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I-8088W API Reference Manual, Version 1.0.0, Aug. 2010 --- 24
You will see the different between following two pictures.
Start PWM:
In previous sections, we can start PWM by software command or DI trigger
signal, but you can see the signal is non-synchronous in below picture.
Start Synchronous PWM:
So, we can call i8088W_Sync_Start or pac_i8088W_Sync_Start to start the
PWM output and synchronize the rising edge for each synchronous PWM
pulse.
Non-synchronous
Synchronous