| 摘要 |
PURPOSE:To reduce the quantity of a microprogram of a communication control circuit and the hardware by providing a means adding count information representing the order of generation of the notice of end to an end notice. CONSTITUTION:An ending counter comprising a device such as a microprogram register, a memory or a hardware counter is built in a control section of a communication control circuit 3 and indicates the order of ending of commands. When the end of command is notice to a data processing section 1 via an interruption line 104 from the control circuit 3, the processing section 1 searches a word of a report block of the memory 2 and discriminates which command is to be finished. Furthermore, when >=2 commands are finished, the order of end of commands is discriminated by comparing next words. Thus, the command end processing is applied in the correct order and further, the processing section 1 searches periodically the word of the report block of the memory so as to attain similar effect even without the interruption line 104.
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