Microcomputer system, microcomputer, power control method, and power control program product

摘要

A microcomputer system according to the present invention includes multiple backup power supplies that are used instead of the main power supply in response to a voltage drop of a main power supply. The microcomputer system further includes a backup power supply monitoring circuit that monitors charge amount of the multiple backup power supplies and determines whether the charge amount is lower than a predetermined charge amount, a backup power supply charging circuit that charges the backup power supply from the main power supply, where the backup power supply is determined by the backup power supply monitoring unit that the charge amount thereof is lower than the predetermined charge amount, and a power supply switching unit that switches to the backup power supply selected according to a predetermined rule if a voltage of the main power supply is reduced.