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ool_write(PMU_REG_CLK_CONFIG, ool_read(PMU_REG_CLK_CONFIG) | 0xc0); 这样设置的话PMU时钟不就是32K（由24M分频出来的么），即RTC时钟不就是32K时钟？现象是用次设置ALARM产生不了，内部RC和 RC/2是可以产生ALARM