27.4.4.2.1 CCPxRA = CCPxRB

If CCPxRA and CCPxRB have the same value, the output is initialized low and stays low; no pulses are generated and no Output Compare interrupt is generated (Figure 27-15). Put another way, the PWM duty cycle is 0. The Reset/clear-on-CCPxRB match logic overrides the set-on-CCPxRA match logic for a net result of no change in the output state.