| 摘要 |
In order to make internal states within a digital data processor (10) more readily accessible, upon interruption of the normal operation thereof for monitoring purposes, the digital data processor is provided with variable mode multi-bit shift register storage devices (15) which store such states which are made accessible using controllable gates (G1) to form separately selectable serial strings which permit the states stored in a selected string to be serially shifted to a monitoring unit (20) for monitoring, diagnosing and/or correcting purposes and then returned, via the string, to their original locations in the storage devices. By also using the string connectable variable mode multi-bit shift register devices as input-output registers of one or more micro-code storing RAMS (random access memories M1-Mn) in the data processor, the internal micro-codes may similarly be monitored as well as changed by also using the strings to load the RAMS with new or changed micro-codes. |
