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need help DsPIC33FJ clock out, or PWM out

 
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kutkm_ti



Joined: 19 Jul 2007
Posts: 9

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need help DsPIC33FJ clock out, or PWM out
PostPosted: Wed Mar 02, 2011 3:00 am     Reply with quote

Need help DsPIC33FJ128GP802 clock out, or PWM out.

I'm new to DsPIC33F, now I modify SD card wav player from http://koonlab.com/UltimateSource.html

But I want to change the DsPIC to 28pin DsPIC33FJ128GP802, and use high speed external clock without PLL to eliminate jitter. (default is using 11.2896MHz with PLL.)

Now I want to use 67.7376MHz external clock to the DsPIC33FJ128GP802 OSC1,
Code:

_FOSC(FCKSM_CSDCMD & OSCIOFNC_OFF  & POSCMD_EC);                   
// Clock Switching and Fail Safe Clock Monitor is disabled
// OSC2 Pin Function: OSC2 is Clock Output
// Primary Oscillator Mode: EC, External

Is this correct setting?

What is the frequency for OSC2 Clock Output? can it be 33.8688MHz or 11.2896MHz?

If can not, can I use PWM to generate 33.8688MHz or 11.2896MHz?
How to set the PWM?

Thanks.
xeratule



Joined: 22 Feb 2011
Posts: 1

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PostPosted: Fri Mar 04, 2011 11:15 am     Reply with quote

Hi, kutkm_ti
you can't connect above 40mhz external crystal to dspics. you need to use pll to have your desired 67mhz.
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Erhan KUŞ
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