Single-chip microcomputer with encryptable function on program memory
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United States of America Patent
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-
Aug 16, 1988
Grant Date -
N/A
app pub date -
Aug 31, 1984
filing date -
Oct 14, 1983
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
A single-chip microcomputer with an encryptable function on program memory encrypts the contents of the memory for protection of secrecy when the programs stored in read only memory (ROM) are read to the outside. An encrypting code generator is provided to execute the encrypting and the encrypting code is stored in an instruction decoder, which decodes the encrypting code and sends it to the arithmetic and logic unit (ALU). The ALU encrypts the data from the ROM based on the encrypting code from the decoder, and outputs the result to the outside on an input/output port.
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