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TMS320F280049: HRPWM operation logic

Minghan Dong
Prodigy 360 points
Part Number: TMS320F280049
Other Parts Discussed in Thread: TIDM-02002

Hi BU friends,

(1) Q format in HRPWM

If we use CMPA(CMPAHR), we need to write the CMPA:CMPAHR:reserver bits.

It seems use Q16 in this situation. Why PWM duty in Q15 format? Up-down counter?

(2) The CMPxHR must be bigger than 0x0100? The TIDM-02002 use the codes:

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//
// the below is to get around the errata in HRPWM
//
if((CLLLC_pwmDutyASec_ticks & 0x00FF00) == 0)
{
CLLLC_pwmDutyASec_ticks = CLLLC_pwmDutyASec_ticks | 0x000100;
}
XXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX

(3) The rounding 0x0080 add the CMPxHR automatically or manually? 

(4) What's the difference between HRCNFG.CTLMODEx=1 or =0?

What 's the means of CMP/TBPRD controls the MEP?

What 's the means of TBPHS controls the MEP? Could you give a example?

Thanks,

Minghan

  • 0
    TI__Guru 52010 points

    1. CMPA and CMPAHR combine as shown in the equations in our driverlib examples.

    2. Thats correct, the values should be from 1 to FF

    3. Rounding should be manual

    4. You decide between duty/period HR control and Phase control. Whichever one you need in your application.