Figure 72. Control Circuit In External Clock Mode 1; Figure 73. External Trigger Input Block - ST STM32F410 Reference Manual

Advanced-control timers (TIM1)
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.
Figure 73
For example, to configure the upcounter to count each 2 rising edges on ETR, use the
following procedure:
286/771

Figure 72. Control circuit in external clock mode 1

gives an overview of the external trigger input block.

Figure 73. External trigger input block

RM0401 Rev 3
RM0401