Lpc2000

Indeed!
You need...actually it is a very good idea to use the TEMT bit to 
toggle the transmit enable bit on your RS-485 interface.

For me, it would have been nice to have the TEMT bit generate an 
interrupt. My code would have been a little bit more efficient in this 
way.

As it stands, I now look for a signal that the interrupt service 
routine has processed the last byte out, (THRE interrupt, and no more 
bytes in tx queue). After this, I poll the TEMT bit. This lets me know 
that I will not 'clobber' that last byte out before disabling the 
transmitter on my RS-485 transceiver.

Ken Wada

--- In lpc2000@yahoogroups.com, "Bill Knight" <BillK@t...> wrote:
> Am I missing something here guys (and gals)?  When the FIFO is
> enabled the THRE bit in the Line Status Register is set whenever
> the FIFO can accept additional characters.  So if it were clear,
> isn't that an indication the FIFO is full?
> As for RS-485 transceiver turn-around; the TEMT bit also in the
> Line Status Register, can be used to determine when the stop bit
> of the last character has been transmitted.  Can't that be used
> to control the RS-485 interface?
> 
> Regards
> -Bill Knight
> R O SoftWare &
> http://www.theARMPatch.com