Michael Lindell

Unlock and erase SNEAK32XX2

Discussion created by Michael Lindell on Jun 27, 2019
Latest reply on Jul 2, 2019 by Michael Lindell
I am yet again working with a custom board that has the processor SKEAZN32XXX2. I can connect to it but the JLink-programmer fails to read AP/DP registers when I am trying to execute the unlock Kinetis command (see "unlock kinetis command.png). 
I have tried to power off the board and then turn it on again. I am able to connect to the MCU and do the initial read upon the connect command.  But when I run the erase command I am not able to either halt the processor or erase it (see "erase command.png" for details). Also worth mentioning is that the measured VREF is 3.37V.
I have verified that the issue is not with the JLink-programmer since I have tried and successfully program and erase another custom board of ours with the same MCU.
Therefore, what causes these issues and is there any way around it?
Best regards,
Michael L..