Lpc2000

I have not tried this.  If the Data Book says don't do it - I 
listen.  I would rather not find out what problem it causes after 
shipping 5000 units to customers.


--- In lpc2000@yahoogroups.com, "Ken Wada" <kwada@a...> wrote:
> 
> say....
> Have you tried this? If so, what happens? Does the UART lockup or 
> something like that?
> 
> It did not occur to me to try something like this.
> 
> I suppose something bad probably will happen.
> 
> Ken Wada
> 
> --- In lpc2000@yahoogroups.com, "lp2000c" <lp2000c@e...> wrote:
> > 
> > My understanding is that this was Philips' original plan.  
However, 
> > they they discovered a bug in the operation when the FIFO is 
> > disabled, so they just added that note saying: Don't do it!
> > 
> > 
> > 
> > --- In lpc2000@yahoogroups.com, "Ken Wada" <kwada@a...> wrote:
> > > 
> > > I noticed the comment on 'proper UART' operation also.
> > > 
> > > I have used both the 16c550 and the 16c450 for many years. My 
> > > recollection is that the FIFO enable bit was supposed to change 
> the 
> > > mode to 16c450 'FIFO-less' operation when disabled; and change 
the 
> > > mode to true 16c550 mode when enabled.
> > > 
> > > In fact, the National Semiconductor datasheet on the 16c550 
says 
> > the 
> > > following:
> > > 
> > > Bit 0: Writing a 1 to FCR0 enables both the XMIT and RCVR
> > > FIFOs. Resetting FCR0 will clear all bytes in both FIFOs. When 
> > > changing from the FIFO Mode to the 16450 Mode and vice versa, 
data 
> > is 
> > > automatically cleared from the FIFOs. This bit must be a 1 when 
> > other 
> > > FCR bits are written to or they will not be programmed.
> > > 
> > > It was my understanding, according to the LPC2xxx user's 
manual, 
> > and 
> > > datasheet that, (other than not supporting the DMA operation), 
> that 
> > > these UARTS are supposed to be 16c550 clones.
> > > 
> > > Ken Wada
> > > 
> > > --- In lpc2000@yahoogroups.com, "lp2000c" <lp2000c@e...> wrote:
> > > > 
> > > > Beware the fine print that FIFO enable bit must be set for 
> proper 
> > > > operation of the UART!