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TMS320F28335: 上电程序运行异常

Part Number: TMS320F28335


F28335上电时程序不运行,用万用表量3.3v\1.9V都正常,用示波器量晶振也是正常,手动复位后可以正常运行,电路上已经设计为1.9V先于3.3V供电,复位电路用的是RC电路,电阻用22k,电容用的是0.01uf的片式陶瓷电容。请问这个可能的原因是哪些呢?