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SPI question on BF526

Question asked by esfld on Sep 13, 2010
Latest reply on Sep 15, 2010 by esfld

I'm trying to get the bf526 to talk to the AD7908 over SPI.  It looks like I need CPOL = 1 and CPHA = 0, but when I choose this setting my select line stops going low when I'm trying to do a write.  The 526 manual says that when CPHA = 0, the SPI slave select line is automatically controlled by hardware.  Why?  What line is 'the SPI hardware' supposedly driving low?  What if I need these CPOL and CPHA settings but also need to be able to control which slave select line I want to pull low via the SPI flags?  Can someone explain?

 

Thanks,

Ethan

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