General-purpose timers (TIM15/16/17) RM0351
942/1693 DocID024597 Rev 3
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 CK_INT.
Figure 309 shows the behavior of the control circuit and the upcounter in normal mode,
without prescaler.
Figure 309. Control circuit in normal mode, internal clock divided by 1
External clock source mode 1
This mode is selected when SMS=111 in the TIMx_SMCR register. The counter can count at
each rising or falling edge on a selected input.
Figure 310. TI2 external clock connection example
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