piclist 2000\05\26\142939a >
Thread: Microcontroller with 4 USARTs and 40 pins
www.piclist.com/techref/io/serials.htm?key=usart
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face BY : Dan Michaels email (remove spam text)



Edson Brusque wrote:
.....
>>     someone knows if there's a microcontroller with 4 USARTs capable of
>> working at 31250bps? I need extra 24 I/Os minimum. One USB port would be a
>> plus. Also, I would need an A/D converter, but I could use an external one.
>>
>>     Maybe a SCENIX can do 4 USARTs as virtual peripherals???
>>

Scenix can easily do this, **BUT** you will have to go to 48 or
52-pin PQFP part - with tiny smt pads - to get 24 additional I/O lines.
No PLCC available. [or possibly do a multiprocessor with 18 & 28
pin parts - not all that hard to build off a single RS-232 host line].

And I suspect with the scenix, you actually could get the weird
31250 rate you indicate here - or any other weird baudrate imaginable.
But whatcha gonna talk to at that speed?
================

Adam Davis wrote:
>Perhaps if you give us a little more information we can help you out more.  If
>you take an atmel or scenix micro you could fairly easily develop 4 software
>UARTs if they are all running at the same speed.  The PIC probably wouldn't run
..........

I believe with the scenix VP route, the separate UARTs do *not* have
to be running at the same bps. The VPs all run off the same basic
timer interrupt, but each uses a different divider to index its
update rate.

cheers,
- Dan Michaels
Oricom Technologies
===================

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