15.4.3.2.3 Dual PWM Mode

The Dual PWM mode allows a single PWM Generator to produce two independent pulse widths on the PWMx output pins. This mode is the equivalent of Independent Edge mode, except that it allows a second PWM pulse to be produced if the Independent Output mode is used. The Dual PWM modes are selected when MODSEL[2:0] (PGxCON[2:0]) = 010. The PGxTRIGA and PGxTRIGB registers function as a second set of PGxPHASE and PGxDC registers to allow control of a second duty cycle generator. Figure 15-8 shows the relationship between the control SFRs and the output waveform.

The PGxTRIGA and PGxTRIGB event output signals continue to operate normally in this mode, and can still be used as phase offset triggers for other PWM Generators, ADC triggers, etc. If an independent trigger is needed, the PGxTRIGC register can be used. For additional information on ADC triggers, see ADC Triggers.

Since the PWM signals produced on the PWMx pins are produced from the same PWM Generator, they will be equally affected by any PWM Control Input (PCI) signals that are enabled. The PWMx pins will be driven to the states defined in the PGxIOCONx registers. Therefore, it is important that the two PWM outputs be used for related application functions if the PCI signals are to be used.