Using power solutions to extend battery life in MSP430 applications

For example, an MSP430 system operating 

with a 7-MHz maximum clock frequency may require the 

input voltage to be 3.3 V. If the clock speed is reduced to 

4.6 MHz, the MSP430 requires only a 2.0-V input voltage. 

If the MSP430 is placed into low-power mode, the 

required input voltage is only 1.8 V.

 

 

Is my understanding correct? And what happens to a clock when the voltage is too low?

The article does not say anything about the merits of executing faster and, as a result, sleeping more. 

So.. for a very slow, very low power app, which voltage is the best?