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:
Jan. 03, 2006
Filed:
Jul. 15, 2004
Chiaki Kumahara, Kodaira, JP;
Atsushi Shikata, Higashiyamato, JP;
Yasuhiro Nakamura, Tachikawa, JP;
Hideo Kasai, Kokubunji, JP;
Hidefumi Odate, Kodaira, JP;
Chiaki Kumahara, Kodaira, JP;
Atsushi Shikata, Higashiyamato, JP;
Yasuhiro Nakamura, Tachikawa, JP;
Hideo Kasai, Kokubunji, JP;
Hidefumi Odate, Kodaira, JP;
Renesas Technology Corp., Tokyo, JP;
Abstract
A memory card and a microcomputer with nonvolatile memory wherein operation under two different types of power supply specifications is achieved are provided. A MultiMediaCard includes a flash memory and a controller which controls the operation associated with the flash memory. When the controller judges the level of supply voltage supplied from host equipment, it operates as follows: the controller judges whether detecting point corresponding to the voltage level of 1.8V system has been exceeded. After the judgment of excess, the controller judges whether detecting point corresponding to the voltage level of 3.3V system has been exceeded. When the supply voltage is at the voltage level of 1.8V system, the controller causes the flash memory to operate in the 1.8V-system operation mode without driving regulators or level shifters. When the supply voltage is at the voltage level of 3.3V system, the controller drives the regulators and the level shifters to convert the voltage level and causes the flash memory to operate in the 3.3V-system operation mode.