Lpc2000

--- In lpc2000@yahoogroups.com, Sean <embeddedrelated@w...> wrote:
>
> Jeff:
> 
> In the LPC manual (at least for the 2148) it says that the clock speed 
> register is unused when you are operating in slave mode -- the incoming 
> clock signal is used to latch the data.
> 
> -- Sean
> 
> At 07:03 PM 1/26/2006, you wrote:
> >Hello,
> >This is more of a general question regarding using the SPI peripherals
> >with the LPC2000 chips.  I'm somewhat new to this form of serial
> >communications, so sorry for boring all you pros out there.  I'm
> >developing with the LPC2220 chip, and am actually using the SSP
> >peripheral, which, for all intents and purposes works just like an
> >SPI, but with a few extra options.
> >
> >My question is, if you're running the processor's SPI in slave mode,
> >do you still have to set up your clock speed in the SPI registers to
> >match the SCLK speed that the external master is giving?  Or does the
> >external SCLK pretty much just clock in everything into the
> >processor's SPI data registers for you and you don't have to worry
> >about the SCLK speed (on the processor side)?
> >
> >Thanks so much in advance for your help.
> >Jeff.
>
 Sean,
This is good to know because I was going to have conflicting crystal
speed issues if it did require matching (regardless of clock
dividers).  What you've said is exactly what I had assumed, but I
looked all over the LPC2220 datasheet and it didn't specify.  There
was one part that barely implied it, but I just wanted to make sure.  
Thanks for the info.