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:
May. 30, 2000
Filed:
May. 04, 1999
Applicant:
Inventor:
Masato Koura, Tokyo, JP;
Assignee:
Mitsubishi Denki Kabushiki Kaisha, Tokyo, JP;
Attorney:
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
G11C / ;
U.S. Cl.
CPC ...
365226 ; 365229 ;
Abstract
A voltage drop circuit for generating an active voltage to be supplied to a ROM by dropping a supply voltage. The voltage drop circuit inhibits an access of a CPU to the ROM for a predetermined time period immediately after the ROM shifts from a standby mode to an active mode. This makes it possible to solve a problem of a conventional voltage drop circuit in that it is not unlikely that the CPU cannot read data correctly from the ROM for a moment immediately after the ROM shifts from the standby mode to the active mode because of fluctuations of the active voltage in that moment.