| 摘要 |
PURPOSE:To share an interruption request signal with plural input/output controllers and to easily expand a system, by converting the interruption request signal consisting of a level signal to the interruption request signal of an edge signal, and transferring it to an interruption control circuit. CONSTITUTION:An interruption generating device (IOC)10a generates the interruption request signal with an LOW significant level signal, and simultaneously, a similar interruption request signal is generated from an IOC10n. The interruption request signal 11 becomes the OR of the interruption request signals from the IOC10a and IOC10n, and the interruption request signal 11 becomes the interruption request signal 13 in which the level signal is converted to the edge signal by passing a conversion circuit 12, and leading edges are generated at two places. The interruption request signal to a microprocessor 5, therefore, holds an H level until total three of interruption request signals are completed. |
