| 摘要 |
PURPOSE:To prevent a procedure from entering a waste loop of re-calculation by counting the number of times of re-counting automatically when the result of operation is in error and interrupting the re-counting when it is executed continuously for a certain number of times or over. CONSTITUTION:A CPU2 receives a control signal 116 from a comparator circuit 11 to start an arithmetic operation, the result 117 of arithmetic is outputted to a sequential comparison discriminating circuit 14, where the propriety there of is discriminated. When an error is found out as the result of discrimination, a control signal 113 is outputted to an oscillation control circuit 15 to stop an oscillation circuit 16 forcibly, the supply of an operation block is stopped to stop the arithmetic. On the other hand, a signal 113' is outputted synchronously with the signal 113 to a timer circuit 17, after a prescribed time is counted, the oscillation control circuit 15 is driven. When the oscillation is started again, the arithmetic program of the arithmetic CPU2 is restored to the initial state, the arithmetic data inputted again before is read from a temporary storage RAM5 to start calculation. |
