unit which stores data for programming the programmable logic device unit in a part of data storage area thereof and a control circuit which controls the non-volatile memory unit to allow the data stored in a part of the data storage area to be read at power-on time and supplied to the programmable logic device unit are integrally provided on a semiconductor chip. Based on the program data, the programmable logic device unit forms an interface for allowing the non-volatile memory unit to operate as at least one of a register, a flash memory, a random access memory, and a read-only memory.