Patent ID: 7482689

Claim:
A microcomputer having a normal mode and a low power consumption mode, the microcomputer comprising: a first chip including a first memory and manufactured with a first manufacturing process that determines a first leak current in the first chip; a second chip including a second memory and manufactured with a second manufacturing process that determines a second leak current in the second chip, the second leak current being greater than the first leak current, wherein at least one of the first and second chips has a power supply circuit for supplying a first voltage to the first chip and a second voltage to the second chip and has first means for interrupting the supply of the second voltage to the second chip in the low power consumption mode, the second chip has second means for transmitting first data stored in the second memory to the first chip during a first transition from the normal mode to the low power consumption mode, and the first chip has third means for writing the first data to the first memory.