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msp430F149寄存器BCSCTL1 的频率高低的疑问

Other Parts Discussed in Thread: MSP430F149

MSP430F149中时钟模块的寄存器BCSCTL1 中:

XT2OFF:是否关闭高频震荡器。0开;1关。

XTS:选择低速晶体振荡器的工作方式(其实低速晶体振荡器也可以接成高速晶体的)。0为低;1为高。

那么多低频率算低,多高频率开始算高?

如果这样有写无问题:BCSCTL1&=~(XTS+XT2OFF);