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MSP430F6 XT1供电电源必须是AUXVCC3么

Other Parts Discussed in Thread: MSP430F6736

现在使用TI的MSP-TS430PZ板子进行测试.发现AUXVCC3连接VCC的情况下,XT1(ACLK测)能够持续发振

.如果AUXVCC3不连接VCC情况下, XT1(ACLK测)起振DCO稳定后, XT1就消失了,MCLK的频率也降下来了。

请问,XT1是必须由C供电的么?有没有什么地方可以设定不用AUXVCC3供电,只要有VCC就可以呢 ?