On 12/7/06, Wouter van Ooijen <wouter@voti.nl> wrote:
>
> >> btw Wouter,
> >> do you already sell "TTL-232R cable from FTDI" ?
>
> no
>
> > I think the OP needs to clarify if his app already uses a PIC
> > if it does
> > then adding an FT232RL actually takes up more space.
>
> but then he should realise that using the PIC as USB slave will eat a
> lot of resources (CPU, flash, RAM).
>
> Wouter van Ooijen
>
Resources yes but if you are using a PIC you need to implement the serial
routines anyways so you need some flash for that, so if you have 3 K of
spare flash (10% on a 18f2550) and a few cycles to spare   it's clearly
cheaper (imho) to utilize a PIC vs an FT232RL. I guess the Serial routines
could take up at least 300-500 bytes? so incrementally you are only looking
at 2.5 K

As for RAM sure if you do not have the additional 80-120 bytes needed you
are better off with the FTDI solution, but at $ 3.00 to $ 4.00 that's an
additional $ resource that you need to budget for :-)
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