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msp430f2619SPM 环境温度在135摄氏度上32.768kHZ晶振不起振



MSP430F2619SPM的PDF上说的,它工作的环境温度在-55℃~150℃,但试验发现工作环境温度为135摄氏度时,32.768KHZ的晶振不起振晶振是放置在烘箱外,串口返回固定的码值,电源供电正常,10Mhz的XT2正常,想请问一下这个怎么回事?  怎么解决?