Microcontroller system having allocation circuitry to selectively allocate and/or hide portions of a program memory address space
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United States of America Patent
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Jan 15, 2002
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N/A
app pub date -
Aug 14, 1998
filing date -
Aug 14, 1998
priority date (Note) -
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Abstract
A microcontroller system has a first and a second block of non-volatile programmable memory and includes a program memory space allocation circuitry. In a first mode of operation, the first and second blocks of programmable memory are prevented from being written by commands external to the microcontroller system. In a second mode, however, the first and second blocks of programmable memory are prevented from being written by commands external to the microcontroller system but the second block of programmable memory can be written based upon execution of commands stored in the first block of programmable memory. By having circuitry to so allocate the programmable memories, the security of the programmable memories is enhanced.
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