Microcomputer and microprocessor having flash memory operable from single external power supply

A semiconductor integrated circuit device on a semiconductor substrate, comprising:

• a processing unit;
• an electrically erasable and programmable non-volatile memory including a memory array and a peripheral circuit which controls a read operation, an erase operation and a programming operation of the memory array, wherein the memory array includes a plurality of electrically erasable and programmable non-volatile memory cells, each of which has a layer to store electrons, wherein the memory array has a first area to be stored therein with data for a program to be executed by the processing unit and a second area to be stored therein with information;
• and
• a volatile memory circuit capable of storing the information therein,
• wherein, in response to an initialization operation of the semiconductor integrated circuit device, the information in the second area is read out from the second area and is stored in the volatile memory circuit so that the peripheral circuit is controlled by the information in the volatile memory circuit.