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TMS320F28335 - About Timer INT and ePWM compare timing
Other Parts Discussed in Thread: TMS320F28335Part Number: TMS320F28335
Question type: Development and troubleshooting
Support topic: /Product/Development and troubleshooting/
Description of the problem: I want to adjust ePWM compare timing to timer INT and want timer INT frequency to be twice PWM frequency. In case of the following case, What value is setting in TIMERxPRD Register and ePWM Time-Base Period Register (TBPRD)? <> (1) Time-Base Up-Count Mode (2) Time-Base Period Shadow Mode (3) LOADAMODE:Load on either CTR = Zero or CTR = PRD (I use CMPA only.) (4) Prescale Register is same as Timer prescale resister, system clock / 1.
I think, In case of TIMERxPRD = (TBPRD-1)/2, ePWM compare timing adjust timer INT.
If you wanted, you could instead use another ePWM or an eCAP peripheral to generate your TBPRD/2 interrupts. If done this way, hardware synchronization features could be used to force alignment, if desired.
Not necessarily. For example, if ePWM1 is the PWM output to your FETs, then ePWM2 could be configured to be ePWM1_PRD / 2. ePWM2 would then be responsible for generating the interrupts you need. ePWM1 would generate a synch pulse every ePWM1_PRD. ePWM2's timer would synchronize with ePWM1 when it receives the synch pulse.
