ERRONEOUS WRITING PREVENTIVE METHOD OF NONVOLATILE MEMORY

摘要

PROBLEM TO BE SOLVED: To provide a method of preventing an erroneous writing of data due to such as runaway of software in a copier system. SOLUTION: The copier system has a data bus width of a nonvolatile memory smaller than a data bus width of the copier system, and prevents the erroneous writing of the data without executing writing as long as a bit does not coincide with a preset authenticating code by setting the bit of a data bus unconnected with the nonvolatile memory as a bit for the writing authenticating code. COPYRIGHT: (C)2004,JPO