| 摘要 |
PURPOSE:To prevent the runaway of an emulator CPU by forcibly initializing the emulator CPU when power source abnormality occurs in a target during the execution interruption of a program. CONSTITUTION:When a signal indicating power source abnormality as a power source voltage signal 101 inputted from a power source terminal 51 during the execution interruption of the program, the power source abnormality signal 103 is outputted from a power source abnormality detecting circuit 1 so as to be inputted to a control part 3 and an initializing circuit 2. The initializing circuit 2 supplies a CPU initializing signal 107 to the emulator CPU 4 at the time of the input of the power source abnormality signal 103 as far as an execution interruption state signal 106 is inputted from the control part 3. Therefore, when it is expected that the power source in the target is an abnormal state by the power source voltage signal 101 inputted from the power source terminal 51, the emulator CPU 4 is forcibly initialized with the power source abnormality signal 103 outputted from the power source abnormality detecting circuit 1 and the initializing circuit 2. |
