Patent ID: 6598176
Filing Date: 2003-07-22
Classification: G06F

Abstract:
An apparatus for estimating a microcontroller comprising, in one device:a data holding unit for holding arbitrary data rewritably; a processing unit for operating a microcontroller on the basis of a control signal, and processing said arbitrary data; an interface unit for external communication, for receiving signals supplied from an external device, taking out said control signal and sending it to said processing unit; and an internal bus monitoring unit for monitoring the state of an internal bus for connecting mutually said data holding unit, said processing unit and said interface unit for external communication; wherein said processing unit writes the state of said internal bus, at the time when said microcontroller is operated on the basis of said control signal, into said internal bus monitoring unit, and inputs said state written into said internal bus monitoring unit to said data holding unit, or sends it to the external device through said interface unit for external communication.