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AN4013 датащи(PDF) 17 Page - STMicroelectronics

номер детали AN4013
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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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