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Measuring CCLK on ADSP-21479 ezboard

Question asked by Cedrikos on Jan 13, 2016
Latest reply on Jan 18, 2016 by Cedrikos

Hi there.

 

I am trying to measure the core clock on an ADSP-21479 ezboard with an oscilloscope.

I am using test point TP27 and I set the CLKOUTEN to 1 in the PMCTL register.

I am surprisingly getting a clock frequency of 16.6MHz, which corresponds to that of the crystal, while I would expect a core clock of about 266MHz.

 

I was basically trying to modify the core clock by setting different PLL multipliers, and trying to measure the effective clock. But it seems I cannot get access to the core clock on the board.

 

What am I missing?

 

Thanks for your help.

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