0x0000
0xFFFF
CTR=CMPA
TBCTR[15:0]
CMPA
(value)
CMPB
(value)
TBPHS
(value)
TBPRD
(value)
CTR=CMPB
EPWMxSYNCI
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ePWM Submodules
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SPRUI07–March 2020
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Enhanced Pulse Width Modulator (ePWM) Module
3.2.3.4 Count Mode Timing Waveforms
The counter-compare module can generate compare events in all three count modes:
• Up-count mode: used to generate an asymmetrical PWM waveform.
• Down-count mode: used to generate an asymmetrical PWM waveform.
• Up-down-count mode: used to generate a symmetrical PWM waveform.
To best illustrate the operation of the first three modes, the timing diagrams in Figure 3-14 through
Figure 3-17 show when events are generated and how the EPWMxSYNCI signal interacts.
Figure 3-14. Counter-Compare Event Waveforms in Up-Count Mode
NOTE: An EPWMxSYNCI external synchronization event can cause a discontinuity in the TBCTR count
sequence. This can lead to a compare event being skipped. This skipping is considered normal operation and
must be taken into account.
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