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只用几个逻辑门和几条指令就可以给一个自动换挡的数字电压表(DVM)和一台微处理器之间的接口提供所需要的硬件和软件。这个线路能使一台8位微
Using only a few logic gates and a few instructions, you can provide the hardware and software you need for the interface between a digital voltmeter (DVM) that automatically shifts and a microprocessor. This line can make a 8-bit micro