Load Active Counter-Compare A/B (CMPA/CMPB) from shadow F28377D

Hi,

 We are generating phase shifted PWM signals from F28377D  for cascaded multilevel converter. The carrier frequency is around 450 Hz. only.  We are loading the counter compare registers on either CTR = Zero or CTR = PRD ( CMPCTL.LOADBMODE  = 10)  from shadow register. Therefore, the sampling for 50 Hz modulating signal is only 36 (450/50*4) .  If we use immediate mode, the results become very noisy and the output is nowhere to the sinusoidal.

Is there any way to upload the counter-compare register from shadow register in much faster rate? Is it possible to upload counter-compare register for external event?

-Shambhu