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전자부품 데이터시트 검색엔진 |
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전자부품 데이터시트 검색엔진 |
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RM0016 데이터시트(PDF) 152 Page - STMicroelectronics |
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RM0016 데이터시트(HTML) 152 Page - STMicroelectronics |
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152 / 467 page  16-bit advanced control timer (TIM1) RM0016 152/467 DocID14587 Rev 14 17.4.2 Internal clock source (fMASTER) If both the clock/trigger mode controller and the external trigger input are disabled (SMS = 000 in TIM1_SMCR and ECE = 0 in the TIM1_ETR register), the CEN, DIR, and UG bits behave as control bits and can be changed only by software (except UG which remains cleared automatically). As soon as the CEN bit is written to 1, the prescaler is clocked by the internal clock. The figure below shows the behavior of the control circuit and the up-counter in normal mode, without the prescaler. Figure 44. Control circuit in normal mode, fCK_PSC = fMASTER 17.4.3 External clock source mode 1 The counter can count at each rising or falling edge on a selected timer input. This mode is selected when SMS = 111 in the TIM1_SMCR register (see Figure 45). Figure 45. TI2 external clock connection example |
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