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Undesired FLASH protection on MC9S08QB4

Question asked by Ben Thie on Aug 29, 2013
Latest reply on Aug 29, 2013 by Ben Thie

Hey everybody,


my current application uses the flash programming routines from AN3942. At some point my program writes data to the flash (0xFFC0 - 0xFFFF). Everything works fine so far, the data is where I want it to be and when I debug the controller, the FOPT register tells me, that the flash is unsecured (FOPT = 0xC2).


If I stop my program and debug it again, then the "device is secured"-dialog pops up.


Does anybody has an idea, at which point the securing happens?