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28335烧flash,运行问题

各位大神,28335烧写flash成功,挂着仿真器点运行,可以正常工作。但点停止运行,断电脱掉仿真器,重新上电不能运行。但连续上电-断电-再上电,程序又能正常运行。请问这是怎么引起的?谢谢!

28335芯片外围复位电路没有接入,将XRS引脚外部拉高电平。

X12、X13、X14、X15外部用电阻拉高了