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Thread: xmc4100 Clocks

  1. #1
    harshan
    Guest

    xmc4100 Clocks

    Hi,
    The clock Details i found in In XMC4100 reference manual are as follows
    External Clock: Which we will Connect to the Board and mine is 12Mhz
    Slow Internal Clock: Fosi 32.768Khz.
    My doubt is what is Fast Internal Clock: Fofi ??

    i got only how to configure the Fofi i didn't find what is the Fast Internal Clock in Reference manual and Data Sheet??

    Thanks And Regards,

  2. #2
    chismo is on a distinguished road
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    Hello,

    The Fofi is the back up clock source. Description from the reference manual (V1.5 2014-04, page 488) is as follows:

    "The backup clock f_OFI generated internally is the default clock after start-up. It is used for
    bypassing the PLL for startup of the system without external clock. Furthermore it can
    be used as independent clock source for the watchdog module or even as system clock
    source during normal operation. While in prescaler mode this clock is automatically used
    as emergency clock if the external clock failure is detected."

    Regards,
    Min Wei

  3. #3
    harshan
    Guest
    Thanks for Reply,
    Thanks for Useful Information i didn't find the back up clock frequency in XMC4100 reference manual. may i know how much frequency the Backup Internal Clock fofi is produced. like Fosi = 32.768KHz.

  4. #4
    chismo is on a distinguished road
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    This information can be found in the data sheet v1.2 2014-06, section 3.3.5 on Internal Clock Source Characteristics.

    The Fofi is 36.5 MHz uncalibrated and 24 MHz calibrated.

    Regards,
    Min Wei

  5. #5
    harshan
    Guest
    Thank you very useful.

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