当选用外部时钟时，AW32的ICG中，ICGC1寄存器中的HGO像RANGE一样影响外部晶振的选择。
FBE模式，如果HGO=1，Xtal范围为1MHz-16MHz.
如果HGO=0，Xtal范围为1MHz-8MHz.
数据手册却告诉我们：
High Gain Oscillator Select — The HGO bit is used to select between low power operation and high gain operation for improved noise immunity. This bit is write-once after reset.
0 Oscillator configured for low power operation.
1 Oscillator configured for high gain operation.
丝毫没提上一点。难道又是我理解错？？
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