MSP430F1232 Power Consumption LPM3 w/1.8MHz crystal

Well, you have to consider that in high-frequency mode the crystal oscillator consumes more current. Note that there are two oscillator designs where you basically switch between when you select either low frequency or high-frequency mode. Each oscillator design has its own current consumption. Beside this you will also see that in the CMOS design the clocking of the digital parts causes an average current. In CMOS designs the current consumption is mainly caused by the edges seen in the MCU. If you increase the frequency you will also increase the current. Changing the frequency from 32kHz to 1.8MHz will cause a change of the current by a factor of around 56.