| 摘要 |
PURPOSE:To very easily take synchronization of a bus cycle and execution of a micro-instruction by simple constitution, by determining supply of the micro-instruction, based on the contents of the micro-instruction and a state of the bus cycle between a device and an external memory. CONSTITUTION:Based on the contents of a micro-instruction and a state of a bus cycle between a device and an external memory, an instruction for making the micro-instruction ineffective, in the course of the bus cycle is selected and supplied to a micro-instruction decoder 4. Also, unless in the course of the bus cycle, a micro-instruction which is held in a micro-instruction register 3 is supplied to the micro-instruction decoder 4. In such a way, synchronization of the bus cycle to the external memory and the micro-instruction can be taken easily.
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