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Michael
PostPosted: Thu Mar 06, 2014 5:32 pm 
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Joined: Wed Feb 13, 2013 1:38 pm
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Location: Michigan, USA
Anyone here familiar with the SPI implementation on the PIC microcontrollers who can double-check me, please? I know it may seem slightly off topic but it's for my little 3-chip SBC.

Microchip seems to use SPI control bit settings that are slightly different from the more familiar CPOL and CPHA bit settings and so I was wondering if my understanding of the Microchip SPI mode settings is correct in the following diagram.

Thanks in advance. Mike


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GARTHWILSON
 Post subject: Re: PIC SPI Modes?
PostPosted: Thu Mar 06, 2014 8:33 pm 
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Quote:
but it's for my little 3-chip [R65C02] SBC.
That's what makes it ok here.


Change "SCK" to "CKP" and I think it will all be correct. I don't know why they have to make it so complicated though. I never know what mode I'm in. I have to go through this stuff every time I use it for another part. I just referred again to http://en.wikipedia.org/wiki/Serial_Per ... erface_Bus. If I bit-bang it instead, I just follow the waveform charts and things work, and I still don't know what mode I'm in, but it was easier.

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Michael
 Post subject: Re: PIC SPI Modes?
PostPosted: Fri Mar 07, 2014 5:08 am 
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Location: Michigan, USA
GARTHWILSON wrote:
Change "SCK" to "CKP" and I think it will all be correct.

Argh!!! Thanks, I'll fix that...
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I don't know why they have to make it so complicated though.

I agree.

Take care.

Cheerful regards, Mike
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