Method for enciphering and deciphering instructions in a microcomputer, and a microcomputer used for effecting same
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United States of America Patent
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Feb 27, 1990
Issued Date -
N/A
app pub date -
Apr 17, 1989
filing date -
Dec 29, 1981
priority date (Note) -
Expired
status (Latency Note)
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Abstract
A method for enciphering and deciphering instructions in a microcomputer and a microcomputer for effecting the same, in which, an instruction is coded into at least two types of instruction codes and stored in a storage unit and in which, under the control of discriminating circuit for discriminating the coded format, each instruction code is decoded by one of at least two decoders in accordance with one of at least two decoding formats, so that the stored software is prevented from being learned by third persons.
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