| 摘要 |
A CPU (12) changes the operation mode thereof to a test mode wherein a program being executed will not be stopped even when a CPU exception notification is outputted from an MMU (20), outputs, in the test mode, an access signal to the MMU (20) for making the MMU (20) output a CPU exception notification, and detects whether a CPU exception notification is inputted after the access signal is outputted to the MMU (20). This enables an inspection of whether an abnormality of not being able to detect an unauthorized access is occurring at the memory management unit, even while another program is being executed. |
