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28035 pwm 为何计数器>周期值?



请问,有没有遇到现在的情况:pwm 移相 ,pwm2移相120°,增计数

                    pwm2的 计数器等于相移值后,计数到相移值+周期值后,再降到相移值,然后再计数到周期值,循环往复,计数器>周期值,而且计数器不清零,我知道是和移相配置有关,但是不知道是哪块地方?