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Description The HCS12 Family of devices contain a security mechanism preventing access to the contents of the internal Flash and EEPROM via the BDM or expanded operating modes. The security mechanism, controlled by the two least significant bits of the security byte located at $FF0F, is automatically programmed to the unsecured state ($FE) after invoking FLoads19. This allows for additional testing to be performed on the target system after the programming operation has been completed. The Secure method is used to program the security byte with a value of $FD, placing the target device in a secured state. If the security byte already has a value of $FE (which it should), the value of the security byte would become $FC. Using the value of $FD prevents bit zero of the security byte from being programmed a second time if it already contains a value of zero. Syntax HCS121.Secure Parameters are no required. See also: |
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