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AN4013 データシート(PDF) 17 Page - STMicroelectronics |
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AN4013 データシート(HTML) 17 Page - STMicroelectronics |
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17 / 37 page  DocID022500 Rev 4 17/37 AN4013 General-purpose timer modes 36 The following figure resumes the asymmetric behavior versus the center aligned PWM mode Figure 1. Asymmetric PWM mode versus center Aligned PWM mode To configure the timer in this mode: 1. Configure the output pin: a) Select the output mode by writing CCS bits in CCMRx register. b) Select the polarity by writing the CCxP bit in CCER register. 2. Select the Asymmetric PWM mode (Asymmetric PWM1 or Asymmetric PWM2) by writing OCxM bits in CCMRx register. 3. Program the period, the pulse length and the phase shift respectively in ARR, CCRx and CCRy registers. 4. Select the counting mode: the Asymmetric PWM mode is working only with center aligned mode: the counter mode must be center aligned counting mode (CMS bits different from '00'). 5. Enable the capture compare. 6. Enable the counter. For more details on how to use the timer in this mode, refer to the examples provided in the STM32F30x standard peripheral libraries, in the /Project/STM32F30x_StdPeriph_Examples/ TIM/Asymmetric folders. |
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