| 摘要 |
PURPOSE:To surely fetch a data even when no latch signal is transmitted by fetching the data based on a latch data interposed between data. CONSTITUTION:An output circuit 13 is constituted of a microcomputer and inserts a latch data among sent data d0-d3 by transmitting switchingly the sent data d0-d3 and a data with a level '1111' not assigned to the relevant data d0-d3 (called hereinafter latch data) in one clock period. A bus line BS is connected to an AND circuit 15 in an input circuit 11 and when a latch data with a level '1111' is outputted to the bus lines BS, the output signal of the AND circuit 15 rises and the output signal of the relevant AND circuit 15 is used to drive a latch circuit 17. Thus, the relevant output signal is used as a latch signal SR to fetch the succeeding data d0-d3. |
