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Analog comparator

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I poked around - not an interrupt based on threshold.  You can certainly set up a regular ADC conversion based on a reference pin (the 2553 does support VREF) and write a small amount of code to address the need.  There are some 430's that can trigger an ADC conversion on a timer (http://processors.wiki.ti.com/index.php/MSP430_-_Triggering_ADC_Conversion_Using_Timer_Module) that might simplify things a bit.

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