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Dought on Timers of ATmega16
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gopi
Mon Jun 29 2009, 10:51AM
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Hello every one. I just want to know " What is the constant time delay maintained by atmega16 for the timers if i connect 4MhZ Crystal Oscillator with a prescaler of ÷1 ". Where as in 8051 if we connect 12Mhz XTAL then, o/p of 12Mhz is given to "÷12". That means constant time delay is 1µsec. What about Atmega16? Is there also a divider before or after the XTAL rather than the prescaler?


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gopi
Tue Jun 30 2009, 01:26AM
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rahuljin
Tue Jun 30 2009, 08:53AM

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since the timers in avr have separate circuit , they run independent of the main core. therefore ---

Timer Resolution = prescale / input frequency


so, for 5 Mhz with prescaler 1,

Timer Resolution = 0.0000002 sec or 0.2 us

[ Edited Tue Jun 30 2009, 08:54AM ]
the name is rahul
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 gopi 
gopi
Tue Jun 30 2009, 08:34PM
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Thanks Rahul.
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