> Software USART did not work at all on the 12F629 and it looks like will be
> very hard to make it work.
>

It's easy to create a software UART with a timer. I've done it on the 12F683.

> The choice of using the 12F629 was only on price and for some insane reason
> I was thinking that serial communication would be a piece of cake, now I
> believe that a chip with hardware USART will be a better choice and so I ask
> for help again.
>

Hardware UART is generally easier than doing it in software.

> What PIC should I buy?
>
> The sales man says that 12F675, 12F509 and 12F683 all have hardware USART
> but I did not find any mention of it in the datasheet.
>

As far as I know, none of the 12F series have hardware UARTs. Look at
the 16F chart (http://www.microchip.com/ParamChartSearch/chart.aspx?branchID=1002&mid=10&lang=en&pageId=74)
and choose one with a UART.

-Scott
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