CC2540关于watchdog的疑问

CC2540的watchdog是睡眠时候关闭的吗？只有运行的时候开启？芯片手册中写道：“The contents of the 15-bit counter are retained during all power modes, and the Watchdog Timer continues counting when entering active mode again. ” 也就是说CC2540工作在PM3功耗模式的时候是关闭的咯？

是的，WD定时器会停，然后在active mode 会恢复

You are correct.  The counter stops during power modes and continues to count when you resume active mode.