Isaac Marino Bavaresco wrote:
> Em 3/2/2010 16:58, Jan-Erik Soderholm escreveu:
>> Dwayne Reid wrote:
>>   
>>> Good day to all.
>>>
>>> I'm about to look at a project where I need to communicate with 3 
>>> serial devices.  All 3 ports will be communicating at 38,400 
>>> baud.  Although all three ports need to be able to receive data 
>>> simultaneously, transmission can be to one device at a time.
>>>
>>> I see that some of the larger (16-bit) PICs have up to 4 UARTs on 
>>> board.  However, I haven't used those devices yet and don't have a C 
>>> compiler for them.
>>>
>>> I recall discussion in the past where people have used external UARTs 
>>> with 16F PICs, connected via SPI or I2C.  Can someone remind me of 
>>> what those UARTs were?
>>>
>>> The largest packet size appears to be less than 16 bytes.  It would 
>>> be cool if these external UARTs had at least a 16-byte receive buffer.
>>>
>>>     
>> Here is one with 128 byte send and rec buffers :
>> http://www.maxim-ic.com/quick_view2.cfm/qv_pk/6463
>>   
> 
> At $4.00/unit @ 1k, it is more expensive than most PIC24 with 4 UARTs.
> Adding the cost of the MCU, it becomes more expensive than a PIC32 with
> 6 UARTs.
> 
> 
> Regards,
> 
> Isaac

There was no mention about price limit, but a larger
send/receive buffer *was* mentioned.

Anyway, noone else then Dwayne knows the tradeoffs in
this project... :-)


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