Electrical computers and digital processing systems: support – Digital data processing system initialization or configuration – Loading initialization program
Reexamination Certificate
2004-07-29
2008-11-04
Du, Thuan N (Department: 2116)
Electrical computers and digital processing systems: support
Digital data processing system initialization or configuration
Loading initialization program
C713S001000, C711S153000
Reexamination Certificate
active
07447894
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.
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Intel Low Pin Count (LPC) Interface Specification, Aug. 2002, Revision 1.1, pp. 1-54.
Kishi Hiroshi
Oshiba Masashi
Sato Yoshiaki
Yamakawa Kentaro
Yamaki Yoko
Du Thuan N
Miles & Stockbridge P.C.
Renesas Northern Japan Semiconductor, Inc.
Renesas Technology Corp.
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