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CC1200，使用外部40MHZ TCXO。使用SPWD进入POWER DOWN模式，如果进入POWER DOWN模式后关闭外部40M TCXO的供电电源,则CC1200工作不正常，难道不能关闭40M TCXO的电源吗？这样将浪费1毫安左右的电流。
POWER DOWN 模式的条件是：Low-power RC oscillator running
在发SPWD命令之前让Low-power RC oscilator running（WOR_CFG0.RC_PD=0)效果也一样,难道还有别的寄存器还要配置？
