Verfahren zum Verhindern einer unberechtigten Datenänderung bei einer Vorrichtung mit einem nichtflüchtigen Speicher

摘要

In the case of an apparatus having a central processor (CPU), a program memory (ROM) and a non-volatile memory (NVM), data in the non-volatile memory (NVM) can only be modified if a check bit has been set in a control (monitoring) register (KR) prior to checking the data modification authorisation. To this end, the instruction for setting the check bit must be in a defined address range of the data modification program and is checked with regard to this by the control register (KR).