| 摘要 |
PURPOSE:To facilitate the change of a microprogram and to define freely the microprogram by storing and executing, from an external memory, the microprogram to the control memory constituted of the rewritable memory. CONSTITUTION:The microprogram prepared by a user is stored to an external memory 101 once and, by a control memory rewriting means 115, written into a rewritable memory part 111a of a control memory 111. The rewritable memory part 111a is accessed by a control memory address 109 stored in a control memory address register 110 as well as a reading exclusive-use memory part 111b. As the result, the read micro-instruction is stored into a micro-instruction register 112 and decoded an executed at a micro-instruction decoder 113.
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