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Hi,
what is acceptable jitter of PWM when HRPMW is enabled?
After some tests I have (generate 25600Hz clock divided by 512 to get 50Hz signal):
- HRPWM off - about 450uHz
- HRPWM on HRCNFG.EDGMODE 0 - 7000uHz
- HRPWM on HRCNFG.EDGMODE 1 - 13500uHz
- HRPWM on HRCNFG.EDGMODE 2 - 7000uHz
- HRPWM on HRCNFG.EDGMODE 3 - 13500uHz
I have only TBPRD:HR register set because I need to set fractional TBPRD value.
Is this correct behaviour of HRPWM? Afcourse mean value is valid but output signal has more jitter than without HRPWM.
OK,
I found answer for my problem.
I think this post is very importnat and datasheet of all HRPWM enabled devices should be modified: TMS320F28075: HRPWM anomaly under certain conditions - C2000 microcontrollers forum - C2000™︎ microcontrollers...
Part Number: TMS320F28075 Other Parts Discussed in Thread: TMS320F28035
Hi everyone,
I'm encountering a problem with HRPWM similar to the one mentioned in this
Very important thing that you must modify HRLOAD register to selected EDGMODE. I think this is misunderstund, because I was thinking that HRLOAD is only for loading from shadow register to active register of value that I modifiy, but this isn't true by 100%. True purpose of this setting is to tell when to load new HR value regarding to working MEP module.
I think that datasheet should be updated to bo more clear about HRPWM module - informations about configuration and working of HRPWM module (and connections, etc.) are not fully understendable and valid/clear.
