Specifications

Section 43. High-Speed PWM

High-Speed PWM

43.6.8 Dead Time Insertion in Center-Aligned Mode

While using Center-Aligned mode and complementary PWM, only the ALTDTRx register must

be used for dead time insertion. The dead time is inserted in the PWM waveform is illustrated in

Figure 43-15.

Figure 43-15: Dead Time Insertion in Center-Aligned Mode

43.6.9 Phase Shift

Phase shift is the relative offset between PWMxH or PWMxL with respect to the master time

base. In Independent Output mode, the PHASEx register determines the relative phase shift

between PWMxH and the master time base. The SPHASEx register determines the relative

phase shift between PWMxL and the master time base. The contents of the PHASEx register are

used as an initialization value for the PTMRx register and the contents of SPHASEx register are

used as an initialization value for the STMRx register.

Figure 43-16 and Figure 43-17 provide example waveforms for phase shifting in Complementary

mode and Independent Output mode, respectively.

Note: With IUE = 1, all the three cases as described in 43.13 “Immediate Update of

PWM Duty Cycle” hold good in Center-aligned mode.

ALTDTRx ALTDTRx

PWMxH

PWMxL

PDCx

Period

2x Period

PHASEx