| 摘要 |
PURPOSE:To execute a control of a processor by executing an access to a control register from the outside by using a control use data bus even if a general data bus causes a fault, by providing the control use data bus separately from a usual general data bus. CONSTITUTION:A control use data bus 3 is used for writing data to a control register 1 or N from the outside, or sending out data which has been read out of the control register 1 or N, to the outside. Even if some fault is generated in a general data bus 2 and its use becomes impossible, an access is executed to the control register 1 or N from the outside through a control use data bus provided independently. In such a way, the processor 1 can be controlled. |
