Clock Selection; Figure 68. Control Circuit In Normal Mode, Internal Clock Divided By 1; Figure 116. Ti2 External Clock Connection Example - ST STM32F102 Series Reference Manual

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Advanced-control timers (TIM1&TIM8)

Clock selection

The counter clock can be provided by the following clock sources:

Internal clock (CK_INT)

External clock mode1: external input pin

External clock mode2: external trigger input ETR

Internal trigger inputs (ITRx): using one timer as prescaler for another timer, for

example, you can configure Timer 1 to act as a prescaler for Timer 2. Refer to

Using one timer as prescaler for another timer on page 308

Internal clock source (CK_INT)

If the slave mode controller is disabled (SMS=000), then the CEN, DIR (in the TIMx_CR1

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.

without prescaler.

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 69. TI2 external clock connection example

shows the behavior of the control circuit and the upcounter in normal mode,

Internal clock

Counter clock = CK_CNT = CK_PSC

Counter register

TI2F_Falling

32 33 34 35 36

(internal clock)

for more details.

01 02 03 04 05 06 07

external clock

external clock

internal clock

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