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4.1 引言当用户得到一部功能完整的微型计算机后,为了用它完成任何一项有价值的工作,都必须和外部设备进行交往。输入——输出口(简称I/O口)提供了MPU与外设之间所必须的数据通讯线路。典型的情况是:从输入口收集外设的信息,传送给MPU进行处理。然后将处理的结果通过输出口传送到一个或多个外设,用以显示信息数据或对各种设备进行控制。在微型计算机系统里,输入——输出技术是很重要的。这是由于大多
4.1 Introduction When users get a full-featured microcomputer, they have to deal with external devices in order to do anything of value to them. Input - output port (referred to as I / O port) provides the MPU and peripherals necessary data communication lines. The typical situation is: Collect peripheral information from the input port, sent to the MPU for processing. The result of the processing is then passed through the output port to one or more peripherals for display of informational data or control of various devices. In micro-computer systems, input-output technology is very important. This is due to most