On-chip microprocessor instruction decoder having hardware for selectively bypassing on-chip circuitry used to decipher encrypted instruction codes
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United States of America Patent
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-
Dec 30, 1986
Grant Date -
N/A
app pub date -
Jan 18, 1984
filing date -
Jan 18, 1984
priority date (Note) -
Expired
status (Latency Note)
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Abstract
A microprocessor has on-chip hardware for protecting software against unauthorized use. The microprocessor includes a decoder for deciphering software instruction codes prior to their execution by the microprocessor. The instruction codes are enciphered in a unique way so that they can only be executed by the specific microprocessor for which they are intended.
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