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28335低温不能及时启动,几十秒后恢复正常



28335在低温状态下(-40°C左右)经常经常会出现不能及时启动情况(程序没有跑起来),但是过了几十秒钟后又能恢复正常工作,而常温能正常启动,请问会有什么原因导致这个问题出现?另外,这款DSP芯片采用外部晶体振荡方式的话对晶体及其匹配的电容有什么特别的要求?(测量过,DSP核电源与IO口电源上电时序正常)