The upper limit of incoming signal frequency when using NRF_TIMER1 as counter

Question

I am using NRF_TIMER1 with 16-bit mode and prescaler of 0 as a counter, to count the pulses of an incoming square wave signal in a given time window. What is the upper limit of the incoming frequency for NRF_TIMER1 acting stably?

Susheel Nuguru · Accepted Answer

Looking at the image below 
 
 The count task is sampled with the frequency of Ftimer Hz.
With prescaler = 0, Ftimer = 16MHz.
So Timer module should be able to count upto this limit.