| 摘要 |
PURPOSE:To solve easily the trouble due to an interruption abnormality by judging that the interruption processing is abnormal when the active condition time of the counted interruption request signal is longer than the prescribed time. CONSTITUTION:When an interrupting signal S is supplied from the external part to an interrupting processing control part 13, an interruption request signal RS is outputted to a microprocessor 11 and counted by a counter 21. When a counted value (n) set beforehand is counted, a counter output signal OS is outputted, a gate 23 is closed and the counting of the counter 21 is stopped. After that, when an initial resetting signal LS is inputted, a counter resetting signal CLS clears the counter 21 through a gate 24. When an active condition time T of the signal RS is longer than the counted value (n), namely, when the interruption request is not accepted and an interruption acknowledging signal AS is not outputted from the processor 11, or when the signal RS continues to be outputted more than necessary, the signal OS is outputted. Consequently, it can be judged that abnormalities occur at the interruption processing function.
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