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STM32W108HB 데이터시트(PDF) 91 Page - STMicroelectronics

부품명 STM32W108HB
상세설명  High-performance, IEEE 802.15.4 wireless system-on-chip
PDF  179 Pages
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제조업체  STMICROELECTRONICS [STMicroelectronics]
홈페이지  http://www.st.com
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STM32W108HB 데이터시트(HTML) 91 Page - STMicroelectronics

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STM32W108CB, STM32W108HB
General-purpose timers
Doc ID 16252 Rev 2
91/179
Figure 24 gives an overview of the external trigger input block.
Figure 24.
External trigger input block
For example, to configure the up-counter to count each 2 rising edges on ETR, use the
following procedure:
●
As no filter is needed in this example, write TIM_ETF = 0000 in the TIMx_SMCR
register.
●
Set the prescaler by writing TIM_ETPS = 01 in the TIMx_SMCR register.
●
Select rising edge detection on ETR by writing TIM_ETP = 0 in the TIMx_SMCR
register.
●
Enable external clock mode 2 by writing TIM_ECE = 1 in the TIMx_SMCR register.
●
Enable the counter by writing TIM_CEN = 1 in the TIMx_CR1 register.
The counter counts once each 2 ETR rising edges.
The delay between the rising edge on ETR and the actual clock of the counter is due to the
resynchronization circuit on the ETRP signal.
Figure 25.
Control circuit in external clock mode 2
8.1.4
Capture/compare channels
Each capture/compare channel is built around a capture/compare register including a
shadow register, an input stage for capture with digital filter, multiplexing and prescaler, and
an output stage with comparator and output control.



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