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EM357-RTR 数据表(PDF) 132 Page - Silicon Laboratories |
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EM357-RTR 数据表(HTML) 132 Page - Silicon Laboratories |
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132 / 241 page  Rev 1.3 132 Figure 9.23. Center-Aligned PWM Waveforms (ARR = 8) Hints on using center-aligned mode: When starting in center-aligned mode, the current up-down configuration is used. This means that the counter counts up or down depending on the value written in the TIM_DIR bit in the TIMx_CR1 register. The TIM_DIR and TIM_CMS bits must not be changed at the same time by the software. Writing to the counter while running in center-aligned mode is not recommended as it can lead to unexpected results. In particular: The direction is not updated when the value written to the counter that is greater than the auto-reload value (TIMx_CNT > TIMx_ARR). For example, if the counter was counting up, it continues to count up. The direction is updated when 0 or the TIMx_ARR value is written to the counter, but no UEV is generated. The safest way to use center-aligned mode is to generate an update by software (setting the TIM_UG bit in the TIMx_EGR register) just before starting the counter, and not to write the counter while it is running. |
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