Hello I would recommend a Philips LPC2104 with dual Uarts. Consumes low power and is available in 48 pin tqfp.
Thanks/Harsha At 2004-06-15 00:48, Roger Morella wrote: >>I'm looking for a microcontroller with 2 onboard serial UARTS so I can >>implement add a dual RS485 function to am existing design. A parallel >>slave port to integrate to my host circuit would also be useful. A 44 >>pin PLCC form factor would also help. Does anyone out there have any >>idea devices that they have had positive results with? > > You could also consider implementing some software > based UART's when your maximum bitrate is not too > high. > > The 6811 for example has nice counters/timers with which > it's quite easy to do. Output isn't really a problem, but > input might be: First program a counter/timer to notice > the beginning of the startbit. Then check again half a > bit time later if the line is still in the 0-state. After > that you can sample again after every bit-time (so half > way during each bit-period), but it's better to over- > sample and read the level three times during each bit > and go for the 2 or more out of 3, to exclude spikes. > > Another way to implement more UARTS is by connecting > special chips to a serial bit-shift port like the > SPI-interface on the 6811. > > See also: > http://www.chipdir.nl/uart.htm > > > Greetings, > Jaap > > -- Chip Directory > -- http://www.chipdir.biz/ > -- http://www.chipdir.info/ > -- http://www.chipdir.net/ > -- http://www.chipdir.nl/ > -- http://www.chipdir.org/ > -- And about 30 other mirror sites world-wide. > -- > -- To subscribe to a free 'chip issues, questions and answers' > -- mailing list, send a message to [EMAIL PROTECTED] with > -- in the body 'subscribe chipdir-L'. About 500 experts are > -- willing to think with you about electronics problems etc. > > -- > Author: Jaap van Ganswijk > INET: [EMAIL PROTECTED] > > Fat City Hosting, San Diego, California -- http://www.fatcity.com > --------------------------------------------------------------------- > To REMOVE yourself from this mailing list, send an E-Mail message > to: [EMAIL PROTECTED] (note EXACT spelling of 'ListGuru') and in > the message BODY, include a line containing: UNSUB CHIPDIR-L > (or the name of mailing list you want to be removed from). You may > also send the HELP command for other information (like subscribing). > -- Author: INET: [EMAIL PROTECTED] Fat City Hosting, San Diego, California -- http://www.fatcity.com --------------------------------------------------------------------- To REMOVE yourself from this mailing list, send an E-Mail message to: [EMAIL PROTECTED] (note EXACT spelling of 'ListGuru') and in the message BODY, include a line containing: UNSUB CHIPDIR-L (or the name of mailing list you want to be removed from). You may also send the HELP command for other information (like subscribing).
