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ARM9 Frequency scaling

Hello,
I am currently working on a ARM9 based System on Chip. I would like to experiment with Frequency scaling on the CPU, but I have the following issue:
The main PLL is used at the same time by an hardware codec, and the ARM ... So I was wondering if there is any internal PLL on the ARM9 which would allow me to perform DVFS without touching this main PLL ?
At first sight, the reference manual doesn't mention any, but maybe I misread it ...

Regards,

Nicolas DEROUINEAU

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  • Although I can probably not answer your question (because I am not very experienced with ARM9), I think others may be able to answer it, if you can be more specific on the manufacturer and part number.

    I do believe that most (if not all) ARM9 have a PLL, but the way they're implemented might differ from manufacturer to manufacturer and from part number to part number.

    -For instance, a LPC1768 from NXP (which is Cortex-M3) may have a different PLL than LPC1788 from the same manufacturer, even though the LPC1788 is also a Cortex-M3. I believe it's similar with ARM9.

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  • Although I can probably not answer your question (because I am not very experienced with ARM9), I think others may be able to answer it, if you can be more specific on the manufacturer and part number.

    I do believe that most (if not all) ARM9 have a PLL, but the way they're implemented might differ from manufacturer to manufacturer and from part number to part number.

    -For instance, a LPC1768 from NXP (which is Cortex-M3) may have a different PLL than LPC1788 from the same manufacturer, even though the LPC1788 is also a Cortex-M3. I believe it's similar with ARM9.

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