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:
Nov. 04, 2008
Filed:
Jul. 29, 2004
Masashi Oshiba, Tachikawa, JP;
Yoshiaki Sato, Kodaira, JP;
Kentaro Yamakawa, Kodaira, JP;
Yoko Yamaki, Kodaira, JP;
Hiroshi Kishi, Akishima, JP;
Masashi Oshiba, Tachikawa, JP;
Yoshiaki Sato, Kodaira, JP;
Kentaro Yamakawa, Kodaira, JP;
Yoko Yamaki, Kodaira, JP;
Hiroshi Kishi, Akishima, JP;
Renesas Technology Corp., Tokyo, JP;
Renesas Northern Japan Semiconductor, Inc., Chitose-Shi, Hokkaido, JP;
Abstract
A microcomputer capable of reducing a board area, enhancing the security, and improving the usability is provided. A microcomputer to be used in a notebook PC is disclosed, in which programs of a keyboard/power management BIOS and a system BIOS are stored in a built-in flash memory ROM. In order to set read (R)/write (W) protect to the BIOSes stored in the flash memory ROM, a read/write protect setting register is provided, and at initial setting after the release of reset, flags of R/W permission, R permission/W prohibition, W permission/R prohibition, and R/W prohibition are set to this register by a central processing unit CPU. By doing so, it becomes possible to achieve protection such as the prevention of error writing of the BIOS and the like between a host machine and the flash memory ROM via a LPC bus.