AVR-Chat

thanks Jim but u mean that by control of temprature and power supply i can vary frequency of this clk??? can u more explain about this clk???

----- Original Message ----
From: Jim Wagner <jim_d_wagner@applelinks.net>
To: AVR-Chat@yahoogroups.com
Sent: Tuesday, November 27, 2007 3:47:16 PM
Subject: Re: [AVR-Chat] Fw: begginer2










  


    
            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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