Re: [AVR-Chat] Fw: begginer2
2007-11-27 by Jim Wagner
This register is factory calibrated. From the factory, the
accuracy is according to the value in the specification
sheet.
You only need to do something with it if factory accuracy
is not good enough. However, there is quite a bit of
variation with temperature and power supply voltage. So,
even if you do get it more accurate at room temperature, it
may not help you much at another temperature or a different
supply voltage.
If you need more accuracy for RS232, then use at least an
external ceramic resonator (if that chip works with one).
Otherwise, use a crystal. It is not hard, it does not cost
much, and will make the frequency 0.1% or better over the
full temperature range.
Jim
On Tue, 27 Nov 2007 16:15:48 -0800 (PST)
mido glgl <top_speed_2006@yahoo.com> wrote:
> Dear all;
> i want ask about Calibrated Internal RC
> Oscillator and Oscillator Calibration Register ? OSCCAL
> for ATmega8535(L)
> As i need to understand it .so if anyone can explain it ,
> i will be pleasure.
> if u want to read about it click here
> Thanks for all
>
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