When complementary outputs are required on one channel, the preload bits are OCiM, CCiE and CCiNE. These preload bits are transferred to the shadow register bits when a COM commutation event occurs. This allows you to pre-set the next step configuration and modify the configuration of all channels at the same time. COM can be generated by software by setting the COMG bit in the TIM1_EGR register, or by hardware on the rising edge of TRGI.
Figure 73 shows the OCx and OCxN outputs in three different configurations when a COM event occurs.
(Figure 73: Example of STM8 generating six-step PWM using COM (OSSR=1))
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