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CC2530 GPIO输出漏电流问题

我目前项目中使用了Zstack 终端节点的功能,使用了裸模块,其正常情况下电流为6uA左右。但是当我配置一个P0.6口为输入下拉模式或者输出0V,P0.6口接2K电阻到地后,其电流居然为140uA左右。我很想知道IO口在低电平情况下导通后为什么有漏电流存在。