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Flash is secured after writing

Question asked by liuweiwei on Mar 17, 2017
Latest reply on Mar 17, 2017 by lama

Dear sir,


I am using ms9c12xdp512 16 bit mcu. After i writing to flash, the BDM prompt an dialog "Communications with target failed: The target MCU has no clock or wrong BDM clock speed is used to derivateve is secured" and can not debug the project. I must "unsecure" the flash, then i can use BDM to debug. I am sure my hardware and BDM are good. Which software issue can make this happen?