UM10462 All information provided in this document is subject to legal disclaimers. © NXP B.V. 2016. All rights reserved.
User manual Rev. 5.5 — 21 December 2016 395 of 523
NXP Semiconductors
UM10462
Chapter 20: LPC11U3x/2x/1x Flash programming firmware
20.9.1 Usage note
When programming flash images via Flash Magic or Serial Wire Debugger (SWD), the
user code valid signature is automatically inserted by the programming utility. When using
USB ISP, the user code valid signature must be either part of the vector table, or the axf or
binary file must be post-processed to insert the checksum.
Table 359. CRP levels for USB boot images
CRP status Volume label Description
No CRP CRP DISABLD The user flash can be read or written.
CRP1 CRP1 ENABLD The user flash content cannot be read but can be updated. The
flash memory sectors are updated depending on the new
firmware image.
CRP2 CRP2 ENABLD The user flash content cannot be read but can be updated. The
entire user flash memory is erased before writing the new
firmware image.
CRP3 CRP3 ENABLD The user flash content cannot be read or updated. The
bootloader always executes the user application if valid.
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