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求助:MSP430F5341时钟和电源的问题

Other Parts Discussed in Thread: MSP430F5341

1.我需要25MHz的系统时钟,看MSP430F5341内部的时钟可以任意配置,那么最小系统就没必要再接外部晶振了吗?

2.我打算用这个单片机实现spi数据传输,用不到AD功能之类的,只需要SPI接收信号和UART发送,这样还需要连接模拟电源信号吗?还有看有一个DVCC2,但是DVSS却有DVSS2和DVSS3,这两个脚可以共DGND吗?

希望大家帮帮忙啊。。。