Figure 214. Control Circuit In External Clock Mode 1; Figure 215. External Trigger Input Block - ST STM32L4x6 Reference Manual

RM0351 Advanced-control timers (TIM1/TIM8)

Figure 214. Control circuit in external clock mode 1

External clock source mode 2
This mode is selected by writing ECE=1 in the TIMx_SMCR register.
The counter can count at each rising or falling edge on the external trigger input ETR.
The Figure 215 gives an overview of the external trigger input block.

Figure 215. External trigger input block

For example, to configure the upcounter to count each 2 rising edges on ETR, use the
following procedure:
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