Microcomputer and method for rewriting data on flash memory
AssigneeNEC Corporation
InventorTakado Kondo
Life of this patent
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Abstract
A microcomputer stores a program in a ROM for rewriting the program stored in a flash memory, and also stores in a nonvolatile memory parameters to be used for the rewriting, as well as version information and lot information of the flash memory. A flash writer selects a corrected program based on the version information, wherein a CPU executes the corrected program while using the parameters stored in the nonvolatile memory to and the parameters selected based on the lot information.
Claims6
A microcomputer unit comprising a flash memory for storing specified data, a ROM storing a program for rewriting the specified data stored in said flash memory, a nonvolatile memory for storing version information and/or lot information of said flash memory, and a CPU for responding to an external command to execute the program for rewriting the specified data in said flash memory based on the version information and/or lot information.
A method for rewriting data stored in a flash memory installed in a microcomputer by using a CPU, the method comprising the steps of:
- storing in the microcomputer a first program for rewriting the data stored in the flash memory;
- storing version information and/or lot information of the flash memory in the microcomputer;
- determining parameters for the rewriting based on the version information and/or lot information;
- and
- running the first program on the CPU to rewrite the data in the flash memory based on the parameters.
Dependencies are inferred from the claim text.