pwm input mode low frequncy

hi

i work with stm32f107

pleas answer me

how i can measure frequency in 50 hz with input pwm

i read about it and find out i can measure frequency with input pwm up to 1100
but input pwm have TIM_ICPrescaler that i think devide pwm frequncy

it is true ?

if no , please say me how i can measure 50 hz?

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