Figure 100. Control Circuit In External Clock Mode 1; Figure 101. External Trigger Input Block - ST STM32F412 Reference Manual

Advanced arm-based 32-bit mcus

Table of Contents

Advanced-control timers (TIM1&TIM8)

Counter clock = CK_CNT = CK_PSC

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.

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

following procedure:

Figure 100. Control circuit in external clock mode 1

Counter register

gives an overview of the external trigger input block.

/1, /2, /4, /8

(internal clock)

RM0402 Rev 6

External clock

External clock

Internal clock

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