25.3.3.2 Waveform Generation Modes
The TCD provides four different Waveform Generation modes controlled by
the Waveform Generation Mode (WGMODE) bit field in the Control B
(TCDn.CTRLB) register. The Waveform Generation modes are:
- One Ramp mode
- Two Ramp mode
- Four Ramp mode
- Dual Slope mode
The Waveform Generation modes determine how the counter is counting during a TCD cycle and how the compare values influence the waveform. A TCD cycle is split into these states:
- Dead-time WOA (DTA)
- On-time WOA (OTA)
- Dead-time WOB (DTB)
- On-time WOB (OTB)
The Compare A Set (CMPASET), Compare A Clear (CMPACLR), Compare B Set (CMPBSET), and Compare B Clear (CMPBCLR) compare values define when each state ends and the next begins.