Em 3/2/2010 18:46, Bob Axtell escreveu:




>> 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
>>     =

> Dwayne,
>
> Why don't you connect 4 PIC16Fs in an I2C arrangement? Each one would be =

> a UART port?
> The PIC16F87 comes to mind...One as I2C master, 3 slaves...
>
> --Bob
>   =


Some points against this idea:

1) You would need to write two different firmwares (if you use the same
parts for master and slave, take care not to mix them);
2) Program the three slaves with different addresses (or waste at least
two pins for address);
3) Deal with an extra protocol (I2C) and bus (don=B4t forget that some
PIC=B4s I2C modules don=B4t work well in slave mode);
4) I2C is slow, its bandwidth may be insufficient for three 38400bps
channels;
5) Use more board area than one single bigger chip;
6) May cost more than a PIC32.
And more...

Best regards,

Isaac
__________________________________________________
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