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US 9,792,461 B2Granted
Control apparatus
AssigneeNLT Technologies, Ltd.
InventorKatsuji Isono
Life of this patent
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Abstract
PROBLEM Unauthorized reproduction by a third party is to be prohibited by preventing waveform monitoring on a circuit board and by providing security from the viewpoint of hardware. SOLUTION The present invention disables waveform observation by providing a capacitance detection circuit 3 between devices (i.e., between a programmable device 1 and a nonvolatile device 2) so as to detect input capacitance of the waveform observation apparatus and to halt data signals themselves between the devices (i.e., between the programmable device 1 and nonvolatile device 2).
Claims8
A control apparatus, comprising:
- a capacitance detection circuit disposed in circuitry,
- the circuitry comprising
- a programmable device into which program data is configured to be written from outside to program a function, and
- a nonvolatile device which holds the program data for the programmable device,
- wherein the capacitance detection circuit detects capacitance of a communication line which connects the programmable device to the nonvolatile device.
2 more elements
Dependencies are inferred from the claim text.