AVR-Chat

For the UART and usual baudrates, this lag is
unimportant but I would like having a hardware buffer
for the SPI unit, and have additional flag indicating
byte move buffer to transmit shift register. Motorola
implements such feature in its micros.

Murat Karadeniz
http://www7.brinkster.com/mukas/

--- upand_at_them <upand_at_them@yahoo.com> wrote:

> 
> > Well, you can't shove chars in faster than they go
> out..
> 
> Obviously.
> 
> But I noticed the two stage pipeline.  and if you
> wait until 
> something comes out the end of the pipe before you
> put anything in it 
> cuts the speed down.  I just didn't know the lag
> between data 
> register and transmit register.  If it's just a
> clock cycle or two, 
> then you're right, it won't matter.
> 
> MK
> 
> --- In AVR-Chat@yahoogroups.com, Dave VanHorn
> <dvanhorn@d...> wrote:
> > At 11:56 AM 10/8/2004, upand_at_them wrote:
> > 
> > 
> > 
> > >For transmit, does checking TXC instead of UDRE
> limit the max 
> > >transmit speed? 
> > 
> > Well, you can't shove chars in faster than they go
> out..
> > 
> > > And what is the lag between writing to UDR and
> it 
> > >getting put into the transmit shift register?
> > 
> > Essentially zero.
> > I've never measured it, but it's not much.
> 
> 
> 
> 



		
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