The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Jun. 14, 1988
Filed:
Mar. 11, 1985
Michael Henn, Stuttgart, DE;
Walter Hersel, Remshalden, DE;
Siegfried Hertzler, Stuttgart, DE;
Rudiger Jautelat, Schwieberdingen, DE;
Werner Jundt, Ludwigsburg, DE;
Gunther Kaiser, Stuttgart, DE;
Michael Kirschner, Pforzheim, DE;
Dieter Mayer, Wangen/A., DE;
Klaus-Gerd Meyer, Oldenburg, DE;
Manfred Mezger, Markgroningen, DE;
Robert Bosch GmbH, Stuttgart, DE;
Abstract
To prevent change of data in a non-volatile programmable, ready-only memory (25) forming, together with a microprocessor (23) a control unit, for example for an automotive vehicle, while permitting programming of the memory from an external programming unit (P, 1), an interface (3, 11, 12) is provided through which a release-enable bus (13) also passes, data being transmitted in accordance with a predetermined characteristic--even or odd parity--, the parity correctness being checked. If the parity is correct, an 'enter' signal is provided on the release-enable bus for storing the data; if not, retransmission is attempted for a predetermined number of time, and if it cannot be correctly effected, a malfunction indication output signal is generated.