| 摘要 |
PURPOSE:To minimize the increment of hardware to realize the display of the operating status of a subprocessor or each I/O port in a decentralized processor, by using the means of a microprogram. CONSTITUTION:A system controlling processor reads out a microinstruction from an address of a microprogram storing memory 1 specified by a microinstruction address stored in a microinstruction address register 2. The read microinstruction is decoded by a microinstruction execution controlling part 5 including a microinstruction command decoder 4 to control the execution of the microinstruction. An interruption priority discrimination controlling circuit 6 discriminates the interruption priority at the occurrence of the interruption and generates a commands for switching a hardware source corresponding to the interruption accompanying the switching of a farmware execution level. |
