| 摘要 |
PURPOSE:To produce a pseudo fault at an optional time point by setting the pseudo fault production timing to a timer and outputting a signal of a level in accordance with discrimination between a fixed fault and an intermittent fault from a valid signal holding circuit. CONSTITUTION:The type of a pseudo fault, the pseudo fault production timing, and the discrimination between the fixed and intermittent faults are set to an external device. This setting information is sent to a data processor and stored in a reception register 7 and an interruption is applied to a microprocessor 1. The microprocessor 1 sets the production timing of the pseudo fault to a timer 5 to start it and at the same time sets the value in accordance with the type of the pseudo fault to a pseudo fault register circuit 4. In addition, an FF 111 of a valid signal holding circuit 11 is set and reset in accordance with discrimination between the fixed and intermittent faults. When the timer 5 has a time-up state, a valid signal (a) is sent to the circuit 4 from a valid signal generating circuit 6 and a pseudo fault generating part 42 produces a pseudo fault in accordance with the value set at a register 41. Thus it is possible to produce the fixed and intermittent pseudo faults at each optional time point. |
