1. A circuit arrangement for secure data processing for program data with a protected data record, comprising: an internal memory which provides a protected data record having instruction words and at least one first check word associated with the instruction words; an arithmetic and logic unit having an input coupled to the internal memory and which outputs the at least one first check word from the applied protected data record; a checking apparatus having an input coupled between the internal memory and the arithmetic and logic unit and which allocates at least one second check word to the instruction words in the protected data record; and a comparison apparatus having respective inputs coupled to the checking apparatus and the arithmetic and logic unit and which compares the at least one first check word with the at least one second check word and outputs an alarm signal when the at least one first check word does not match the at least one second check word.
1. A circuit arrangement for secure data processing for program data with a protected data record, comprising: an internal memory which provides a protected data record having instruction words and at least one first check word associated with the instruction words; an arithmetic and logic unit having an input coupled to the internal memory and which outputs the at least one first check word from the applied protected data record; a checking apparatus having an input coupled between the internal memory and the arithmetic and logic unit and which allocates at least one second check word to the instruction words in the protected data record; and a comparison apparatus having respective inputs coupled to the checking apparatus and the arithmetic and logic unit and which compares the at least one first check word with the at least one second check word and outputs an alarm signal when the at least one first check word does not match the at least one second check word. 4. The circuit anangement of claim 1 , wherein the arithmetic and logic unit processes program data which comprise at least one protected data record.