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MSPM0G3507: 串口时钟源lfxt外部低速晶体,9600波特率无法和nb模组正常交互

Part Number: MSPM0G3507

串口时钟使用系统高速时钟9600波特率,配合bc95物联网模组正常通讯。但配置为外部低速晶体后9600波特率,发送的貌似bc95模组可以识别,但模组应答的好多乱码。咋回事?