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Code Read Protection is a mechanism that allows users to enable different levels of
security in the system so they can protect both their software code and hardware.
LPC1100/LPC1300 devices have three different active security levels： CRP1， CRP2， and
CRP3. Each mode increases the security level， with CRP3 restricting any access to the
device. These devices also feature a new protection level “NO_ISP” which will suppress
response to the ISP pin at system startup （but will not prevent debug via SWD， nor will it
prevent read access to flash memory）。 In this application note we examine all these
security levels and how to use them according to various security requirements. We also
provide an example to test all of these modes. This application note will make use of the
LPCXpresso1114 or LPCXpresso1343 Evaluation boards and the LPCXpresso
Baseboard. The software will be developed using the LPCXpresso IDE.
CAUTION： Although the example used in this application note was carefully tested，
it is recommended that the user initially configure the device to a level lower than
CRP3. Once the code is successfully tested， CRP3 can be used with confidence.
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