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CC2541的watchdog问题



你好,在“User Guide”关于看门狗看到一句话:The contents of the 15-bit counter are retained during all power modes, and the Watchdog Timer continues counting when entering active mode again. 

我现在启用了看门狗,如果在休眠过程中程序跑飞了,这样的话看门狗岂不是就失效了?如何做才可以让看门狗不失效、防止这种事情的发生呢?

另外如下图所示,我配置的为外部时钟,但是当进入休眠的时候,寄存器就自动变为内部时钟了,请问这个是怎么回事?