topic Re: Undesired FLASH protection on MC9S08QB4 in 8-bit Microcontrollers https://community.nxp.com/t5/8-bit-Microcontrollers/Undesired-FLASH-protection-on-MC9S08QB4/m-p/283561#M20319 <HTML><HEAD></HEAD><BODY><P>I found the problem. I erased the NVOPT bits due to a page erase and did not set the SEC00 bit back to 0. Ref.Manual p.55.</P><P></P><P>Thank you anyway.</P><P>Ben</P></BODY></HTML> Thu, 29 Aug 2013 21:13:31 GMT benthie 2013-08-29T21:13:31Z Undesired FLASH protection on MC9S08QB4 https://community.nxp.com/t5/8-bit-Microcontrollers/Undesired-FLASH-protection-on-MC9S08QB4/m-p/283560#M20318 <HTML><HEAD></HEAD><BODY><P>Hey everybody,</P><P style="min-height: 8pt; padding: 0px;">&nbsp;</P><P>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).</P><P style="min-height: 8pt; padding: 0px;">&nbsp;</P><P>If I stop my program and debug it again, then the "device is secured"-dialog pops up.</P><P style="min-height: 8pt; padding: 0px;">&nbsp;</P><P>Does anybody has an idea, at which point the securing happens?</P><P style="min-height: 8pt; padding: 0px;">&nbsp;</P><P>Regards,</P><P>Ben</P></BODY></HTML> Thu, 29 Aug 2013 20:46:56 GMT https://community.nxp.com/t5/8-bit-Microcontrollers/Undesired-FLASH-protection-on-MC9S08QB4/m-p/283560#M20318 benthie 2013-08-29T20:46:56Z Re: Undesired FLASH protection on MC9S08QB4 https://community.nxp.com/t5/8-bit-Microcontrollers/Undesired-FLASH-protection-on-MC9S08QB4/m-p/283561#M20319 <HTML><HEAD></HEAD><BODY><P>I found the problem. I erased the NVOPT bits due to a page erase and did not set the SEC00 bit back to 0. Ref.Manual p.55.</P><P></P><P>Thank you anyway.</P><P>Ben</P></BODY></HTML> Thu, 29 Aug 2013 21:13:31 GMT https://community.nxp.com/t5/8-bit-Microcontrollers/Undesired-FLASH-protection-on-MC9S08QB4/m-p/283561#M20319 benthie 2013-08-29T21:13:31Z