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12 MHz USSB Crystal as CLKIn for C5535

Nicolas Deup
Intellectual 590 points
Hi, I have 2 questions regarding C5535 Clock : 1) Is it possible to use USB 12 MHz crystal signal as CLKIn for the C5535 rather than an external oscillator ? What are the limits for such as solution ? 2) Is it then possible to power ON and OFF this USB 12 MHz oscillator to save power when the DSP in IDLE 3 mode (ie, when DSP is running using the 32, 768 KHz crystal). Thanks. Nicolas Thanks
  • 0
    TI__Genius 12575 points

    Hi,

    Below are my response for your Questions:

     A1. Looks this is not possible. You need to use an external oscillator. Reason – There most likely exists a deadlock condition with bootloader.

    Further you could refer to C5535 eZDSP schematics (on these aspects).

    A2. This depends on A1.

    Regards

    Vasanth