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【单选题】
请判断ADC0809芯片的工作过程：(1)STart信号启动A/D转换8路模拟开关输入的模拟量(2)A、B、C选择输入通道地址，并由ALE发锁存信号(3)OE信号开三态门，输出转换的数字信号(4)A/D转换完毕，发转换完毕信号(EOC)，可以作为中断信号 A、(2)(1)(4)(3) B、(2)(1)(3)(4)
C.
(1)(2)(4)(3)
D.
(4)(3)(1)(2)
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