Lpc2000

--- 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? 

Regards,
Ian