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F2812 adjustable duty cycle of the PWM wave output. Function: PWM1 and PWM2 output frequency is 1KHz PWM waveform. Waveform s duty cycle changes every 1s 5 , range 10 to 90 . Description: EVA the following general-purpose timers T1 work in the continuous up/down counting mode, resulting in symmetric PWM waveform. Through the T1 cycle interrupt time, change every 1 minute duty cycle of 1s. Dead time of 4.27us.