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STM8S データシート(PDF) 148 Page - STMicroelectronics |
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STM8S データシート(HTML) 148 Page - STMicroelectronics |
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148 / 467 page  16-bit advanced control timer (TIM1) RM0016 148/467 DocID14587 Rev 14 Figure 41. Counter timing diagram, fCK_CNT = fCK_PSC, TIM1_ARR = 06h, ARPE = 1 Hints on using center-aligned mode: • When starting in center-aligned mode, the current up-down configuration is used. It means that the counter starts counting up or down depending on the value written in the DIR bit in the TIM1_CR1 register. Moreover, the DIR and 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 if a value is written in the counter that is greater than the auto-reload value (TIM1_CNT>TIM1_ARR). For example, if the counter is counting up, it continues to do so. – The direction is updated if 0 or the TIM1_ARR value are written in the counter but no UEV is generated. • The safest way to use center-aligned mode is to generate an update by software (setting the UG bit in the TIM1_EGR register) just before starting the counter. Avoid writing to the counter while it is running. |
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