Lpc2000

At 15:02 26.04.2006 +0000, you wrote:
>--- In lpc2000@yahoogroups.com, "Don Williams" <donw@...> wrote:
> >
> > Herbert,
> > Hi There,
> > I do not believe the last advice you received is correct. When SPI
>is set
> > for "Master" the table 108 in UM for LPC2138 states  clearly that
>SSEL0 can
> > be used as a GPIO pin. Also I read its OK to use the clock edges
>which start
> > during a master transfer when set for either polarity to determine
>start and
> > end of transfer. I'm using a MAXII pld and simply writing out to a
>decoder
> > function in the PLD and generating my own SSEL0 for slave select -
>which is
> > what I understand the SSEL0 line to be used for.
> >
> > However for us pin use concious scavengers the next question is why
>cant we
> > use the MISO as GPIO if we are only using MISI ??
> > Im not game to try that one.
> > This is design only - havent debugged that bit yet.
> >
> > So if anyone states the data is incorrect please inform........
> >
> > Rgds
> > DonW
> >
>
>I think the original question concerned ssel pin when the LPC part is
>used as a slave. I don't think it is an issue of using pins that are
>not required by the application but which pins are needed.  I guess
>it would be possible to send data without any framing but I wouldn't
>want to rely on it.  How do you recover from a lost or extra clock
>pulse?

Thank you all for your input.

Yes, Ian, you are right, I really forgot the framing issue, I just thought 
when being a slave, SSEL0 is held low all the time (one should think before 
writing ...)

Regards
Herbert

>Regards,
>Ian
>
>
>
>
>
>
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