As far as we can tell, in the MSP430F543# line, the hardware I2C modes always consume more power than bit banged because they leave the lines pulling against the resistors far to long. Also, the trailing edge of the clock pulse is dangerously close to the change of the data line.
I2C Master Bit Banged code from Dan Bloomquist as posted to firstname.lastname@example.org
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<A HREF="http://www.piclist.com/techref/ti/msp430/iics.htm"> TI MSP430 Microcontroller I2C</A>
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