| 摘要 |
PURPOSE:To prevent incorrect renewal of an important resource due to malfunction of a microprogram, by constituting that a specific decoder is not operated until a key word is designated in the microinstruction in advance. CONSTITUTION:In revising a resource, a key word corresponding to the resource is decided in advance, and the key word is set to a specified location of the microinstruction of the 1st stage step. The detection of the key word is made with an effectiveness discrimination circuit 4 and when the key word is detected, the operation of a specific decoder 3 is permitted at the next step. If no key word is detected, the specific decoder 3 is inoperative. Thus, the destruction of the important resource due to unprepared microinstruction can be prevented. |
