| 摘要 |
PURPOSE:To simplify a control program concerning an interruption processing and to decrease the number of a program step by processing the interruption request accumulated already when a control instruction to execute the interruption processing is decoded and preventing the interruption processing when the instruction except the control instruction is decoded. CONSTITUTION:When an interruption request is executed and a control instruction to execute an interruption processing is executed, first, the output value of a program counter 2 is stored into a stack 3, an interruption processing address signal from an interruption request holding circuit 1 is sent to a program counter 2 and the execution is shifted to the interruption processing program. From a decoder 5 to the interruption request holding circuit 1, a resetting signal is sent, and the interruption request is released. When the interruption processing is completed, the data of the stack 3 are sent to the program counter 2 and a usual instruction action is shifted. Even when the interruption request continuously occurs and the control instruction to execute the interruption processing is not executed, the interruption processing is not executed. |
