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Re: [avr-gcc-list] howto: accurate fast usart with IntRC clock and OSCCA
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From: |
Joerg Wunsch |
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Subject: |
Re: [avr-gcc-list] howto: accurate fast usart with IntRC clock and OSCCAL |
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Date: |
Wed, 28 Feb 2007 20:40:54 +0100 (MET) |
David McNab <address@hidden> wrote:
> So it occurred to me that, if accurate timing for other
> functionality is not critical, and if one is using the internal
> clock, one can tune OSCCAL to get very close to the real target
> baudrate.
> If one wants good timing, one can recompile the code with:
> #define F_CPU 7372800
> and end up with reasonable timing with the delay function
IIRC, 7.3728 MHz is guaranteed to be in the range that can be tuned
with OSCCAL, I guess what reasons the engineers might have had in mind
when they spec'ed it that way. ;-)
--
cheers, J"org .-.-. --... ...-- -.. . DL8DTL
http://www.sax.de/~joerg/ NIC: JW11-RIPE
Never trust an operating system you don't have sources for. ;-)