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F449的P6口和ADC输入口复用的问题

F449电源只接了DVcc1和DVss1,P6口用作ADC输入是正常工作,但用P6.3做IO口控制DS18B20时会出现跑飞现象。

当时调试时有:换不同的P6口试,都会在DS18B20初始化时死掉,而用其它IO则没有问题。声明一点,测试时只用了时钟初始化和18B20程序。想确认一下是不是电源设计不合理的原因。