MSP430 : Internal timers during interrupt servicing are active?

Hi!

I am currently writting some code for an MSP430F5438 uC for a data acquisition project and I have a really n00b question to ask.

I have set up one internal timer in up mode. It counts up to a value contained in a register, then an interrupt is thrown and the timer starts counting from zero again. When this interrupt is created, the ISR routine just brings the uC in active mode to take some measurements and then go to sleep again. During this active mode, some other interrupts may be thrown (like DMA or ADC interrupts). My question is whether the timer keeps counting, while an interrupt is being serviced in an ISR routine. This is important to know, since I need to find out how precisely the sample rates that I use are kept.

Thanks!
Nick

The timers are attached to the clock source and count even when ISR's are being serviced.