Microprocessor locking circuit and locking method therefor with locking function
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United States of America Patent
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N/A
Issued Date -
May 21, 2009
app pub date -
Feb 26, 2008
filing date -
Nov 21, 2007
priority date (Note) -
Abandoned
status (Latency Note)
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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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