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MRT period in repeated interrupt mode?

Question asked by Alexey Borisenko on Feb 7, 2018
Latest reply on Feb 21, 2018 by Kerry Zhou

From user guide:

 

When the timer n is in idle state, writing a non-zero value IVALUE to the INTVALn register
immediately loads the time interval value IVALUE - 1, and the timer begins to count down
from this value. When the timer reaches zero, an interrupt is generated, the value in the
INTVALn register IVALUE - 1 is reloaded automatically, and the timer starts to count down
again.

Too many words here, but how exactly to calculate period T of generated interupt sequence for given IVALUE ?

T= IVALUE?

T=IVALUE-1?

T=IVALUE+1?

It is not clear from all words spent above.

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