| 摘要 |
PURPOSE:To make discrimination of an interrupt source with a microprogram unnecessary, by using the input selecting signal to a multiplexer, which selects interrupt sources, for generating the address of a control memory area corresponding to the interrupt source. CONSTITUTION:Various interrupt sources are generated from an initializing request circuit 1, a periodical processing request circuit 2, a transmission processing request circuit 3, a receiving processing request circuit 4, a request circuit 5 for a fault processing A, a request circuit 6 for a fault processing B, and a request circuit 7 for a fault processing C and are inputted to a multiplexer 37. The multiplexer 37 selects inputs in accordance with an output signal 39 of a counting circuit 38, and a selected signal is outputted as an interrupt signal 11 to a sequencer of a microprogram when an interruption inhibiting circuit 9 permits interruption. The output signal 39 from the counting circuit 38 is inputted to the sequencer of the microprogram and is used for generating the address of a microprogram corresponding to the interrupt. |
