Re: [avr-chat] UART with internal RC osc.

[Joerg Wunsch]

"Royce Pereira" <address@hidden> wrote:

> Just wanted to check..is the internal RC oscillator sufficiently
> accurate for baud rate generation? Or is a crystal unavoidable?

Atmel says it is, if you use the calibration (OSCCAL).  I.e., if you
don't run at Vcc = 5 V, you're on your own about calibrating it.

Pessimistic people mention all kind of things that would make it not
stable enough :), I think for corner cases where you have to take into
account larger deviations of both Vcc and ambient temperature, you'd
better use a ceramic resonator at least.

-- 
cheers, J"org               .-.-.   --... ...--   -.. .  DL8DTL

http://www.sax.de/~joerg/                        NIC: JW11-RIPE
Never trust an operating system you don't have sources for. ;-)