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:
Oct. 06, 1987
Filed:
Dec. 27, 1984
Applicant:
Inventors:
Brian F Wilkie, Austin, TX (US);
Michael Gallup, Austin, TX (US);
John Suchyta, Austin, TX (US);
Kuppuswamy Raghunathan, Austin, TX (US);
Assignee:
Motorola, Inc., Schaumburg, IL (US);
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
G06F / ;
U.S. Cl.
CPC ...
364200 ; 365218 ; 365185 ;
Abstract
An integrated circuit microcomputer with EEPROM has a limited number of modes for operation. In at least first and second modes, the inner workings of the microcomputer, including the contents of the EEPROM, can be read externally from the microcomputer. An EEPROM security bit, when set, prevents the first mode from being entered and causes the EEPROM to be erased when the second mode is entered. The EEPROM is also erased if the security bit is erased.