Title:
NONVOLATILE MEMORY ACCESS CONTROL SYSTEM
Document Type and Number:
Japanese Patent JP2004287541
Kind Code:
A
Abstract:
To provide a nonvolatile memory access control system which allows a system originator to freely write information requiring prevention of falsification, while ensuring that falsification of this information is prevented.
A CPU sets a non-rewritable area on a nonvolatile memory 6 according to a system initialization program stored in a boot ROM, and an access control circuit controls rewriting to either permit or inhibit it according to a write flag F set on the non-rewritable area.
Inventors:
Nagata, Taichi
Nemoto, Yusuke
Nemoto, Yusuke
Application Number:
JP2003000075714
Publication Date:
October 14, 2004
Filing Date:
March 19, 2003
Export Citation:
Assignee:
MATSUSHITA ELECTRIC IND CO LTD
International Classes:
G06F12/14; (IPC1-7): G06F12/14
Previous Patent: METHOD AND DEVICE FOR GROUPING FACILITY
Next Patent: ELECTRONIC COMMERCIAL TRANSACTION SERVICE SYSTEM
Next Patent: ELECTRONIC COMMERCIAL TRANSACTION SERVICE SYSTEM