Method and device for protecting data of ROM
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United States of America Patent
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-
May 17, 1994
Issued Date -
N/A
app pub date -
Jan 29, 1993
filing date -
Mar 9, 1990
priority date (Note) -
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status (Latency Note)
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Abstract
A method and a device are provided for protecting data stored in a ROM of a micoprogram control unit. Such data may take the form of a user program. To protect the data, predetermined code data is written into a predetermined address in the ROM. A code address inputted from outside the microprogram control unit is then compared with the predetermined address. If the inputted code address is determined to match the predetermined address, then code data inputted from outside the microprogram control unit is compared with the predetermined code data. Only after both of these comparisons are successfully made is the data in the ROM allowed to be read outside the microprogram control unit.
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