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SVS 与 RTC 冲突吗?

Other Parts Discussed in Thread: MSP430F6438

大家好:

   我在使用MSP430F6438,出现了如下问题:

  在LPM3模式下,使用RTC。

  但如果在初始化中,加入如下代码,RTC便不工作了。

  // Disable SVS
PMMCTL0_H = PMMPW_H; // PMM Password
SVSMHCTL &= ~(SVMHE | SVSHE); // Disable High side SVS
SVSMLCTL &= ~(SVMLE | SVSLE); // Disable Low side SVS
PMMCTL0_H = 00; //  

但如果不用上述代码,UART中断,SPI中断都不能工作,这是什么原因,如何三者(uart spi rtc)均可工作?