Specifications

dsPIC33F/PIC24H Family Reference Manual

Figure 43-16: Phase Shifting (Complementary Mode)

Figure 43-17: Phase Shifting (Independent Output Mode)

In addition, there are two shadow registers for the PHASEx and SPHASEx registers that are

updated whenever new values are written by the user-assigned application. These values are

transferred from the shadow registers to the PHASEx and SPHASEx registers on a Master time

base Reset. The actual application of these phase offsets on the PWM output occur on a master

time base Reset. Figure 43-18 provides the timing diagram that illustrates how these events are

generated.

The phase offset value can be any value between zero and the value in the PTPER register. Any

PHASEx or SPHASEx value greater than the PERIOD value is treated as a value equal to the

Period. It is not possible to create phase shifts greater than the Period. Example 43-17 provides

the PWM phase shift initialization.

PWMxH without Phase Shift

PWMxH with Phase Shift

PWMxL without Phase Shift

PWMxL with Phase Shift

PHASEx

Note: In Complementary, Push-Pull and Redundant PWM Output modes, PHASEx controls the phase shift for

PWMxH and PWMxL outputs.

PWMxH without Phase Shift

PWMxH with Phase Shift

PWMxL without Phase Shift

PWMxL with Phase Shift

Note: In Independent Output mode, SPHASEx controls the phase shift for PWMxL output, and PHASEx controls the

phase shift for PWMxH output.

(different duty cycle)

PHASEx

SPHASEx