priority interrupt การใช้

• When running at a specific level, only higher priority interrupts were allowed.
• The priority interrupt system allows 2 38 input / output interrupts and up to 896 system interrupts.
• The "'priority interrupt feature "'added thirty-two interrupt levels to the standard five.
• System software can use the TPR register to temporarily block low-priority interrupts from interrupting a high-priority task.
• This is accomplished by loading TPR with a value corresponding to the highest-priority interrupt that is to be blocked.
• The 980 was, for its time, a relatively powerful small computer that offered memory protection and multiple-priority interrupt capabilities.
• Should a high priority interrupt occur when a portion of the store is complete, the operation must be completed when the interrupt level is returned.
• The interrupts were numbered from 0 ( highest priority ) to 31 ( lowest ); a higher priority interrupt could interrupt processing of a lower priority.
• An ( unusual ) FLIH which unmasks its associated interrupt before it completes is called a priority interrupt system, the FLIH also ( briefly ) masks other interrupts of equal or lesser priority.