15.4.4.5 Combinatorial Triggers

Complex triggering algorithms can be created using the combinatorial trigger feature. There are two independent combinatorial trigger circuits: A and B. This feature allows trigger outputs from multiple PWM Generators to be combined into a single trigger signal, to be used as the trigger source for another PWM Generator.

The input signals used as sources for the combinatorial trigger logic are the trigger outputs selected by the PGTRGSEL[2:0] control bits in each PGxEVT1 control register. This trigger output can either be End-of-Cycle (EOC) or one of the three PGxTRIGy (y = A, B or C) compare events. These trigger output signals can be enabled and logically OR’d together by setting the appropriate bits in the CMBTRIGH/CMBTRIGL registers. The Combinatorial Trigger A and Combinatorial Trigger B outputs are then made available on the PWM Control Input (PCI) logic input multiplexers and routed through the PCI logic for synchronization. Finally, the signal can then be selected as a PWM Generator’s input trigger. A block diagram showing an example is shown in Figure 15-38. See PWM Generator Triggers for details on triggering.