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MSP430F543A单片机复位后ACLK时钟源的问题???

Other Parts Discussed in Thread: MSP430F5438A

我用的是MSP430F5438A单片机,手册上写上电复位后ACLK时钟源是XT1,而实际上我的XT1并没有设置,默认XT1相关IO口应该是普通IO口的,也就是说XT1晶振是不可用的,但为什么ACLK信号输出是正常的,它是怎么跳到REFO时钟源的。手册上默认上电是XT1时钟源的???