| 摘要 |
PURPOSE:To realize the flexibility of a degree of a priority by selecting an interruption factor from a group which can be interrupted by the second interruption control mask, in case there is no interruption factor belonging to a group which can be interrupted by the first interruption control mask. CONSTITUTION:The titled system is constituted so than an interruption can be received, if an interruption control mask 11 is '1' even if an interruption control mask 10 is '0', by using the mask 11 and AND gates 20-23, 28-31, and its result is inputted to a priority order determining circuit 40. In this way, even an interruption group which cannot be interrupted by the mask 10 can be interrupted by the mask 11, and also unless an interruption which can be interrupted by the mask 10 is generated, an operation by which an interruption can be recognized is executed through the circuit 40. Also, a number correspond ing to the interruption which is selected by the circuit 40 is sent to an interrup tion address determining circuit 50, and a specified address of a corresponding memory 60 is generated.
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