Device for improving the detection of non-operational states in a non-attended interrupt-driven processor.

摘要

Device for detecting the unoperational states of an interrupt driven processor executing instructions on n priority levels, n-1 being the lowest priority level and 0 the highest priority level. It comprises means (18) for dispatching an unoperational state detection task running on the n-1 priority level at time intervals smallerthan a specified time-out delay. A detection timer (1) which is set at an initial value each time the task is dispatched and the content of which is changed stepwise once the task has been dispatched and an interval timer (13) having a minimum step value. Means (20) are responsive to the final value taken by the detection timer when the time-out delay has elapsed, to send a level 0 interrupt to the processor. A REMEMBER LATCH (26) is set at the occurrence of the first next pulse from the interval timer if the detection timer is at its final value and which are reset when the level 0 interrupt handling succeeds in restoring the cause of said level 0 interrupt request.