I have an application where I need to count external pulses while the MSP430 is in low-power mode. Specifically, I wish to use a CC430 part (e.g. CC430F5125) and put it in low power mode 4 with a periodic wakeup from the WDT, having only the VLO clock enabled. I can program a Timer_A to count an external TACLK, but my question is, will it continue to count TACLK in low power mode 4? Or does the Timer_A require at least one internal clock to function? If it won't count in LPM4, what is the lowest-power mode that will support Timer_A counting an external clock signal? I've looked in the data sheet, users guide, and application notes, and I haven't found an answer to this question.
Second question: if Timer_A will count in low power mode, can a timer overflow interrupt wake up the CPU?