Microcontroller system having security circuitry to selectively lock portions of a program memory address space
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United States of America Patent
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Jan 7, 2003
Grant Date -
N/A
app pub date -
Aug 14, 1998
filing date -
Aug 14, 1998
priority date (Note) -
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status (Latency Note)
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Abstract
A microcontroller system includes a security lock circuit to regulate access requests to contents of locations of a program memory. The regulation is selective, based on an operating mode of the security lock circuit, and also based on the source of the access request and the location of the program memory for which the access request is intended. Among other advantages, one major advantage provided by the security lock circuit is that concurrent programming (i.e., programming of one area of memory using instructions executing from another area of memory) can be initiated under predetermined secure conditions.
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