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:
Mar. 06, 2007
Filed:
Sep. 22, 2004
James M. Sibigtroth, Round Rock, TX (US);
George L. Espinor, Austin, TX (US);
Bruce L. Morton, Lakeway, TX (US);
Michael C. Wood, Pflugerville, TX (US);
James M. Sibigtroth, Round Rock, TX (US);
George L. Espinor, Austin, TX (US);
Bruce L. Morton, Lakeway, TX (US);
Michael C. Wood, Pflugerville, TX (US);
Freescale Semiconductor, Inc., Austin, TX (US);
Abstract
A data processing system () has an embedded non-volatile memory () that is programmed and erased by use of a high voltage provided by a charge pump (). In order to prevent the non-volatile memory () from being inadvertently programmed or erased during low power supply voltage conditions, the charge pump () is disabled and discharged when the power supply voltage drops below a predetermined value. This is accomplished by enabling a low voltage detect circuit () in response to a program or erase operation being initiated. A control register () will provide a high voltage enable signal to the charge pump () only when a power supply valid signal is received. In another embodiment, the low voltage detect circuit () may be enabled by another condition to protect the data processing system () from an authorized access.