Microprocessor locking circuit and locking method therefor with locking function
First Claim
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1. A microprocessor locking circuit for use in a microprocessor comprising at least one program code, comprising:
- a predetermined key, wherein the microprocessor locking circuit receives an input key and compares the input key with the predetermined key after a reset period starts, wherein the program code is unlocked if the input key is identical to the predetermined key, and the program code is locked if the input key is different from the predetermined key.
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Abstract
A microprocessor locking circuit for use in a microprocessor comprising at least one program code is provided. The microprocessor locking circuit includes a predetermined key, wherein the microprocessor locking circuit receives an input key and compares the input key with the predetermined key after a reset period starts, wherein the program code is unlocked if the input key is identical to the predetermined key, and the program code is locked if the input key is different from the predetermined key.
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Citations
30 Claims
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1. A microprocessor locking circuit for use in a microprocessor comprising at least one program code, comprising:
a predetermined key, wherein the microprocessor locking circuit receives an input key and compares the input key with the predetermined key after a reset period starts, wherein the program code is unlocked if the input key is identical to the predetermined key, and the program code is locked if the input key is different from the predetermined key. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15)
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16. A locking method for a microprocessor locking circuit for use in a microprocessor, the microprocessor comprising at least one program code and the microprocessor locking circuit comprising a predetermined key, comprising steps of:
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receiving an input key after a reset period starts; comparing the predetermined key with the input key; unlocking the program code if the input key is identical to the predetermined key; and locking the program code if the input key is different from the predetermined key. - View Dependent Claims (17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28, 29, 30)
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Specification