使用WDTCTL = WDT_ARST_1000;设置了看门狗，主循环里WDTCTL = WDT_ARST_1000;喂狗，程序正常工作；
当把主循环喂狗去掉，程序死掉，没有重启，WDTCTL时钟源由ACLK变为默认的SMCLK了，不明白为什么不重新启动
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MSP430FR6972 看门狗不能重新启动程序
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