| 摘要 |
PURPOSE:To suppress the runaway of a microcomputer when abnormality is generated by resetting the microcomputer when no read of an interruption signal is performed as one processing of interruption processings within a prescribed time after inputting the interruption signal. CONSTITUTION:When the interruption signal (NMI signal) 104 is inputted in an abnormal state, a holding means (for example, flip-flop) holds the NMI signal 104, and also, the interruption processing (NMI processing) is started. Simultaneously, a counting means 4 starts counting from a time inputting the NMI signal. When the abnormality is generated in the microcomputer 3 and it reads no holding means within the prescribed time, the counting means 4 outputs a signal to a generating means 4 after counting the prescribed time. As a result, a reset signal generated at the generating means 4 is outputted to the microcomputer 3, then, the microcomputer 3 is reset. In such a way, it is possible to suppress the runaway due to the abnormality in the microcomputer 3. |
