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1. 请检查电源是否供电能力充足,特别是3.3V.
2. 请检查是否3.3V的所有引脚都已经是3.3V了,有可能有虚焊的情况,某个3.3V没有供电。
3. 换个仿真器试试。
4. 是所有的板子都是这样,还是某个板子的单独情况。
5. 锁住了,一般电源的可能性会比较大