Method and circuit for analysis of the operation of a microcontroller using signature analysis of memory

摘要

A method and circuit for determining the health of a microcontroller is provided having a circuit that includes a bus, a CPU coupled to the bus and a register coupled to the bus. A memory is also coupled to the bus. The memory is utilized by the first CPU. A controller is coupled to the register for controlling reading of the memory. The register generates a signature in response to the memory. The controller compares the reference signature and the second signature. The controller generated a fault signal when the reference signature is unequal to the second signature.