The time-base counter operates in one of four modes:
- Up-count mode which is asymmetrical.
- Down-count mode which is asymmetrical.
- Up-down-count which is symmetrical.
- Frozen where the time-base counter is held constant at the current value.
To illustrate the operation of the first three modes, Figure 12-2610 to Figure 12-2613 show when events are generated and how the time-base responds to an EPWMxSYNCI signal.
Figure 12-2611 EPWM Time-Base Down-Count Mode Waveforms Figure 12-2613 EPWM Time-Base Up-Down Count Waveforms, EPWM_TBCTL[13] PHSDIR = 1 Count Up on Synchronization Event