You are welcome.
could you explain the meaning of 0.48/1000000 in your formula ?
I'll try...
My question is: basically i have to sample a digital signal every 0,48us.
The work to be done is "sample a digital signal". You've given the processor 0.48us (480ns) to do that work. In the very best case, the microcontroller can do one thing each clock tick. The clock ticks at 16 MHz. So...
Time to Do That Work / Clock Tick Time = Clock Ticks Available in the Given Work Time
The Clock Tick Time is 1 / Clock Tick Frequency (in Hz) or 1/16000000.
The Time to Do That Work is 0.48 microseconds or 0.48/1000000 seconds.
Time to Do That Work (in seconds) / Clock Tick Time (in seconds) is (0.48/1000000) / (1/16000000).