| 摘要 |
PURPOSE:To reduce the load or a CPU by outputting an interruption unifying signal, in case the output of a state variation counter is larger than the output of generating device of a threshold level which decreases gradually as a time elapses from an initial state, and initializing the counter and the generating device. CONSTITUTION:When process in formation 1 is received by a DMA5 through a CDT master station 4, etc. and processed between the DMA and a CPU7, an interruption unifying device 14 is constituted of a state variation counter 15, threshold level generating device 16 and a comparator 17, and connected between the DMA5 and a state variation receiving device 13 in the CPU7. In this state, the interrupting signal 18 from the DMA5 is counted by the counter 15, an accumulation state variation number 19 from an initial state is outputted, a threshold level 20 which decreases gradually as a time elapses from the initial state is outputted by the device 16, both the outputs are compared by the comparator 17, and in case when the number 19 is larger or equal, an interruption unifying signal 21 is applied to the device 13, the device 16 is initialized, and the overhead is reduced. |
