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CC1310: CC1310在跑系统时调用关闭中断的API

Part Number: CC1310

我在一个低优先级的任务里调用  uintptr_t key;     key = HwiP_disable();    这段代码。发现在除能中断后,高优先级任务并不能抢断低优先级任务了,定时器中断也进不了,但是看门狗还能正常运行,还能进看门狗中断,。有点理解不了,请问能否解惑一下除能中断这个API的作用,能使哪些功能失效等。