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'[PIC]SPI with 18F'
2005\05\01@070540 by L030010

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Hi all

current i am using a 10MHZ crystal with 4X step up, when i implement spi
what is the Fosc? is it 10Mhz or 40Mhz? pls advise


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2005\05\01@165855 by Jan-Erik Soderholm

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L030010 wrote :

> current i am using a 10MHZ crystal with 4X step up, when i
> implement spi what is the Fosc? is it 10Mhz or 40Mhz? pls advise

10 Mhz with the PLL disabled.
40 Mhz with the PLL enabled.

(If you with "4x step up" ment the PLL, it might be better
to simply call it "PLL"...)

Jan-Erik.



2005\05\01@170132 by Shawn Tan Ser Ngiap

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> current i am using a 10MHZ crystal with 4X step up, when i implement spi
> what is the Fosc? is it 10Mhz or 40Mhz? pls advise

IIRC, it should be 10...

cheers..

--
with metta,
Shawn Tan

2005\05\01@170450 by Shawn Tan Ser Ngiap

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On Sunday 01 May 2005 09:59 pm, Shawn Tan Ser Ngiap wrote:
> > current i am using a 10MHZ crystal with 4X step up, when i implement spi
> > what is the Fosc? is it 10Mhz or 40Mhz? pls advise
>
> IIRC, it should be 10...
I meant that this is the max SPI speed.. (again not forming proper
statements... my bad...)

--
with metta,
Shawn Tan

2005\05\01@172435 by olin_piclist

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Shawn Tan Ser Ngiap wrote:
>> current i am using a 10MHZ crystal with 4X step up, when i implement
>> spi what is the Fosc? is it 10Mhz or 40Mhz? pls advise
>
> IIRC, it should be 10...

No, it's 40MHz.  Fosc refers to the speed the PIC logic is being driven at.
The instruction clock speed is 1/4 that, or 10MHz.


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