FAQ No.:0000003  Issue Date:2015-02-09

Does the NuMicro™ Cortex-M0/M4 Series support the code protected for user's program code? How to unlock the LOCK bit on the User Configuration Word?

Yes, the LOCK bit is provided on the User Configuration Word to protect user's program code. When this LOCK bit is set, all of the data on the Flash memory will be read back as 0xFFFFFFFF. At this time, the "Whole Chip Erase" operation should only be performed for the target chip to unlock the LOCK bit.

Products: M051 Base Series , M0518 Series , Mini51 Base Series , Nano100/102 Base Series , Nano110/112 LCD Series , Nano120 USB Series , Nano130 Advanced Series , NUC029 Series , NUC100/200 Advanced Series , NUC120/122/123/220 USB Series , NUC130/230 CAN Series , NUC131 CAN Series , NUC140/240 Connectivity Series , M451 Base Series , M451M Series , M452 USB Series , M453 CAN Series , NUC442/472 Series , NUC505 Series
Function: Config , Flash Memory Controller (FMC) , Security Lock
Keyword: Code Protection


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