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Timer64Plus write to Timer Count Registers while counting?

MikeH
Guru 15580 points

Is it legal to write to TIM12 or TIM34 while the counter is actively counting? Will there be any negative effects?

Thx,

MikeH

 

  • 0
    TI__Genius 15990 points

    Hi MikeH,

    On OMAPL1x processors, TIM12 and TIM34 are protected by hardware and cannot be written to while the timer is active.  Please refer to section 2.1.5.2 Writing to Registers of an Active Timer in the Timer User Guide (http://www.ti.com/lit/ug/spruh77/spruh77.pdf).

    Regards,

    Melissa

  • 0 in reply to melissaw
    Guru 15580 points

    Melissa,

    Thanks for pointing this out. I completely missed it in SPRUFM5.pdf.

    Is there any way to pause the timer, change the value of TIM12, then continue counting with the updated value?

    Mike

     

  • 0 in reply to MikeH
    TI__Genius 15990 points

    Hi Mike,

    You can disable or pause the timer by writing 0 to the ENAMODE12 bit of the TCR register.  Then write a new value to TIM12.  When the timer is re-enabled (by writing 1 to the ENAMODE12 bit), the timer will begin counting from this new counter value.

    Regards,

    Melissa

  • 0 in reply to melissaw
    Guru 15580 points

    Melissa,

    mwatkins said:
    You can disable or pause the timer by writing 0 to the ENAMODE12 bit of the TCR register.  Then write a new value to TIM12.  When the timer is re-enabled (by writing 1 to the ENAMODE12 bit), the timer will begin counting from this new counter value.

    Perfect! Thanks.

    MikeH