AVR-Chat

10 stycznia 2005, 11:21

10 stycznia 2005, 07:59, Jeffrey napisał(a):
> I'm having some problems with my Mega8's serial port
> or crystal.

> It's programmed to use 9600 baud, but seems to
> transmit at 1200 baud.  Either I'm not doing something
> correctly (likely) or the Mega8 is running at 1/8
> speed.

> It's an 8Mhz crystal and the fuses that are set are:

>   CKSEL1
>   CKSEL2
>   CKSEL3
>   SUT0
>   BOOTSZ0
>   BOOTSZ1

> I've read the .PDF several times and don't see
> anything wrong with those settings.

> Any ideas?

> TIA,

These fuse selections indicate that mcu uses internal RC oscilator set
at 1Mhz, (see manual p. 221). I'm using serial port without problems
in this configuration. You should also limit connection speed due to
transmission errors. For exaple with internal oscilator maximal speed
with errors < 0.2% is 4800bps (see manual p. 156)

-- 
beaver

JID: bvr@jabber.org