| 摘要 |
PURPOSE:To enable even another peripheral input/output element having the priority set at a lower level to receive the support, by accepting the task switching interruption requested by a multi.task control element having the priority of a higher level by a master CPU and requesting a normal interruption to the master CPU. CONSTITUTION:Multi.task control elements 11-1m of a multi.task control element group 1 serve as independent function elements which perform plural task controls to be executed by a master CPU2 by means of elements except the CPU2 and requests an interruption to the CPU2 at a time point when the task switching is needed. Each of the elements 11-1m has the priority, and the elements 11 and 1m have priorities of the highest and lowest levels respectively. If an applicable task exists among those tasks within a control range of upper control elements, the upper elements inhibit the interruption effective for task switching of lower elements. When no applicable task exists no more, the tasks within a control range of lower control elements are applicable.
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