BURGLARY PREVENTING DEVICE FOR ELECTRONIC EQUIPMENT AND SEMICONDUCTOR INTEGRATED CIRCUIT INCORPORATING BURGLARY PREVENTING FUNCTION

摘要

PURPOSE:To execute the double check of a factory code and a personal code when an interruption of power supply is detected in a backup state of the power supply by writing in a factory code to a ROM, and storing a personal code in a RAM. CONSTITUTION:When the interruption of power supply 10 is detected by a flip-flop 4 when the backup of the power supply by a backup condenser 13 is in a working state, a comparing means 8 compares the factory code stored in a ROM 6 and a code inputted by key, and further, compress the personal code preliminarily stored in a RAM 7 with the key inputted password code, and puts the electronic machine in an operating state only when both are matched. On the other hand, even when the backup of the power supply is in a ceased state, when the power supply 10 is charged, the factory code stored in the ROM 6 is compared to the key inputted code, and the electronic equipment is put in the operating state when they are matched, so the burglary prevention function works. Thus, a double burglary prevention is executed.