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MSP430G2955 将GPIO设置为上拉输入功耗问题

Other Parts Discussed in Thread: ENERGYTRACE

1、硬件上给MCU使用32768khz的外部晶振;

2、供电电压3.3V、MCU运行主频16Mhz;

3、环境温度:室温(22℃)

4、测试引脚:P2.4设置为上拉输入,其余未使用引脚配置为输出低电平,关闭其他外设(定时器,串口,看门狗等);

5、测试结果:

      将P2.4输入高电平,程序进入LPM3模式,功耗在1~3uA左右;

      将P2.4输入低电平,程序进入LPM3模式,功耗在98uA左右;

6、问题:

      输入模式,对外部输入电平为何会有这样的功耗问题?