MICROCOMPUTER AND MICROCOMPUTER SYSTEM

摘要

A microcomputer includes a plurality of functional blocks that exchange information with each other. A nonvolatile memory can rewrite information stored therein and first data has been written therein in advance. A central processing unit processes information read from the nonvolatile memory or writes information to the nonvolatile memory. An abnormality detecting unit detects an abnormality in exchange of data between the plurality of functional blocks. A nonvolatile memory checking unit reads the first data from the nonvolatile memory when the abnormality detecting unit has detected an abnormality, compares the first data with second data indicating the content of the first data when written to the nonvolatile memory, and detects an abnormality in the nonvolatile memory when a result of the comparison shows that the first data is not identical to the second data.

主权项

1. A microcomputer having a plurality of functional blocks that exchange information with each other, the microcomputer comprising:
a nonvolatile memory which can rewrite information stored therein and in which first data has been written in advance; a central processing unit that processes information read from the nonvolatile memory or writes information to the nonvolatile memory; an abnormality detecting unit that detects an abnormality in exchange of data between the plurality of functional blocks; and a nonvolatile memory checking unit that reads the first data from the nonvolatile memory when the abnormality detecting unit has detected an abnormality, compares the first data with second data indicating the content of the first data when written to the nonvolatile memory, and detects an abnormality in the nonvolatile memory when a result of the comparison shows that the first data is not identical to the second data.