| 摘要 |
PURPOSE:To ensure the level control with high efficiency by setting an interruption factor FF in response to the processing level of a microprogram and then releasing the processing level to the same level or a lower level during the program processing. CONSTITUTION:It is supposed that a microprogram under driving is set at level (1) and a channel under control is defined as No.0 respectively. Under such conditions, the microprogram requests an interruption to the channel under control and the level (2) is indicated for the destination of interruption to discontinue the processing. Then an FF 122 is set via an AND circuit 120, and an FF 127 is set via an OR circuit 125. Thus a channel 10 of No. 0 requests an interruption at level (2). As a result, a channel controller 50 can accept the interruption request of a signal line 128. Then the processing unfinished at level (1) is restarted at level (2). In such a way, the interruption can be executed in a short time for the processing of high emergency. This ensures high efficiency for level control. |
