NuMicro™ Mini51 Technical Reference ManualFeb 9, 2012 Page 204 of 342 Revision V1.03NUMICRO™ MINI51 TECHNICAL REFERENCE MANUALIn Power inverter applications, a dead-zone insertion avoids the upper and lower switches of the halfbridge from being active at the same time. Hence the dead-zone control is crucial to proper operationof a system. Some amount of time must be provided between turning off of one PWM output in acomplementary pair and turning on the other transistor as the power output devices cannot switchinstantaneously.5.10.5.4 Synchronous modeSynchronous mode is enabled when PWMMOD[1:0] = 10.In the synchronization mode the PWM pair signals from PWM Generator are in-phase.PG1=PG0, PG3=PG2 and PG5=PG4.5.10.5.5 Group modeGroup mode is enabled when GRP (PCR[30]) = 1.This device support Group mode control. This control allows all even PWM channels output to beduty controllable by PWM0 duty register.If GRP = 1, both (PG2, PG3) and (PG4, PG5) pairs will follow (PG0, PG1), which imply;PG4 = PG2 = PG0;PG5 = PG3 = PG1 = invert (PG0) if Complementary mode is enabled (PWMMOD[1:0] = 01)For Application, Please do not use Group and Synchronous mode simultaneously because theSynchronous mode will be inactive.5.10.6 Polarity ControlEach PWM port of PWM0 ~ PWM5 has independent polarity control to configure the polarity ofactive state of PWM output. By default, the PWM output is active high.The following diagram shows the initial state before PWM starts with different polarity settings.
