pwm模式是输出比较模式的一种特例，包含于输出比较模式中
/** @defgroup TIM_Output_Compare_and_PWM_modes * @{ */ #define TIM_OCMode_Timing ((uint16_t)0x0000) #define TIM_OCMode_Active ((uint16_t)0x0010) #define TIM_OCMode_Inactive ((uint16_t)0x0020) #define TIM_OCMode_Toggle ((uint16_t)0x0030) #define TIM_OCMode_PWM1 ((uint16_t)0x0060) #define TIM_OCMode_PWM2 ((uint16_t)0x0070)