| 摘要 |
PURPOSE:To perform the interruption processing at a high speed and at the same time to simplify a program by switching the working state to a 2nd register group from a 1st register group when an interruption request is delivered and resetting the initial state when the interruption is through. CONSTITUTION:Both register groups 4a and 4b are provided and connected in parallel with each other between a serial/parallel converter 3 and a parallel bus line 5. When an interruption signal 8 is supplied to a control part 6 from a line 5, a microprocessor unit 1 delivers a register group switching signal 10 to the part 6 to inform a fact that the interruption processing is carried out for the interruption request. The part 6 receives the signal 10 and switches the working state to the group 4b from the group 4a. However the part 6 inhibits said switching action in case all necessary data are stored in the group 4a and data are transmitted to the line 5 and then performs the switching action when the transfer of data is through. The working state is set back to the group 4a when the interruption processing is through. |
