POWER CUT-OFF DETECTING DEVICE IN EQUIPMENT WITH SECURITY MECHANISM

POWER CUT-OFF DETECTING DEVICE IN EQUIPMENT WITH SECURITY MECHANISM

PURPOSE: To provide a power cut-off detecting device surely capable of detecting the generation of a power cut-off state in equipment with a security mechanism. CONSTITUTION: When power supply to-equipment is cut-off, a flip-flop circuit 8 is reset. Where the flip-flop circuit 8 is reset at the time...

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Bibliographische Detailangaben
1. Verfasser: TATEISHI NOBUYOSHI
Format: Patent
Sprache:eng
Schlagworte:
CALCULATING
COMPUTING
COUNTING
ELECTRIC DIGITAL DATA PROCESSING
PERFORMING OPERATIONS
PHYSICS
TRANSPORTING
VEHICLES IN GENERAL
VEHICLES, VEHICLE FITTINGS, OR VEHICLE PARTS, NOT OTHERWISEPROVIDED FOR
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Beschreibung
Zusammenfassung:PURPOSE: To provide a power cut-off detecting device surely capable of detecting the generation of a power cut-off state in equipment with a security mechanism. CONSTITUTION: When power supply to-equipment is cut-off, a flip-flop circuit 8 is reset. Where the flip-flop circuit 8 is reset at the time of reset starting, judging that power supply was cut-off, a micro computer 2 executes a security process. After that, the computer 2 stores the result of the execution of the security process in an EEPROM 3 and then sets the flip-flop circuit 8. The security performance of the equipment is further improved by replacing the flip-flop circuit 8 with a shift resister or RAM comprising a plurality of bits.