Lpc2000

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!
> > > 
> > > 
> > > --- In lpc2000@yahoogroups.com, "Ken Wada" <kwada@a...> wrote:
> > > > 
> > > > There are two ways to do this:
> > > >   1. Disable the FIFO enable bit on the FIFO control register
> > > >   2. Set the Tx FIFO reset bit ont the FIFO control register
> > > > 
> > > > Ken Wada
> > > > 
> > > > --- In lpc2000@yahoogroups.com, Gerhard Unrecht <unrecht@p...> 
> > > wrote:
> > > > > Hey,
> > > > > 
> > > > > I want to clear the transmit-Fifo, to have a defined state.
> > > > > Knows anybody how to do do this?
> > > > > 
> > > > > Regards
> > > > > 
> > > > > Gerhard Unrecht
> > > > > 
> > > > > 
> > > > > [Non-text portions of this message have been removed]