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Thread: XMC4700 Set PWM Frequency while running

  1. #1
    Beginner Beginner Alberto-g is on a distinguished road
    Join Date
    Oct 2017

    XMC4700 Set PWM Frequency while running

    Hello, I need to keep the XMC PWM synchronized with an external synch signal.
    PWM frequency is nominally 16 times the external synch signal, but since it comes from a different clock it has some error.
    I would like to PLL the XMC PWM, so I need to update the PWM period from time to time, without stopping it.
    DAVE has a PWM_SVM_SetPWMFrequency but it is clearly stated it only works when PMW is stopped.
    Is there any particular reason for this?
    How can it be done?



  2. #2

    Infineon Employee
    Infineon Employee
    jferreira will become famous soon enough
    Join Date
    Oct 2012

    check the section Updating the Period and Duty Cycle in the CCU4 and CCU8 chapters.
    Each CCUx timer slice provides an associated shadow register for the period and the
    two compare values. This facilitates a concurrent update by software for these three
    parameters, with the objective of modifying during run time the PWM signal period and
    duty cycle.

    The PWM_SVM might not fit your needs. Check the PWM_CCU4 and PWM_CCU8.

    The views expressed here are my personal opinions, have not been reviewed or authorized by Infineon and do not necessarily represent the views of Infineon.

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