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关于C6748中UPP时钟的问题请教



请问各位,如果用upp的b端口作为发送,那么由b端口提供发送时钟,请问,无论数据是否有效,这个时钟是一直有的吗?因为我想用这个时钟作为a端口的接收时钟。谢谢。