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
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