| 摘要 |
PURPOSE:To improve a trouble detection rate in case of possibility of retrying and to reduce the trouble detection rate in case of impossibility of retrying by rewriting a register independent of the operation of the other microprograms in case of possibility of the retrying but holding this register in case of impossibility of the retrying. CONSTITUTION:Unless data from a microprogram 2 is 11, a register C is independent of impossibility or possibility of the retrying. When data 11 is sent from the program 2, the register C is held in case of impossibility of the retrying, and the register C is rewritten with OR between registers A and B and contents of the register A alternately in case of possibility of the retrying. Consequently, the register C has contents rewritten to detect trouble in case of possibility of the retrying but holds contents not to detect trouble in case of impossibility of retry though the register C is essentially independent of the operation of the program 2. Thus, the trouble detection rate is improved in case of possibility of the retrying but is reduced in case of impossibility of the retrying. |
