Posted on May 17, 2011 at 14:15 Hi Mehmet, If you are using ST library you should use this config: TIM_OCInitStructure.TIM_OutputNState = TIM_OutputNState_Disable; To disable break functionality use: TIM_BDTRInitStruct->TIM_Break = TIM_Break_Disable; Tell if you are using register access level (perhaps I can help you) MCU Lüfter