数据交换：这是指实现CPU与控制器之间、控制器与设备之间的数据交换。对于前者，是通过数据总线，由CPU并行地把数据写入控制器，或从控制器中并行地读出数据；对于后者，是设备将数据输入到控制器，或从控制器传送给设备。为此，在控制器中须设置数据寄存器。
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