Comerica Bank & Trust, N.A. Asset Allocation Top Instruments Asset Allocation Top Sectors Asset Allocation Top Countries Asset Allocation Top Holdings Performance Sustainability Rating Investment ...

Comerica Bank & Trust, N.A. Asset Allocation Top Instruments Asset Allocation Top Countries Asset Allocation Top Holdings Performance Sustainability Rating Investment Policy Terms Indices ...

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因此，the master device 必须产生一个额外的时钟脉冲（第九个脉冲）用以和这个响应位相关联。 在这个脉冲期间，发出响应的从设备必须将SDA拉低并在时钟脉冲的高电平期间保持住。这表示该设备给出了一个ACK。如果它不拉低SDA线，就表示不响应（NACK）。

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